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50 Best Marine Generators

Last Updated: July 2, 2019

Marine generators are used on a variety of ships to power everything from minor kitchen appliances to electric propulsion systems. When running any serious applicants that consume a good deal of power, such as air conditioners, refrigerators, or water heaters, a boat’s battery will not be sufficient. The best marine generators will effortlessly power electronic equipment and devices without putting stress on the boat’s battery.

Every marine generator is powered by either gasoline or diesel, and you’ll need to choose a generator that is powered by one or the other. Most people decide to stick with the same fuel type the boat requires out of convenience, though this isn’t required. Avoid bringing a standard generator onboard your boat, however. Marine generators designed to withstand harsh marine environments, whereas a standard generator would fail.

Robust marine generators require equally robust tracking mechanisms. With Metalphoto of Cincinnati’s durable nameplates and barcode labels, you can track maintenance and monitor marine generators and other equipment throughout the lifespan of your assets. MPC’s Metalphoto® photosensitive anodized aluminum resists corrosion, abrasion, and fading for durable product and process identification in harsh marine environments. Whether you’re tracking marine propellers or the generators that power them, Metalphoto® photosensitive anodized aluminum has been the material of choice for more than five decades.

Below, we’ve detailed 50 of the best marine generators on the market today, divided by gas, diesel, and heavy duty diesel categories so you can easily identify the best marine generators for your needs.

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Gas Powered Generators

1. KOHLER 5 EKD
@KOHLERPower

KOHLER 5EKOD

The KOHLER 5 EKD is a 2 cylinder, 4 cycle gasoline-powered generator equipped with a remote start 12-pin connector. Smartly designed with maintenance access to key components from a single side, this generator is ready to be mounted into a convenient position, and an optional sound shield enclosure contributes to its well-rounded livability. Emissions are EPA compliant, and copper windings ensure minimal heat buildup. Those who do not need tremendous power output from their generator will find this KOHLER 5 EKD to be an efficient workhorse that is minimally invasive.

Key Features:

  • Integral head exchanger
  • Remote start 12-pin connector
  • Rotor and stator are vacuum impregnated and coated with high-bond epoxy varnish
  • CARB/EPA emission compliant (Low CO)

Cost: Request Quote

2. KOHLER 7.5 EKD
@KOHLERPower

Kohler 75

An increase in power often correlates with more noise, turbulence, and complexity, but that’s not the case with the KOHLER 7.5 EKD. With a 50% increase in kilowatts over its lightweight companion, this marine generator has a much more robust power output while maintaining an unobtrusive footprint. Connected directly to the engine, this generator is equipped with sealed precision ball bearings and a steel sleeve to prevent misalignment and extend the machine’s life.

Key Features:

  • Remote start 12-pin connector
  • One-side serviceability
  • Voltage regulation of ±1.5%
  • Insulation meets NEMA standards for class H insulation

Cost: Request Quote

3. Westerbeke 3.5 SBCG
@WesterbekeCorp

Westerbeke 35

Claiming to be “the most compact, and quiet, 3.5kW gasoline generator available,” the Westerbeke 3.5 SBCG sticks to its guns by forgoing a sound shield altogether. Operating a smooth, electronically-controlled 2200 RPM, and starting effortlessly with multiport electronic fuel injection, there’s no question as to how Westerbeke kept this generator so quiet. The 3.5kW output is powerful enough to run electronically-thirsty machinery such as air conditioners and water heaters without fuss, and it weighs less than 200 pounds.

Key Features:

  • Simple, “one-touch” start/stop control panel
  • AC circuit breaker
  • Multiport Electronic Fuel Injection

Cost: $9,200

4. Westerbeke 5.0 MCGA
@WesterbekeCorp

Westerbeke 50

One of the most compact, lowest-speed, and lowest-emission gasoline generators on the market, the Westerbeke 5.0 MCGA is a high-performance generator with a low profile. At an 1800 RPM run speed, this generator is exceptionally smooth and quiet compared to other 3600 RPM 5kW marine generators. From operation to usability, everything about this generator was designed for efficiency. The butter-smooth 3 cylinder, 4 cycle motor is paired with creature comforts such as a one-touch control panel and LED indicator lights that make this a user-friendly marine generator.

Key Features:

  • Water-cooled returnless fuel system
  • Field convertible to 50 or 60Hz
  • Belt-driven, raw water pump
  • Safety shutdown mechanism for low oil pressure and high exhaust temperature

Cost: $10,800

5. Westerbeke 10.0 SBEG
@WesterbekeCorp

Westerbeke 10

This houseboat-designed Westerbeke 10.0 SBEG is a 4 cylinder, 4 cycle marine generator with an AC circuit breaker, 50 amp battery charging alternator. It ensures an exceptionally quiet operation engineered to go virtually unnoticed while operating. Easy operation via a one-touch panel and the electronically governed operating system means minimal attention is needed.

