Portable diesel generator

Review and buying guide.

Portable generators are excellent power backups during emergencies and traveling. They have become an important household item in recent times due to their use and efficiency. Portable generators are the solution for temporary power backup and can be used during blackouts. Portable generators are considered investments rather than luxury products. They come in handy during various situations. Various types of portable generators power through various fuels. There are portable solar generators, gas, propane and dual fuel generators and diesel generators. Each has its fair share of pros and cons, and each works well in its way. 

The advantage of portable diesel generators is that they are fuel-efficient and will get a longer running time. Besides, diesel is more affordable than other fuels. But is every portable diesel generator reliable? No. Some generators emit high-level pollutants and are noisy. So how to select the best from the worst? Don't worry. Our research team has weeded out the dull and out of fashion generators and selected the best ones in the market right now. Below, we have listed the best portable diesel generators of 2021. These generators are efficient, reliable and worth every penny.

Best portable diesel generator:

  1. Generac 6864, Diesel Powered Portable Generator
  2. DuroStar DS7000Q 6,500 Watt Enclosed Portable Diesel Generator
  3. Cummins Onan Quiet Series RV QD10000

1. Generac 6864, Diesel Powered Portable Generator

Brand Item dimension Item weight Wattage
Generac 33.1 x 22.5 x 25.6 inches 254 Pounds 5000 watts

Generac 6864generator has a 1.25inch thick steel frame which protects the interior and gives the generator a good finish. It has Yanmar LW series 435aa air-cooled direct injection diesel engine. The quality of the engines is an industrial grade, and thus the generator is powerful and efficient. Diesel generators are easy to maintain, use and have a long life. It is equipped with true power technology, which gives you clean power for your electronics and home appliances. 

It has a single touch electric start at the back which easily switches on the generator. You can select the voltage between V or 240V, and it also has an hour meter at the back. It weighs around 254 pounds, so you might need some assistance while installing them. We recommend you get a generator wheeler to easily move them around. You don't get a battery with this generator, and you have to purchase them separately. These generators might produce some noise as they are diesel-powered but do not disturb you or your neighbors. 

Why we love Generac 6864, Diesel Powered Portable Generator:

  1. This generator has less harmonic distraction (6% total). 
  2. It has a large fuel tank and is easy to maintain. 

Bestseller (lists)

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

  • Durable, fully welded 1 1/4" steel frame
  • Yanmar LW Series 435cc air-cooled direct injection, industrial-grade diesel engine
  • Diesel power requires less maintenance, is more efficient, and provides a long life
  • True Power Technology provides less than 5% total harmonic distortion for clean, smooth operation of sensitive electronics, tools and appliances
  • True Power Technology provides less than 5% total harmonic distortion for clean, smooth operation of ... Read More

2. DuroStar DS7000Q 6,500 Watt Enclosed Portable Diesel Generator

Brand Item dimension Item weight Wattage
DuroStar 37.8 x 22 x 30.3 inches 305 Pounds 6500 watts

Durostar generators are ideal for farms, apartments and sometimes even on construction sites. This Durostar DS7000Q portable diesel generator has a four-stroke single-cylinder direct injection diesel engine which is highly efficient and gives you clean energy. It also has a remote and electric start which easily starts the generator. The maximum capacity of this generator is 3.8 gallons, and they are dependable on emergencies, and they are easy to maintain them too. 

It has useful features like a full power panel with keyed ignition, voltmeter, low fuel indicator and auto shutdown during low oil pressure. It can run at 6000 peak watts and 5500constant watts. This generator can run for about 12 hours at half an impressive load. It also has a super quiet muffler for the engine, which reduces the engine's noise so that your neighbors do not get disturbed. It is heavy, and you need some assistance while installing them. 

Why we love DuroStar DS7000Q 6,500 Watt Enclosed Portable Diesel Generator:

  1. Easy to maintain and has a 3.8-gallon tank. 
  2. It has auto-shutoff during low oil pressure and low fuel indicator. 

Bestseller (lists)

DuroStar DS7000Q 6, 500 Watt Enclosed Portable Diesel Generator, Black/Red Garden & Outdoor

  • Dependable DuroStar 4-stroke single-cylinder direct Injection diesel engine with remote start and/or electric start for easy use
  • Dependable, maintenance-free Alternator with automatic voltage regulator; FUEL TANK CAPACITY (GASOLINE): 3.8 GALLONS
  • Full-power panel with keyed ignition, oil alert automatic shutdown for low oil pressure, volt meter, circuit breakers, low fuel indicator and power outlets
  • Fully protected 12-Volt, 120-volt and 220-volt outlets. Ground faul... Read More

3. Cummins Onan Quiet Series RV QD10000

Brand Item dimension Item weight Wattage
Cummins  42 x 25 x 27 750 pounds 10000

Cummins Onan generator is specially designed for people who often travel and need a constant generator in their RV. It has a 10000 peak wattage and 8000 running wattage, making it a suitable generator for home use. You need to attach a separate fuel tank to run the generator as they do not come with one. On average running, it uses 4.3 gallons of diesel per hour. The best thing about this generator is that it is loaded with advanced features to self-analyze the problem and resolve it. This makes the generator easy to maintain and highly efficient. 

With the addition of a muffler and casing, the noise level of this generator is reduced dramatically, and it meets the US national park sound requirements. It also complies with the EPA and CARB rules, so you are free to use this generator on an RV anywhere in the USA. While most generators have an electric start, it takes the game ahead and comes with a remote start feature. Weighing around 750 pounds, this generator needs extra help for portability. If you plan for a long trip around the State, this generator gets you covered as it has a high power supply and backs you up during emergencies.  

Why we love Cummins Onan Quiet Series RV QD10000

  1. It has less than 70 decibel sounds. 
  2. It has a remote start feature. 

Bestseller (lists)

10KW Cummins RV QD 10000 10.0HDKCA-11506 83/42A Diesel Automotive

  • Cummins Onan QD 10.0 Diesel RV Generator | 10.0HDKCA-11506
  • Wattage - 10000 watts
  • ... Read More


Generators are great for emergencies and power outages. So selecting the right generator is an important task. Our list has some of the best portable diesel generators that are efficient and less noisy. For more portable generators, check out our article on the best portable generators.


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