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How Long Will a Generator Run on Propane?


The propane-powered generator will run on propane until this fuel is exhausted. The average capacity of propane-powered generators is 500-1000 gallons, and they usually burn 2 to 3 gallons per hour. Therefore, a 500-gallon tank will run for a week without stopping, while a 1000 gallon one will operate for two weeks before you refill the tank.

On the other hand, natural gas generators usually run until you switch them off. They always have pressure even in the event of a power outage, and they will operate until the normal power supply is restored.

Additionally, the portable propane generators will need maintenance after being used for 100 hours, but this can vary based on the model. What matters is the amount of oil in the engine which will get depleted after using the generator for 150 to 200 hours.

However, most modern generators switch off after the oil gets depleted to protect the engine from damage. Also, the heat can build up after using the generator beyond its runtime.

Most generators can run optimally for 12-24 hours, but if you’re run it continually beyond a day, it will get damaged permanently. If you live in an area with warm weather, use a fan or ice to cool down the engine.

And if you’re operating the generator at higher wattages, then it will get heated faster.

Why should you use propane in the generator?

Since most generators are in standby mode, they won’t be running most of the time. And if the generator sits for a long time, say 6 months, the gasoline and diesel fuel will accumulate and clog the engine.

Over time, they will damage the fuel lines and rubber seals. Besides, gasoline and diesel fuel can lead to problems when starting the generator in cold weather. But with propane, you will extend the life of the generator engine.

How much Power does Propane-Powered Produces?

The average ratings of the home generators are 7Kw to 20kW. You can do most work at home with the 7Kw generator, such as powering the refrigerator, heating systems, and lighting. But you would need at least 15kW electricity to enjoy the various appliances in your home.

The 7kW generator on a 100-gallon full propane tank will run for about 66 hours. On the other hand, a 12Kw generator will run for 36 hours when on a full tank. Besides, the generator rarely runs at its full capacity, which helps to preserve fuel.

How Long will the Generator Last?

If you maintain your generator well, then it will last for 30 to 40 years. Just like other equipment and appliances, you will need to carry out routine maintenance practices.

Advantages of Propane-Powered Generators

  1. It doesn’t degrade over time
  2. It is available from gas stations and dedicated providers
  3. It is cleaner fuel as it doesn’t produce many pollutants
  4. Spill-free because of their safety valves
  5. It provides more energy per cubic foot

Disadvantages of Propane-Powered Generators

  1. Propane tanks are quite expensive at gas stations
  2. Propane engines have a shorter life expectancy than gasoline and diesel engines


Generators have become an essential appliance both at residential and commercial properties. They have many uses ranging from home lighting to emergencies and powering different appliances. Regularly, you’ll only need to run the generator for a few hours, regular and prolonged power outages will create the need to run the generator for longer.

For the generator that runs on propane, it’s easy to control the fuel tank, and you have other options of fueling the generator continuously. But the easiest method of extending the operating time of the generator is connecting two propane tanks to a single gas line using a changeover regulator.

This enables you to turn one tank on at a time and switch off one when it’s depleted, or when you don’t need it. Therefore, you won’t need to replace the depleted propane tank but instead switch to the next tank using a changeover regulator.

Weather can knock out your electricity anytime, and you’ll therefore need a generator to protect you from inconveniences and potential dangers. Propane-powered generators are efficient, reliable and will provide electricity to serve your needs.

And besides, the generator will run for a long time using this type of fuel. You can also connect the second tank to the main supply line to extend your usage time.

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