Key Features:

  • Vibration isolators
  • Running hour meter and LED warning annunciation lights
  • 5-year limited warranty

Cost: Request Quote

6. Westerbeke 22.5 SBEGA
@WesterbekeCorp

Westerbeke 225

The most powerful gasoline-fueled marine generator on our list, the Westerbeke 22.5 SBEGA pumps out a whopping 22.5kW from its 6.0 HP, 4 cylinder, 4 cycle motor. Despite its impressive energy output, this generator runs as smooth and quiet as the rest of the Westerbeke houseboat series marine generators. Durable, reliable, and efficient, this marine generator meets EPA emission standards and comes backed by a 5-year warranty. If you need plenty of power but want to stick to gasoline, this is a top-of-the-line generator that will fulfill your needs for years to come.

Key Features:

  • Multiport electronic fuel injection
  • EPA & CARB compliant
  • 5-year limited warranty

Cost: Request Quote

Diesel Powered Generators

7. CAT C1.5
@CaterpillarInc

CAT C15

A reliable and respected brand in all things machinery, CAT has created an extensive line of diesel-powered marine generators that will fulfill anyone’s needs for auxiliary power. This C1.5 model is one of their smallest editions. Though compact, the C1.5 marine generator produces an impressive 14.5ekW ideal for modest power needs. 100% block loading capability starts big power loads with ease, and an indirect injection system will make cold starting a breeze. With 1500 or 1800 RPM options set at 50 or 60 Hz, the power output is reliable as the operation is smooth. Anti-vibration mounts keep vibration at a minimum.

Key Features:

  • In-line 3 cylinder, 4 cycle diesel generator
  • Single-side servicing with 500-hour oil and filter change interval
  • Automatic safety shutdowns
  • 12 or 24-volt electric starting motor

Cost: Request Quote

8. Fischer Panda AC 8 to 15 Mini
@FischerPandaUSA

Fischer Panda AC Mini

Powered by a freshwater-cooled 3 cylinder diesel engine, the Fischer Panda AC Mini comes in multiple power options between 8 and 15kW. A proprietary Voltage Control System guarantees stable voltage within +/- 3 volts. This marine generator comes standard with a user-friendly digital control panel and a sound shield. Optional accessories include motor mounts, anti-siphon valve vented loops, an exhaust water separator, and a low profile muffler for when the muffler cannot be installed lower than the genset.

Key Features: 

  • Proprietary Voltage Control System
  • Freshwater cooled asynchronous alternator
  • Internal float switch allows automatic operation

Cost: Request Quote

9. Fischer Panda DC 5000 and 6000
@FischerPandaUSA

Fischer Pands DC

The Fischer Panda DC marine generators are powered by a horizontal, water-cooled diesel engine equipped with an auto start/stop system that will turn on to recharge your batteries and shut off when they’re full. A direct driven permanent magnet generator, these DC generators are fuel efficient and pump out a high-quality current. 12 volts is standard, though custom voltage is available upon request.

Key Features:

  • Panda AGT Generator charges the batteries automatically
  • Available in many voltages and amperage outputs upon request
  • Continual supply of AC voltages for consumers through selected electrical inverters

Cost: Request Quote

10. Fischer Panda Marine AC 4200 to 6500
@FischerPandaUSA

Fischer Pands Marine AC

A hearty twin-cylinder motor powers the Fischer Panda AC marine generators. Comparable in efficiency and reliability to the DC variant of Fischer Panda generators, the current output solely depends on your electrical needs. AC or DC, Fischer Panda marine generators product quality electrical currents from their efficient and reliable engines. Each generator comes with a 5-year warranty from the company, ensuring that you’ll have a top-tier functioning generator for the years ahead.

Key Features:

  • Safety shutdowns for all critical functions
  • Direct driven fresh water-cooled Asynchronous Alternator
  • 5-year limited warranty

Cost: Request Quote

11. GenTec 6000 to 18000
@GlobalTecLLC

GenTec Low RPM

GenTec’s range of marine generators from the 3000 to 3600 RPM range are enclosed in sound-dampening fiberglass enclosures that have a sleek style and work well to subdue the noise and vibration of their operation. These generators provide a continuous output of 4kW and are primed to pump up the power when necessary. Fit with a fresh water heat exchanger and an AC water-cooled generator, this marine generator will stay cool as a cucumber under heavy load and extended usage.

