Per (PeteCresswell):
Ditto propane from the storage angle.

Oh yeah... and propane doubles as cooking fuel. Dunno how much an
electric stove or electric oven pulls, but if you have those and/or an
electric hot water heater I'd start testing/figuring.

http://powerequipment.honda.com/gene...how-much-power
might be a starter.
--
Pete Cresswell