Charging Mode:Input can only connect to 220V house electricity . Output voltage can only be 12V (24V/48V can’t work) Inverter Mode:Input can only be 12V batterys. Inverter output voltage is 220V.Power Capacity: 300W /500WWaveform: Modified sine waveTransformer: Square transformerFrequency: 50/60HZOutput Voltage: 220VAC/230VACProtection: Overload, over temperature protection optionalChargerFunction: With battery charger built in