Key Features:

  • Synchronous, brushless, AC water-cooled generator
  • Fiberglass sound-dampening enclosure
  • Remote controlled 12-volt electrical starter

Cost: Request Quote

12. GenTec Low RPM 6500 to 16500
@GlobalTecLLC

GenTec 6000 to 18000

GenTec’s Low RPM range of marine generators operate as smoothly and quietly as any other diesel-fueled generator on the market, running quietly at a maximum of 51 decibels. These generators are fitted with load and hour meters so you are always aware of your energy draw, and they will automatically shut off under emergency situations such as when the oil pressure runs too low or the internal temperature rises too high.

Key Features:

  • Low 1500 to 1800 RPM for smooth and silent operation
  • Synchronous, brushless, AC water-cooled generator
  • Fiberglass sound-dampening enclosure
  • Remote controlled 12-volt electrical starter

Cost: Request Quote

13. KOHLER 6EKOD
@KOHLERPower

KOHLER 6EKOD

KOHLER’s 6EKOD is the company’s lightweight diesel marine generator. This single-phase 3 cylinder, 4 cycle motor runs efficiently and conforms to EPA Tier III axillary standards for emission control. The internal closed cooling system and integrated heat exchanger work well to maintain a healthy equilibrium in this little engine, ensuring less wear and tear to give it a long life. Optional sound shield and ignition protection are available.

Key Features:

  • Remote start 12-pin connector
  • Copper windings ensure minimal heat buildup
  • Voltage regulation of ±1.0%

Cost: Request Quote

14. Mase IS 3.2

MASE IS 32

Mase strives to make marine generators that are easy to install onboard boats and maintain high efficiency and power throughout their lifespan. The “soundproof” frame is a utilitarian box that tucks away the interior components behind accessible panels for a minimalistic look. Operating solely at 60 Hz, this generator doesn’t have the versatility of other systems, but if its power output meets your demands this is a great generator to choose. The basic presentation keeps things simple, and the enclosure does well to keep things quiet and looking clean.

Key Features:

  • Utilitarian box frame design
  • 60 Hz only
  • Intercooler system

Cost: Request Quote

15. Mase IS 16.8 T

MASE IS 168T

A low RPM variant, this MASE IS 16.8 T is capable of pumping out a good deal of current through its 3-phase operation. 60 Hz is the only option, but this diesel-fueled generator comes packaged in a minimalistic design that gets its job done without calling attention to itself. Mase promises ease of installation with easy-to-read documentation that’ll make setup quick and operation easy.

Key Features:

  • 3-phase operations at 60 Hz
  • Low RPM for smooth and silent operation
  • Intercooler system

Cost: Request Quote

16. Mase Mariner 5.6

MASE Mariner 56

The Mase Mariner 5.6 is a newly designed marine generator with a large digital screen display with a wealth of on-screen menu options and features not seen in previous models. The cast iron block is a steady base for this air-cooled motor to do its work, setting a solid foundation that reduces motion. This stable 4-stroke diesel engine will produce a max of 5.6kW at 60 Hz.

Key Features:

  • Updated digital display and menu options
  • Soundproof frame
  • Centrifugal mechanical governor

Cost: Request Quote

17. MasPower 4kW

MasPower 4

American engineered and assembled, the MasPower 4kW is a single cylinder Farryman diesel engine with a high power to weight ratio.  A freshwater to seawater heat exchanger prevents seawater from contaminating the engine, making it so that this generator does not require any outside air for cooling. There is an emergency manual hand crank system in place for when you’re desperate for power, a feature that could save lives in a situation where you find yourself stranded at sea. Optional sound-dampening enclosure, meter panels, and anti-siphon break kit can be included.

Key Features:

  • Emergency hand crank system
  • Seawater to freshwater heat exchanger
  • Self-excited through angularly displaced auxiliary winding

Cost: Request Quote

18. MasPower 6 to 9kW

MasPower 6

The MasPower 6 to 9kW marine generator has a more traditional design that is capable of 50 or 60 Hz at 2-phase low RPM modes of 1800 and 1500. This capable generator features a water cooling system, stainless steel mounting supports with rubber isolators for reduced vibrations, and a 12-volt electric fuel pump with a push button primer switch. It’s a basic design made with quality materials that will operate flawlessly. In the happenstance of faulty operation or low fluids, there is an automatic safety shutdown system in place to preserve the engine and reduce the risk of an emergency situation.

