Shaft Generator / PTO

Fault	Cause	Consequence
Bearing wear	Misalignment with the shaft line or vibration from the main engine	Progressive vibration, eventual insulation damage in the windings
Converter cooling fan failure	Dust ingress or bearing seizure in the fan motor	Frequency converter trips under load, generator drops off the board
Out-of-phase paralleling attempt	Faulty synchroscope or operator error	Severe mechanical and electrical shock, potential damage to generator and switchboard
Clutch slip	Worn friction plates or low engagement pressure	Loss of drive to the generator without an obvious alarm, output silently drops

Caterpillar / MaK

15

C7.1 Marine Generator Set

Per ship electrical load analysis · 150.0 kW · Diesel/MDO/MGO · 4-stroke medium-speed diesel

Engine Model

C7.1

Cylinders

6

Configuration

inline

Displacement (l)

7.01

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MDO
MGO

Application

marine generator set

Common Failures & Inspection Points

Aftercooler fouling causing high charge-air temperature
Injector wear causing hard starting and smoke
Raw-water pump seal leakage on seawater-cooled installations

Service: Follow Caterpillar marine maintenance schedule. Typical routine service includes engine oil and filter change around 250-500 operating hours depending on duty and oil analysis; valve lash inspection at scheduled interval; cooling system and aftercooler inspection periodically.

Spare Parts: Keep oil filters, fuel filters, seawater pump impeller or kit, belts, thermostat, injector sealing kits and starter/alternator spares depending on vessel redundancy.

Strengths

Proven reliability of the C7.1 platform with extensive global service support
Flexible fuel capability (diesel, MDO, MGO) simplifies bunker management
Integrated shaft‑generator/PTO design reduces installation space and weight compared to separate units
Relatively simple maintenance schedule (oil change every 250–500 h) and easy access to service points
Good power density for a medium‑speed engine, suitable for a wide range of auxiliary loads

Weaknesses

Aftercooler fouling can raise charge‑air temperature and reduce efficiency if not regularly inspected
Injector wear may cause hard starts and smoke emission in high‑hour applications
Raw‑water pump seal leakage is reported on seawater‑cooled installations, requiring periodic checks
Fixed 1500 rpm speed limits compatibility with variable‑speed drives or low‑speed propulsion concepts
Overall weight and footprint are higher than newer low‑emission, high‑speed genset families

Typical Vessels: Container shipBulk carrierProduct tankerCrude oil tankerOffshore supply vesselCruise linerRo‑Ro ferry

Decision Guide: Choose if you need a robust, widely supported medium‑speed generator with shaft/PTO capability and flexible fuel options for auxiliary power on mid‑size to large vessels. Avoid if space, weight or emissions limits are critical, or if you prefer a variable‑speed or low‑emission engine family.

Use Cases: Commonly installed as main auxiliary generators, emergency power sources, or shaft‑driven electrical generation on commercial cargo ships, tankers and offshore support vessels where reliable, continuous power is required for hotel loads, cargo handling equipment, and safety systems.

Datasheet

C9.3 Marine Generator Set

Per ship electrical load analysis · 250.0 kW · Diesel/MDO/MGO · inline 6‑cylinder diesel generator set

Engine Model

C9.3

Cylinders

6

Configuration

inline

Displacement (l)

9.3

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MDO
MGO

Application

marine generator set

Common Failures & Inspection Points

Fuel injector wear causing uneven exhaust temperatures
Turbocharger fouling from prolonged low-load operation
Heat exchanger fouling causing high jacket-water temperature

Service: Routine maintenance normally includes oil, fuel filter and coolant checks at manufacturer-defined hour intervals; avoid prolonged low-load running and perform load checks under operating conditions.

Spare Parts: Recommended onboard spares include filter sets, belts, seawater pump kit, injector seals, sensors and starter motor for critical applications.

Strengths

Compact footprint for a 9.3 L engine, ideal for space‑constrained installations
Three approved fuel types (diesel, MDO, MGO) give operational flexibility
Widely supported global service network and proven Caterpillar reliability
Integrated control system with load monitoring simplifies operation
High power density enables sufficient output on medium‑size vessels

Weaknesses

Injector wear can cause uneven exhaust temperatures if not monitored
Turbocharger fouling is common during prolonged low‑load periods
Heat‑exchanger fouling may raise jacket‑water temperature, requiring frequent cleaning
Emissions are higher than newer low‑speed or hybrid gensets
Fixed 1500 rpm speed may need gear reduction for some shaft‑driven applications

Typical Vessels: Container shipBulk carrierTankerOffshore supply vesselCruise linerFerryFishing vessel

Certifications: IMO D-2ABS

Decision Guide: Choose if: you need a compact, proven auxiliary power unit with flexible fuel options and strong after‑sales support; the installation can accommodate a fixed‑speed (1500 rpm) engine and you can maintain regular load cycles to avoid low‑load fouling. Avoid if: ultra‑low emissions are mandatory, the genset will operate at very low loads for extended periods, or space/weight constraints exceed what a 6‑cylinder unit can provide.

Use Cases: Typically installed as shaft‑driven generators on container and bulk carriers to supply hotel load, or as PTO‑driven units on offshore supply vessels for emergency power. Also used on cruise ships and ferries where reliable auxiliary electricity is critical and fuel flexibility is advantageous.

Datasheet

C18 ACERT Marine Generator Set

Per ship electrical load analysis · 550.0 kW · Diesel/MDO/MGO · medium-speed diesel engine

Engine Model

C18 ACERT

Cylinders

6

Configuration

inline

Displacement (l)

18.1

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MDO
MGO

Application

marine generator set

Common Failures & Inspection Points

Charge-air cooler fouling causing high exhaust temperature
Injector tip deposits after poor fuel quality
Turbocharger turbine fouling after extended low-load operation

Service: Operate periodically at sufficient load to reduce wet stacking. Carry out oil and filter changes, valve adjustment and aftercooler inspection according to Caterpillar marine service schedule.

Spare Parts: Keep fuel injectors or injector kits according to criticality, filter sets, turbocharger service kit, seawater pump kit, belts and key electronic sensors.

Strengths

Proven reliability and extensive global Caterpillar service network
Flexible fuel capability (diesel, MDO, MGO) simplifies bunkering logistics
ACERT combustion technology delivers lower emissions and better fuel efficiency than earlier C18 versions
Compact power density for 1.5‑2 MW output makes it suitable for a range of auxiliary applications
Can be driven directly from the main shaft (shaft generator) or via PTO, offering integration flexibility

Weaknesses

Higher specific fuel consumption compared with larger low‑speed engines when operated at light loads
Susceptible to charge‑air cooler fouling and turbocharger turbine deposits if run for long periods at low load (wet stacking)
Requires regular periodic loading and strict maintenance schedule to avoid injector tip deposits
Initial capital cost is relatively high for the power rating
Physical size may be limiting on very small vessels or where space is premium

Typical Vessels: Offshore supply vesselPlatform support vesselCruise ship (hotel load)Container ship auxiliaryTanker auxiliaryFerryLNG carrier (auxiliary power)

Certifications: IMO Type Approval (Marine Auxiliary Machinery)USCG Type ApprovalABS ClassificationDNV GL Certification

Decision Guide: Choose if you need a dependable medium‑speed diesel generator with flexible fuel options, good power density and the ability to be shaft‑driven for integrated propulsion systems. Avoid if the vessel operates predominantly at very low loads, requires ultra‑low emissions dual‑fuel capability, or has severe space/weight constraints.

Use Cases: Typically installed as auxiliary power on offshore support vessels, cruise ships, container carriers and tankers to run hotel services, cargo pumps, navigation equipment and emergency systems. Also used as shaft generators on vessels where propulsion shaft power can be harvested for electricity generation.

Datasheet

C32 ACERT Marine Generator Set

Per ship electrical load analysis · 940.0 kW · Diesel/MDO/MGO · mid-speed diesel generator

Engine Model

C32 ACERT

Cylinders

12

Configuration

V

Displacement (l)

32.1

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MDO
MGO

Application

marine generator set

Common Failures & Inspection Points

Injector wear causing cylinder imbalance
Turbocharger fouling under low-load operation
Cooling package fouling causing derating or shutdown

Service: Follow Caterpillar planned maintenance. Typical shipboard practice includes daily level and leak checks, periodic load testing, oil sampling and scheduled valve lash and injector inspection.

Spare Parts: Keep full filter service kits, seawater pump components, belts, sensors, starter spares and selected injector components where vessel redundancy is limited.

Strengths

Proven Caterpillar reliability with a global service network
ACERT combustion system meets IMO Tier II emission limits without after‑treatment
Flexible fuel options (diesel, MDO, MGO) for diverse operating regions
Compact power density compared with low‑speed engines of similar output
Integrated control and monitoring package simplifies load testing and diagnostics

Weaknesses

Higher specific fuel consumption than larger low‑speed gensets at full load
Injector wear and turbocharger fouling are known maintenance concerns under low‑load cycles
Initial capital cost is relatively high versus some competing mid‑speed units
Noise and vibration levels require careful mounting on smaller vessels
Weight and footprint may limit installation in space‑constrained ships

Typical Vessels: Container shipCruise linerOffshore supply vesselFerryNaval auxiliaryLNG carrier (hotel load)Shore‑based power plant for ports

Decision Guide: Choose if you need a reliable, mid‑speed diesel genset around 1–2 MW with built‑in IMO Tier II emissions compliance, flexible fuel use and strong OEM support. Avoid if vessel design favours low‑speed high‑efficiency engines, has severe space or weight limits, or prioritises the lowest upfront cost.

Use Cases: Commonly installed as auxiliary power on large merchant vessels for hotel services, emergency generators on cruise ships, continuous power supply for offshore platforms, and as shore‑based backup generation at ports where emissions compliance is required.

Datasheet

3508B Marine Generator Set

Per ship electrical load analysis · 968.0 kW · Diesel/MDO · medium-speed diesel generator

discontinued

Engine Model

3508B

Cylinders

8

Configuration

V

Displacement (l)

34.5

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MDO

Application

marine generator set

Common Failures & Inspection Points

Cylinder head cracking or valve seat wear in high-hour engines
Turbocharger fouling and bearing wear
Fuel nozzle wear causing high exhaust temperature spread

Service: Daily checks include oil pressure, jacket-water temperature and exhaust temperature spread. Major component inspection is normally planned by running hours and condition monitoring, with oil analysis strongly recommended.

Spare Parts: Maintain filters, fuel nozzles, injector components, exhaust manifold gaskets, turbocharger kits, water pump kits and selected cylinder head spares for remote operation.

Strengths

Proven Caterpillar reliability with a worldwide service network
Flexible fuel capability – can operate on marine diesel oil (MDO) or standard diesel
Compact V‑8 layout provides high power density for its class
Integrated condition monitoring and recommended oil analysis support predictive maintenance
Fast start‑up and good load acceptance due to 1500 rpm design

Weaknesses

Cylinder head cracking and valve seat wear reported in high‑hour engines
Turbocharger fouling and bearing wear can increase maintenance intervals
Fuel nozzle wear may cause uneven exhaust temperature spread, requiring close monitoring
Higher specific fuel consumption compared with newer low‑speed or dual‑fuel gensets
Physical size and weight may be limiting on vessels with tight engine‑room space

Typical Vessels: Container ShipBulk CarrierTankerOffshore Supply VesselCruise Ship

Certifications: IMO Type ApprovalUSCG Type ApprovalDNV GL

Decision Guide: Choose the 3508B when you need a proven, medium‑speed diesel genset with strong OEM support and flexible fuel options for auxiliary power. Avoid it if space is at a premium, or if ultra‑low emissions (IMO Tier III) or maximum fuel efficiency are top priorities.

Use Cases: The 3508B is typically installed as an auxiliary generator on merchant vessels to supply hotel loads, emergency power, and sometimes dynamic positioning support. It is favored on ships that value Caterpillar's service network and need a robust engine capable of handling variable load profiles over long voyages.

Datasheet

3512B Marine Generator Set

Per ship electrical load analysis · 1360.0 kW · Diesel/MDO · Medium-speed V12 diesel generator set

discontinued

Engine Model

3512B

Cylinders

12

Configuration

V

Displacement (l)

51.8

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MDO

Application

marine generator set

Common Failures & Inspection Points

Injector and nozzle wear causing exhaust temperature deviation
Aftercooler fouling or leakage
Turbocharger fouling and oil leakage at high running hours

Service: Use oil analysis and exhaust temperature trending. Scheduled maintenance includes oil and filter service, valve lash checks, fuel system checks and cooling system cleaning at manufacturer-defined intervals.

Spare Parts: Keep service kits, filters, nozzle sets, gaskets, turbocharger cartridge or overhaul kit, jacket-water pump kit and critical sensors.

Strengths

High power density and proven reliability for long‑haul operations
Dual‑fuel flexibility (diesel and marine diesel oil) reduces fuel logistics constraints
Robust support network; extensive service documentation and spare parts availability
Integrated control system with built‑in diagnostics for condition monitoring
Designed for shaft‑generator or PTO applications, simplifying installation on propulsion shafts

Weaknesses

Relatively heavy and bulky compared to high‑speed gensets, impacting space‑critical vessels
Injector/nozzle wear can cause exhaust temperature drift if not monitored closely
Aftercooler and turbocharger fouling are common at high operating hours, requiring periodic cleaning
Fixed 1500 rpm may need reduction gearing for some shaft‑driven configurations
Higher upfront capital cost than smaller, low‑power alternatives

Typical Vessels: Container shipsBulk carriersTankersCruise linersOffshore supply vesselsNaval auxiliariesFerries

Decision Guide: Choose if you need a reliable, medium‑speed generator with shaft‑driven capability and dual‑fuel flexibility on large commercial or offshore vessels. Avoid if vessel weight/space is at a premium, if ultra‑low emissions (e.g., LNG) are required, or if a lower‑cost, high‑speed genset would meet the power demand.

Use Cases: The 3512B is typically installed as the main auxiliary generator on large cargo carriers and cruise ships, providing continuous shipboard power and emergency backup. It is also used in shaft‑generator arrangements where propulsion shafts drive electrical generation for propulsion or hotel loads, and in offshore support vessels that require robust, dual‑fuel capable power plants.

Datasheet

3516B Marine Generator Set

Per ship electrical load analysis · 1825.0 kW · Diesel/MDO · V16 medium-speed diesel generator

discontinued

Engine Model

3516B

Cylinders

16

Configuration

V

Displacement (l)

69.0

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MDO

Application

marine generator set

Common Failures & Inspection Points

Fuel nozzle wear leading to high exhaust temperatures
Charge-air cooler fouling
Turbocharger bearing and seal wear in high-hour service

Service: Plan maintenance by Caterpillar hour schedule and condition monitoring. For standby units, run monthly load tests and avoid continuous light-load operation.

Spare Parts: Critical spares include fuel nozzles, filters, gaskets, jacket-water and seawater pump kits, turbocharger service parts and engine control sensors.

Strengths

Proven, high‑reliability design with extensive global Caterpillar support network
Fuel flexibility – runs on marine diesel oil or MDO
Good part‑load efficiency suitable for auxiliary and standby power
Modular construction simplifies installation and major overhauls
Integrated control system compatible with most ship automation platforms

Weaknesses

Large physical footprint and weight compared with compact high‑speed units
Higher specific fuel consumption at very low loads; continuous light‑load operation discouraged
Turbocharger bearing and seal wear become critical after high‑hour service
Charge‑air cooler fouling can raise exhaust temperatures if not monitored
Initial capital cost higher than some competing medium‑speed generators

Typical Vessels: Container shipBulk carrierTankerCruise linerOffshore supply vesselGeneral cargo ship

Certifications: ABSDNV GL

Decision Guide: Choose if you need a reliable mid‑size shaft‑driven generator with proven Caterpillar service support, fuel flexibility and good part‑load efficiency. Avoid if the vessel operates predominantly at very low loads, has strict space/weight constraints, or if lower upfront cost is the primary driver.

Use Cases: Commonly installed as the main auxiliary power source on large container and bulk carriers, as a shaft‑driven standby generator on tankers, and as part of the integrated power plant on cruise ships and offshore supply vessels where robust, long‑life operation is required.

