The PowerMax PM3 Series Converters are the perfect choice for providing the most efficient charge to your RV Batteries. With STANDARD features such as 3 Stage Charging, Electronic Current Limiting, Automatic Thermal Shutdown, Low Voltage Protection, and Reverse Polarity Protection this makes Powermax Converters the top choice among many RV enthusiast's. The PM3-55LK is an AC to DC converter/charger unit that is simple to install with built in mounting flanges and an AC power cord to plug into a standard 110/120v outlet. The 55A DC output is via junction set screw style terminal block: -positive (red) -negative (black). Simply strip your heavy gauge battery cables and insert into the junction and tighten firmly. This item features built in 3 stage smart charging and single output modes. Output voltage is adjustable from 13.0Vdc to 16.5 Vdc. Current limiting design automatically shuts down power during overload or short-circuit conditions. Plugs into a standard 110/120v outlet Features 3 stage smart charging Automatically shuts down power during overload or short-circuit | PowerMax 55 Amp 3 Stage Converter