.

Hereof, how much propane does a whole house generator use per hour?

Most propane tanks, either above or below ground, are 500 to 1,000 gallons. Expect a propane powered generator to burn 2-3 gallons an hour.

how long will a 20 lb propane tank run a generator? 10hp at 50% load would be using 5 horse power to generate 2500 watts of energy. 5hp x 10,000 btu would consume 50,000 btu per hour. Using a 20# cylinder that produces 441,600 total btu, the engine consuming 50,000 btu per hour would run for about 8.8 hours.

In this way, how long will a Generac generator run on propane?

As long as there is a fuel supply of natural gas or propane, a well-maintained backup generator will keep running. If the Generac generator is running on propane, with a 500-gallon tank, it should run 24 hours a day for over a week.

Is it cheaper to run a generator on propane or gas?

Gas generators also put out more heat than propane, about 30 percent more for the same amount of fuel. Unless you live in an area where propane is considerably cheaper than gasoline, a gas generator will typically be cheaper to operate. Unlike propane, gas degrades over time when left in a generator tank.