Datasheet

Caterpillar 3508 Marine Generator Set

· Medium-speed V‑type diesel

Model Number

3508 GenSet

Strengths

High power density suitable for large commercial vessels
Proven reliability with extensive global support network
Flexible installation as shaft generator or PTO‑driven auxiliary set
Integrated control system simplifies monitoring and load management
Meets IMO Tier 2/3 emission standards

Weaknesses

Large physical footprint and weight compared with smaller gensets
Higher upfront capital cost than low‑speed alternatives
Requires regular medium‑speed engine maintenance (oil changes, inspections)
Noise and vibration levels higher than low‑speed or hybrid solutions
May need additional cooling equipment for maximum power ratings

Typical Vessels: Container shipBulk carrierTankerCruise linerOffshore supply vesselFerryNaval auxiliary

Certifications: IMO Type ApprovalABS ClassificationDNV GL Classification

Decision Guide: Choose if you need a robust, high‑output shaft generator for large commercial vessels with proven service support and compliance with IMO Tier 2/3 emissions. Avoid if vessel space is limited, you require ultra‑low emissions beyond Tier 3, or you prefer a lower‑speed or hybrid power solution.

Use Cases: The 3508 GenSet is typically installed on the main propulsion shaft to generate ship service power while underway, or driven via PTO for auxiliary power generation in port and emergency situations. It supplies hotel loads, navigation equipment, and can serve as standby power on vessels with high electrical demand.

Datasheet

Caterpillar 3512 Marine Generator Set

· medium-speed diesel generator

Model Number

3512 GenSet

Strengths

High power output (up to ~2.5 MW) in a compact footprint for medium‑speed engines
Caterpillar’s proven reliability and extensive service network worldwide
Flexible installation options – can be mounted as a shaft‑generator or PTO‑driven genset
Meets IMO MARPOL Annex VI Tier II (and with after‑treatment, Tier III) emission standards
Built‑in remote monitoring and control via Caterpillar’s Marine Power Management System

Weaknesses

Larger physical size compared with low‑speed or smaller genset alternatives
Higher capital cost than basic diesel generators of similar rating
Requires skilled personnel for routine maintenance and emission‑control system upkeep
Fuel efficiency drops at very low load factors, making it less ideal for vessels with highly variable power demand
May need additional after‑treatment (SCR or DPF) to achieve strict Tier III compliance in some jurisdictions

Typical Vessels: Container shipBulk carrierTankerCruise linerLNG carrier

Certifications: ABSDNV‑GLIMO MARPOL Annex VI Tier II

Decision Guide: Choose the Caterpillar 3512 when you need a high‑output, reliable genset that can be integrated with the main propulsion shaft or PTO and must meet modern emission standards. Avoid if vessel space is extremely limited, budget constraints preclude higher upfront cost, or the operating profile involves prolonged low‑load periods where fuel efficiency is critical.

Use Cases: The 3512 GenSet is commonly installed on large merchant vessels as a shaft‑generator to recover propulsion power for hotel loads, or as a PTO‑driven auxiliary genset on cruise ships and LNG carriers where redundancy and compliance with stringent emission rules are mandatory. It also serves in offshore supply vessels that require both high peak power and flexible operation.

Datasheet

Caterpillar 3516 Marine Generator Set

· V16 diesel generator set

Model Number

3516 GenSet

Strengths

High power output (up to ~3 MW) in a compact footprint for its class
Proven reliability with >30 years of global service experience
Extensive Caterpillar dealer and parts network, simplifying maintenance
Flexibility to operate as shaft‑generator or PTO‑driven unit
Meets IMO Tier III/ EPA Tier 3 emissions when equipped with after‑treatment

Weaknesses

Relatively large size and weight compared with newer low‑speed engines
Higher specific fuel consumption than some modern alternatives
Noise and vibration levels require additional mitigation on passenger vessels
Emissions compliance may need extra after‑treatment equipment, adding cost
Initial capital cost is higher than basic medium‑speed gensets

Typical Vessels: Container shipBulk carrierTankerCruise linerOffshore supply vesselFerry

Certifications: ABSDNV‑GLIMO Type Approval

Decision Guide: Choose if you need a high‑output, proven generator with global support and the flexibility to be installed as a shaft or PTO unit. Avoid if vessel space, weight limits, or ultra‑low emissions without additional after‑treatment are primary constraints.

Use Cases: Typically deployed as auxiliary power for main propulsion shafts on large merchant vessels, providing hotel load, emergency power, and peak shaving; also used on cruise ships and offshore platforms where reliable high‑capacity electricity is critical.

Datasheet

Caterpillar C7.1 Marine Generator Set

· 4-stroke turbocharged diesel engine

Model Number

C7.1 GenSet

Strengths

High power density – delivers ~750 kW in a relatively small footprint suitable for shaft‑generator installations.
Proven reliability of Caterpillar C7.1 platform with extensive service network worldwide.
Integrated control and monitoring system simplifies operation and condition‑based maintenance.
Meets IMO Tier III emission standards when equipped with after‑treatment, reducing NOx output.
Flexible mounting options (direct shaft drive or PTO) for various vessel layouts.

Weaknesses

Requires regular oil changes and scheduled overhauls typical of high‑speed diesel engines.
Weight and size may be limiting on very small vessels or where space is extremely constrained.
Maximum continuous output (~750 kW) may be insufficient for large ships that need >1.5 MW auxiliary power.
Emission compliance can demand additional after‑treatment hardware, increasing cost and complexity.

Typical Vessels: Container ship (mid‑size)Bulk carrierProduct tankerOffshore supply vesselCruise ferry

Decision Guide: Choose if: you need a reliable, medium‑power shaft or PTO generator for vessels up to ~20 000 GT where space is limited and compliance with IMO Tier III emissions is required. Avoid if: the vessel demands very high auxiliary power (>1.5 MW), ultra‑light weight solutions, or you prefer low‑maintenance alternatives such as gas turbines or hybrid battery systems.

Use Cases: Commonly installed on container and bulk carriers to supply hotel loads while underway, driven directly from the main engine shaft for efficient power generation. Also used on offshore support vessels as a PTO‑driven emergency generator when the main propulsion plant is offline.

Datasheet

Caterpillar C9.3 Marine Generator Set

· medium‑speed diesel genset

Model Number

C9.3 GenSet

Strengths

High power density in a compact footprint compared with larger low‑speed engines
Broad global service network and parts availability from Caterpillar
Flexibility to install as shaft generator or PTO, fitting many vessel layouts
Meets IMO Tier II emissions out of the box; Tier III achievable with after‑treatment
Robust construction designed for continuous marine operation

Weaknesses

Higher fuel consumption per kW than modern low‑speed engines when operating at full load
Initial capital cost is relatively high for a medium‑size genset
Weight and mounting requirements can be limiting on smaller vessels
Noise and vibration levels are greater than some newer, ultra‑low‑vibration designs
Limited modularity – upgrades usually require full engine replacement

Typical Vessels: Offshore supply vesselFerryCruise ship auxiliary powerContainer ship (auxiliary)Tanker (auxiliary)TugboatFishing vessel with high‑power needs

Certifications: ABSDNV GLLloyd's RegisterIMO Tier II (standard), Tier III optional

Decision Guide: Choose if you need a proven, high‑output auxiliary power source with flexible shaft/PTO installation and want the backing of Caterpillar’s global support network. Avoid if your priority is ultra‑low fuel consumption at partial loads, strict noise limits, or you require a low‑speed engine for maximum efficiency on very large vessels.

Use Cases: The C9.3 is typically deployed as an auxiliary generator on offshore supply ships and ferries, providing main hotel power and emergency backup. It is also used as a shaft‑generator on vessels where the propulsion gear can drive the genset to recover energy or supply shipboard loads while underway.

Datasheet

Caterpillar C18 Marine Generator Set

· V8 diesel shaft generator

Model Number

C18 GenSet

Strengths

Proven Caterpillar reliability with extensive global service network
Compact V8 design delivers high power density for shaft‑generator applications
Integrated control system simplifies monitoring and load management
Optional emissions after‑treatment (SCR) enables IMO Tier III compliance
Common parts across the C18 product line reduce spares inventory

Weaknesses

Higher upfront cost compared with many Asian‑manufactured gensets
Relatively heavy for its power rating, affecting shaft load calculations
Requires dedicated cooling and exhaust routing on the shaft line
Limited flexibility for low‑speed operation without additional gearing
Emissions after‑treatment adds complexity if Tier III compliance is required

Typical Vessels: Container shipBulk carrierTankerCruise linerOffshore supply vesselFerry

Certifications: ABS Type ApprovalDNV GL Classification

Decision Guide: Choose if: you need a high‑reliability, shaft‑driven power source with integrated control and the ability to meet IMO Tier III emissions when equipped with after‑treatment. Avoid if: budget constraints are paramount, vessel space is extremely limited, or a lighter‑weight generator set is preferred for low‑shaft loads.

Use Cases: The C18 genset is typically installed on large merchant vessels to generate ship service power while underway, serve as an emergency backup source, and support hotel load demands on cruise ships or offshore supply vessels. It is also used in dynamic positioning setups where shaft‑derived electricity supplements other diesel generators for redundancy.

Datasheet

Caterpillar C32 Marine Generator Set

· V12 diesel shaft generator

Model Number

C32 GenSet

Strengths

Proven reliability of the Caterpillar C32 engine platform with extensive global support
Integrated shaft‑driven design reduces need for separate auxiliary engines and saves space
High power output (up to ~2 MW) suitable for large vessel hotel loads
Flexibility to operate as a continuous shaft generator or on‑demand PTO unit
Can be equipped with IMO Tier III after‑treatment packages for low emissions

Weaknesses

Higher fuel consumption compared with newer low‑speed two‑stroke gensets of similar rating
Physical size and weight may limit installation on retrofits or smaller vessels
Initial capital cost is relatively high due to the robust Caterpillar package
Noise and vibration levels require additional mitigation measures in passenger ships
Emission compliance beyond Tier III requires optional after‑treatment, adding complexity

Typical Vessels: Container shipCrude oil tankerProduct tankerLNG carrierCruise linerOffshore supply vessel

Decision Guide: Choose if: the vessel already uses a Caterpillar main engine or compatible gearbox, requires high continuous power for hotel loads, and values a single‑source support network. Avoid if: space is at a premium, the ship seeks the lowest possible fuel consumption per kW, or the design calls for low‑speed two‑stroke gensets with inherent higher efficiency.

Use Cases: Commonly installed on new builds to supply all hotel power while underway, allowing the main engine to run at optimal load and reducing auxiliary diesel usage. Also used as emergency backup power on cruise ships and large tankers where a shaft‑driven source provides redundancy without extra engines.

Datasheet

Caterpillar C175-16 Marine Generator Set

· high‑speed four‑stroke diesel

Model Number

C175-16 GenSet

Strengths

High power density – delivers several megawatts from a relatively compact footprint
Proven Caterpillar global service network and parts availability
Flexible installation as shaft‑driven generator or PTO for auxiliary drives
Designed to meet IMO Tier II/III emission limits with optional after‑treatment
Robust construction suitable for continuous operation on long voyages

Weaknesses

Higher fuel consumption at part load compared with low‑speed engines
Larger weight and space requirements than smaller gensets
Requires high‑quality marine diesel fuel to avoid injector wear
Maintenance intervals are shorter than those of low‑speed, heavy‑fuel engines

Typical Vessels: Very Large Crude Carrier (VLCC)Container ship (>8,000 TEU)Cruise linerOffshore supply vesselLNG carrier

Decision Guide: Choose if: you need megawatt‑class electrical power on a large vessel, want the reliability and service support of Caterpillar, and can accommodate the engine’s size and fuel requirements. Avoid if: vessel space or weight is limited, low‑speed fuel efficiency is a priority, or you prefer an engine certified for heavy‑fuel oil without additional emission kits.

Use Cases: Commonly installed as a shaft generator on large tankers and container ships to supply hotel load while the main propulsion engine runs, reducing diesel generator usage. In PTO mode it drives high‑power auxiliaries such as deck pumps, compressors, or winches on offshore support vessels.

Datasheet

Cummins

8

6BT5.9-DM Marine Generator Set

Per ship electrical load analysis · 92.0 kW · Diesel/MDO/MGO · inline low-speed diesel generator

discontinued

Engine Model

6BT5.9-DM

Cylinders

6

Configuration

inline

Displacement (l)

5.9

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MDO
MGO

Application

marine generator drive

Common Failures & Inspection Points

Raw-water pump impeller damage
Injector pump leakage or governor instability on older units
Heat exchanger fouling causing overheating

Service: Routine service normally includes oil and filter change around 250 hours, fuel filter replacement, belt inspection and cooling circuit inspection. Load-test periodically.

Spare Parts: Keep fuel filters, oil filters, impeller kit, belts, thermostat, injector pipes and starter motor where single generator redundancy is limited.

Strengths

Proven reliability with decades of service in marine applications
Compact size and relatively low weight for its power class
Wide fuel compatibility (diesel, MDO, MGO)
Direct‑coupled to the main shaft at 1500 rpm eliminates need for reduction gearing
Simple mechanical design facilitates routine maintenance

Weaknesses

Older engine architecture results in higher specific fuel consumption versus modern electronic units
Raw‑water pump impeller wear is a common maintenance issue
Injector pump leakage and governor instability can develop on aging sets
Heat‑exchanger fouling may cause overheating if not cleaned regularly
Maximum power output is limited compared with newer high‑speed generator sets of similar footprint

Typical Vessels: Coastal cargo vesselOffshore supply vesselFerrySmall tankerFishing vesselYacht

Decision Guide: Choose if you need a rugged, low‑speed generator set that can be driven directly from the main shaft and you value ease of maintenance and fuel flexibility. Avoid if your project demands the lowest possible specific fuel consumption, modern electronic engine control, or compliance with the latest emission tiers without additional after‑treatment.

Use Cases: Typically installed as a shaft‑driven auxiliary generator on medium‑size merchant ships, providing emergency power and supporting hotel loads while underway; also used in PTO configurations for winches, compressors, or other deck machinery on offshore support vessels.

Datasheet

6CTA8.3-DM Marine Generator Set

Per ship electrical load analysis · 175.0 kW · Diesel/MDO/MGO · diesel shaft-driven generator

discontinued

Engine Model

6CTA8.3-DM

Cylinders

6

Configuration

inline

Displacement (l)

8.3

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MDO
MGO

Application

marine generator drive

Common Failures & Inspection Points

Aftercooler fouling causing high exhaust temperature
Turbocharger oil leakage after high-hour service
Fuel injector wear causing smoke and rough running

Service: Daily checks include oil, coolant, leaks and exhaust temperature. Perform oil/filter and fuel filter service at Cummins recommended intervals; inspect aftercooler and heat exchanger periodically.

Spare Parts: Recommended spares include filters, impeller kit, belts, injector seals, thermostats and turbocharger gasket kit.

Strengths

Proven medium‑speed Cummins design with high torque at 1500 rpm, suitable for direct PTO drive
Multi‑fuel capability (Diesel, MDO, MGO) gives operational flexibility on mixed‑fuel vessels
Compact inline six‑cylinder layout reduces engine room footprint compared with larger V‑type units
Integrated aftercooler improves exhaust temperature control and overall efficiency when clean
Wide service network and readily available spare parts worldwide

Weaknesses

Aftercooler fouling can raise exhaust temperatures, requiring frequent inspection in dusty or high‑sulphur fuel environments
Turbocharger oil leakage has been reported after high‑hour service intervals, increasing maintenance workload
Fuel injector wear may cause smoke and rough running if fuel quality is inconsistent
Limited output (≈750 kVA) makes it unsuitable for very large vessels that need >1 MW auxiliary power
Requires diligent daily monitoring of oil, coolant and exhaust temperature to avoid premature failures

Typical Vessels: Offshore supply vesselFerry / Ro‑RoCoastal cargo shipMedium‑size tugFishing factory vessel

Decision Guide: Choose if you need a compact, medium‑speed diesel generator with multi‑fuel flexibility for vessels up to about 1 MW auxiliary load and have access to regular maintenance. Avoid if the ship requires higher power output, ultra‑low emissions without after‑treatment, or operates in environments where aftercooler fouling cannot be managed.

Use Cases: The 6CTA8.3-DM is commonly installed on offshore supply ships and coastal ferries where space is at a premium but reliable 750 kVA power is required for navigation, hotel services and cargo handling equipment. It also appears on medium‑size tugs and fishing factory vessels that benefit from its fuel flexibility and proven Cummins service support.

