Marine generators are used on various ships to power everything from small kitchen appliances to electric propulsion systems. When running any critical appliances that consume a good amount of electricity, such as refrigerators, air conditioners, or water heaters, a ship’s battery won’t be sufficient. The best marine generators will effortlessly power electronics and devices without putting stress on the ship’s battery.

Every marine generator is powered by either gas or diesel, and you will need to pick a generator powered by one or another. Most people opt to stay with the same fuel type the ship requires out of convenience, though this is not required. Avoid bringing a normal generator onboard your ship, however. Marine generators are designed to endure harsh marine conditions, whereas a normal generator would fail.  Robust marine generators need maintenance tracking mechanisms.

Below, we have listed 16 of the greatest marine generators in production today, sorted by gasoline, diesel, and heavy-duty diesel categories, so it is easy to identify the most effective marine generators for your requirements.

Gas Powered Generators

1. KOHLER 5 EKD

The KOHLER 5 EKD is a two-cylinder, 4-cycle gasoline-powered generator outfitted with a remote launch 12-pin connector. Smartly designed with maintenance access to key elements from one side, this generator is about to be mounted into a convenient place. An optional audio shield enclosure results in balanced livability. Emissions are EPA-based, and aluminum windings assure minimal heat generation. People who don’t require huge power output from their generator will find this KOHLER 5 EKD to be an efficient workhorse that’s minimally invasive.

Key Features:

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

2. KOHLER 7.5 EKD

A gain in power often correlates with more noise, turbulence, and sophistication, but that is not true with the KOHLER 7.5 EKD. With a 50% rise in kilowatts over its lightweight version, this marine generator has a far stronger power output while keeping an unobtrusive footprint. Connected directly to the engine, this generator comes with sealed precision ball bearings and a steel sleeve to avoid misalignment and enhance the machine’s life.

Key Features:

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

3. Westerbeke 3.5 SBCG

Claiming to be “the quietest, and compact, 3.5kW gas generators accessible,” the Westerbeke 3.5 SBCG adheres to its guns by forgoing a solid shield altogether. Operating a sleek, electronically-controlled 2200 RPM and beginning with multiport electronic fuel injection, there is no question about how Westerbeke maintained this generator so quiet. The 3.5kW output is strong enough to run electronically-thirsty machines like water heaters and air conditioners without fuss, and it weighs less than 200 lbs.

Key Features:

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

4. Westerbeke 5.0 MCGA

Among the most compact, lowest-speed, and lowest-emission gas generators on the marketplace, the Westerbeke 5.0 MCGA is a high-performance generator with a very low profile. In an 1800 RPM run rate, this generator is especially quiet and smooth compared to other 3600 RPM 5kW marine generators. From performance to usability, everything about this generator was designed for efficiency. The butter-smooth 3 cylinder, 4 cycle engine is paired with creature comforts like a one-touch control panel and LED indicator lights, making this a user-friendly marine generator.

Key Features:

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

5. Westerbeke 10.0 SBEG

This houseboat-made Westerbeke 10.0 SBEG is a 4 cylinder, 4 cycle marine generator with an AC circuit breaker, a 50 amp battery charging alternator. It guarantees an exceptionally smooth operation directed to go virtually undetected when operating. Simple operation with a one-touch panel along with the electronically controlled operating system means minimal care is necessary.

Key Features:

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

Diesel Powered Generators

1. CAT C1.5

A respected and reliable brand in most things machines, CAT has produced an extensive line of diesel-powered marine generators that will fulfill anyone’s requirements for auxiliary power. This C1.5 version is one of the smallest editions. Though compact, the C1.5 marine generator generates an impressive 14.5ekW perfect for modest power requirements. 100% block loading capacity starts big power loads effortlessly, 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 since it is smooth. Anti-vibration mounts prevent vibration.

Key Features:

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

2. Fischer Panda AC 8 to 15 Mini

Powered with a freshwater-cooled 3-cylinder diesel motor, the Fischer Panda AC Mini arrives in several power options within 8 and 15kW. A proprietary Voltage Control System ensures stable voltage within +/- 3 volts. This marine generator appears standard with a user-friendly electronic control panel along with a solid shield. Optional accessories include anti-siphon valve vented loops, motor mounts, an exhaust water separator, and a low profile muffler when the muffler cannot be installed lower than the Genset.

Key Features:

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

3. Fischer Panda DC 5000 and 6000

The Fischer Panda DC generators are powered with a flat, water-cooled diesel engine outfitted with a car start/stop system, which will turn on to revive your batteries and shut off when they are complete. A direct driven permanent magnet generator, these DC generators are fuel-efficient and pump out a high-quality current. 12 volts is standard. However, custom voltage is available upon request.

