... Fuse, Fan, redundant power supply; temperature sensor, EPO (Emergency Power Off), audible alarmsSoftware ProtectionsDischarging batteries, Battery charger working, Inverter working, Emergency Power Off, manual Shutdown ... , 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 ...