... the service life of the battery Intelligence display of output voltage,frequency,battery capacity,fault,over load,load ... Advanced automatic constant charging circuit,prolongs battery life It has perfect battery under-voltage, overload, over-discharge, ... (kg)18212932Universal parameter InputVoltage145V~275VFrequency45Hz~65HzOutputVoltage220V±2%(Battery mode) Frequency50Hz±0.5%Output wave fromSine ...