I read that the furnace is somewhere around 10 amps (maybe 9). And when I boondocked in the mountains it ran about 3/4 of the time. So that is 7 amphours per hour. It gets cold by 8 pm and is still cold at 7 am, so that is 7*11 (at least) amphours. Regular batteries are what, 120AH??? So add in other stuff and I got about 1 day on batteries (I wasn't smart with lights, etc the first time out).
I have yet in 2 attempts lasted more than one day on batteries, but now I have a generator.
