... Zero transfer time Protection against all type of power problems Self test while start of the UPS Site ... Frequency46~54Hz or 50Hz ± 0.2Hz (Line mode)50Hz ± 0.2Hz ( Battery mode)WaveformSine WaveDistortion3%4%Overload Capability108%~150% for ... , Utility Power, Inverter, Bypass, Overload, FaultAudible AlarmBypass, On battery mode, Battery low, Overload, FaultAcoustic NoiseAt 1 meter distance45 dBA50 ...