A 5500-watt generator is one of the most popular and versatile choices for both residential and commercial purposes. But how long can it run on a tank of gas?

It is difficult to give a precise answer to this question as the amount of time can vary depending on a number of factors, including the size of the fuel tank, the load on the generator, and the efficiency of the generator.

Generally speaking, a 5500-watt generator with a 20-gallon fuel tank should be able to run for about 10-12 hours at half load (2750 watts).

This article will examine how long a 5500-watt generator can run on a tank of gas, as well as provide helpful tips for making sure it lasts as long as possible.

How Long Will a 5500 Watt Generator Run on a Tank of Gas?

The running time of a 5500-Watt generator on a tank of gas can vary a bit depending on how much load you put on the generator as well as the size of the tank.

To break it down for you, a higher load means that higher power is produced by the generator. Thus, the runtime will be decreased.

Generally, a 5500-Watt generator at the half load will run for about 11 to 13 hours on a tank of gas.

Gas tanks are usually about 5 gallons, so if you were wondering how long will a 5500-watt generator run on 5 gallons of gas, the answer is around 12 hours.

Letting Your Generator Run Continuously All Night:

Since you will be able to run a 5500 Watt generator for approximately 12 hours on a tank of gas, you may think of letting the generator run for the whole night continuously

Although this is something that is very much possible, we would suggest you turn your generator for a bit to let it cool down for safety reasons.

Another thing you might want to keep in mind when letting your generator run overnight is its Carbon Monoxide emission.

One last thing we must tell you about leaving your generator all night is that the noise will be an annoyance when you are trying to fall asleep.


Generators for Household Use:

If you are living in a standard-sized family apartment, for context 2000 square feet, you must be wondering how much is a generator for a 2000 square feet house.

To be fair, using the size of your house is not the right way to estimate what generator you will need; it actually depends on the power of the devices you will be using with the power produced by the generator.

Just for a rough estimate, a house of 2000 sq. ft. can be powered by an 11kW generator if only the essential appliances are powered.

However, if one wishes to power all their appliances, a 25kW generator would certainly be a better option.

Running Generators on Propane:

Using propane tanks for your generator can actually come with a few perks. The first one is that you can use propane generators continuously for a longer time than gasoline-run generators without bringing up any issues.

Interestingly, you can connect tanks of propane in series with your generator, so when one tank is empty, the generator doesn’t have to stop operating even for a moment.

Now, let us address the real concern: how long will a generator run on 5 gallons of propane? Well, again, as we saw with gasoline-run generators, this duration depends on the load on the generator.

However, if we were to give a rough estimate, we would say that you would get around 10 hours of power from 5 gallons of propane.

How Can I Make A 5500 Watt Generator Run for Longer?

There are several steps that the user can take to ensure that the generator runs for a longer period of time to minimize the cost and maximize efficiency.

Use The Generator at A Lower Load:

One of the most effective ways to make a generator run for longer is to use it at a lower load. This means using fewer appliances or devices that draw power from the generator.

For example, if you are running several appliances that draw a total of 5500 watts, try turning off one or two of them to reduce the load on the generator. This will allow it to run for longer on a tank of gas.

Use A Larger Fuel Tank:

If you have a generator with a small fuel tank, you may want to consider upgrading to a larger fuel tank.

This will allow you to store more fuel and run the generator for longer periods of time without having to stop and refill the tank.

Use A Fuel Stabilizer:

Fuel stabilizers can help extend the shelf life of gasoline, which can help your generator run for longer.

By adding a fuel stabilizer to your generator’s fuel tank, you can help prevent the fuel from breaking down and going bad, which can cause the generator to run poorly or not start at all.

Perform Regular Maintenance:

Keeping your generator well-maintained can also help extend its runtime. This includes regular oil changes, replacing spark plugs, and cleaning the air filter.

By performing these tasks on a regular basis, you can help ensure that your generator is running at its optimal performance level, which can help it run for longer.

Use A More Efficient Generator:

Finally, if you are looking to make your generator run for longer, you may want to consider investing in a more efficient model.

Some generators are more efficient than others, which means they use less fuel to generate the same amount of power. By choosing a more efficient generator, you can help extend its runtime.

In summary, by using the generator at a lower load, upgrading to a larger fuel tank, performing regular maintenance, and choosing a more efficient model, you can ensure that your generator is running efficiently and effectively for as long as possible.


In conclusion, a 5500-watt generator is a popular and versatile choice for both residential and commercial use. On average, it can run for about 10 hours on a single tank of gas.

However, this can vary depending on several factors. Fortunately, there are ways to ensure your generator is running at its peak performance, such as regular maintenance and using fuel stabilizers.

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