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As for lasting overnite on batteries, it depends. If you are in cold temps and the furnace runs all night, maybe not. The furnace pulls around 10 amps per hour when running. In cold temps my unit runs about 70-80% of the night. So from 8 pm. to 6 am. is 10 hours. So on average of 75%, you use 7.5 amps per hour times 10 hours is 75 ah. Assuming a full charge at 8pm, you will probably make it, but if it isn't fully charged it is touch and go.
Edit: you can guess how I know this!
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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