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The Original Poster asked a very basic question based on a 100 watt solar panel and I think we overshot the answer by many hundreds of watts. My own solar setup is basic - a single 100 watt solar panel and two golf cart batteries in series.
Since, unfortunately, my RV sits in the storage lot baking in Florida sun way too often, the goal was to keep the batteries charged. This setup, which also ties the engine battery into the charging circuit, keeps my batteries from ever going dead even while keeping certain minor loads connected.
A battery monitor that displays the voltage and current on the batteries is also an excellent investment. It allows you to "see" how much power is being drawn from or put into your battery bank so you can manage things better.
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