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With 3 100 watt panels, 4 6V batteries in series/parallel configuration and a Maximum power point charger, I traveled full time form 15 years and never had a power problem. I don't waste electricity, maybe an hour or two of TV then read for another hour or two using LED lighting. In AZ I usually had a full charge by 9AM, anywhere else it was sufficient. You get a fair charge on overcast days but never a full amperage rating. Get a power point type of charge controller, it will give you about 1/3 more amperage which is substantial. No idea of pay back time but the convenience is priceless as they say.
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