Key Features:

  • 12-volt electric fuel pump with a push button primer switch
  • Digital genset controller
  • Remote instrument panel

Cost: Request Quote

19. MasPower 13 to 22.5kW

MasPower 13

The MasPower 13 to 22.5kW model has a 2-phase low RPM operation at 120 or 240V.  Electronic voltage regulation is kept to +3%. Optionally, this high-powered marine generator can be ordered with a four-gauge remote instrument panel, auto start functionality, plug-in wiring harnesses, and a siphon break. All other components are as highly refined as the previously listed models and are American engineered and assembled.

Key Features:

  • Plug-in wiring harnesses
  • Low 1500 and 1800 RPM operation
  • Water-cooled stainless steel exhaust elbow

Cost: Request Quote

20. Next Gen Ultra Compact

Next Gen Ultra Compact

As the name implies, the Next Gen Ultra Compact is small in design, which is ideal for small boats where space is hard to come by. An engine-to-generator rigid attaching plate with a helical timing drive system allows this motor to operate at a mid-field 2800 RPM which balances the high-speed of 3600 RPM systems with the reduced vibration and noise of 1800 RPM systems. The result is a patented design allowing for high-performance from a compact generator that measures length: 28″; width: 15″; height: 15″ with an optional enclosure.

Key Features:

  • Patented compact design with high-performing engine
  • Optional cover which increases the size by a couple of inches all around
  • 7 HP single cylinder engine

Cost: Request Quote

21. Northern Lights 5/4.5 KW
@nlmarine

Northern Lghts 545

The Northern Lights 5/4.5 KW marine generator is a finely tuned piece of machinery. A one-piece heat exchanger, expansion tank, and liquid-cooled exhaust manifold is composed of cast iron to resist corrosion and electrolysis. The 3 cylinder vertical inline diesel engine runs at over 10 HP at a comfortable 1800 RPMs, making this one efficient beast. A direct coupled, four-legged, highly insulated generator gives +5% voltage regulation, and protects its AVR with a dedicated circuit breaker. It’s simply a well-engineered machine. Look no further for refinement in design than Northern Lights.

Key Features:

  • Spin-on oil and fuel filters
  • Gear-driven seawater pump
  • 1500 and 1800 RPM operation

Cost: Request Quote

22. Onan Marine QD 4/5 kW
@Cummins

Onana Marine 4

Being the largest distributor of marine generators in the industry, Cummins is able to provide quality customer assistance and product servicing. That alone is enough to convince some people to purchase an Onan generator from Cummins, but the Onana Marine QD line has its own merits that make it a quality option aside from the brand recognition. Equipped with modern technological displays and controls set in a minimalistic, easily-mounted design, this marine generator is easy to use, easy to install, and won’t call attention to itself without proper cause.

Key Features:

  • Worldwide distributor with a solid reputation
  • Electronic frequency controlled
  • Optimized mounting system reduced vibration

Cost: Request Quote

23. Onan Marine QD 7/9 kW Space Saver
@Cummins

Onan Marine QD 7

The Onan Marine Space Saver packs a robust engine into a small frame. Petite for its power, this 3 cylinder, 4 stroke generator comes tightly packed with a mini fuel pump and shortened water lines to make things as efficient and compact as possible. It’ll run smoothly at 1500 or 1800 RPMs and meets all EPA Tier III emission control standards.

Key Features:

  • 1500 and 1800 RPM operation at 50 or 60 Hz
  • Liquid-cooled
  • Mini fuel pump with shortened water lines

Cost: Request Quote

24. Onan Marine QD 9.5-29 kW
@Cummins

Onan MArine QD 9.5

A 4 cylinder, 4 stroke marine generation, the Onan Marine QD 9.5-29 kW is a versatile powerhouse that will meet whatever needs your boat can muster. Operating at multiple Hz options and a variety of voltages, this generator can do it all. It is available with SAE J-1939 CAN data link for monitoring generator set status and diagnostics for the engine and alternator and has a vivid digital display.

Key Features:

  • 1500 and 1800 RPM operation at 50 or 60 Hz
  • 110 to 240 voltage
  • SAE J-1939 CAN data link

Cost: Request Quote

25. Polar Power 2-CYL

Polar Power 2

The Polar Power 2-CYL marine generator was engineered for yachts with heavy electrical loads. This little engine can power your air conditioner, radar, autopilot, entertainment systems, and more. This is a DC generator which has distinct advantages over its AC counterparts in that it is smaller, lighter, and more powerful than its direct competition. Utilize this generator’s 110 amps for engine starting batteries and cabin electricity, and use the 5.5kW for battery charging, inverter power, and electric propulsion.

