With one exception, I never turn the inverter on unless on the road to keep the refer running. The one exception is when in storage hooked to regular house current, and the temps will be below freezing. If only slightly below freezing, I have 12 old (get hot) light bulbs scattered around...in the refer, washer, kitchen water lines, etc and have the Aqua Hot winterized. If going to be real cold, 15 or lower, I turn the AH burner and the inverter on. When that cold, I check the power every day, so if the power goes off and the inverter picks up the load, I will know it and the batteries will not run down.
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2014 American Eagle 45T
DD 13, 500 HP
Pulling a Honda CRV
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