Datasheet

QSB7-DM Marine Generator Set

Per ship electrical load analysis · 195.0 kW · Diesel/MGO · inline 6‑cylinder diesel generator

Engine Model

QSB7-DM

Cylinders

6

Configuration

inline

Displacement (l)

6.7

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MGO

Application

marine generator drive

Common Failures & Inspection Points

Electronic sensor faults causing alarms or derating
Seawater pump seal leakage
Injector fouling after contaminated fuel

Service: Follow Cummins marine maintenance schedule. Regular oil sampling, filter changes and seawater circuit checks are recommended; run at adequate load to avoid wet stacking.

Spare Parts: Keep ECM sensors, filters, belts, seawater pump kit, injector seals and common electrical spares.

Strengths

Dual‑fuel operation (diesel & marine gas oil) provides fuel flexibility and helps meet emission regulations.
Compact footprint and proven Cummins service network simplify installation and maintenance on a wide range of vessels.
Robust design with high reliability; well suited for continuous load operation at 1500 rpm, 50 Hz.
Integrated electronic control system enables remote monitoring and quick fault diagnostics.

Weaknesses

Maximum power output (~400‑500 kW) may be insufficient for larger vessels requiring higher auxiliary capacity.
Known issues with electronic sensors can trigger false alarms or require derating if not properly maintained.
Seawater pump seal leakage has been reported, necessitating regular inspection of the cooling circuit.
Fuel consumption is higher than that of low‑speed main propulsion engines, impacting operating cost on long voyages.

Typical Vessels: Product TankerBulk CarrierContainer ShipOffshore Supply VesselCruise Ship (hotel load)

Certifications: ABSDNV GL

Decision Guide: Choose if: you need a reliable 400‑500 kW auxiliary generator with dual‑fuel flexibility, have existing Cummins support, and operate vessels where space is limited. Avoid if: the required power exceeds 600 kW, you prefer low‑speed high‑efficiency main propulsion engines, or you cannot accommodate the known sensor/seal maintenance requirements.

Use Cases: Typically installed as a shaft‑driven auxiliary generator on merchant ships to supply hotel services, emergency power, and deck machinery; also used in offshore support vessels where fuel flexibility and quick start‑up are valued.

Datasheet

QSL9-DM Marine Generator Set

Per ship electrical load analysis · 264.0 kW · Diesel/MGO · Medium-speed diesel shaft generator

Engine Model

QSL9-DM

Cylinders

6

Configuration

inline

Displacement (l)

8.9

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MGO

Application

marine generator drive

Common Failures & Inspection Points

Charge-air cooler fouling
Injector leakage or poor spray pattern
Cooling circuit fouling causing high temperature trips

Service: Perform scheduled oil, filter and valve train service according to Cummins manual. Periodic load-bank testing is recommended for standby or lightly loaded units.

Spare Parts: Keep filters, belts, pump service kits, coolant hoses, injector seals, sensors and starter motor spares.

Strengths

Compact inline design fits well in limited engine‑room spaces.
Dual‑fuel capability (diesel and MGO) offers flexibility on vessels with mixed fuel strategies.
Proven reliability of Cummins QSL series with long service intervals for oil, filter and valve train.
Six‑cylinder balance provides low vibration, beneficial for passenger comfort on cruise ships and ferries.

Weaknesses

Charge‑air cooler fouling is a common issue in high‑particulate environments.
Injector leakage or poor spray pattern can lead to increased fuel consumption and emissions.
Cooling circuit fouling may cause high‑temperature trips, requiring vigilant maintenance.
Fixed 1500 rpm speed may necessitate reduction gearing on some propulsion arrangements.

Typical Vessels: Container shipBulk carrierTankerCruise linerOffshore supply vessel

Certifications: ABSDNV GL

Decision Guide: Choose if you need a compact, dual‑fuel shaft generator with Cummins’ service network and proven medium‑speed reliability on vessels where space is at a premium. Avoid if the operating profile involves heavy soot‑laden fuels that accelerate charge‑air cooler fouling, or if ultra‑low emissions (Tier III) are mandatory without after‑treatment.

Use Cases: Typically installed as an auxiliary generator driven directly from the main propulsion shaft on tankers, container ships and cruise vessels, providing continuous electrical power for hotel loads and emergency systems. Also used as standby generators on ferries and offshore supply ships where a reliable PTO‑driven set is preferred over separate diesel gensets.

Datasheet

QSM11-DM Marine Generator Set

Per ship electrical load analysis · 317.0 kW · Diesel/MGO · medium-speed diesel shaft generator

Engine Model

QSM11-DM

Cylinders

6

Configuration

inline

Displacement (l)

10.8

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MGO

Application

marine generator drive

Common Failures & Inspection Points

Injector wear causing misfire and exhaust temperature spread
Turbocharger fouling from low-load operation
Heat exchanger scaling in seawater service

Service: Use trend monitoring for exhaust temperatures and oil analysis. Conduct oil/filter changes and valve adjustment according to Cummins marine schedule.

Spare Parts: Recommended spares include filter sets, injector seals, seawater pump kits, belts, sensors and turbocharger gasket sets.

Strengths

Compact inline design fits well in limited engine‑room spaces
Dual‑fuel capability (diesel/MGO) offers operational flexibility
Integrated with main‑propulsion shaft, reducing auxiliary fuel consumption
Well‑established Cummins global support and parts network
Proven reliability for 1 MW‑class power generation in marine service

Weaknesses

Higher specific fuel consumption than low‑speed generators of similar output
Turbocharger fouling can occur during prolonged low‑load periods
Injector wear leading to misfire and uneven exhaust temperatures has been reported
Heat‑exchanger scaling is common in seawater cooling applications, requiring regular cleaning
Maximum power rating limited to the medium‑speed class (not suitable for >2 MW needs)

Typical Vessels: Container shipBulk carrierProduct tankerCruise linerOffshore supply vessel

Certifications: IMO Type Approval

Decision Guide: Choose if you need a proven medium‑speed shaft generator with moderate power output, dual‑fuel flexibility and strong OEM support for vessels up to about 1 MW electrical demand. Avoid if the ship requires very high power (>2 MW), ultra‑low fuel consumption low‑speed engines, or operates predominantly at low loads where turbocharger fouling becomes a concern.

Use Cases: Typically installed on the main engine shaft of ocean‑going cargo and passenger vessels to generate electricity while underway, and can also be driven via PTO for port‑side power generation or emergency backup.

Datasheet

KTA19-DM Marine Generator Set

Per ship electrical load analysis · 448.0 kW · Diesel/MDO · medium-speed diesel engine

Engine Model

KTA19-DM

Cylinders

6

Configuration

inline

Displacement (l)

19.0

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MDO

Application

marine generator drive

Common Failures & Inspection Points

Injector and PT fuel system wear causing unstable load sharing
Turbocharger fouling and oil leakage
Liner cavitation risk if coolant treatment is neglected

Service: Maintain coolant treatment and carry out oil analysis. Scheduled maintenance includes oil/filter service, valve and injector setting, turbocharger inspection and cooling system checks.

Spare Parts: Keep PT fuel system service parts, injector sets, filter kits, coolant treatment chemicals, water pump kit and turbocharger service kit.

Strengths

Proven reliability with worldwide parts support
Dual‑fuel capability (diesel and MDO) offers fuel flexibility
Integrated electronic control system simplifies start‑up and monitoring
Compact power density for a ~1.5 MW output at 1500 rpm
Meets IMO Tier 2 emission limits without after‑treatment

Weaknesses

Requires regular coolant treatment; liner cavitation risk if neglected
Injector and PT fuel system wear can cause uneven load sharing
Turbocharger fouling and oil leakage are common maintenance items
Medium‑speed engine is heavier and bulkier than high‑speed gensets
Direct 1500 rpm drive may need reduction gearing for some shaft‑generator layouts

Typical Vessels: Container shipBulk carrierTankerFerryOffshore supply vesselCruise ship auxiliary power

Certifications: IMO Type ApprovalDNV

Decision Guide: Choose if you need a robust, medium‑speed generator set with dual‑fuel flexibility and direct shaft drive for vessels that already have reduction gear. Avoid if space/weight are at a premium, or if you prefer a high‑speed genset with faster start‑up and lower envelope weight.

Use Cases: Commonly installed as auxiliary power generators on merchant ships, emergency power units on ferries, and shaft‑driven generators on offshore support vessels where reliable continuous operation is required.

Datasheet

KTA38-DM Marine Generator Set

Per ship electrical load analysis · 880.0 kW · Diesel/MDO · Medium-speed V12 diesel shaft generator

Engine Model

KTA38-DM

Cylinders

12

Configuration

V

Displacement (l)

37.8

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MDO

Application

marine generator drive

Common Failures & Inspection Points

Cylinder head gasket leakage on high-hour units
Turbocharger fouling from poor combustion
Fuel injector wear causing high exhaust temperature deviation

Service: Daily checks should include crankcase oil level, coolant, fuel leaks and exhaust temperature spread. Follow Cummins schedule for valve/injector setting and major overhaul planning.

Spare Parts: Carry filters, injector components, cylinder head gaskets, water pump repair kit, turbocharger kit and critical sensors.

Strengths

Proven reliability with decades of service on commercial vessels
Dual‑fuel capability (diesel and MDO) offers fuel flexibility
Compact V‑configuration fits within limited shaft space
Integrated generator set reduces overall plant footprint
Global Cummins support network simplifies spare‑parts logistics

Weaknesses

Known issues: cylinder head gasket leakage, turbocharger fouling, injector wear leading to high exhaust temperature spread
Higher specific fuel consumption than low‑speed or hybrid alternatives
Requires regular oil, coolant and exhaust temperature monitoring
Weight and dimensions are larger than newer compact modular gensets
Fixed 1500 rpm speed may need reduction gearing for some propulsion arrangements

Typical Vessels: Container shipBulk carrierProduct tankerCruise linerOffshore supply vessel

Certifications: IMO Type ApprovalABSDNV

Decision Guide: Choose if you need a medium‑speed, dual‑fuel shaft generator with an established service record and worldwide Cummins support. Avoid if ultra‑low fuel consumption, minimal weight, or the latest low‑emission technology are top priorities.

Use Cases: Installed on the main propulsion line as a PTO to generate electricity while underway, providing auxiliary power for hotel loads, cargo handling equipment, and emergency systems; also used in port to supply shipboard load without running the main engine.

Datasheet

KTA50-DM Marine Generator Set

Per ship electrical load analysis · 1100.0 kW · Diesel/MDO · V‑type medium-speed diesel generator set

Engine Model

KTA50-DM

Cylinders

16

Configuration

V

Displacement (l)

50.3

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MDO

Application

marine generator drive

Common Failures & Inspection Points

Injector wear causing exhaust temperature spread
Turbocharger seal leakage
Cooling system fouling causing high jacket-water temperature

Service: Plan oil sampling and valve/injector setting by running hours. Avoid prolonged low-load running; perform load tests and cooling system cleaning periodically.

Spare Parts: Recommended spares include filter sets, injector and PT pump service parts, turbocharger kits, water pump kit, gaskets and sensors.

Strengths

High power density for its 50 L displacement, ideal for shaft‑generator integration
Proven reliability with robust turbocharger and fuel system design
Dual‑fuel capability (diesel and MDO) offers bunker flexibility
Matches common 1500 rpm main engine speeds, simplifying mechanical coupling
Extensive Cummins global support network and parts availability

Weaknesses

Injector wear can cause exhaust temperature spread and reduced efficiency
Turbocharger seal leakage reported in field service bulletins
Cooling system fouling leads to high jacket‑water temperatures if not cleaned regularly
Prolonged low‑load operation accelerates component wear; load management required
Large physical size may limit installation on smaller vessels

Typical Vessels: Container ShipBulk CarrierTankerRo-Ro FerryCruise Ship

Certifications: IMO Type Approval (D‑2)

Decision Guide: Choose if you need a high‑power, medium‑speed diesel generator that can be directly coupled to a 1500 rpm shaft for auxiliary or emergency power on large merchant vessels and you value Cummins worldwide support. Avoid if the vessel operates predominantly at low loads, has limited space for a large engine, or if you cannot commit to regular injector and cooling‑system maintenance.

Use Cases: Commonly installed as a shaft‑generator on container ships, bulk carriers, tankers and cruise vessels to supply hotel load, provide emergency power, or recover propulsion energy via a PTO arrangement. It is also used in retrofit projects where existing main engine speed matches the generator's operating speed.

Datasheet

MTU

5

Series 60 Marine Generator Set

Per ship electrical load analysis · 300.0 kW · Diesel/MGO · medium-speed diesel engine

discontinued

Engine Model

MTU Series 60

Cylinders

6

Configuration

inline

Displacement (l)

14.0

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MGO

Application

marine generator set

Common Failures & Inspection Points

Injector and electronic control faults on high-hour units
Turbocharger fouling
Cooling system fouling causing high temperature alarms

Service: Follow MTU maintenance schedule. Regular service includes oil and filter changes, valve adjustment, coolant checks and periodic load testing.

Spare Parts: Keep filter kits, injector seals, sensors, belts, water pump components and starter motor spares.

Strengths

High power density in a compact footprint, suitable for shaft‑generator installations
Dual‑fuel capability (diesel and marine gas oil) gives operational flexibility
Proven track record on cruise ships, ferries and offshore vessels with extensive service network
Integrated electronic control system enables precise load management and quick start‑up
Meets IMO MARPOL Tier II emission limits without additional after‑treatment

Weaknesses

Injector and ECU faults become more common on high‑hour units, requiring periodic diagnostics
Turbocharger fouling can lead to reduced performance if fuel quality is poor or maintenance lapses
Cooling system fouling may trigger high‑temperature alarms, demanding regular coolant checks
Maintenance intensity higher than newer low‑speed or gas‑turbine alternatives
Weight and vibration levels are greater than those of modern compact gensets

Typical Vessels: Cruise shipFerryOffshore supply vesselContainer ship (auxiliary power)Tanker (emergency/auxiliary generator)

Certifications: DNVABS

Decision Guide: Choose if you need a reliable medium‑speed shaft‑generator with dual‑fuel flexibility and an established service network. Avoid if ultra‑low emissions Tier III compliance in Emission Control Areas is mandatory without after‑treatment, or if you prefer a lower‑maintenance low‑speed or gas‑turbine solution.

Use Cases: Typically installed on the main propulsion shaft of ferries to generate shipboard electricity, as an auxiliary generator on cruise ships for hotel load, and as emergency power on tankers and offshore vessels where space is limited but high output is required.

Datasheet

12V 2000 M41A Marine Generator Set

Per ship electrical load analysis · 760.0 kW · Diesel/MGO · Medium-speed V12 diesel generator

Engine Model

12V 2000 M41A

Cylinders

12

Configuration

V

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MGO

Application

marine generator set

Common Failures & Inspection Points

Injector faults causing rough running
Charge-air cooler fouling
Coolant leakage at hose and gasket joints

Service: Follow MTU running-hour service plan. Routine maintenance includes oil and filter service, valve clearance checks, coolant testing and electronic diagnostics.

Spare Parts: Keep MTU filter kits, sensors, belts, injector sealing kits, coolant hoses and starter motor spares.

Strengths

High power density – delivers around 1.5‑2 MW in a compact footprint
Dual‑fuel capability (diesel/MGO) provides operational flexibility
Proven MTU reliability with extensive global service network
Integrated electronic control system enables quick start‑up and load management
Meets modern emission standards (Euro III/IV) without major after‑treatment

Weaknesses

Injector wear can cause rough running if not serviced regularly
Charge‑air cooler fouling is a known issue in dusty or high‑humidity environments
Requires diligent coolant system maintenance to prevent hose and gasket leaks
Higher initial capital cost compared with smaller gensets
Fixed 1500 rpm speed may need reduction gearing for some shaft‑generator applications

Typical Vessels: Container shipBulk carrierProduct tankerCruise linerOffshore supply vesselFerry

Decision Guide: Choose if: you need a medium‑speed, high‑output shaft generator or PTO with dual‑fuel flexibility and want the backing of MTU's global support network. Avoid if: space is extremely limited, you prefer low‑speed engines for fuel efficiency, or you require a lower upfront cost solution.

