Best Diesel Generators (Review & Buying Guide)

A diesel generator (also known as diesel Genset) is the combination of a diesel engine with an electric generator (often an alternator) to generate electrical energy. A diesel compression-ignition engine is usually designed to run on diesel fuel, but some types are adapted for other liquid fuels or natural gas. A diesel generator can be used while power cuts or the places where you may not have a constant power supply. These are portable, so you can carry it anywhere easily.

In this world of expensive fuel, you need a cost-effective replacement for fuel. This diesel generator has proved to be very efficient and cost-effective. Though you may say that diesel prices are higher than gasoline, the mileage given by diesel is more than gasoline. 1 Litre of diesel will be equal to 3 Litres of gasoline, which will obviously save energy and money. The diesel generators are, that’s why, very popular in various industries.

Buying Guide

Manufacturer history

The first thing you should consider is to know about the manufacturer’s history and reputation. It is always a good idea to go with a trusted manufacturer who has a reputation for producing equipment that can fulfill the basic needs. Besides, you should consider whether you will need a standby diesel generator or a dedicated generator. Dedicated generators are used when there are no other power sources on the site, or at sites that require a generator that is in use all day, every day. These are also known as prime or continuous generators. A standby generator on the other hand acts as a backup source to a pre-existing power source.

Noise Level

HPM GENERATOR’s Noise is measured in decibels. When it comes to portable generators it is calculated in terms of ‘dBA’ at a field-specific range. The standard measurement is about 21 feet or 7 meters. The noise level for power generators usually varies between 55dBA to about 85dBA. If you are going to use the generator in your home, less noise level should be considered.

Size and Portability

Based upon your usage design and expected activity of the generator, you will have to make a choice among portability, sizing, and definitely the wattage. The bulkier the generator, the more problematic it will be to move. So, make sure that you evaluate well in advance how often you would need to move it around and keep in mind that too small the size and you lose out on wattage.

Control Systems And Power Management

The ideal control system should offer a variety of features. Many generators are now equipped with Power Management Systems (PMS). What makes them ideally suited for rental applications is the plug-and-play design that allows for easy and rapid configuration. This helps to better utilize the efficiency of the power plant while providing a valuable overview of the application process.

Fuel Efficiency And Autonomy

Today’s mobile generators now consume much less fuel than automobiles from five years ago. Therefore, it is recommended to look at the fuel consumption rate before making an investment.

   Best Portable Quiet Generators Available in 2018    

    How to choose the best quite generator when it comes to wattage capacity and decibel level?   

1) Generac 6864, 5000 running watts/5500 starting watts, diesel-powered portable generator

This Durable and fully welded steel frame generator will surely surprise you.

1) Generac 6864, 5000 running watts/5500 starting watts, diesel-powered portable generator


This diesel-powered portable generator featuring True Power Technology, provides less than 5% total harmonic distortion for the clean, smooth operation of sensitive electronics, tools, and appliances; ideal for the job site.

yamaha ef2000is generator

Features and Benefits

  • Function – Diesel power requires less maintenance and it is more efficient and long-lasting.
  • Technology – The true Power Technology provides less than 5% total Harmon, ic distortion for the clean, smooth operation of sensitive electronics, tools, and appliances. And it’s equipped with an hour meter to track maintenance day-long
  • Structure – It has a single touch electric start for easy start-up, and a durable fully welded 1-1/4″ steel frame to protect the generator in 12-gallon demanding applications.
  • Long-lasting – ideal for day-long events that are the integrated lifting eye for easy transport and security with an idle control to conserve fuel and reduce noise. This helps the 12-gallon fuel tank provide a long run-time of 32.4 hours at 50% load.

Key Specifications

  • Dimension: 33.1 x 22.5 x 25.6 inches
  • Weight: 254 pounds
  • Manufacturer: Generac

Advantages & Disadvantages

  •  Good quality
  • Reliable
  • Long-lasting
  • Uses less power; efficient
  • Durable
  • Easy startup
  • It is comparatively heavier to be able to fall into the category of a portable generator.

yamaha ef2000is generator


2) Cummins Onan quiet series diesel RV generator – 10kW, model number 10HDKCA-11506

This Cummins Onan Quiet Series Diesel RV Generator is a well-designed generator.

Cummins Onan quiet series diesel RV generator - 10kW, model number 10HDKCA-11506


It is built specifically for RVs that provide enough power to run 3 rooftop air conditioners yet is quieter than National Park Service sound level requirements.

Features and Benefits

It features high-quality, pure sine wave electrical output to help prevent damage to appliances. It has a sound control technology to maintain the required noise for national parks (because of the animals). The generator is enough strong to run 3 air conditioners at a time for a longer period.

Key Specifications

Dimension: 42 x 25 x 27 inches

Volts: 120/240

Watts: 10,000

Fuel Type: Diesel

Advantages & Disadvantages

  • Can run 3 rooftop air conditioners
  • Quieter than National Park Service sound level requirements
  • Constant speed operation
  • Digital voltage regulation
  • Hour meter
  • Heavy and difficult to setup.

Resources:Cummins Sales & Services


Make sure you know properly what type of generator you need and for what particular reason you need. Like for industrial or any heavy mechanic use, you don’t need less noise level feature, but if you use them at home, then the noise may disturb you. Also if you are planning to settle the generator at one particular place for the rest of its life, then you can easily go for the heavy generator but for a portable reason, you must go for lightweight generators. Fuel efficiency should be your first priority in any. Always stay on the conservative side and remember that generators are built to work hard and the more accurate the sizing is to the application, the greater the results.

So keeping all these in mind, you can select the required generator for yourself. These are the best diesel generators that we found. Both are from different brands and are specifically made for different uses. According to your preference, you can buy one or search for other such generators.

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