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Your furnace uses a lot of battery power to run the blower. One cold night in Canada, about 12 hours, with no electric hook up drained our single deep cycle battery. That was with the refrigerator and water heater on gas. Had to plug the 5'er to the truck and run it for about an hour to get enough charge back in the battery to run the furnace. Needless to say we had electrical hook up the next night.
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2006 3000RK
2009 Ram 2500
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