Use Cases: Commonly installed as a main auxiliary generator on container ships and bulk carriers, as a shaft‑driven emergency power source on tankers, and as a PTO‑driven hotel load generator on cruise vessels and offshore supply ships.

Datasheet

16V 2000 M41A Marine Generator Set

Per ship electrical load analysis · 1000.0 kW · Diesel/MGO · Medium-speed diesel engine

Engine Model

16V 2000 M41A

Cylinders

16

Configuration

V

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MGO

Application

marine generator set

Common Failures & Inspection Points

Turbocharger fouling after light-load service
Injector wear causing cylinder imbalance
Sensor faults causing alarm or derating

Service: Carry out oil/filter service and ECU diagnostics according to MTU intervals. Avoid extended no-load or very low-load operation.

Spare Parts: Recommended spares include filter sets, injector seals, coolant hoses, belts, turbocharger gaskets and electronic sensors.

Strengths

High power density from a compact V‑16 layout
Proven MTU control system with built‑in diagnostics
Dual fuel capability (diesel or marine gas oil) for flexibility
Widely accepted type approval by major classification societies

Weaknesses

Turbocharger prone to fouling under prolonged low‑load operation
Injector wear can cause cylinder imbalance if maintenance is lax
Higher specific fuel consumption compared with newer low‑speed engines
Larger footprint than some modern high‑efficiency gensets

Typical Vessels: Container shipCruise linerOffshore supply vesselFerryNaval auxiliary

Certifications: IMO Type ApprovalDNV GLABS

Decision Guide: Choose if you need a robust, medium‑speed generator with proven service history for shaft‑generator or PTO use on vessels that run at moderate to high loads. Avoid if the vessel will operate predominantly at very low load or requires Tier III emissions compliance where newer low‑speed or hybrid solutions are more suitable.

Use Cases: Commonly installed as a shaft‑driven generator on large merchant ships and offshore vessels, providing main auxiliary power for hotel services, emergency generators, and supplemental propulsion support.

Datasheet

12V 4000 M23S Marine Generator Set

Per ship electrical load analysis · 1650.0 kW · Diesel/MGO · medium-speed diesel generator

Engine Model

12V 4000 M23S

Cylinders

12

Configuration

V

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MGO

Application

marine generator set

Common Failures & Inspection Points

Injector faults causing exhaust temperature deviation
Turbocharger fouling
Charge-air cooler contamination

Service: Follow MTU service schedule with oil analysis, valve checks, filter changes and scheduled major component inspections.

Spare Parts: Keep filter kits, injector service parts, sensors, coolant pump parts, belts and turbocharger gasket sets.

Strengths

High power density in a compact V‑12 layout, ideal for integration on main engine shafts
Proven MTU reliability with extensive service network and diagnostic tools
Dual‑fuel capability (diesel & MGO) supports IMO fuel flexibility requirements
Integrated control system compatible with most ship automation platforms
Standardized parts across the 4000 series simplify spares management

Weaknesses

Injector and turbocharger wear reported at high load cycles, requiring vigilant maintenance
Fuel consumption rises noticeably at low loads compared with newer low‑speed gensets
Fixed 1500 rpm may need reduction gearing on vessels with slower main engine speeds
Higher initial capital cost relative to some competing medium‑speed units

Typical Vessels: Container shipsCruise linersRo‑Ro ferriesOffshore supply vesselsBulk carriers

Certifications: IMO Type ApprovalDNV GL Classification

Decision Guide: Choose if: you need a compact, high‑output shaft generator for a vessel with a main engine running at or near 1500 rpm and require dual‑fuel flexibility. Avoid if: the ship operates primarily at low electrical loads, has strict fuel‑efficiency targets, or uses a slower‑speed propulsion system that would add costly reduction gearing.

Use Cases: The 12V 4000 M23S is typically installed on large merchant vessels where auxiliary power can be taken directly from the main engine shaft, such as cruise ships and container carriers, providing continuous shipboard electricity while reducing separate diesel generator fuel consumption during cruising.

Datasheet

16V 4000 M23S Marine Generator Set

Per ship electrical load analysis · 2200.0 kW · Diesel/MGO · V‑type four‑stroke diesel generator set

Engine Model

16V 4000 M23S

Cylinders

16

Configuration

V

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MGO

Application

marine generator set

Common Failures & Inspection Points

Turbocharger fouling under low-load profile
Injector wear causing uneven cylinder load
Cooling system fouling causing high temperature derating

Service: Use MTU service schedule and diagnostics. Routine maintenance includes oil/filter changes, coolant testing, valve checks and periodic load-bank testing.

Spare Parts: Recommended spares include MTU filter kits, injector seals, sensors, starter spares, cooling pump kit and turbocharger service parts.

Strengths

High power density from a compact 16‑cylinder V configuration
Dual‑fuel capability (diesel and MGO) for operational flexibility
Proven MTU reliability with extensive global service network
Integrated shaft‑generator design reduces auxiliary space on board
Meets modern emission standards (Euro VI/IMO Tier III compatible)

Weaknesses

Turbocharger fouling under prolonged low‑load operation requires careful load management
Injector wear can lead to uneven cylinder loading if not monitored regularly
Cooling system fouling may cause temperature derating, increasing fuel consumption
Higher initial capital cost compared with some lower‑power competitors
Requires strict adherence to MTU service intervals for optimal lifespan

Typical Vessels: Container shipsBulk carriersTankers (product and chemical)Cruise vesselsOffshore support vessels

Certifications: IMO Type Approval

Decision Guide: Choose if: you need a high‑output, compact generator for shaft‑generator or PTO use on medium to large vessels, require dual‑fuel flexibility, and value MTU's global after‑sales support. Avoid if: the vessel operates predominantly at very low loads for long periods (risk of turbo fouling) or budget constraints preclude the higher upfront cost.

Use Cases: Typically installed as a shaft generator on container ships and bulk carriers to supply shipboard power while underway, or as a PTO‑driven set on tankers and offshore vessels where space is limited and dual‑fuel operation enhances fuel‑cost optimisation.

Datasheet

John Deere

4

4045TFM85 Marine Generator Drive

Per ship electrical load analysis · 74.0 kW · Diesel/MGO · inline four‑stroke diesel

Engine Model

4045TFM85

Cylinders

4

Configuration

inline

Displacement (l)

4.5

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MGO

Application

marine generator drive

Common Failures & Inspection Points

Raw-water pump impeller failure
Injector fouling from contaminated fuel
Heat exchanger scaling

Service: Follow John Deere marine maintenance schedule. Routine service includes oil and filter changes, fuel filter service, belt inspection and cooling system checks.

Spare Parts: Keep oil and fuel filters, impeller kit, belts, thermostat, injector seals and starter spares.

Strengths

Compact size and low weight for its power class, easing installation in limited spaces
Fuel flexibility – can run on standard diesel or Marine Gas Oil (MGO)
Proven John Deere service network and spare‑parts availability worldwide
Low operating speed (1500 rpm) reduces wear on the generator coupling
Meets IMO Tier II emission standards in most configurations

Weaknesses

Maximum power output limited to ~250–300 kW, unsuitable for high‑power vessels
Known susceptibility to raw‑water pump impeller wear if cooling water is not properly filtered
Injector fouling can occur with contaminated fuel; requires diligent fuel filtration
Heat‑exchanger scaling in hard‑water regions demands regular cleaning
May require higher‑grade fuel to meet emission limits, increasing operating cost

Typical Vessels: Offshore supply vesselCoastal tankerContainer feederFerryWorkboat / tug auxiliary power

Certifications: IMO Tier IIUSCG Type ApprovalABS Marine Certification

Decision Guide: Choose if you need a compact, low‑speed diesel generator drive up to ~300 kW with good fuel flexibility and strong after‑sales support. Avoid if the vessel requires higher auxiliary power, operates on very poor‑quality fuel without robust filtration, or demands redundancy beyond a single engine set.

Use Cases: Typically installed as a shaft‑driven generator on medium‑size cargo ships, offshore supply vessels, and ferries to provide continuous auxiliary electricity for hotel loads, navigation systems, and emergency power. Also used in PTO configurations for hybrid propulsion arrangements where the engine can supplement or replace electric drive units.

Datasheet

6068AFM85 Marine Generator Drive

Per ship electrical load analysis · 150.0 kW · Diesel/MGO · medium-speed diesel engine

Engine Model

6068AFM85

Cylinders

6

Configuration

inline

Displacement (l)

6.8

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MGO

Application

marine generator drive

Common Failures & Inspection Points

Injector wear causing smoke
Turbocharger fouling
Cooling water pump leakage

Service: Carry out oil/filter service, fuel filter replacement and cooling system inspection according to John Deere intervals. Periodic load testing is recommended.

Spare Parts: Recommended spares include filters, impeller kit, belts, injectors or seals, thermostats and coolant hoses.

Strengths

Inline six‑cylinder layout gives smooth operation and low vibration
Dual‑fuel capability (diesel or marine gas oil) adds fuel flexibility
Well‑defined John Deere service intervals for oil, filters and cooling system
Robust PTO coupling simplifies integration with shaft generators
Extensive global parts and support network from John Deere

Weaknesses

Injector wear can lead to excess smoke if not monitored
Turbocharger fouling reported under prolonged low‑load operation
Cooling water pump leakage has been noted in field service reports
Emissions compliance may require additional after‑treatment for Tier III standards
Relatively large footprint compared with high‑speed genset packages

Typical Vessels: Container shipBulk carrierTankerGeneral cargo vesselOffshore supply vesselFerry

Certifications: IMO Type ApprovalDNV

Decision Guide: Choose if you need a proven, medium‑speed diesel engine with dual‑fuel flexibility and a strong service network for shaft‑driven generator sets. Avoid if space is at a premium, you require the latest low‑emission Tier III performance without extra after‑treatment, or you prefer a high‑speed compact genset.

Use Cases: The 6068AFM85 is typically installed on merchant vessels as an auxiliary power source, driving shaft generators for main propulsion support, hotel loads, and emergency power. It is also used on offshore platforms where reliable, dual‑fuel operation is valued.

Datasheet

6090AFM85 Marine Generator Drive

Per ship electrical load analysis · 242.0 kW · Diesel/MGO · inline 6‑cylinder low‑speed diesel generator drive

Engine Model

6090AFM85

Cylinders

6

Configuration

inline

Displacement (l)

9.0

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MGO

Application

marine generator drive

Common Failures & Inspection Points

Aftercooler fouling
Injector wear
Electronic sensor faults causing alarms

Service: Follow John Deere marine schedule. Routine checks include oil level, coolant, fuel leaks, exhaust temperature trend and periodic ECU diagnostics.

Spare Parts: Keep filters, belts, seawater pump kit, sensor spares, injector seals and thermostat kit.

Strengths

High power output (≈850 kW) in a compact shaft‑generator package
Dual‑fuel capability – runs on marine diesel oil or MGO, offering fuel flexibility
Integrated aftercooler and ECU provide efficient combustion and built‑in diagnostics
John Deere’s global service network ensures parts availability and technical support
Proven reliability in commercial shipping with a long service interval schedule

Weaknesses

Aftercooler fouling is common when operating on high‑sulphur or dirty fuels
Injector wear can require more frequent overhauls compared with some low‑speed engines
Electronic sensor faults may generate nuisance alarms and need ECU troubleshooting
Fixed 1500 rpm speed limits use to vessels that prefer lower RPM without reduction gearing
Initial capital cost is higher than generic OEM generator sets

Typical Vessels: Container ship (20‑30 k TEU)Bulk carrier (30‑50 k DWT)Product tankerOffshore supply vesselCruise liner auxiliary power

Certifications: IMO Type ApprovalDNV

Decision Guide: Choose if you need a high‑output, dual‑fuel shaft generator with strong OEM support and built‑in diagnostics. Avoid if your operation runs on very dirty fuel that accelerates aftercooler fouling or if you require a low‑maintenance engine without electronic sensor complexity.

Use Cases: The 6090AFM85 is typically installed as the main auxiliary generator on medium‑size commercial vessels where space is limited and a reliable PTO‑driven power source is required, such as container ships, bulk carriers, tankers and offshore supply vessels operating in regions with mixed fuel availability.

Datasheet

6135AFM85 Marine Generator Drive

Per ship electrical load analysis · 350.0 kW · Diesel/MGO · inline 6‑cylinder diesel generator drive

Engine Model

6135AFM85

Cylinders

6

Configuration

inline

Displacement (l)

13.5

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel
MGO

Application

marine generator drive

Common Failures & Inspection Points

Turbocharger fouling from light-load operation
Injector leakage or poor spray pattern
Cooling system fouling causing high temperature alarm

Service: Use periodic load testing and oil analysis. Follow John Deere intervals for oil/filter changes, valve lash checks and cooling system maintenance.

Spare Parts: Recommended spares include filter kits, belts, water pump kit, injector seals, sensors and turbocharger gasket kit.

Strengths

Proven John Deere reliability and extensive global service network
Compact inline layout fits tight engine rooms while delivering high torque at 1500 rpm
Dual‑fuel (diesel/MGO) operation provides fuel flexibility for compliance with emission zones
Integrated PTO simplifies shaft‑generator installation on new builds or retrofits

Weaknesses

Turbocharger prone to fouling when operated continuously at low load – requires careful load management
Injector wear or spray‑pattern issues reported, demanding regular oil analysis and injector checks
Cooling system can become fouled in warm sea water, leading to high‑temperature alarms if not maintained
Mid‑speed (1500 rpm) engines are generally less fuel‑efficient than modern low‑speed alternatives for very large vessels

Typical Vessels: Container shipBulk carrierTankerCruise linerOffshore supply vessel

Certifications: ABSDNV

Decision Guide: Choose if you need a reliable, mid‑speed shaft‑generator with dual‑fuel flexibility and a strong after‑sales network. Avoid if the vessel will operate predominantly at light loads (risk of turbo fouling) or if ultra‑low fuel consumption and emissions are top priorities, in which case a low‑speed or hybrid generator may be preferable.

Use Cases: Commonly installed as a PTO‑driven generator on large merchant ships to supply auxiliary power while the main engine is running, especially where space constraints favor an inline design. Also used in retrofits where existing propulsion shafts are leveraged for electrical generation without adding separate prime movers.

Datasheet

Wärtsilä

3

Wärtsilä Shaft Generator - economical electrical power generation

· Shaft-driven electrical generator (PTO)

Model Number

Wartsila Shaft Generator

Strengths

High overall efficiency by utilizing waste mechanical energy from the main engine
Compact installation directly on the shaft reduces space and weight compared with separate gensets
Integrated control system compatible with Wärtsilä propulsion packages for seamless operation
Proven reliability and long service life in a wide range of vessel classes

Weaknesses

Power output is tied to main engine speed, limiting flexibility during low‑speed operations
Requires precise alignment and regular bearing maintenance on the shaft line
Initial capital cost can be higher than a simple auxiliary diesel generator for small power needs
Limited redundancy if the main engine fails, unless paired with additional gensets

Typical Vessels: Container shipBulk carrierGeneral cargo vesselRo‑Ro / ferryOffshore supply vessel

Certifications: DNV GL classification approvalABS class approval

Decision Guide: Choose if: you need to improve fuel efficiency by harvesting shaft power, have limited engine room space, and operate vessels where the main engine runs at a relatively constant speed. Avoid if: your vessel requires high electrical output independent of propulsion speed, or you rely heavily on redundancy with multiple separate generators.

Use Cases: Wärtsilä shaft generators are commonly installed on newbuilds and retrofits to supply hotel loads, auxiliary systems, and occasional peak power demand while the main engine is underway. They are especially valued on vessels with long transits where fuel savings from waste‑heat recovery translate into significant operational cost reductions.

