... ,protections of over voltage,over voltage,overcurrent,overcharge of batterise,feed and so on.2.SpecificationInput voltage/Output voltage220V±20%/220V ... -10oC~+40oCCharger time8 hours/timeInverter supply time(Rating power 80%)3-4mins(rating power 50%)8-10minsInverter Charge time<10msOutput waveformSquare waveYawp ...