How Many Gallons Per Hour Does a Diesel Generator Burn?

Diesel generators are one of the most popular standby generator options on the market. But how much fuel do they consume? Find out below.

How Much Diesel Does a Generator Use?

Diesel generators are less popular than propane and gasoline generators, but they are more fuel-efficient. 10 kW diesel generators consume about 1 gallon of fuel per hour. 20 kW diesel generators require around 1.6 gallons of fuel per hour. These figures are estimates for moderate-to-heavy loads.

How Long Can a Diesel Generator Run Continuously?

Diesel generators with large tanks can run continuously without refueling for 48-72 hours. Most generators can be refueled while they run, so a diesel generator can run more or less continuously for long periods as long as you refuel it.

In comparison, natural gas (LNG) generators may theoretically operate eternally as long as the gas keeps flowing since they are linked to a home’s natural gas pipes. In reality, the generator needs to be shut down periodically (e.g. every 15-30 days) for basic maintenance, so you wouldn’t normally run a generator without stopping for years.

Calculating the Fuel Efficiency of a Diesel Generator

Subtract the kWh output of the generator from the kWh input value of the fuel. To represent it as a percentage, multiply this number by 100.

How much fuel does a 3.5 kVA generator use?

This video discusses diesel generator fuel consumption:

FAQs About Diesel Generator Fuel

Is it cheaper to run a generator on gas, propane, or diesel?

Because propane generators produce fewer BTUs per gallon of fuel than gas generators, they have a lower overall efficiency. When it comes to the ecology and your generator, propane is a better choice than gasoline.

At $5.76 per gallon of diesel, the cost of running a 10 kW generator is around $138 every 24 hours. Running a 20 kW diesel generator costs about $221 per day.

What is the best rpm for generator fuel efficiency?

Generators running at 1800 RPM, four-pole sets are the most popular and cheapest. They are the quietest, most efficient, most cost-effective, and have the longest engine life.

Why do generators run at 3600 RPM?

A 3600 RPM Diesel generator’s alternator spins twice as quickly as an 1800 RPM alternator, allowing it to use less than half the copper. These 3600 RPM generators have a shorter lifespan due to their increased engine speed.

How much energy does a diesel generator produce?

A diesel generator may provide electricity for $1 to $40 per kWhr, depending on the load factor (BSFC) and fuel cost. The maximum output power is 15 kW. The capacity factor of a solar system is roughly 12 percent, thus a 100 kW system must be bought to generate an average of 12 kW

What load can a 3.5 kVA generator carry?

Electric heaters, microwaves, and televisions are just some of the heavy-duty household appliances that may be powered by a 3,500-watt generator (3.5KvA).

What is the most environmentally friendly generator?

As a greener alternative to traditional generators, wind turbines are able to provide energy during power shortages. As a result of their increased wind speed, storm systems contribute significantly to brownouts and blackouts.

How do you control the speed of a generator?

There are three techniques to regulate the speed: The generator may be used to provide a braking torque (drawing off electrical power). In order to achieve a desired rotational speed depending on a recorded wind speed or another control parameter, the blades may be pitched to varied angles. Retaining a halt to the rotor (emergency stop).

What is the best frequency for servicing to elongate the lifespan of the generator?

The frequency with which a diesel generator should be serviced is determined by the generator’s use and operating duration. A good rule of thumb is to have your generator inspected and serviced every six months or 400 hours of operation, whichever comes first.


While diesel generators can consume fuel at a rapid clip, they are no more or less fuel-efficient than a standard petrol-powered automobile.

The “diesel generator fuel consumption chart in liters” is a good resource to gauge how long your diesel generator will run on a specified amount of fuel. The answer to the question is, on average, about 1 gallon per hour.

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James Sylvester
About James Sylvester

James S. Sylvester is an experienced OSHA Safety Supervisor with years of experience in the construction and oil & gas industries. He focuses on workplace safety, occupational health and safety systems. Learn more about James' background here

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