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The television antenna amplifier (in bedroom "walk-in" closet of my 5er) being turned on when rig is on battery power only, is a fairly significant drain on the battery bank that people often forget about. Also check for basement lights left on and forgotten. In hot weather, the reefer fans can draw a lot from the battery as well.
I have run multiple lights (incandescent type) for hours at a time, and furnace for about four hours on 1 battery before it was necessary to charge with generator or plugging in to shore power.
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