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Old 07-27-2018, 05:31 PM   #12
camperguy99
Senior Member
 
Brand: Thor Motor Coach
Model: Thor Tuscany 40DX
State: Colorado
Posts: 121
THOR #5043
Lets see. My residential unit draws 108 watts continuously. that takes about 10 amps out of the 12V batteries. So with 24 hours required that takes 240 amp hours out of the batteries. But the sun only shines at full strength for say 8 hours at most a day. Thus you need around 30 amps for the solar to provide enough to bring the batteries back. You have other loads and the efficiency of the batteries in charging to account for. I have 4 180 watt panels (720 watts) and a 40 amp MPPT charge controller that will put out a bit more than the 30 amps required. Save your money, a small starter solar farm will not come close to meeting your needs. Your solar farm may be better or worse?
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