AC to DC Lower Section Replacement Tray Converter/Battery Charger with Built-in 4 Stage Smart Charger. Unit hard wires into an RV AC and DC Power Distribution Center. The built-in Smart charger automatically requlates output between the different charge rates of Bulk (14. 7V) Absorption (13. 8V) and Float (13. 2V) and with Reverse Polarity, Overload and Thermal Protection the PowerMax PM4 Series provides a high output, reliable, safe and clean DC Power. Ideal for use with RV's when replacing any WFCO 8900 Series or any Lower Section Trays, MBA's to provide 12Vdc Power with high amperage outputs for charging battery or run 12Vdc Equipment in the RV, Trailer, 5th Wheel.