Key Features:

  • Soft padded enclosure
  • 2900 RPM operation
  • Tier IV EPA emissions certification
  • Freshwater cooling system governed by a thermostat

Cost: Request Quote

26. Polar Power 3-CYL

Polar Power 3

Stepping up to Polar Power’s 3 cylinder engine actually results in reduced vibration and noise compared to the smaller 2 cylinder model. The 3-CYL can produce between 4 and 4kW, providing adequate power for someone who will rely on their cooling systems often or runs Hybrid Electric Propulsion. Polar Power claims that this generator can outperform a 30kW AC generator and is the most efficient generator on the market. The new Volvo D1 engine inside the generator incorporates a new 115 amp marine alternator that can quickly charge large battery banks.

Key Features:

  • New Volvo D1 engine
  • The smallest recommended engine for powering Hybrid Electric Propulsion
  • Dual 12 and 24 voltage systems
  • Ethernet module for remote connection

Cost: Request Quote

27. Polar Power 4-CYL

Polar Power 4

The big boy from Polar Power, this 4-CYL generator outputs 13 to 20kW engineered for large cruising yachts and commercial vessels. Polar Power recommends running a dual DC generator system that can provide full, consistent power to a Hybrid Electric Propulsion system. For auxiliary power, you can use this DC generator with a battery bank and a quality inverter to provide 24/7 DC and AC power throughout your vessel. Inside, the Volvo D2 engine is designed for the highest onboard comfort experience, reducing motion and noise to a minimum.

Key Features:

  • Comfort-oriented Volvo D2 engine
  • Corrosion protected electrical system
  • Dual 12 and 24 voltage systems
  • Glow plugs for excellent cold starting

Cost: Request Quote

28. VTE PAGURO 6000

VTE Paguro 6000

Lightweight, powerful, silent, and motionless – these are the hallmarks of VTE marine generator design. The VTE Paguro 6000 is a fairly powerful 2 cylinder generator that is equipped with a dual anti-vibration system consisting of 4 soft interior shock absorbers and 4 firm captive engine mounts. This generator will not move a muscle once properly mounted. A multilayered reinforced glass fiber enclosure is padded with high-density sound-dampening foam. You’re not going to hear a thing. This is perhaps the most elegant, unobtrusive marine generator available today.

Key Features:

  • Dual anti-vibration system
  • Multilayered reinforced glass fiber enclosure padded with sound-dampening foam
  • 2-year warranty

Cost: $9,000

29. VTE PAGURO 18000

VTE Paguro 18000

Bringing the refinement of the smaller generator to this very powerful VTE Paguro 18000 was no small feat. Somehow the engineers at VTW manage to squeeze out 18kW of power from a 2 cylinder engine. Because of this engineering marvel, this high-performing diesel generator remains as whisper quiet and utterly motionless as its small variants. Weighing in at over 500 pounds, it’s obvious that this is no puny generator. For it to be as quiet and motionless as it is must be a miracle of science.

Key Features:

  • 18kW output at 3600 RPM
  • Dual anti-vibration system
  • Multilayered reinforced glass fiber enclosure padded with sound-dampening foam
  • 2-year warranty

Cost: $12,493

30. VTE PAGURO Low RPM 6500

VTE Paguro 6500

To keep in line with the VTE standards for overall livability of a marine generator, the Paguro Low RPM 6500 added an extra cylinder over its high-speed counterpart, bringing the total to 3 cylinders. 50 and 60 Hz are available from the 1500 and 1800 RPM options. As with all Paguro generators, this model is equipped with an emergency automatic shutdown mechanism and a unique real-time LED monitor with a vivid display so that you can see vital diagnostics at a glance.

Key Features:

  • 1500 and 1800 RPM operation at 50 and 60 Hz
  • Real-time LED monitor with a vivid display
  • Freshwater heat exchanger
  • 2-year warranty

Cost: $11,238

31. VTE PAGURO Low RPM 16500

VTE Paguro 16500

The biggest and best from VTE today, the Paguro Low RPM 16500 is a powerhouse with a 4 cylinder engine that you will never hear run or rattle. The same dual anti-vibration system keeps this high-powered generator from rocking around, and the high-density foam inside of its multilayered glass enclosure will soak up all of the sounds you don’t want to hear. At over 700 pounds this is a heavy machine, but its dimensions remain relatively small and should fit well into any ship that needs a generator of this magnitude.

