... 1%Frequency50/60Hz± 0.2Hz(line mode), 50/60Hz± 0.2Hz(battery mode)WaveformPure sine waveDistortionLess than 2% under linear ... inverter and bypass state, overload, system fault.Audible alarmBypass mode, battery mode, battery low, overload, faultNoise1 meter distance55dB60dBCommunicationsDB9 portRS232Intelligent slotWebPower, ... 3593/385555DimensionW*D*H(mm)260*570*717 Single Phase Online UPS 6KVA~20KVA