Sienna -
Be aware that the furnace fan will draw around 3 amps. If it is cold, and the furnace runs more or less continuously, it can use most of your usable battery capacity in a 12-hour night. And if you have other loads - lights, etc - it is possible to wake up in the morning with a cold camper and a dead battery. You can restart the genny, of course, but drawing a battery down to empty is not good for it ...
Bill
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