Key Features:

  • 1500 and 1800 RPM operation at 50 and 60 Hz
  • Real-time LED monitor with a vivid display
  • Freshwater heat exchanger
  • 2-year warranty

Cost: Request Quote

32. Westerbeke 5.5 to 15.0 EDC D-NET
@WesterbekeCorp

Westerbeke 55

Running at an optimal 1800 RPM with a newly designed air intake silencer, the 3 cylinder Westerbeke 5.5 to 15.0 EDC D-NET marine generator is as streamlined as they come. This generator comes in a wide range of power options from 5.5kW to 15kW. Mated with the Westerlink or optional NMEA 2000 databus communication networks, this system allows you to cut out the data cables that link all of your onboard devices. Save money, time, and space with a functional wireless communication network that will have all of your important machinery communicating and sharing data. The advanced Westerlink D-NET gives you all of this information at your fingertips in legible text rather than codes that require a manual to decipher.

Key Features:

  • Westerlink or optional NMEA 2000 communication network compatible
  • Digital display and diagnostics panel
  • Tuned air intake silencer
  • 5-year limited warranty

Cost: Request Quote

33. Westerbeke 7.6 EGTD
@WesterbekeCorp

Westerbeke 76

The Westerbeke 7.6 EGTD provides a belt-driven, 50 amp DC battery charging alternator so that you have access to both AC and DC when you need it. This compact generator with a unique “pancake” design is smaller than many other generators that produce a similar power output. This low RPM model runs quiet and smooth while maintaining moderate power. An optional sound shield is available.

Key Features:

  • 50 amp DC battery charging alternator
  • Compact “pancake” design
  • Low 1800 RPM operation

Cost: Request Quote

Heavy Duty Diesel Powered Generators

34. 6B-CP
@Cummins

6B-CP

Powerful enough for a large yacht or small cruise liner, the 6B-CP from Cummins outputs 74 to 99kW at 380 to 480 voltage. The in-line 6 cylinder turbocharged diesel engine is set with a 12 wire, 3-phase alternator to provide this broad range of outputs. An available multi-station alarm can be configured to work with your ship’s communication system and remote monitors. This marine generator is classifiable for Unmanned Machinery Space (UMS) applications as defined by IACS society rules. World-renowned Cummins equipment can be serviced at ports across the globe.

Key Features:

  • 12 wire, 3-phase alternator to provide this broad range of outputs
  • Available with heat exchanger, keel cooler, or set-mounted radiator
  • Designed specifically for marine applications with an IP23 rating
  • Single bearing close coupled permanent magnet generator provides constant excitation under all conditions

Cost: Request Quote

35. 6C-CP
@Cummins

6C-CP

The Cummins 6C-CP takes performance to another level with 130 to 176kW output at 380 to 480 voltage. For its performance level, this 6 cylinder engine maintains good fuel economy and low maintenance requirements with its efficient design. An optional electronic speed governor can be installed. Likewise, the alternator has integrated anti-condensation heaters and two sets of thermistors to keep it efficient, self-maintaining, and powerful. A single bearing, close coupled permanent magnet generator provides constant excitation under all conditions be it a long haul, cold start, or turbulent waters.

Key Features

  • 12 wire, 3-phase alternator to provide this broad range of outputs
  • Available with heat exchanger, keel cooler, or set-mounted radiator
  • Designed specifically for marine applications with an IP23 rating
  • Dynamically balanced rotors with sealed-for-life ball bearings

Cost: Request Quote

36. CAT C18 SRMP
@CaterpillarInc

CAT C18 SRMP

Producing 260 to 5k5kW is no easy task, but the CAT C18 SRMP gets it done without complaint. Operating at low 1500 and 1800 RPM options, this inline 6 cylinder turbocharged engine runs at low-stress speeds resulting in a smooth and dependable marine generator. A separate circuit aftercooling system runs freshwater through the generator without the risk of seawater mixing in and ruining the equipment. Robust in presence and power, the C18 is an efficient machine that is EPA Tier 3t, IMO II, and EU IWW compliant.

Key Features:

  • Heat exchanger and Keel cooled options for all ratings
  • Separate circuit after-cooled
  • SRMP permanent magnet 12-lead generator

Cost: Request Quote

37. CAT C4.4 ACERT
@CaterpillarInc

CAT C44 Acert

The CAT C4.4 ACERT marine generator is a 4 cylinder, 4 cycle diesel engine outputting between 50 and 105ekW. CAT has put a lot of effort into making this heavy duty marine generator as quiet as can be with an insulated timing case cover, isolated oil pan, redesigned block and crankshaft, and a multiple fuel injection strategy. This generator has improved smoke levels and an advanced fuel and combustion system over previous models, making it one of the most advanced heavy-duty generators available. With hydraulic tappets and a longer-lasting serpentine belt, maintenance on this beast will be at a minimum.