Datasheet

Generator Protection Module, GPM 500, Diesel Protection Module, DPM 500

· Generator protection module

Model Number

TAA00000F1

Strengths

Integrated with Wärtsilä engine control systems for coordinated response
DNV‑approved design ensures compliance with major classification societies
Compact, purpose‑built unit reduces wiring complexity compared to discrete relays
Provides comprehensive fault detection (overload, reverse power, frequency excursions)
Designed for easy retro‑fit on existing shaft generator installations up to 500 kW

Weaknesses

Limited to generators ≤ 500 kW; larger units require a different solution
Optimised for Wärtsilä engine interfaces – may need additional adapters for other makes
Higher upfront cost than basic electromechanical protection relays
Configuration software is proprietary, requiring Wärtsilä support for updates

Typical Vessels: Container shipCruise linerRo‑Ro ferryOffshore supply vesselLNG carrierGeneral cargo vessel

Certifications: DNV

Decision Guide: Choose if: you operate a Wärtsilä main engine with a shaft generator ≤ 500 kW and need DNV‑approved, integrated protection that covers overload, reverse power and frequency faults. Avoid if: the vessel uses non‑Wärtsilä engines, requires protection for generators above 500 kW, or budget constraints favour simple relay‑based solutions.

Use Cases: Typically installed on new builds or during retrofits where a shaft generator supplies hotel loads or auxiliary power. The module continuously monitors generator parameters and automatically isolates the generator in fault conditions, protecting both the generator set and the main engine while providing alarm signals to the ship’s control system.

Datasheet

Moss Inert Gas Generator System

· exhaust‑driven inert gas generator

IMO Approved

ja

Model Number

MEDB000013H

Strengths

Integrated with shaft‑PTO – lower fuel consumption than dedicated diesel IGG units
Compact footprint suitable for new‑build and retrofit tanker projects
Fully automated control system with real‑time monitoring and alarm functions
Class approved (DNV) and IMO D‑2 certified, ensuring regulatory compliance
Proven reliability on large crude and product tankers with long service intervals

Weaknesses

High capital cost compared with simple diesel‑driven IGG sets
Inert gas production drops at low main‑engine loads; auxiliary diesel may be needed for slow steaming
Requires space for water‑wash scrubber and soot filter maintenance
Complex integration work on existing vessels can extend dry‑dock periods
Dependence on main‑engine exhaust limits use on smaller tankers or non‑tankers

Typical Vessels: Crude oil tankerProduct tankerChemical tankerLPG carrier (larger units)Large bulk carriers with inert gas requirements

Certifications: IMO D-2DNV

Decision Guide: Choose if: the vessel is a medium‑to‑large tanker requiring continuous inert gas, space and fuel efficiency are priorities, and integration with the main engine is feasible. Avoid if: the ship operates frequently at low speed or idle, has limited installation space for scrubbers, or budget constraints make a simpler diesel IGG more attractive.

Use Cases: Commonly installed on new‑build crude oil tankers above 30 000 DWT and product carriers to replace older steam‑turbine IGG systems; also used in retrofits where owners seek lower operating costs and class‑approved inert gas compliance without adding a separate diesel generator.

Datasheet

ABB Marine

2

ABB AMG Marine Synchronous Generator

· Synchronous shaft generator

Model Number

AMG (Synchronous Generator)

Technical Specifications

Leistungsbereich LV: 14 kVA - 5000 kVA; Spannungen 380-690 V (50/60 Hz)
Leistungsbereich HV: bis 63 MVA; Spannungen bis 15 kV (50/60 Hz)
Rahmengroessen: LV: 180-630; HV: 500-2500; Pedestal: 1250-2500
Isolationssystem: VPI (Vakuum-Druck-Traenkung) Klasse H/F fuer Stator und Rotor
Wicklung: Polyester-Imid-Harz mit hoher Dielektrizitaets- und Feuchtebestaendigkeit
Kuehlung: Doppel-Axialventilatoren, Wasser-/Luftkuehlung moeglich; Umgebungsbereich -20°C bis +45°C, Hoehe bis 1000m
Lagerung: Sealed-for-life (Frame <400) oder nachfettbar (Frame 450); Pedallagerkonstruktion fuer groessere Frames
Avr-system: UNITROL 1000 Serie oder GEN06/GEN08 AVR; 100 kVA - 80 MVA; U/Hz, UEL, OEL Limiter
Schutzstandard: IEC 60034-18-32 fuer Isolationsalterung; IEEE Std 117-1974; Klassifizierungsgesellschaften zertifiziert

Product Lines

AMG Synchronous Generator Series (14 kVA - 2600 kVA LV; up to 63 MVA HV)
LV Standard Marine Generators (400-5000 kVA, Frame 400-630)
LV Modular Marine Generators (560-2400 kVA, Frame 400-450)
HV Pedestal Bearing Generators (up to 60 MVA, Frame 1250-2500)
Shaft Generators (Permanent Magnet, up to 4 MW)

Common Failures & Inspection Points

Area: Wicklungs-Isolationszustand verschlechtert durch Feuchte, Verschmutzung, thermisches Altern oder mechanische Beschaedigung
Check: Isolationswiderstand (IR)-Test mit Megohmmeter (Megger) durchfuehren: DC-Spannung ca. 500V zwischen Wicklung und Masse anwenden. Strom-Leckage messen. Mindestanforderungen nach maritimen Vorschriften: >2 MΩ (bis 5A); >1 MΩ (10A); >100 kΩ (100A); >25 kΩ (>200A). Messwerte auf 40°C normalisieren (IEEE 43-2013). Trend-Analyse ueber Zeit durchfuehren. AVR vor Pruefung abklemmen (DAR-Methode). Oberflaehe, Generator und Umgebung vor Test auf Trockenheit pruefen (maritime Feuchte).
Area: Wicklung durch Feuchte, Salzkorrosion, Vibration in maritimer Umgebung beschaedigt oder ermoedungsrissig
Check: Betriebszustand von Laengern und Lagerschalen visuell kontrollieren; Lagerschmierung und -temperatur prufen (D-Ende und N-Ende separat dokumentieren); Oberflaechentemperaturen mit Thermometer oder IR-Kamera messen. Betriebsvibration messen (mm/sec oder µm); abweichende Werte aufzeichnen. Bei Regreasing-Lagern Schmierfett nachfuellen gemaess Hersteller-Spezifikation. Dichtheit Lagerschilde gegen Salzwasser und Feuchte pruefen.
Area: Stator-Wicklung durch Alterung oder Feuchte-Eindringung durch mangelnde VPI-Qualitaet beschaedigt
Check: Visuelle Kontrolle Wicklung auf Risse, Brandflecken, Verfaerbungen, lose Anschuesse. Widerstandsmessung des Isolierstoffs durchfuehren. Tan-Delta & Kapazitaetsmessungen (Partial Discharge-Analyse) zur Erkennung von Laminations- oder Corona-Schaeden durchfuehren (ABB Ability LEAP Programm). Isolationssystem-Zustand (VPI-Traenkung) beurteilen. Messdauer ~4-6 Stunden.
Area: AVR (UNITROL 1000/GEN-Serie) fehlfunktion durch Feuchte, Salzkorrosion oder Alterung; Spannungsregelung fehlerhaft
Check: AVR-Einheiten visuell auf Korrosion, Feuchte-Eindringung, lose Kontakte prufen (Salzwasser-Umgebung). Spannungsausgang am AVR-Display oder Meter pruefen. Test-Programm AVR durchfuehren: Sollspannung verifizieren, Reaktion auf Lastaenderung prueben, UEL/OEL (Under-/Overexcitation Limiter) Funktion testen. Verdrahtung und Stecker auf Korrosion kontrollieren. Loesemittel-Reinigung wenn noetig. Ersatz-AVR-Unit sicherstellen.
Area: Kuehlung unzureichend: Luftstrom blockiert, Ventilator verschmutzt/beschaedigt, Wasser-Kuehlung undicht oder versalzt
Check: Ventilator-Blades auf Salzbelag, Korrosion, mechanische Beschaedigung pruefen. Luftkanaele und Kuehlflansche reinigen (Salzspray-Belaege entfernen). Wasser-Kuehler auf Undichtigkeiten, Korrosion, Mineralienanlagerungen prufen (bei Wasser-Kuehlvarianten). Temperaturerhoehung unter Betrieb messen: Statorwicklung U/T1, V/T2, W/T3; Lagerschalen D-Ende und N-Ende. Umgebungstemperatur dokumentieren. Sollte >5°C sein, Relative Feuchte <75%; Maschinentemperatur >= Taupunkt halten. Kuehlung vor Wiederinbetriebnahme freimachen.
Area: Kommissionierung fehlerhaft: Schrauben nicht korrekt angezogen, Kabelverbindungen undicht/korrosiert, Lager nicht gescmiert, Gesamtzustand nicht zertifiziert
Check: Befestigungsschrauben Drehmoment-Kontrolle durchfuehren (Hersteller-Spezifikation); lockern/umpositionieren wenn noetig. Stromkabel Verbindungen auf Sichtbarkeit Korrosion, lockerer Kontakt, Verformung prueben. Lagerschmierung vor Start verifizieren (Regreasable Bearings). Kommissionierungs-Bericht aus Annex 5 des AMG-Manuals konsultieren. Alle Einstellungen nochmals vor Ort ueberpruefen. Spannungs-/Strommessungen durchfuehren. Sicherheitseinrichtungen testen. Kommissionierungs-Test-Protokoll ausfuellen und signieren.

Typ-universelle Inspektions-/Wartungspunkte fuer Power Generation (ABB Marine, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths

Very broad power rating (14 kVA‑5 MVA LV, up to 63 MVA HV) covering most large vessel needs
VPI (vacuum pressure impregnation) insulation class H/F provides high moisture and corrosion resistance
Dual axial fan cooling allows air or water‑cooled operation in harsh marine climates
Integrated UNITROL/GEN AVR series with UEL/OEL limits for stable voltage regulation
Modular frame sizes (LV 180‑630, HV up to 2500) simplify installation and future upgrades

Weaknesses

Large physical footprint and weight at high power ratings can limit placement on smaller ships
Requires strict moisture control during commissioning; insulation degradation is a known failure mode
Complex bearing lubrication (sealed‑for‑life or re‑greasable) adds maintenance overhead for high‑frame units
Higher capital cost compared with conventional diesel generator sets of similar rating
Performance depends on shaft speed; vessels with low RPM main engines may need gear reduction

Typical Vessels: Very Large Crude Carriers (VLCC)Ultra‑Large Container ShipsCruise LinersLNG/LPG carriersOffshore Support VesselsHybrid propulsion vessels

Certifications: IEC 60034-18-32IEEE Std 117-1974DNV

Decision Guide: Choose if the vessel has a high‑power main engine shaft, needs reliable on‑shaft generation for propulsion or hotel load, and can accommodate the generator’s size and cooling requirements. Avoid if space is limited, the ship operates at low shaft speeds without gear reduction, or budget constraints favor conventional diesel generators.

Use Cases: Installed directly on the main propulsion shaft of large tankers, container ships, and cruise vessels to supply primary hotel power, support emergency generation, and enable load‑sharing with diesel gensets in hybrid propulsion schemes. Frequently used where a compact, high‑efficiency conversion of mechanical to electrical energy is required without adding separate prime movers.

Manufacturer Datasheet

Datasheet

ABB Marine Shaft Generator

· Shaft-driven synchronous generator

Model Number

Marine Shaft Generator

Technical Specifications

Leistungsbereich LV: 14 kVA - 5000 kVA; Spannungen 380-690 V (50/60 Hz)
Leistungsbereich HV: bis 63 MVA; Spannungen bis 15 kV (50/60 Hz)
Rahmengroessen: LV: 180-630; HV: 500-2500; Pedestal: 1250-2500
Isolationssystem: VPI (Vakuum-Druck-Traenkung) Klasse H/F fuer Stator und Rotor
Wicklung: Polyester-Imid-Harz mit hoher Dielektrizitaets- und Feuchtebestaendigkeit
Kuehlung: Doppel-Axialventilatoren, Wasser-/Luftkuehlung moeglich; Umgebungsbereich -20°C bis +45°C, Hoehe bis 1000m
Lagerung: Sealed-for-life (Frame <400) oder nachfettbar (Frame 450); Pedallagerkonstruktion fuer groessere Frames
Avr-system: UNITROL 1000 Serie oder GEN06/GEN08 AVR; 100 kVA - 80 MVA; U/Hz, UEL, OEL Limiter
Schutzstandard: IEC 60034-18-32 fuer Isolationsalterung; IEEE Std 117-1974; Klassifizierungsgesellschaften zertifiziert

Product Lines

AMG Synchronous Generator Series (14 kVA - 2600 kVA LV; up to 63 MVA HV)
LV Standard Marine Generators (400-5000 kVA, Frame 400-630)
LV Modular Marine Generators (560-2400 kVA, Frame 400-450)
HV Pedestal Bearing Generators (up to 60 MVA, Frame 1250-2500)
Shaft Generators (Permanent Magnet, up to 4 MW)

Common Failures & Inspection Points

Area: Wicklungs-Isolationszustand verschlechtert durch Feuchte, Verschmutzung, thermisches Altern oder mechanische Beschaedigung
Check: Isolationswiderstand (IR)-Test mit Megohmmeter (Megger) durchfuehren: DC-Spannung ca. 500V zwischen Wicklung und Masse anwenden. Strom-Leckage messen. Mindestanforderungen nach maritimen Vorschriften: >2 MΩ (bis 5A); >1 MΩ (10A); >100 kΩ (100A); >25 kΩ (>200A). Messwerte auf 40°C normalisieren (IEEE 43-2013). Trend-Analyse ueber Zeit durchfuehren. AVR vor Pruefung abklemmen (DAR-Methode). Oberflaehe, Generator und Umgebung vor Test auf Trockenheit pruefen (maritime Feuchte).
Area: Wicklung durch Feuchte, Salzkorrosion, Vibration in maritimer Umgebung beschaedigt oder ermoedungsrissig
Check: Betriebszustand von Laengern und Lagerschalen visuell kontrollieren; Lagerschmierung und -temperatur prufen (D-Ende und N-Ende separat dokumentieren); Oberflaechentemperaturen mit Thermometer oder IR-Kamera messen. Betriebsvibration messen (mm/sec oder µm); abweichende Werte aufzeichnen. Bei Regreasing-Lagern Schmierfett nachfuellen gemaess Hersteller-Spezifikation. Dichtheit Lagerschilde gegen Salzwasser und Feuchte pruefen.
Area: Stator-Wicklung durch Alterung oder Feuchte-Eindringung durch mangelnde VPI-Qualitaet beschaedigt
Check: Visuelle Kontrolle Wicklung auf Risse, Brandflecken, Verfaerbungen, lose Anschuesse. Widerstandsmessung des Isolierstoffs durchfuehren. Tan-Delta & Kapazitaetsmessungen (Partial Discharge-Analyse) zur Erkennung von Laminations- oder Corona-Schaeden durchfuehren (ABB Ability LEAP Programm). Isolationssystem-Zustand (VPI-Traenkung) beurteilen. Messdauer ~4-6 Stunden.
Area: AVR (UNITROL 1000/GEN-Serie) fehlfunktion durch Feuchte, Salzkorrosion oder Alterung; Spannungsregelung fehlerhaft
Check: AVR-Einheiten visuell auf Korrosion, Feuchte-Eindringung, lose Kontakte prufen (Salzwasser-Umgebung). Spannungsausgang am AVR-Display oder Meter pruefen. Test-Programm AVR durchfuehren: Sollspannung verifizieren, Reaktion auf Lastaenderung prueben, UEL/OEL (Under-/Overexcitation Limiter) Funktion testen. Verdrahtung und Stecker auf Korrosion kontrollieren. Loesemittel-Reinigung wenn noetig. Ersatz-AVR-Unit sicherstellen.
Area: Kuehlung unzureichend: Luftstrom blockiert, Ventilator verschmutzt/beschaedigt, Wasser-Kuehlung undicht oder versalzt
Check: Ventilator-Blades auf Salzbelag, Korrosion, mechanische Beschaedigung pruefen. Luftkanaele und Kuehlflansche reinigen (Salzspray-Belaege entfernen). Wasser-Kuehler auf Undichtigkeiten, Korrosion, Mineralienanlagerungen prufen (bei Wasser-Kuehlvarianten). Temperaturerhoehung unter Betrieb messen: Statorwicklung U/T1, V/T2, W/T3; Lagerschalen D-Ende und N-Ende. Umgebungstemperatur dokumentieren. Sollte >5°C sein, Relative Feuchte <75%; Maschinentemperatur >= Taupunkt halten. Kuehlung vor Wiederinbetriebnahme freimachen.
Area: Kommissionierung fehlerhaft: Schrauben nicht korrekt angezogen, Kabelverbindungen undicht/korrosiert, Lager nicht gescmiert, Gesamtzustand nicht zertifiziert
Check: Befestigungsschrauben Drehmoment-Kontrolle durchfuehren (Hersteller-Spezifikation); lockern/umpositionieren wenn noetig. Stromkabel Verbindungen auf Sichtbarkeit Korrosion, lockerer Kontakt, Verformung prueben. Lagerschmierung vor Start verifizieren (Regreasable Bearings). Kommissionierungs-Bericht aus Annex 5 des AMG-Manuals konsultieren. Alle Einstellungen nochmals vor Ort ueberpruefen. Spannungs-/Strommessungen durchfuehren. Sicherheitseinrichtungen testen. Kommissionierungs-Test-Protokoll ausfuellen und signieren.

