The OutBack Power Systems’ Ground Fault Detector Interrupter (GFDI) is a safety device for a photovoltaic (PV) array. In the event that the array becomes shorted to ground, it disconnects the PV system from the batteries. The GFDI consists of a single 0.5 amp breaker, mechanically connected to a combination of 1, 2, or 4 standard OutBack 80 amp breakers