The PowerMax PM3 Series 55 Amp RV Power Converter takes 110Vac power to 12Vdc power to charge a battery and/or power 12V equipment. With our state of the art 3 Stage Smart Charging and adjustable power supply modes, the PowerMax AC to DC power converter/battery charger are engineered with the user and variable environmental conditions in mind. They will fully charge and maintain any battery type while providing very clean DC Power. Ideal for use in RV, Automotive, Boat, Car Audio, or any applications where battery charging and/or 12V power is needed. The PowerMax PM3 Series are available in a wide range of amperage sizes, and with 24V, 48V versions and 12Vdc 220Vac models we can fit every power requirement. PM3 Series Converters can also be wired in Series or Parallel to reach even higher power outputs. Compatible with wfco wf-9855 PM3-55-LK Battery Charger Converter