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Can I safely charge an auxiliary RV battery using the alternator and a solar panel at the same time?

I use an auxiliary battery in a Volkswagen Westfalia camper and, until now, it gets recharged with the alternator when the vehicle is running. I have just installed a 15-watt solar panel on the roof to provide charging when the vehicle is stationary for


I would isolate the solar panel from the battery with diodes to keep any current from the charging system harming it.

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