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The furnace will draw down normal battery/s in one night if it runs a lot. Which brings us to batteries. If the dealer stuck in two group 24 12vdc batteries, you don't have enough capacity. If you want to off grid it using furnace, then best to have four six volt Trojans wired in series and parallel for 400 plus amp hours of capacity...which you do not want to draw down to 200 amp hrs remaining. The more amp hrs of capacity, the better.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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