PowerMax
An RV converter changes 120V campground power into 12V power for lights and pumps and charges the house battery. If your current converter works and suits your batteries, you do not need a new one.
RV owners replacing a failed converter or changing battery type.
PowerMax PM4-55A 55A Deck Mount RV Converter Charger Lithium (ASIN B01ER3LH1G). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B01ER3LH1G).
Fine print: The Dude has not personally tested this product. The details on this page come from the Amazon listing and can change; check the listing for the current specs, price and availability.