The Generac GP5500 5939 is part of the Generators test program at Consumer ... Tanks for propane-powered portables are the 20-lb. size. Stationary models are fueled externally from a fixed propane ...

Our average of how long a generator ran, over various loads, on a 250-gallon propane tank for stationary models. The Generac 7224 is part of the Generators test program at Consumer Reports.