Huntindog wrote:
There are more BTUs in gas than there is in propane.
Propane generators don't produce as much power as gasoline ones... That means less power to run the AC.
I also am skeptical of 20# of propane being the equivalent of 5 gallons of gas, for the same reason.
Propane as a generator fuel really only has one benefit.
No carburetor to gum up in storage.
"What is the fuel consumption of the generators on propane or natural gas?
This is the top question. The simplest answer is that the generators typically use about the same amount of propane(92,000 btu) as they do gasoline; gallon to gallon. For natural gas one therm (100,000 btu) is about one gallon of gasoline (110,000 btu). The biggest mistake most "experts" make in opinionating that a propane or natural gas generator will lose power is based solely on these figures and not on any data they personally have. When figuring power output of any fuel, the size of the engine has to be a significant factor of the equation. For instance, comparing a vehicle with a V8 engine to a generator with an 11hp generator attached can not be calculated the same. This topic is covered in detail on the Fuel Consumption page. Use the link on the left side of the page to access this further information."
http://www.yamaha-propane-natural-gas-generators.com/faq's.htm