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Best Silent Diesel Generator Reviews - Our Top 6!

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Generators are powerful pieces of equipment that can supply and distribute electricity to all of your electrical appliances at once, depending on their power rating and the number of electrical appliances you have in your home.

Diesel, natural gas, and liquid propane are all suitable for use in these generators. Diesel generators are equally effective as other types of generators in terms of energy production, but they require less maintenance and last longer.

The Pros and Cons of Diesel-Powered Generators

Diesel generators require almost no maintenance. This is because diesel generators don't have ignition components like carburetors and spark plugs.

By doing this, you won't have to worry about replacing spark plugs or restoring the carburetor. One of the most important aspects of maintaining a diesel generator is changing the oil on a regular basis.

Diesel generators, when compared to gasoline generators, have a longer lifespan even when both are used continuously. They perform as well as gas generators yet consume less fuel. 

The lifespan of a diesel generator is far greater than that of a gasoline generator. The typical lifespan of a gasoline generator is 1000 hours or more. A diesel generator, on the other hand, can usually operate for 30,000 hours before requiring major maintenance. 

In addition, diesel fuel may be stored more easily than gasoline. While it is flammable, the danger is far lower than with explosive gasoline. In actuality, one of the biggest drawbacks of diesel as a fuel is that the exhaust of the diesel engine is more noticeable.

Diesel systems may be relatively noisy, which is regarded as one of their main downsides. This is among the many reasons why homeowners choose gasoline-powered generators. With the gasoline generator being so much quieter than the diesel alternative, there is no need to place it in a remote location away from people's homes. 

The initial expenditures linked to installing the diesel generator should also be taken into account. This is typically much higher than the generator powered by gasoline. In contrast, when looking at the cost over a longer period of time, it is obvious that the diesel generator is the more cost-effective option.

When it comes to diesel generators, which features are essential?

As was previously mentioned, diesel generators are similar to other types of generators in many ways but here's what should you look out for:

  1. How powerful is it
  2. What is the fuel consumption like
  3. Noise level
  4. Does it protect delicate electrical goods
  5. Size
  6. Warranty

Best Silent Diesel Generators

Whilst no generator is truly silent, some are more silent than others if you know what I mean. Diesel Generators in the past have been known to be dirty and noisy, but as with all new generators there has been great advancements in making Diesel Generators less noisy.

They are generally still noisier than Gas Generators but that is just like how a Diesel Car is noisier than a Gas Car. The best silent diesel generators I recommend below, are all diesel generators that are quieter than average for the size they are. So, they are as silent as you can get:

Cummins Onan Quiet Series RV QD10000

This high-capacity diesel generator is made for recreational vehicles and can run three air conditioners at once. Due to its 8000 watts of operational energy and 10,000 watts of surge capacity, this model is also an excellent option for a home standby generator.

There is no fuel source within the frame, thus a separate fuel tank must be installed in order to get the engine running. Bear in mind that its hourly diesel consumption is 0.43 gallons at a 50% load.

This model is technologically advanced since it produces a clean sine wave, has variable speeds that are controlled by a computer, and has an onboard microprocessor that can diagnose and fix any issues. These characteristics may help you obtain a low-maintenance, high-efficiency diesel generator.

The manufacturer took great care to include several noise-canceling components, such as a muffler, casing, and enclosed cooling system, which together bring the rated noise state down to 70 decibels and meet the US National Park (UNP) sound criteria.

The Environmental Protection Agency and the California Agency for Resource Management both approve of this design, so you can use your device anywhere in the United States.

For diesel generators, an electrical start is the usual, but this model goes one step further with a remote start. There is a remote engine starter that comes in handy when you're on the other side of the RV.

If you want to use your RV for long road trips or as an emergency standby for your residence, this is an ideal off-grid energy source. It is a better choice for connecting fragile instruments because of its low total harmonic distortion and high output.

Generac 6864 Diesel Powered Portable Generator

Generac 6864, 5000 Running Watts/5500 Starting Watts, Diesel Powered Portable Generator

For its strength and endurance, the Generac 6864 Diesel Powered Portable Generator stands out. With its 12-gallon fuel tank and 5,500 initial watts, it can operate for over 30 hours. A true workhorse, and the diesel engine gives it the potential for a long life with minimal care.

This 254-pound portable generator from Generac has a lot of bells and whistles, and at first glance, you might wonder how you're going to transport it. Getting the wheel kit is recommended to make things easier.

True Power Technology 435cc industrial-grade engines from Yamaha are distinguished by their air-cooled direct injection and fuel-efficient idle control.

Generac 6864, 5000 Running Watts/5500 Starting Watts, Diesel Powered Portable Generator

Using True Power Technology reduces overall harmonic distortion to less than 6%, making it safer to use sensitive electronics, equipment, and appliances.

There is a pull start on the Generac, however starting it has been noted to be difficult, so a battery method is recommended. The 330 CCA battery will power the electric start with a single touch. 

Your generator will arrive in a sturdy 114-inch steel frame that has been fully welded together for your protection. The generator can be easily transported and secured thanks to the frame's incorporated lifting eye. 

Gillette Gen-Pro GPED-65EK Diesel

This diesel generator is the largest on the market, measuring in at a whopping 48 inches on each of its three dimensions. However, at just 200 pounds, it's the lightest of its kind.

