... Lead-Acid, Maintenance-freeDC Voltage36VDC96VDC240VDCCapacityDepending on the external batteryBack-up Time(Half/Full Load)Charging Voltage41VDC110VDC275VDCCharging ... IndicatorsLCDVFD/LCD Indicator StatusInput/Output Voltage,Frequency,Output Power,Battery,Utility,Inverter,Overload,Fault,BypassCommunication PortRs232/ ... Double Conversion / Online & Sine Wave Uninterruptible Power Supply(UPS)