Generac Generator Fuel Consumption Chart & Calculator – All Models

Last Updated on May 23, 2024 by Dan Campbell

I recently wrote an article about the importance of having a backup generator for your home in case your power goes out and you need an alternative source of energy. Sometimes Solar won’t do the trick either, and that’s where your backup generator comes into play. Some people can get by with a small portable gas or propane generator, however, for those with large homes that use more power and want to rely on natural gas/propane, Generac Generators are a great option.

Generac Generators

Whether you’re off-grid or in the middle of suburbia, a backup generator will give you peace of mind. And if you’re debating on whether to choose a Generac generator, I recently wrote an article on the pros and cons of propane generators. The great option with Generac generators is they commonly run on both natural gas and propane, so you have the added benefit of using natural gas which most hybrid generators do not offer. Make sure to also check out my posts on the pros and cons of both gasoline generators, and diesel generators.

Now when choosing a Generac generator, you’ll also need to account for how many Watts you need output as well as the size of fuel source you have available, especially if you’re connecting to an off-grid propane tank. I’ve gone ahead and created this table listing all Generac Generators and their models while showing the amount of fuel consumed whether using natural gas or propane.

Generac generators come in many sizes, and depending on your needs you may opt for a smaller or larger size. The smaller sizes are typically the Generac 7.5kw generators to Generac 14kw generator models. For most homes however, you’ll be choosing on of the more common sizes, such as the Generac 18kw generators, Generac 22kw generators, Generac 24kw generators, and Generac 26kw generator models. And for the most demanding situations, you’ll be looking at the larger sizes which range all the way from the Generac 30kw generators to Generac 150kw generators.

In my Generac fuel consumption chart below, I decided not to include Generac Generators that run on Diesel as they seem more targeted towards commercial use, and I don’t know many homes that have Diesel tanks large enough to keep these running.

How Much Propane Does A Generac Use?

The Generac fuel consumption chart below will help you figure out what size generator can be the most efficient for you. Depending on what size home you have, and what size propane tank you have, you might want a smaller or larger generator. Fuel consumption for Generac generators can range from 0.87 gallons of propane per hour to 3.63 for common household sized generators. The most common Generac generator size houses will use is one of the Generac 26kw models.

The Guardian 26kW Home Backup Generator running at 50% load will consume 2.06 gallons of propane per hour. A house with a 500 gallon tank can run for around 8 days uninterrupted at 50% load, or 5 days at 100% load.

To help you calculate all options, you can choose your Generac model below, as well as the load you plan to run at and the size of your propane tank to calculate how long you could theoretically power your home strictly off propane.

If you’re not sure what size generator you need, I recommend checking out my article all about off-grid generators, where I answer how to determine what size generator you need. Even if you don’t plan on using this for off-grid living, the information on what size generator you need will be the same.

Generac Generator Propane Consumption Calculator

Use this calculator to figure out how long your generac propane generator can run for. This information is based on data pulled from model spec sheets, but your specific situation may vary resulting in different results. This information may not be exact, and you should contact Generac if you need exact numbers for your situation.

Due to limited Data, this calculator only shows models with ouputs from 7.5kW-26kW and excludes the Protector Series.

Generac Generator Fuel Consumption Chart By Model

I have pulled all of this information directly from the Generac websites, under each product’s Spec Sheet that they provide. I only made this because they did not have an easily accessible table showcasing all their models together, and may be missing products that have recently been added. Please reach out to me if you find any incorrect or missing information.