Typ-universelle Inspektions-/Wartungspunkte fuer Power Generation (ABB Marine, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths

Very wide power range covering low‑voltage (380‑690 V) to high‑voltage (up to 15 kV) applications
Robust VPI vacuum pressure impregnation insulation system (Class H/F) for long life in marine environments
Sealed‑for‑life or greasable bearing designs reduce maintenance intervals
Dual axial fans with optional water cooling provide flexible thermal management
Integrated UNITROL/GEN AVR families give precise voltage regulation and protection

Weaknesses

Physical size and weight increase markedly for high‑power (≥1 MW) units, limiting installation space
Sensitive to moisture ingress; requires strict insulation testing and regular humidity control
Complex commissioning and alignment procedures demand experienced ABB service personnel
Higher upfront capital cost compared with conventional diesel gensets of similar rating
Maintenance of VPI‑based windings can be more demanding than simple cast‑resin designs

Typical Vessels: Container shipsBulk carriersTankers (crude, product)Cruise linersOffshore support vesselsLNG/LPG carriersNaval auxiliaries

Decision Guide: Choose if you need a reliable, shaft‑driven power source that can replace or supplement auxiliary diesel generators, especially on large ocean‑going ships where fuel savings and space efficiency are priorities. Avoid if the vessel lacks sufficient shaft space, operates in extreme temperatures outside –20 °C to +45 °C, or if budget constraints favor simpler genset solutions.

Use Cases: Providing hotel load power while underway, reducing auxiliary engine run‑time; supplying emergency power during main engine shutdown; supporting high‑power propulsion control systems on cruise and offshore vessels; enabling fuel‑efficient operation by generating electricity directly from the main engine shaft.

Manufacturer Datasheet

Datasheet

ABB Oy, Distribution Solutions

2

Feeder Protection REF615, Motor Protection REM615, Voltage Protection REU615, Line-differential Protection RED615 and Transformer Protection RET615, Generator and interconnection protection REG615 & Capacitator bank protection and control REV615

· Modular marine protection relays

Model Number

TAE000014Y

Strengths

Integrated suite covers all major protection functions on a single platform
Compact, rack‑mountable design saves space in engine rooms
Built‑in diagnostics and self‑test reduce maintenance downtime
IEC 61850/ IEC 60870‑5‑104 communication enables remote monitoring and integration with ship automation systems
Proven reliability on large commercial vessels with extensive DNV approval history

Weaknesses

Higher upfront cost compared with basic single‑function relays
Requires ABB‑specific configuration tools and trained personnel for commissioning
Firmware updates must be managed carefully to avoid compatibility issues
Limited interoperability with non‑ABB protection hardware
Physical size may still be large for very small vessels or yachts

Typical Vessels: Crude oil tankerContainer shipBulk carrierLNG/LPG carrierCruise linerOffshore supply vesselNaval auxiliary ship

Certifications: DNV GL ApprovalABS Classification (typical for ABB marine relays)IMO Type Approval (for protection equipment)

Decision Guide: Choose if: you need a comprehensive, integrated protection solution for multiple generator and transformer assets on a large commercial vessel, require remote diagnostics, and value proven DNV‑approved hardware. Avoid if: the vessel is small with limited budget, you already have an established non‑ABB protection ecosystem, or you lack access to ABB commissioning expertise.

Use Cases: Deployed in shipboard power plants to protect shaft generators driven by main engines, motor drives for auxiliary pumps, voltage regulation devices, transformer banks, generator interconnection schemes and capacitor bank installations. Typical on vessels with high‑power diesel or gas turbine generators where coordinated protection is critical for safety and reliability.

Datasheet

Feeder Protection REF630, Motor Protection REM630, Generator Protection REG630 and Transformer Protection RET630

· digital multifunction protection relay

Model Number

TAE000039T

Strengths

Modular IEC 61850/IEC 60255 compliant design enables easy integration with shipboard automation systems
Comprehensive protection functions (over‑/under‑current, differential, earth fault, over‑frequency, under‑voltage, etc.) in a single unit
Built‑in self‑test and diagnostics reduce maintenance time and improve reliability
Compact rack‑mount form factor saves space in engine rooms and switchboards
DNV‑approved (model TAE000039T) provides classification confidence for newbuilds

Weaknesses

Higher upfront cost compared with traditional electromechanical relays
Requires skilled commissioning and configuration to fully exploit advanced functions
Limited to the current/voltage ratings defined for each module; larger generators may need multiple units or higher‑rated series
Dependence on external power supply and communication network; loss of power or network can affect protection performance unless backup is provided

Typical Vessels: Cruise shipsContainer vesselsBulk carriersRo‑Ro / ferry vesselsOffshore support vesselsLNG/LPG carriers with shaft generators

Certifications: DNVIEC 61850IEC 60255

Decision Guide: Choose if you need a highly configurable, digitally networked protection solution for shaft‑generator or PTO applications and want classification approval (DNV). Avoid if the vessel has very limited budget, low power ratings that can be served by simpler electromechanical relays, or lacks the technical staff to program and maintain IEC 61850 devices.

Use Cases: Installed in engine rooms to protect shaft‑driven generators on cruise ships, provide motor protection for PTO‑driven winches on offshore supply vessels, safeguard transformer units in shipboard switchboards, and integrate with integrated bridge systems for remote monitoring and fault logging.

Datasheet

DEIF

2

Uni-line Generator controls

· Modular generator controller

Model Number

TAA00000Z2

Strengths

Fully integrated with DEIF Power Management System for seamless monitoring and control
Automatic load sharing and synchronization of multiple generators
Built‑in protection functions (over/under voltage, frequency, reverse power, etc.)
DNV approved design ensures compliance with classification societies
Remote diagnostics via DEIF e‑View platform

Weaknesses

Optimised for use with other DEIF equipment; mixed‑vendor installations may need additional interfacing
Higher upfront cost compared with basic stand‑alone controllers
Requires specialised training for commissioning and maintenance
Firmware updates must be managed to retain certification status

Typical Vessels: Container shipTankerBulk carrierCruise linerOffshore supply vesselLNG/LPG carrier

Certifications: DNV

Decision Guide: Choose if the vessel already uses DEIF power solutions or requires a highly reliable, DNV‑approved generator controller with advanced load‑sharing and remote monitoring. Avoid if budget constraints demand a lower‑cost basic controller or if the existing plant is built around a different vendor’s control architecture.

Use Cases: Commonly installed on newbuilds to provide efficient shaft‑generator operation for fuel‑saving, as well as retrofits replacing aging generator controls on tankers, container ships and offshore vessels where integrated monitoring and DNV compliance are required.

Datasheet

PPU-3, GPU-3 - Generator Controllers and Protection, PPM-3 - Power Management System

· Generator control and power management system

Model Number

TAA00000KD

Strengths

Modular architecture allows scaling from single to multiple generator sets.
Built‑in power management (PPM‑3) optimises load sharing and fuel efficiency.
Advanced fault diagnostics and remote monitoring reduce downtime.
IEC‑compatible communication interfaces enable integration with ship automation systems.
Proven reliability on a wide range of commercial vessels.

Weaknesses

Higher initial capital cost compared with basic generator controllers.
Requires DEIF‑specific software tools and trained personnel for commissioning.
Complex configuration may lengthen installation time on retrofit projects.
Limited to the voltage/frequency ranges supported by the PPU‑3/GPU‑3 hardware (exact limits not publicly disclosed).
Dependence on proprietary spare parts supply chain.

Typical Vessels: Crude oil tankerProduct tankerContainer shipBulk carrierOffshore supply vesselCruise liner

Decision Guide: Choose if you need a fully integrated, remotely monitorable controller for shaft or PTO generators on large commercial vessels and value advanced load‑sharing to minimise fuel consumption. Avoid if the vessel only requires a simple, low‑cost generator protection relay or if in‑house expertise with DEIF systems is lacking.

Use Cases: Deployed as the primary control unit for main‑engine driven shaft generators on tankers and bulk carriers, and for PTO‑driven auxiliary gensets on offshore supply ships where coordinated power management across multiple generators is required.

Datasheet

MacGregor

2

Twistlock CV-20 Forged Shaft, Twistlock CV-20L Lifting Forged Shaft

Per ship electrical load analysis · Electrical Power Generation · Forged steel shaft generator coupling

Common Failures & Inspection Points

Generatorwicklung-Isolationsdegradation
AVR Spannungsregler-Fehlfunktion
Kupplung Schwingungsdämpfer Verschleiß
Gleichstrommaschine Bürstenverschleiß

Service: Generator-Isolationstest jährlich. AVR-Kalibrierung jährlich. Kupplung-Inspektion alle 5 Jahre. Ölwechsel per Herstellerangabe.

Spare Parts: Ersatzteile über MacGregor Finland Oy oder zugelassene Vertriebspartner. Lead time: 2-6 Wochen.

Strengths

High tensile strength and fatigue resistance due to forged construction
Integrated lifting lugs on the CV‑20L version simplify handling and installation
Proven DNV approval ensures compliance with classification society standards
Modular design allows quick replacement or retrofit on existing propulsion lines
Low vibration transmission when correctly aligned, extending generator life

Weaknesses

Relatively heavy compared with aluminium or composite alternatives
Requires periodic visual inspection and alignment checks (recommended every 5 years)
Limited to the torque/power range for which the CV‑20 series is rated; not suitable for ultra‑high power ships
Specialized lifting equipment may be needed due to weight and geometry
Wear of coupling vibration dampers can lead to premature failure if not monitored

Typical Vessels: Container shipBulk carrierTankerCruise linerOffshore supply vessel

Certifications: DNV

Decision Guide: Choose if you need a robust, DNV‑approved forged shaft for medium‑power shaft‑generator or PTO applications and value easy handling with integrated lifting lugs. Avoid if the vessel requires ultra‑lightweight drive components, operates at power levels beyond the CV‑20 rating, or cannot accommodate the periodic inspection schedule.

Use Cases: The Twistlock CV‑20 shafts are typically installed on new builds or during retrofits where a shaft generator is added to provide auxiliary electrical power from the main engine. They are common on vessels that run long voyages and benefit from fuel‑saving shaft‑generator operation, as well as on offshore support ships that need reliable PTO drives for winches or compressors.

Datasheet

Twistlock CV-20G Forged Shaft, Twistlock CV-20G Lifting Forged Shaft

Per ship electrical load analysis · Electrical Power Generation · Shaft-driven auxiliary generator

Common Failures & Inspection Points

Generatorwicklung-Isolationsdegradation
AVR Spannungsregler-Fehlfunktion
Kupplung Schwingungsdämpfer Verschleiß
Gleichstrommaschine Bürstenverschleiß

Service: Generator-Isolationstest jährlich. AVR-Kalibrierung jährlich. Kupplung-Inspektion alle 5 Jahre. Ölwechsel per Herstellerangabe.

Spare Parts: Ersatzteile über MacGregor Finland Oy oder zugelassene Vertriebspartner. Lead time: 2-6 Wochen.

Strengths

Robust forged steel shaft provides high torque capacity and long service life
Integrated twist‑lock coupling simplifies installation and alignment on existing PTO shafts
DNV‑approved design gives confidence in classification compliance
Annual isolation test and AVR calibration are straightforward maintenance tasks
Eliminates need for separate diesel generator sets, reducing fuel consumption

Weaknesses

Requires a compatible main‑engine shaft line; not suitable for vessels without PTO capability
Coupling vibration damper wear can lead to increased maintenance intervals
AVR (voltage regulator) failures have been reported and need periodic calibration
Generator brush wear may necessitate more frequent inspections on high‑load ships
Weight and space requirements are higher than some compact electric motor alternatives

Typical Vessels: TankerBulk CarrierContainer ShipCruise VesselOffshore Supply Vessel

Certifications: DNV

Decision Guide: Choose if: the vessel already has a main‑engine PTO shaft and you want to generate hotel power directly from engine torque, reducing diesel genset fuel use and meeting emission targets. Avoid if: the ship lacks a compatible shaft line, prefers fully independent generator sets, or cannot accommodate the periodic coupling inspections.

Use Cases: The CV-20G is typically installed on large merchant vessels to supply hotel load while underway, providing an efficient alternative to diesel generators for continuous power and serving as backup power during engine outages. It is also used in retrofit projects where space for additional gensets is limited.

Datasheet

Northern Lights

2

M944W Marine Generator Set

Per ship electrical load analysis · 20.0 kW · Diesel · shaft‑driven medium‑speed diesel generator

Engine Model

M944W

Cylinders

4

Configuration

inline

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel

Application

marine generator set

Common Failures & Inspection Points

Raw-water pump impeller damage
Heat exchanger fouling
Fuel lift pump or injector wear on high-hour units

Service: Follow Northern Lights maintenance schedule. Routine tasks include oil/filter change, fuel filter change, impeller inspection and valve adjustment at specified hours.

Spare Parts: Keep impeller kit, filters, belts, zincs if fitted, thermostat, fuel lift pump and starter spares.

Strengths

Compact integration with shaft eliminates separate prime‑mover space requirements
Proven Northern Lights service network and parts availability worldwide
Medium‑speed diesel offers good fuel efficiency for moderate power demands
Standardized 1500 rpm design simplifies coupling to most marine gearboxes
Built‑in PTO capability allows direct mechanical drive of auxiliary equipment

Weaknesses

Raw‑water pump impeller is a known wear item requiring periodic inspection/replacement
Heat‑exchanger fouling can reduce cooling efficiency if water quality is poor
Fuel lift pump and injector wear become issues on high‑hour units, increasing maintenance cost
Limited to moderate power output; not suitable for very large vessels needing >500 kW auxiliary power
Requires regular oil, filter and valve adjustments per Northern Lights schedule

Typical Vessels: FerryOffshore supply vesselPatrol boatSmall cruise shipTugboat

Certifications: IMO D-2DNV

Decision Guide: Choose if you need a space‑saving, shaft‑driven generator with reliable medium‑speed diesel performance and have access to Northern Lights support. Avoid if the vessel requires high auxiliary power (>500 kW), prefers low‑speed engines for fuel economy, or cannot accommodate regular impeller/heat‑exchanger maintenance.

Use Cases: Commonly installed on vessels where a secondary source of electricity is required without sacrificing engine room volume—e.g., ferries that run frequent short trips, offshore supply ships needing redundant power for cargo handling gear, and patrol boats that benefit from direct PTO operation of winches or compressors.

Datasheet

M1066 Series Marine Generator Set

Per ship electrical load analysis · 80.0 kW · Diesel · inline diesel shaft generator

Engine Model

M1066

Cylinders

6

Configuration

inline

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel

Application

marine generator set

Common Failures & Inspection Points

Raw-water pump leakage
Heat exchanger scaling
Injector wear causing smoke

Service: Routine service includes oil/filter changes, fuel filters, belt checks, impeller replacement and valve adjustment according to Northern Lights schedule.

Spare Parts: Keep filters, impeller kit, belts, injectors or nozzles, thermostat, hoses and starter motor spares.

Strengths

Proven Northern Lights reliability with a global service network
Compact inline configuration fits tight engine rooms
Dual installation options (shaft‑driven or PTO) increase flexibility
1500 rpm, 50 Hz output matches standard ship electrical systems without extra gearing
Robust construction designed for marine diesel fuel

Weaknesses

Raw‑water pump leakage reported in service bulletins
Heat‑exchanger scaling can occur in hard‑water environments if not cleaned regularly
Injector wear may cause smoke and higher emissions when maintenance lapses
Power rating limited compared with larger 8‑cylinder models, may need multiple units for high demand vessels
Requires strict adherence to oil, filter and impeller service intervals

Typical Vessels: Bulk CarrierProduct TankerContainer ShipOffshore Supply VesselCruise Ferry

Certifications: IMO Type Approval

Decision Guide: Choose if you need a compact, reliable diesel generator with flexible shaft or PTO mounting for vessels up to medium auxiliary power demand and value Northern Lights after‑sales support. Avoid if your vessel requires very high single‑unit output (>1 MW) or cannot commit to the recommended maintenance schedule that mitigates known raw‑water pump and injector issues.

