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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 /500W Waveform: Modified sine wave Transformer: Square transformer Frequency: 50/60HZ Output Voltage: 220VAC/230VAC Protection: Overload, over temperature protection optional ChargerFunction: With battery charger built in