If you are lucky enough to have access to 110V, use a ($10) trickle charger from Harbor Freight. You probably need one for each battery bank. Our yard would not permit untended 110V connections during Winter storage, so I used to top-up charge 5x8D,2x4D and a Group 31 about once a month. Meant hanging around in the cold watching but considering the cost of replacement, probably time well spent.
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