Tripp lites apsx750 3 function dc to ac inverter with auto line to battery transfer and integrated charging system serves as an extended run ups a standalone power source or an automotive inverter supplies up to 750 watts of continuous 230v ac power to 2 ac outlets from any 12v battery or automotive dc source when ac cable is connected to a live wall socket utility power passes through to connected equipment and the battery set is recharged via 3 stage 20 amp charging system in ups mode