Key Features:

  • Engine mounted heat exchanger with removable tubeBundle
  • Open Crankcase Ventilation system
  • Simplex and Duplex Fuel options
  • Anti-vibration isolators between base and engine-generator

Cost: Request Quote

38. Fischer Panda Custom Generators
@FischerPandaUSA

Fischer Panda Custom

For power needs between 30kW and 100kW, Fischer Panda will build you a custom marine generator utilizing engine from respectable suppliers such as Mercedes, Cummins, Perkins, and John Deere. Available in just about any combination of voltages and frequencies in aluminum or steel enclosures, Fischer Panda custom generators are built to suit your needs.

Key Features:

  • Custom power output and design
  • Multiple engine options from a variety of brands
  • Built to suit specific needs

Cost: Custom

39. K19-CP
@Cummins

K19-CP

They keep getting stronger from Cummins. This K19-CP produces 335 to 460kW from its inline 6 cylinder turbocharged diesel engine and is available in heat exchanger or keel cooled configurations. There isn’t much difference from less-powerful heavy duty Cummins marine generators other than the increased power output, but this model is fitted with a superior aluminum wiring harness and duplex filtration.

Key Features:

  • 12 wire, 3-phase alternator to provide this broad range of outputs
  • Available with heat exchanger, keel cooler, or set-mounted radiator
  • Designed specifically for marine applications with an IP23 rating
  • Single bearing close coupled permanent magnet generator provides constant excitation under all conditions

Cost: Request Quote

40. K38-CP
@Cummins

K38-CP

The hefty 12 cylinder turbocharged diesel engine of this K38-CP Cummins marine generator outputs 764 to 920kW of high-quality power. Cummins advertises that this generator was “engineered for the tough demands of the marine environment with superior durability and high uptime requirements.” The overall weight of this generator is over 18,000 pounds. We’re in cargo ship territory now.

Key Features:

  • Designed specifically for marine applications with an IP23 rating
  • 6 wire, 3-phase alternator provides a broad range of re-connectable outputs
  • Available in heat exchanger or keel cooled configurations
  • Integrated anti-condensation heaters and two sets of RTDs

Cost: Request Quote

41. K50-CP
@Cummins

K50-CP

So large, so much in charge, Cummins couldn’t even provide a picture of this mechanical powerhouse. The K50-CP from Cummins weighs over 21,000 pounds and outputs a tremendous 1050 to 1240kW of energy. This powerful machine is backed by a comprehensive warranty that applies globally, because whatever ship this generator is on will surely be traversing the world’s oceans. There are few people in this world that would ever see a marine generator of this magnitude in person, but if you’re interested in ultra-high performing marine generators, this one should be at the top of your list.

Key Features:

  • Designed specifically for marine applications with an IP23 rating
  • 6 wire, 3-phase alternator provides a broad range of re-connectable outputs
  • Available in heat exchanger or keel cooled configurations
  • Integrated anti-condensation heaters and two sets of RTDs
  • Classifiable for Unmanned Machinery Space (UMS) applications as defined by IACS society rules

Cost: Request Quote

42. KOHLER 24 EKOZD
@KOHLERPower

KOHLER 24EKOD

We’re taking a big leap down in power from those ultra-powerful marine generators to something a little more practical. The KOHLER 24 EKOZD won’t power a cargo barge, but we’d still class it as a heavy duty marine generator for the average boat enthusiast. The 24kW this 4 cylinder engine produces is adequate for most yachts and small commercial boats. It still weighs close to a thousand pounds, to give you an idea of its size. This generator will provide ample auxiliary power for most pleasure boats, and it can work well for some Hybrid Electric Propulsion vessels.

Key Features:

  • Voltage regulation of plus 1.0%
  • Copper windings ensure minimal heat buildup
  • Electric fuel lift pump

Cost: Request Quote

43. KOHLER 40 EKOZD
@KOHLERPower

KOHLER 40EKOD

A powerful marine generator quite capable for most any personal watercraft, the KOHLER 40 EKOZD produces 40kW of power and weighs over 1,200 pounds. This model’s copper windings are impregnated with epoxy varnish to prevent corrosion and extended the life of the wiring. Options include a sound shield, multiple voltage choices, and a 3 phase alternative.

Key Features:

  • Voltage regulation of plus 1.0%
  • Copper windings ensure minimal heat buildup
  • Multi-voltage adjustability

Cost: Request Quote

44. Mase Mariner 4200 T

MASE Mariner 4200 T

Fitted with a 4 cylinder, 4 stroke John Deere engine, the Mase Mariner 4200 T is a heavy duty diesel marine generator capable of 42.5kW output over a 3 phase range. Mase is proud of their generator’s reputation for extremely low emissions and unobtrusive design. A cupronickel heat exchanger moves heat between coolant and seawater. This is all housed under a soundproof shell fitted with centrally-located control options to provide you with easy to access controls in a low-stress environment.

