Purpose-built as a direct board replacement for the WF-8955, WF-8955-AD, and Parallax 7145/7155 converter series, this DC main board assembly restores 12V charging to older RV converter housings without replacing the whole unit. It converts 120V AC into a regulated 12V, 14.6V output at up to 55A, with dedicated charging profiles for lead-acid and LiFePO4 batteries plus a fixed-voltage mode offering 13.0V, 14.6V, or 16.5V settings, a good match for medium-capacity 55Ah, 70Ah RV batteries. Multi-stage smart charging protects battery life over repeated cycles, and a temperature-triggered cooling fan works with the metal housing to shed heat during heavier loads. Six protections, short circuit, over-temperature, overload, low voltage, overvoltage, and reverse polarity, along with a 100% copper cable, keep the board running safely. For RV owners whose factory converter board has failed, this swap-in board restores reliable charging without sourcing a discontinued part.