We have 3 size 27 batteries and can go for about a day and a half running our fridge through the inverter before getting a low voltage alarm from the inverter module. If the batteries are too low to start the generator, start the engine and it will begin to recharge the batteries. I would think you should be okay overnight.
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Dan S.
2015 Thor Chateau Super C 33SW
F-550 Chassis, 6.7L Powerstroke
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