to ; Jackm
I used a small solar panel in a conversion van to keep batteries charged because I had a 12 volt refrige in use while traveling. We visited disney, Florida many times and panel kept batteries, 2, charged all day, 10, 12 hours. I remember I purchased panel at J. C. Whitnney, but I'm sure they can be purchased elsewhere. I plugged panel into cigarette lighter, now called power outlet.
good luck and hope this info helps---AJBJRVERS