Use Cases: Commonly installed as an auxiliary generator on mid‑size merchant vessels for hotel loads, emergency power, and load‑sharing with main propulsion; also used on offshore supply ships where space is limited and a shaft‑driven unit can recover propeller rotation energy.

Datasheet

Solar Turbines

2

CENTAUR 40, 50 CS/MD & GENERATOR SET, TAURUS 60, 65, 70 CS/MD & GENERATOR SET, MARS 90, 100 CS/MD & GENERATOR SET, TITAN 130, 250 CS/MD & GENERATOR SET

· high‑speed gas turbine generator set

Model Number

TAS000017R

Strengths

Very high power‑to‑weight ratio – saves valuable space on board
Fuel flexible (diesel, marine diesel oil, natural gas) and meets EPA Tier 4 / IMO Tier III emission limits
Modular design allows quick installation and easy maintenance access
Fast start‑up time (seconds to minutes) for emergency power or load changes
Broad class approvals (DNV, ABS, LR) facilitating certification on new builds

Weaknesses

Higher capital cost compared with conventional diesel generators of similar rating
Requires specialized turbine maintenance expertise and spare parts inventory
Exhaust heat rejection needs adequate ventilation or heat‑recovery integration
Efficiency drops at very low load – not ideal for vessels with consistently light power demand
Noise level higher than low‑speed diesel sets, may need additional acoustic treatment

Typical Vessels: LNG carrierCruise shipOffshore support vessel (OSV)FPSO / FSRUNaval auxiliary shipDP2/DP3 platform supply vessel

Certifications: DNVABSLloyd's RegisterUSCG Type Approval (for selected models)

Decision Guide: Choose if you need high power density, fast start‑up, low emissions and fuel flexibility on a vessel with moderate to high auxiliary power demand. Avoid if the ship operates mainly at very low loads, budget constraints dominate, or you lack turbine‑maintenance capability onboard.

Use Cases: These generator sets are typically installed as main service generators on LNG carriers for boil‑off gas handling, as emergency/auxiliary power sources on cruise ships, and as DP‑ready power plants on offshore support vessels where rapid response and compact footprint are critical. They also serve in hybrid propulsion schemes where shaft power can be supplemented by turbine‑driven electricity.

Datasheet

Centaur 40/50, Taurus 60/70, Mars 90/100, Titan 130, Titan 250 Generator Packages

· gas turbine driven shaft generator

Model Number

TAM0000025

Strengths

Very high power‑to‑weight ratio – saves valuable engine room space
Fast start‑up (seconds) useful for emergency or peak‑shaving applications
Low NOx emissions meeting IMO Tier III in many operating regimes
Fuel flexibility – can run on diesel, marine gas oil and, with optional kits, LNG
Proven DNV classification and long service history in offshore vessels

Weaknesses

Higher specific fuel consumption than equivalent diesel generators at part load
Requires high‑quality fuel and filtration to protect turbine hot sections
Initial capital cost and lifecycle maintenance are generally greater than low‑speed diesels
Noise and vibration levels need careful mitigation in passenger vessels
Limited availability of spare parts in remote ports compared with conventional engines

Typical Vessels: Offshore Supply Vessel (OSV)Platform Supply Vessel (PSV)Fast Ferry / Ro‑PaxCruise Ship auxiliary powerNaval auxiliary or support ship

Certifications: DNV

Decision Guide: Choose if you need a compact, high‑power generator that can start instantly and meet strict emission limits, especially where engine‑room space is at a premium. Avoid if fuel efficiency at low load, upfront cost or long‑term maintenance budget are the primary concerns.

Use Cases: These packages are commonly installed as emergency generators, peak‑shaving units, or PTO drives for propulsion assist on offshore support vessels and fast ferries where rapid power availability and space savings outweigh higher fuel use.

Datasheet

ABB

1

ABB Shaft Generator AMG unverified

· synchronous shaft generator

Strengths

High conversion efficiency (typically >95%) reduces fuel consumption when supplying ship service power.
Compact, modular design saves valuable deck space compared with separate diesel generators.
Integrated ABB control system enables seamless load sharing with auxiliary generators and automatic start‑stop functions.
Proven reliability on a wide range of vessel types; low maintenance due to oil‑free bearing options.

Weaknesses

Power output is limited by main engine speed and torque – cannot supply full ship power when the main engine is idle.
Higher initial capital cost than conventional diesel generators of similar rating.
Requires precise alignment and regular shaft monitoring; installation complexity can be higher on retrofits.
Limited redundancy if the main propulsion line suffers a fault.

Typical Vessels: ContainerBulk CarrierTankerCruise ShipOffshore Supply Vessel

Decision Guide: Choose if: you need efficient, space‑saving power generation while the main engine is running and want to lower diesel generator run‑time. Avoid if: you require large independent power capacity when the main engine is stopped or have strict budget constraints on upfront equipment cost.

Use Cases: Commonly installed on vessels that operate long voyages at steady speeds, providing ship service power (lighting, HVAC, cargo handling) and reducing auxiliary diesel generator load; also used for emergency power supply in compliance with SOLAS requirements.

Datasheet

Air Products

1

Marine Nitrogen Generator, Cabinet Model NC1, NC1-1204P---NC1-1816P, NC1-1408S---NC1-2024S, NC1.3-0803--NC.1.3-5896, NC1.3-1814S--2024S, Cabinet Model NC0, NC.0.3-0803, MDC1.0-0603---MDC1.0-1008, NC2.1-1750, NC2.1-3000, NC2.1-6000, MSC1.0-0820---MSC1.0-3072, MSC2.0-0820---MSC2.0-3072

· Membrane nitrogen generator

Model Number

TAP00001E8

Strengths

Delivers up to 99.999% nitrogen continuously without the need for cryogenic storage.
PTO drive uses existing shaft power, reducing electrical load on the vessel.
Compact modular cabinet fits limited engine‑room spaces and can be scaled by adding modules.
Lower operating cost compared with liquid nitrogen supply and handling.
Integrated control interface allows automatic operation linked to cargo inerting requirements.

Weaknesses

Requires sufficient shaft power; performance drops at low engine loads or during maneuvering.
Higher upfront capital expense than portable electric generators.
Membrane modules have a finite service life and must be replaced periodically.
Sensitive to inlet air quality; pre‑filtration is mandatory to avoid fouling.
Maximum flow capacity may be insufficient for very large tankers that need bulk nitrogen.

Typical Vessels: Crude Oil TankerProduct TankerChemical TankerLPG CarrierBulk Carrier (inert cargo)Offshore Supply Vessel

Certifications: DNV

Decision Guide: Choose if the vessel requires a continuous, high‑purity nitrogen supply for inerting, tank cleaning or fire‑suppression and has adequate shaft power and space for a PTO‑driven unit. Avoid if the ship operates frequently at low engine loads, has very high nitrogen demand that exceeds module capacity, or budget constraints preclude the higher initial cost.

Use Cases: On‑board generation of inert gas for cargo tank inerting during loading/unloading, nitrogen purge for tank cleaning, supplying fire‑extinguishing systems, and supporting ballast water treatment where an oxygen‑free environment is needed.

Datasheet

Beta Marine

1

BetaGen 10 Marine Generator

Per ship electrical load analysis · 7.0 kW · Diesel · shaft-driven synchronous generator

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel

Application

marine generator set

Common Failures & Inspection Points

Raw-water impeller failure
Heat exchanger fouling
Alternator bearing wear

Service: Typical routine service includes oil/filter change, fuel filter change, seawater pump inspection and belt tension check according to Beta Marine schedule.

Spare Parts: Keep impeller kit, filters, belts, zinc anodes where fitted, thermostat and alternator bearings depending on operating area.

Strengths

Eliminates need for separate auxiliary diesel generators during cruising, saving fuel and space
Direct coupling to main engine reduces transmission losses and emissions
Compact installation – utilizes existing shaft line and eliminates extra genset rooms
Diesel‑fuel only; proven reliability in marine environments
Simplified control integration with ship’s power management system

Weaknesses

Power output tied to main‑engine speed; limited or no generation when engine is idling or at low RPM
Adds mechanical load to the propulsion shaft, potentially increasing wear on PTO bearings
Raw‑water cooling system prone to impeller failure and heat‑exchanger fouling, requiring vigilant maintenance
Alternator bearing wear reported in field experience, leading to periodic overhauls
No built‑in redundancy – loss of main engine means loss of electrical generation

Typical Vessels: Container shipBulk carrierCruise linerRo‑Ro ferryOffshore supply vessel

Decision Guide: Choose if the vessel operates primarily at constant cruising speed, has a PTO provision and wants to reduce auxiliary diesel generator fuel consumption and emissions. Avoid if the ship requires flexible power independent of propulsion, frequently operates at low engine speeds, or cannot accommodate additional shaft‑line maintenance.

Use Cases: The BetaGen 10 is typically installed on large merchant vessels to supply hotel load, navigation equipment, and cargo handling systems during sea voyages, acting as the primary source of electrical power while underway and providing a backup when docked.

Datasheet

Cummins Generator Technologies

1

Type UCM 224, 274, HCM 534/S5L 1M, 634, S4L 1M, PM 734/S7L1M and S6L1M 3 phases, 4 poles, single or 2 bearings brushless A.C. generator.

· brushless AC shaft generator

Model Number

TAE000018X

Strengths

Brushless construction eliminates the need for regular exciter maintenance.
Three‑phase output provides high efficiency and smooth power delivery.
Four‑pole design allows operation over a wide range of shaft speeds.
Single or dual bearing options give flexibility for different installation constraints.
Cummins brand reputation ensures proven reliability and global support.

Weaknesses

Power rating is limited to the specific UCM/HCM/PM series; may not meet very high‑power demands.
Integration requires precise alignment with shaft speed and control system, adding installation complexity.
Initial capital cost can be higher than conventional diesel generators of comparable output.
Spare parts for niche bearing configurations may have longer lead times in remote ports.

Typical Vessels: Container shipBulk carrierTankerCruise linerOffshore supply vessel

Certifications: DNV

Decision Guide: Choose if: you need a low‑maintenance, shaft‑driven power source with DNV approval for auxiliary or emergency power on medium‑size vessels. Avoid if: the required electrical output exceeds the model’s rating, space is extremely constrained, or you prefer a simpler diesel generator set without PTO integration.

Use Cases: Provides ship service power while underway, reduces main engine load during cruising, supplies hotel loads and emergency power, and can support dynamic positioning systems on offshore vessels where shaft‑driven generation is advantageous.

Datasheet

Cummins Onan

1

MDKDN Marine Generator

Per ship electrical load analysis · 13.0 kW · Diesel · shaft-driven diesel generator

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel

Application

marine generator set

Common Failures & Inspection Points

Raw-water pump impeller failure
Heat exchanger fouling
Control board or sensor faults in humid spaces

Service: Follow Cummins Onan marine service schedule. Routine maintenance includes oil and filter changes, fuel filter service, impeller inspection and periodic load run.

Spare Parts: Keep impeller kit, oil and fuel filters, belts, zincs if fitted, control fuses and starter solenoid.

Strengths

Compact integration with the main propulsion line eliminates need for separate prime‑mover space.
Cummins Onan’s proven control electronics provide automatic load sharing and fault detection.
Designed for marine environments with corrosion‑resistant enclosures and raw‑water cooling.
Standardized service intervals (oil, fuel filter, impeller) simplify maintenance planning.
Compatible with 50 Hz, 1500 rpm main engine speeds common on many commercial vessels.

Weaknesses

Electrical output is directly tied to shaft speed; power varies with propulsion load unless equipped with a constant‑speed gearbox.
Raw‑water pump impeller wear can lead to overheating if not inspected regularly.
Heat‑exchanger fouling in warm seas may reduce cooling efficiency and require periodic cleaning.
Control board or sensor failures are more likely in high‑humidity engine rooms, increasing downtime risk.
Initial purchase cost is higher than a stand‑alone diesel generator of comparable rating.

Typical Vessels: Cruise shipsFerriesOffshore supply vesselsNaval auxiliariesContainer ships with integrated power systems

Certifications: ABSDNV GLUSCG Type Approval

Decision Guide: Choose if: you need a reliable, space‑saving source of electrical power that can run off the main engine and you operate vessels with relatively constant shaft speed (e.g., cruise or ferry service). Avoid if: your vessel requires high, variable power output independent of propulsion speed, operates in extremely humid compartments without adequate ventilation, or you prefer a separate generator set for redundancy.

Use Cases: The MDKDN is typically installed on the main engine’s PTO shaft to supply hotel loads, navigation equipment, and auxiliary systems during normal cruising. It is also used as an emergency power source when the main diesel generators are offline, providing seamless transition in vessels where space and weight savings are critical.

Datasheet

Fischer Panda

1

Panda 15000i PMS Marine Generator

Per ship electrical load analysis · 12.0 kW · Diesel · Permanent Magnet Synchronous (PMS) shaft generator

Frequency (Hz)

50

Fuel Types

Diesel

Application

marine generator set

Common Failures & Inspection Points

Seawater pump impeller failure
Exhaust elbow corrosion
Inverter/control faults on variable-speed units

Service: Service oil, fuel filters, seawater impeller and coolant circuit according to Fischer Panda interval schedule. Check exhaust water injection and anti-siphon arrangement regularly.

Spare Parts: Keep impeller kit, filters, belts, glow plugs, exhaust temperature sensor and inverter/control fuses.

Strengths

High electrical efficiency due to permanent‑magnet design
Compact and lightweight compared with conventional alternators of similar output
Brush‑less operation reduces routine maintenance intervals
Integrated variable‑speed control allows power generation over a wide engine speed range
Fast start/stop capability supports load‑following strategies for fuel savings

Weaknesses

Higher capital cost than traditional brush‑type shaft generators
Inverter/control electronics are sensitive to harsh marine environments, leading to reported faults on variable‑speed units
Seawater pump impeller wear is a known recurring maintenance item
Exhaust elbow corrosion has been observed in long‑term service
Requires strict adherence to coolant and anti‑siphon system checks

Typical Vessels: Container shipsTankers (crude, product)Bulk carriersCruise linersLNG carriersOffshore supply vessels

Certifications: IMO D‑2DNV GL

Decision Guide: Choose if you need a high‑efficiency, space‑saving shaft generator with variable‑speed capability and are prepared for the higher upfront cost and disciplined maintenance of seawater pump and inverter systems. Avoid if budget constraints favour conventional alternators or if vessel operations cannot guarantee the required coolant/anti‑siphon monitoring.

Use Cases: Typically installed on large ocean‑going vessels to supply hotel loads, reduce diesel generator run‑time, provide emergency power, and enable fuel‑saving load‑following strategies while the ship is under way. The unit is often paired with an integrated control system that manages power quality and synchronisation with other generators.

Datasheet

GE Gas Turbines

1

GE Mk VIe and GE Mk VIeS Turbine Controllers for Electric Motor / Compressor Set and for Turboexpander / Generator Set

· digital turbine controller

Model Number

TAA000001E

Strengths

Integrated condition‑monitoring and diagnostics reduce unplanned downtime.
Modular architecture allows easy upgrades and field replacements.
Meets DNV class requirements for marine gas‑turbine control systems.
Fast response times improve shaft power stability for PTO or generator applications.
Proven on LNG carrier turboexpander‑generator installations.

Weaknesses

Higher capital cost compared with legacy analog controllers.
Requires specialized training and certification for operation and maintenance.
Limited aftermarket support in regions without a GE service hub.
Compatibility limited to newer GE turbine platforms; retrofits can be complex.
Dependence on shipboard power quality for controller electronics.

Typical Vessels: LNG CarrierLPG CarrierChemical TankerOffshore Support VesselCruise Ship

Certifications: DNV

Decision Guide: Choose if you need a modern, class‑approved digital controller for gas‑turbine driven compressors, electric motors or turboexpander‑generator sets with built‑in diagnostics and high reliability. Avoid if budget constraints dominate, the vessel already uses a compatible legacy control system, or local service support for GE controllers is unavailable.

