... Ground)Frequency50Hz/60 Hz ± 0.1%Efficiency / transfer timeAC/AC >92% / 0 mswave formSine WaveVoltage T.H.D.<2% ... Bypass breaker; DC Fuse, Fan, redundant power supply; temperature sensor, EPO (Emergency Power Off), audible alarmsSoftware ProtectionsDischarging batteries, Battery ... output voltage, DC fuse open, %v power supply fail, 13.5 v power supply fail, inverter overvoltage, 200% overload on ...