A system for power conversion without a connection to ground, comprises an inverter dimensioned and arranged to receive a DC input and generate, from the DC input, a first AC line voltage carrying output and a second AC line voltage carrying output. The inverter includes an enclosure formed from an insulating material, and a bulkhead connector interface having a first two terminal port that receives the DC input, and a second two terminal port that couples the first and the second AC line voltage carrying outputs to an AC line. The first two terminal port comprises a first keying feature to prevent a DC plug, adapted for being plugged into the DC port, from being plugged into the AC port. The second two terminal port comprises a second keying feature to prevent an AC plug, adapted for being plugged into the AC port, from being plugged into the DC port.