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That's going to depend on how your rig is set up. First you need to understand that the solar pannels charge the batteries and then the batteries, thru the inverter, powers whatever you have it set up to power. Under no circumstances do you want to run your batteries down to less than 50 percent. That said, on our old rig we had seven pannels, six golf cart batteries and I had it set up so that when we were parked I had a switch in the breaker box I could throw and then the solar powered most things and the shore power powered things like the AC, water heater etc that you don't run on solar anyway. you also need to understand that that setup cost a lot of money and would never pay for it'self. I just set it up that way to get a little of the money back.
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