... external batteriesAC OUTPUTAC OutputOutput systemSingle phrase & earth groundOutput voltage230±20%(inverter output)Output frequency50±5Hz(line normal, according to line) 50Hz ... , I/P& Frequency,Battery voltage,UPS status, load, temperature,O/P Voltage,Frequency, B/P Voltage,Frequency CommunicationsRS232,Intelligient Slot (Web power card, or As400 ...