To keep my Xantrex battery topped off, I added a cheapo solar panel from Harbor Freight on top of the tounge box. The directions stated you could add a bead of silicone on the top of the solar panel where the glass meets the plastic housing in order to water proof it. I ran the wiring inside the box and it plugs into the 12V cigarette lighter outlet in the Xantrex unit.
I bought a blocking diode on ebay to keep the solar panel from working in reverse at night and discharging the battery.
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