Two group 24's should last the weekend assuming minimal 12V usage. Lights are a big consumer of 12V, but the killer is the 12V fan in the furnace. If you plan to run the furnace you will run out of battery the first night.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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