... DC Fuse, Fan, redundant power supply; temperature sensor, EPO (Emergency Power Off), audible alarmsSoftware ProtectionsDischarging batteries ... output voltage, high output voltage, DC fuse open, %v power supply fail, 13.5 v power supply fail, ... inverter overvoltage, 200% overload on each line, transfer fail, inverter voltage out of range, voltage between neutral and ground high ...