Obvious something is drawing your batteries down pretty quickly while in storage. If you’re using your “store switch” you should be able to store without power for at least several weeks. I got tired of worrying about it so added a small (80W) solar panel and it has been way more than adequate fo keeping my two house batteries and coach battery all topped up. Summers have long sunny days, winter not so much so I probably will add a second panel in the fall. Not sure it’s really needed but certainly can’t hurt either.
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