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 PM3 75LK RV Power Converter - 12 Volt 75 Amp with 3 Stage Smart Charging Mode, Lithium Compatible (ASIN B00F8MC43Q). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B00F8MC43Q).
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.