1,Pure sine wave output, available for sensitive load 2,4-step progressive charging, 7 battery type ... other equipments which use single phase powerFeatures:Pure sine wave output, available for sensitive load 4-step progressive charging, 7 battery type ... .5V for 12V,21V for 24V,42V for 48VLow Battery Transfer10V for 12V,20V for 24V,40V for 48VHigh Voltage Alarm16V for 12V,32V for 24V,64V for 48VMax ...