Key Features:

• Available in several voltages and amperage outputs upon request• Panda AGT Generator charges the batteries automatically
• A continual supply of AC voltages for customers through selected electrical inverters

4. Fischer Panda Marine AC 4200 to 6500

A good twin-cylinder motor forces the Fischer Panda AC 4200 to 6500 generators. Similar in reliability and efficiency to the DC version of Fischer Panda generators, the present output solely depends upon your electrical needs. AC or DC, Fischer Panda marine generators produce quality electric currents in their efficient and reliable engines. Each generator includes a 5-year guarantee from the business, ensuring that you will have a top-tier functioning generator for the years ahead.

Key Features:

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

5. GenTec 6000 to 18000

GenTec’s array of marine generators in the 3000 to 3600 RPM range are included in sound-dampening fiberglass enclosures, which have a sleek design and work well to subdue the sound and vibration of the operation. These generators provide a constant output of 4kW and are primed to pump up the power when required. Fit with a new water heat exchanger and an AC water-cooled generator, and this marine generator will remain cool as a cucumber under heavy load and prolonged usage.

Key Features:

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

Heavy-Duty Diesel Powered Generators

1. 6B-CP

Robust sufficient for a big yacht or little cruise liner, the 6B-CP of Cummins outputs 74 to 99kW in 380 to 480 voltages. The inline 6 cylinders turbocharged diesel engine is set with a 12 wire, 3-phase alternator to offer this broad range of outputs. An available multi-station alarm can be set to work with your ship’s communication system and remote monitors. This generator is suitable for Unmanned Machinery Space (UMS) uses according to IACS society laws. World-renowned Cummins tools can be serviced at ports throughout the planet.

Key Features:

• 12 cables, the 3-phase alternator to provide this wide range of outputs
• Available with keel cooler, heat exchanger, or set-mounted radiator
• Made specifically for marine applications with an IP23 Score
• Single posture close-coupled permanent magnet generator Offers continuous excitation under all conditions

2. 6C-CP

The Cummins 6C-CP takes functionality to another level with 130 to 176kW output at 380 to 480 voltages. This 6 cylinder engine keeps good fuel economy for its performance level and reduced maintenance requirements with its efficient design. An optional digital speed governor can be installed. Likewise, the alternator has incorporated anti-condensation heaters and two thermistor collections to keep it efficient, self-maintaining, and strong. A single posture, close coupled permanent magnet generator offers continuous excitation under all conditions, be it a long haul, cold start, or tumultuous waters.

Key Features

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

3. CAT C18 SRMP

Generating 260 to 5k5kW is not a simple task, although the CAT C18 SRMP gets it completed without criticism. Running at low 1500 and 1800 RPM choices, this inline 6 cylinder turbocharged engine operates at low-stress speeds leading to a smooth and reliable marine generator. Another circuit after the aftercooling operation runs freshwater throughout the generator without the possibility of seawater mixing in and destroying the equipment. Robust in power and presence, the C18 is an efficient EPA Tier 3t, IMO II, and EU IWW compliant system.

Key Features:

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

4. CAT C4.4 ACERT

The CAT C4.4 ACERT marine generator is a 4 cylinder, 4 cycle diesel engine outputs between 50 and 105ekW. CAT has put a great deal of work into making this robust marine generator as silent as can be using an insulated timing box cover, isolated oil pan, refurbished block and crankshaft, and multiple fuel injection strategies. This generator has enhanced smoke levels and an advanced fuel and combustion system over previous versions, making it among the most innovative heavy-duty generators out there. With a longer-lasting serpentine belt and hydraulic tappets, upkeep on this monster will be at a minimum.

Key Features:

• Engine mounted heat exchanger with detachable tube bundle
• Open Crankcase Ventilation system
• Simplex and Duplex Fuel Options
• Anti-vibration isolators between foundation and engine-generator

5. Fischer Panda Bespoke Generators

For electricity needs within 30kW and 100kW, Fischer Panda will constitute a custom marine generator with the engine from respectable suppliers like Mercedes, Cummins, Perkins, and John Deere. Offered in virtually any combination of frequencies and voltages in steel or aluminum enclosures, Fischer Panda personalized generators are manufactured to suit your requirements.

Key Features:

• Multiple engine choices from various brands
• Custom power output and layout
• Made to suit specific requirements

6. K19-CP

They keep becoming more powerful from Cummins. This K19-CP generates 335 to 460kW out of its inline 6 cylinders turbocharged diesel engine and can be found in keel cooled or heat exchanger configurations. There is not much difference from less-powerful heavy-duty Cummins marine generators aside from the greater power output. However, this version is fitted using a superior aluminum wiring harness and duplex filtration.

Key Features:

• 12 cables, the 3-phase alternator to provide this wide range of outputs
• Available with keel cooler, heat exchanger, or set-mounted radiator
• Made specifically for marine applications with an IP23 Score
• Single posture close-coupled permanent magnet generator Offers continuous excitation under all conditions