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What Size Propane Tank Is Needed For A Standby Generator?


How long will a 100-gallon propane tank run a whole-house generator?

The short answer is that it will work for 3–4 days, depending on energy use. This can vary depending on your home’s energy needs, and your circumstances. However, when you’re only running it for short periods, you can start to notice its impacts on your home. The long answer is that you’ll have to decide how long you want to run it, and what other uses you have for it. The propane tank size does need to be taken into consideration, given that it only holds a hundred gallons of propane.


How long will a 250-gallon propane tank run a whole-house generator?

This is one of those questions that can be asked multiple times before you get an answer. There is no one-size-fits-all solution to this one! Each homeowner will likely have their own energy needs and their own fuel source options. Some may need it for only a few minutes to power, say, a well. Others to power everything in a home. Obviously, a 250-gallon tank is better than a 100- gallon. It is due to the fact that no one is ever sure how soon grid power will come back on.

The general rule is that, depending on energy use, it should last about one week based on 36 gallons a day. Every generator manufacturer will be different in propane per hour fuel consumption.


How long will a 500-gallon propane tank run a 20 KW generator?

This is the most common size propane tank for most users of a standby generator. First, it’s important to make sure that you’re using the correct equipment for the task at hand. In this example, you’re trying to generate enough power to light an entire house. If you’re running a 500-gallon propane tank for a 20 kW generator, you will have to enough fuel to last around a month, based on a 36 gallon per day consumption. Each generator manufacturer will vary. We always tell folks to run the generator for awhile to get water, power the fridge, etc., then give it a break.


Cummins RS17A - 17kW Quiet Connect™ Series Home Standby Generator

Tips To Choose The Right Propane Tank For A standby Generator

If you’re running the wrong propane generator, you’re in trouble. The best propane tank for a standby generator is one that can help you generate enough power to light your entire house. However, you will have to decide what size propane tank you would like to get. There are a few factors to keep in mind before deciding on a propane tank for a standby generator. It’s important to research the tank type that you are going to buy. We always say to plan for the worst. Meaning you never know how soon the grid can be restored, so it is recommended that you have a 500-gallon tank or bigger for a whole home generator.

Larger propane tanks are sort of like insurance; you will not be to worried about running out of fuel. But  larger generators do consume more fuel, depending on the outage. You will always need to keep in mind your supply of fuel.



Having a backup generator at home is never a bad thing for powering your home. The size of the generator will also be determined by the home’s square footage. Also, what things need to be powered up for the home in an emergency situation, such as a power outage.

Now that you have some ideas of what type and size generator you should get, it’s time to look at your options. There are certain things that every homeowner can living with a little more equipment than they had when they last bought their homes. A standby generator is an invaluable piece of equipment in any home energy management plan. It’s perfect for people who don’t have the time or energy to build their own; generating electricity from natural gas or propane is simple and quick. All you need is an electrical outlet and a couple of tanks of storage fuel! In this article, we will discuss the different types of generators and why you should choose one over another.

What Does A Whole House Generator Cost?
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