Key Features:

  • Synchronous, 4 poles, brushless self-excited, electronic voltage regulator
  • Soundproof frame
  • Cupronickel heat exchanger

Cost: Request Quote

45. Next Gen KEEL Cooled

Next Gen KEEL

Through a 3 phase electrical output at a buttery 1800 RPM, the Nex Gen KEEL Cooled marine generator is designed to be the “most rugged” commercial marine generator on the market. Capable of producing up to 27kW of power from a unique 5 cylinder engine, these generators will fit well on a large range of watercraft, from small boats to large yachts and commercial ships. This generator looks as rugged as the company claims it is, and options like steel skids and harness upgrades go a long way to making you believe in its fortitude.

Key Features:

  • Brushless generator w/marine grade epoxy coated windings
  • Severe duty Kubota gen-set governed engine with a full 3-year warranty
  • Military spec. vibration isolators

Cost: Request Quote

46. Northern Lights 20/16 KW
@nlmarine

Northern Lights Low RPM 2016

This Northern Lights 20/16 kW marine generator may be the bottom of the barrel in respect to power for “heavy duty” generators, but it is no slouch. This highly refined piece of engineering is more than capable for most boats on the water today and will power all auxiliary needs for most recreational boaters out there. This 4 cylinder, liquid cooled, naturally aspirated engine is stylish. You won’t want to put a cover over it, and it’s quiet enough that you likely won’t have to.

Key Features:

  • Gear driven seawater pump
  • DC system uses reliable relays instead of a circuit board
  • Cast iron one-piece expansion tank, heat exchanger, and exhaust manifold

Cost: Request Quote

47. Northern Lights 38/32 KW
@nlmarine

Northern Lights 3832

Cast aluminum paired with induction-hardened carbon-steel, these are specifications not yet mentioned on this list because they are so rare, but that’s what you get on the Northern Lights 38/32 KW. Carbon-steel is stronger than cast iron, which is why Northern Lights decided to use it in vital parts such as the crankshaft. Aluminum is light, which is why exterior manifolds consist of it. This 3 phase marine generator is very powerful and perfected in many ways that most generators simply are not. This generator is about as powerful as anyone would ever need, and it’s as refined as can be.

Key Features:

  • Self-venting fuel system features an inline injection pump
  • The bronze and stainless steel seawater pump with rubber impeller is gear driven, eliminating a potential failure point
  • Cast aluminum and carbon-steel

Cost: Request Quote

48. Northern Lights Deck Mounted
@nlmarine

Northern Lights Deck Mounted

Fully customizable, the Northern Lights Deck Mounted marine generators can be built to your specifications with the quality of parts and assembly Northern Lights puts into their flagship products. Regardless of your need, Northern Lights ensures that your custom generator will be made with easily replaceable parts and be constructed so that you can easily access all frequented maintenance points.

Key Features:

  • Fully customizable
  • Radiator-cooled performance
  • Northern Lights-quality parts and assembly

Cost: Custom

49. Northern Lights Low RPM 20/16 KW
@nlmarine

Northern Lights 2016

Perhaps the most efficient diesel fueled marine generator on the market today, the Northern Lights Low RPM 20/16 KW takes the company’s famous top-of-the-line refinement to the highest level. Low RPM engines are known to run smooth, quiet, and last much longer than their high RPM variants. This is like the reliable Toyota engine of the boating world. The cast iron block will last forever, especially at 1800 RPMs, and the easy to use spin-on filters make maintenance as easy as can be. With this generator, you get reliability through the refinement of simplicity.

Key Features:

  • Swirl combustion chambers provide fuel efficiency and reduce smoke
  • Spin-on oil and air filters
  • Cast iron block
  • Low 1800 RPM longevity

Cost: Request Quote

50. Onan Marine QD 40-99 kW
@Cummins

Onan Marine 40

This is the most powerful Cummins model aside from the models meant for marine applications with an IP23 rating (in other words, those meant for really big ships). The Onana Marine 40-99 kW is an absolute beast in its own right, especially for a 4 cylinder, 4 stroke engine. Cummins is the worldwide king of user-friendliness, so if you have a big yacht that you love to take cruising around the world, this may be your top choice. Your Cummins warranty and customer assistant guarantee will be effective no matter where you roam.

Key Features:

  • Standard SAE J-1939 CAN data link for monitoring generator set status and diagnostics for engine and alternator
  • Worldwide customer support
  • High-pressure common rail fuel system, and many other common parts

Cost: Request Quote

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