Abstract: A converter in one embodiment including six solid-state switches arranged as a three-phase bridge circuit operable in a first mode for inverting the DC voltage from a battery into a plural phase AC output voltage, and operable in a second mode as a single-phase bridge rectifier for controllably rectifying single-phase AC line voltage into a DC voltage. An AC relay in its de-energized state has switch contacts for connecting the three-phase AC output voltage to three output terminals, and the battery voltage across the bridge circuit for inversion. A single-phase AC line voltage is connected to the converter for energizing the relay, for disconnecting the bridge from the output terminals, for connecting the AC line voltage to the bridge for rectification thereof, and for reversing the connections of the battery to the bridge. A microprocessor is preprogrammed for controlling the operation of the bridge circuit for either the inversion or rectification modes of operation.