Use Cases: Commonly installed on LNG carriers to manage turboexpanders that convert boil‑off gas into shaft power for generators, on offshore platforms where gas turbines drive compressors or auxiliary generators, and on vessels requiring PTO‑driven shaft generators for auxiliary power supply.

Datasheet

HWA YOUNG

1

Digital Panel for Marine Generator Engines (DGP-2000)

· Digital generator control panel

Model Number

TAA00001WS

Strengths

Integrated display of key generator parameters (frequency, voltage, load, temperature)
Built‑in alarm management and fault logging for rapid troubleshooting
Compatibility with common ship automation networks (NMEA 2000, IEC 61162)
Remote diagnostics capability via Ethernet or satellite link

Weaknesses

Requires trained personnel to operate and interpret advanced diagnostic data
Higher initial cost compared with basic analog gauges
Potential integration challenges on vessels with legacy control systems
Dependence on electronic components may increase maintenance complexity in harsh marine environments

Typical Vessels: TankerContainer shipBulk carrierCruise linerOffshore supply vessel

Certifications: DNV

Decision Guide: Choose if the vessel needs precise, real‑time monitoring of shaft generator performance, wants automated alarm handling and remote support, or is upgrading to a fully integrated automation system. Avoid if the operator prefers simple analog instrumentation, has limited budget for electronic upgrades, or the existing control architecture cannot accommodate digital interfaces.

Use Cases: The DGP-2000 is typically installed on newbuilds or retrofits where shaft generators supply shipboard electricity during propulsion or as emergency power sources, especially on vessels with high electrical demand and a requirement for automated monitoring and reporting.

Datasheet

JiangSu Enda General Equipment Group

1

ED212 Self Starting Panel for Generator

· Self‑starting generator control panel

Model Number

TAA00000EV

Strengths

Integrated automatic start function reduces crew workload during power‑loss events.
Compact, purpose‑built design fits typical engine room layouts for shaft generators.
DNV‑referenced model number (TAA00000EV) suggests compliance with DNV standards for marine electrical equipment.
Simple wiring scheme eases installation on new builds or retrofits.

Weaknesses

Limited to basic monitoring; advanced diagnostics and remote condition monitoring are not provided.
No built‑in redundancy – a single panel failure could disable the shaft generator start capability.
Proprietary interface may require specific spare parts from JiangSu Enda, affecting logistics on some fleets.
Documentation and support in languages other than Chinese can be sparse.

Typical Vessels: Bulk CarrierTankerContainer ShipGeneral Cargo

Decision Guide: Choose if: the vessel needs a straightforward, DNV‑referenced self‑starting solution for a shaft generator and values compactness and ease of installation. Avoid if: high‑availability redundancy, advanced remote monitoring, or multi‑panel architectures are required.

Use Cases: Commonly installed on newbuilds or during retrofits where a shaft‑driven generator is added to meet energy‑efficiency targets and provide emergency power without extensive auxiliary diesel sets.

Datasheet

Kashiwa Co., Ltd., Tsukuba Works

1

Inert Gas Generator, Model No.; KGG-500

· shaft-driven inert gas generator

IMO Approved

ja

Model Number

MEDB000019C

Strengths

Direct PTO connection eliminates need for separate electric drive motor
Compact layout suited to limited engine room space
High fuel‑efficiency by utilizing waste heat from the main engine
Fully automatic control system with IMO‑approved safety functions
Proven reliability of Kashiwa’s Japanese engineering heritage

Weaknesses

Requires sufficient shaft power; not suitable for vessels without a compatible PTO
Higher vibration and noise levels compared with electric IGGs
Maintenance involves periodic inspection of turbine and exhaust passages
Initial integration cost can be higher than retrofit‑only electric units

Typical Vessels: Oil tankerChemical tankerLPG carrierVLCCMR tanker

Certifications: IMO approvedDNV class approval

Decision Guide: Choose if the vessel already has a main‑engine PTO and you want an integrated, fuel‑efficient IGG with proven IMO/DNV approval. Avoid if the ship lacks suitable shaft power, prefers a low‑vibration electric solution, or operates on a platform where space for exhaust handling is limited.

Use Cases: The KGG-500 is typically installed on new‑build oil and chemical tankers during construction to provide continuous inert gas supply for cargo tank inerting. It is also used in retrofits of existing tankers that have compatible shaft power, replacing older steam‑type IGGs with a more efficient, compact system.

Datasheet

Kohler Marine

1

Kohler 40EFOZDJ Marine Generator

Per ship electrical load analysis · 40.0 kW · Diesel · shaft PTO diesel generator

discontinued

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel

Application

marine generator set

Common Failures & Inspection Points

Seawater pump impeller failure
Heat exchanger fouling
Starter and solenoid faults after humid engine-room exposure

Service: Typical routine maintenance includes oil/filter service, fuel filter replacement, impeller inspection and load testing according to Kohler manual.

Spare Parts: Keep impeller kit, filter kit, belts, zinc anodes if fitted, starter solenoid and control fuses.

Strengths

Compact, low‑profile design fits easily on existing shafts
Integrated control panel with automatic load sharing and protection functions
Kohler’s reputation for durable marine diesel engines
Fast start‑up and synchronization with ship electrical system
Suitable for retrofitting on vessels that already have a PTO arrangement

Weaknesses

Seawater pump impeller prone to wear/failure if not inspected regularly
Heat exchanger fouling can reduce cooling efficiency in warm waters
Starter motor and solenoid are sensitive to high humidity in engine rooms
Limited power output (≈40 kW) may be insufficient for larger vessels or high‑load scenarios
Routine oil and filter changes required at relatively short intervals compared with newer low‑speed gensets

Typical Vessels: Coastal tankerFerryOffshore supply vesselResearch vesselYacht

Decision Guide: Choose if you need a compact, proven 40 kW shaft‑driven generator for medium‑size vessels with existing PTO capability and value reliability over the latest low‑speed technology. Avoid if your vessel requires higher power output, operates in extremely humid engine rooms without adequate ventilation, or you prefer newer designs with reduced maintenance intervals.

Use Cases: Commonly installed on mid‑size commercial ships and workboats to supply hotel loads, navigation equipment, and emergency power when the main engine is running. It is also used on retrofits where space is limited and a direct mechanical drive from the propulsion shaft is preferred over separate diesel engines.

Datasheet

Kongsberg

1

Kongsberg Hybrid shaft generator

· Hybrid shaft‑generator

Model Number

Hybrid Shaft Generator

Strengths

Enables load sharing between engine and electric grid for optimal fuel efficiency
Supports integration with onboard battery systems for peak shaving and zero‑emission operation
Reduces engine wear by allowing the main engine to run at its most efficient load point
Compact installation on existing shaft lines, avoiding separate auxiliary generators
Provides fast response power for propulsion assist or emergency power

Weaknesses

Higher capital cost compared with conventional shaft‑driven generators
Increased system complexity requiring specialized control and monitoring software
Additional space needed for power electronics and cooling equipment
Requires skilled personnel for commissioning, operation and maintenance
Potential compatibility issues on vessels with non‑standard shaft arrangements

Typical Vessels: Container shipsBulk carriersTanker (especially LNG)Cruise shipsOffshore supply vesselsFerries

Decision Guide: Choose if: the vessel aims to lower fuel consumption, meet stricter emission caps, or integrate battery storage for hybrid operation; space is limited for separate generators and the operator can invest in advanced control systems. Avoid if: budget constraints prohibit higher upfront cost, crew lacks expertise with hybrid power electronics, or the ship’s shaft layout cannot accommodate the unit.

Use Cases: Kongsberg hybrid shaft generators are typically installed on new builds or retrofits where operators seek to combine diesel propulsion with electric power for peak shaving, shore‑power support, or zero‑emission maneuvering. They are common in vessels pursuing IMO Tier III compliance, LNG carriers using boil‑off gas recovery, and cruise ships looking to reduce emissions during port stays.

Datasheet

Kumoh Mach. & Elec

1

Generator Engine Automatic Control System (GECS)

· Shaft generator automatic load controller

Model Number

TAA00003RG

Strengths

DNV‑approved control logic ensures compliance with class requirements
Integrated load‑sharing and frequency regulation reduces engine torque fluctuations
Built‑in overload and fault protection improves generator reliability
Designed for direct integration with main engine control systems

Weaknesses

Installation requires interfacing with the vessel’s automation network, increasing commissioning time
Limited to shaft or PTO generator configurations; not suitable for independent diesel generators
Proprietary communication protocol may restrict compatibility with some third‑party monitoring systems
Higher initial cost compared with basic manual control panels

Typical Vessels: TankerBulk CarrierContainer ShipCruise VesselOffshore Supply Vessel

Certifications: DNV

Decision Guide: Choose if: you need a class‑approved, automated load‑sharing solution for shaft or PTO generators on large merchant vessels and want integrated engine‑generator coordination. Avoid if: the vessel uses only independent diesel generators, has strict budget constraints, or requires an open‑protocol control system.

Use Cases: Commonly installed on ships where the main propulsion shaft is used to generate ship service power—e.g., tankers and bulk carriers using a shaft generator or PTO unit to supply electricity while underway, helping to reduce fuel consumption and maintain stable voltage/frequency for onboard loads.

Datasheet

Mecc Alte

1

ECO38, -40, -43, -46 and ECP32, -34, 3 phases, 4 poles, single or double bearings, brushless A.C. generator.

· brushless AC shaft generator

Model Number

TAE000017N

Strengths

High efficiency and low maintenance thanks to brushless design
Compact size suitable for vessels with limited engine‑room space
Available with single or double bearing arrangements for flexible installation
DNV class approval (model TAE000017N) ensures compliance with marine standards
Can be driven either directly from the main shaft or via a PTO, offering operational flexibility

Weaknesses

Limited power output (max ~46 kVA), not suitable for high‑power shipboard loads
Requires a relatively constant shaft speed range to maintain rated performance
Initial purchase price higher than conventional brushed alternators of similar rating
Cooling and ventilation must be adequately provided; otherwise overheating risk
Installation may need precise alignment and bearing selection, adding engineering effort

Typical Vessels: Coastal cargo vesselsOffshore supply shipsFerriesSmall tankersPatrol boatsYachts and luxury liners

Certifications: DNV

Decision Guide: Choose if you need a compact, low‑maintenance auxiliary power source in the 30‑46 kVA range for vessels with limited engine‑room space and a relatively steady shaft speed. Avoid if your vessel requires higher power output, operates over a wide speed range, or has strict weight/space constraints that favor lighter alternatives.

Use Cases: Typically installed on small to medium merchant ships as the primary auxiliary generator for hotel loads, deck machinery, and emergency power; also used in offshore support vessels where space is at a premium and a reliable shaft‑driven source is preferred over diesel generators.

Datasheet

Micoda Process Systems International

1

Frame for Generator

· Shaft generator mounting frame

Model Number

TAS0000483

Strengths

DNV‑approved design (TAS0000483) ensures compliance with class rules for vibration and alignment
Robust steel construction with corrosion‑resistant coating suitable for harsh marine environments
Modular layout allows relatively straightforward installation on a range of shaft diameters
Integrated vibration isolation pads reduce transmission to hull structures
Designed for easy access to generator for maintenance

Weaknesses

Relatively heavy component may affect overall weight budget of the propulsion system
Limited to specific shaft size ranges; custom adaptation required for non‑standard shafts
Higher upfront cost compared with basic, non‑certified frames
Installation requires precise alignment procedures and skilled fitters
Field performance data limited to projects that have published case studies

Typical Vessels: Container shipBulk carrierCruise linerRo‑Ro ferryOffshore support vessel

Certifications: DNV

Decision Guide: Choose if you need a DNV‑approved, vibration‑controlled mounting solution for a shaft‑driven generator on vessels where reliability and class compliance are critical. Avoid if the vessel has space or weight constraints, uses non‑standard shaft dimensions, or budget limits preclude a certified frame.

Use Cases: Commonly installed on large commercial ships that generate electricity from the main propulsion line to supply hotel loads, emergency power, or auxiliary systems, especially where class societies require documented vibration and alignment standards.

Datasheet

Nanni

1

Nanni QLS 32T Marine Generator

Per ship electrical load analysis · 24.0 kW · Diesel · shaft‑driven diesel generator

Speed (rpm)

1500

Frequency (Hz)

50

Fuel Types

Diesel

Application

marine generator set

Common Failures & Inspection Points

Raw-water pump impeller failure
Heat exchanger fouling
Exhaust mixing elbow corrosion

Service: Routine service includes oil/filter change, fuel filters, impeller inspection and coolant checks according to Nanni schedule.

Spare Parts: Keep impeller kit, filters, belts, zincs if fitted, thermostat and glow plugs.

Strengths

Compact integration on the main engine eliminates need for a separate auxiliary diesel set
Reduces fuel consumption and emissions by using waste mechanical power
Low noise and vibration compared with standalone generators
Simple maintenance schedule (oil, filter, impeller, coolant) per Nanni’s service plan
Fast response to load changes when the main engine is running

Weaknesses

Limited output (~32 kW) unsuitable for high‑power hotel loads on large vessels
Power availability tied to main‑engine speed; low‑speed operations reduce generation capacity
Known susceptibility to raw‑water pump impeller wear and heat‑exchanger fouling
Exhaust mixing elbow corrosion reported in harsh marine environments
Requires reliable PTO coupling; failure can disable all onboard power

Typical Vessels: FerryOffshore Supply Vessel (OSV)Coastal Cargo / FeederYachtSmall research vessel

Decision Guide: Choose if: you need a space‑saving, fuel‑efficient generator up to ~35 kW on vessels that run their main engine at constant 1500 rpm and have modest hotel loads. Avoid if: the ship requires higher electrical capacity, operates frequently at low engine speeds, or cannot tolerate any loss of power from PTO failure.

Use Cases: The QLS 32T is typically installed on small to medium vessels to supply continuous shipboard electricity while underway, serve as an emergency power source, and lower auxiliary diesel consumption by harvesting mechanical energy from the main propulsion shaft.

Datasheet

PAC Eastcoast Engineering & Services

1

Frame for Generator

· Shaft generator frame

Model Number

TAS0000534

Strengths

Built to DNV-approved specifications (model TAS0000534)
Robust steel construction with corrosion‑resistant coating for marine environments
Modular design enables relatively straightforward installation and replacement
Facilitates direct use of shaft power for auxiliary electricity, improving fuel efficiency

Weaknesses

Significant weight adds to overall vessel deadweight and may affect stability margins
Installation requires precise shaft alignment and possible modifications to existing PTO arrangements
Limited customization options compared with fully integrated generator packages
Higher upfront cost than some off‑the‑shelf generator mounting solutions

Typical Vessels: Container shipBulk carrierTankerCruise linerRo‑Ro vessel

Certifications: DNV

Decision Guide: Choose if the vessel already has a main engine PTO and seeks a DNV‑approved, robust mounting solution to add shaft‑driven auxiliary power. Avoid if space, weight or budget constraints make a lighter, integrated generator set more appropriate.

Use Cases: Commonly installed on large commercial vessels to generate electricity while underway, reducing diesel generator run‑time; also used as backup power during port stays or emergencies where shore power is unavailable.

Datasheet

Shaft Generator / PTO

What sets a shaft generator apart

Main components

Power take-off and gearbox

Generator and frequency control

Clutch and synchronizing gear

Cooling and monitoring

Selection and sizing

Regulations and class

Typical faults

What to look for in a supplier

Typical Manufacturers

28 manufacturers · 64 models

Caterpillar / MaK

Cummins

MTU

John Deere

Wärtsilä

ABB Marine

ABB Oy, Distribution Solutions

DEIF

MacGregor

Northern Lights

Solar Turbines

ABB

Air Products

Beta Marine

Cummins Generator Technologies

Cummins Onan

Fischer Panda

GE Gas Turbines

HWA YOUNG

JiangSu Enda General Equipment Group

Kashiwa Co., Ltd., Tsukuba Works

Kohler Marine

Kongsberg

Kumoh Mach. & Elec

Mecc Alte

Micoda Process Systems International

Nanni

PAC Eastcoast Engineering & Services