... .98 ConnectionHardwiredOutputVoltage220VAC±1% Frequency50Hz±0.1% ( Battery mode) WaveformSine Wave Power factor0.8 Voltage Distortion2% under linear load Overload Capability105% ~ 130% ... time0 msMaintenance Bypass SwitchYesLED indicatorsStatusLoad level/Battery level, Battery , Utility power, Inverter, Bypass, Overload, FaultAudible alarmBypassAlarm beeps every two minutes Battery dischargeAlarm ...