The steel construction and convenient carrying handles make this a breeze to move around. Wheel packs are available for purchase separately and can facilitate movement.

This device is powered by a 9 horsepower, air-cooled, direct-injection Kohler KD420 engine. The 4-gallon gasoline tank should last you for about 10 hours of work at 50% load.

It has 5,500 watts of continuous power and 6,500 watts of surge power. A fuel gauge is used to keep track of how much fuel is left in the tank.

The device can be started either electrically or using a recoil pull starter. There is no option for remote starting.

Four of the outlets are GFCI-protected 15-ampers running on 120V, while the other two are 30Amp twist outlets running on 120V and 50Ampers running on 240V. The control panel includes the circuit breakers, voltmeter, and hour meter.

There is a low oil warning and an automatic shutdown mechanism to keep everything running smoothly and safely. There is also a runtime gauge and other alarm lights to indicate when you should change the oil, the air filter, and perform other routine maintenance on the engine.

This diesel generator, like many other diesel appliances, can go longer without being serviced than its gasoline counterpart can.

These service indicator lights are helpful since they eliminate the need to monitor the system's uptime.

Power that is free of harmful emissions can be provided by Electricity Assist. This exclusive excitation package from Gillette features a power capacitor and wound coils designed to minimize voltage fluctuations.

With a harmonic disruption of less than 6%, this is a good option for a wide range of low-power and sensitive electronics.

Onan 8.0HDKAK 1046 Quiet Diesel Generator

This generator  weighs 420 pounds and costs far more than the norm, but it does provide value for money. 

However, the Onan 8.0HDKAK-1046 Quiet Diesel Generator is our Premium choice. It is equipped with a three-cylinder diesel engine, an intake silencer, and a noise-reducing enclosure that is controlled by a computer.

Therefore, the noise output of this gadget is extremely low, well below the threshold recognised by the National Park Service.

It produces electricity in the form of high-quality sine waves and features an electronic mechanism for adjusting voltage. Other features that set this generator apart from others include the electronic governor that never needs to be adjusted and the bottom air inlet and outlet.

The Onan 8000 includes everything you need, including a spark arrestor approved by the USDA, compliance with California and federal emissions standards, and more.

DuroStar DS7000Q

The DuroStar brand of equipment is often regarded as highly dependable. This single-cylinder, direct-injection, 4-stroke diesel engine is perfect for emergency use when the power goes out.

It has 6,000 burst watts and 5,500 continuous watts. In other words, this gear requires little in the way of training or instruction to use. It can be started either with a standard recoil mechanism or an electric starter that requires no additional tools. Using a remote control to initiate the electric start is technically a third option, making it even more convenient.

The panel has a voltage meter, a low-oil warning light, a low-fuel indicator, circuit breakers, and power outlets. Two 20-amp, 120-volt, 3-prong outlets are offered. These will function with all of your typical home appliances.

For high-powered tools like those used on a farm or construction site, there are two twist-lock outlets: one 120-volt, 30-amp, 3-prong outlet and one 120-volt, 30-amp, 120/240-volt, 4-prong outlet.

Although there are a number of great noise-reduction mechanisms built into this type of diesel generator, it is still quite noisy when compared to non-diesel generators.

The DS7000Q has a very long expected lifetime under normal conditions. At a fifty percent load, it should last for about 12 hours. The fuel capacity of 3.83 gallons is really good. 

It would be tough to move this equipment if it weren't for the wheel pack. Nevertheless, moving this apparatus is made quite simple by the said wheel pack.

Power Products Sigma 7000W

Its 7000-watt peak output and 5500-watt continuous power are more than enough to power several air conditioners at once and all of the key appliances in the house, including the water pump, refrigerator, freezer, and electric stove.

At first glance, the control panel may seem overly complicated; but, upon closer investigation, you will find that everything is in fact fairly straightforward. Two of the twist locks are 20 amps and 120 volts, while the other has a 30 amp capacity and can be switched between 120 and 240 volts.

The control panel also has a voltmeter, low oil warning light, and fuel gauge. An internal fuel tank holds 4 gallons of gas, but an external tank of greater capacity can be connected for longer run times if desired.

Power Products claims that it can run at 50% load for 8 hours, which is decent considering its output. 

This huge generator probably needs two people to move it, but Power Products has included a pulling handle and wheels so that it may still be put to use. Diesel generators have the disadvantage of being bulkier and heavier than their gas-powered counterparts.

The Sigma is notable for being relatively quiet, with a noise rating of 68 dB. This generator's low noise output in relation to the amount of power it delivers is a welcome change from the typically louder diesel engines.

If saving money is your first goal, choose the Sigma, but know that you'll be losing up portability and improved features.

Final thoughts

I hope you found my top 6 best silent diesel generators article useful. Buying a generator can be a large investment, so make sure you are aware of why you are buying one and what you will use it for, before buying it. 

About Tom Bell

Hey, I’m Tom, the owner of Generator Reviews! I built this website to help you get the very most out of your generator and select the correct one for your personal circumstances. This site contains reviews of virtually every generator, detailed buying guides, as well as maintenance advice to help you keep yours in tip-top shape!


Generator.Reviews is an independent review business. I am not affiliated with any manufacturers and do not accept paid reviews. When you buy through my links, I may earn a commission which helps me to maintain this website and keep the reviews coming your way!

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