How Long Will a Whole House Generator Run?

how long will whole house generator run

Whole house generators are a popular backup power source that can be used to supply power during outages. They are fueled by natural gas, propane or diesel and can run for several hours or days.

The running time of a generator depends on several factors, including the fuel type and how much power it consumes. Additionally, humidity plays a role in how long it can run.

Natural Gas

A natural gas whole house generator is a standby power system that uses natural gas to run your home when the electricity goes out. It’s a great solution for ensuring that your lights will stay on even during hurricane or blizzard season.

Natural gas is a fossil fuel, which means it formed from the organic matter of plants and animals that grew millions or billions of years ago. It’s made up of 70% to 90% methane (CH4), with trace amounts of ethane, propane, and butane.

Homes and businesses use natural gas for heating, cooking, and power generation. The residential sector accounts for about one-quarter of all natural gas usage in the United States.

Pipelines carry natural gas from production fields to cities and homes throughout the country. Thousands of miles can be traveled, so it is essential that natural gas be delivered to consumers safely and efficiently.

Liquid Propane

When you’re planning for an outage, it’s important to know how long your whole house generator can run on a full tank of fuel. This can vary depending on the type of fuel your generator uses and the size of the tank.

For propane generators, this varies from five to seven days on a large tank. However, the runtime will depend on your location and weather conditions.

Liquid propane is a stable and high-energy fuel that burns cleaner than gasoline or diesel. It also reduces air pollutants and lowers maintenance costs, which can help you save money on your energy bill over time.

A 2,000-watt propane generator can typically run for up to two and a half days on a 500-gallon tank. A larger 4,000-watt generator may last for five or six days.


A diesel generator is an efficient way to generate electricity and it can be used for a variety of different purposes. For example, they are often used to power cell towers and other telecommunication equipment.

They can also be used to provide backup power for homes or businesses. This can help them avoid costly downtime and reduce their stress level in the event of power outages.

Similarly, they can be used to provide fuel for the power grid when it needs it. In the UK, for instance, there is a system called STOR (Short Term Operating Reserve) that allows large power generators to feed power into the power grid at peak periods or in times of high load.

If you want to keep your diesel generator running for as long as possible, make sure it is always fueled and that the oil level is correct. You should also pay for professional servicing on a regular basis to ensure your generator is running as it should be.


The short answer is that the average home generator can run for days on end. Several factors affect a generator’s longevity, including the quality of the components, fuel used and maintenance. Using the right kind of energy and following the manufacturer’s recommendations are key to maximizing your unit’s life span.

The most obvious factor is the amount of energy or fuel supplied to your unit, while other important considerations include how long you want it running and whether you need it at all times. Having a professional service your generator every other year or so will ensure it stays in top notch working order and is prepared to meet the power demands of the next disaster.

One of the most exciting developments in the world of home backup power is a battery operated backup generator. This can be particularly useful when the grid goes down, as it allows you to keep critical electrical items powered up and running until the power company gets things under control.