DSP pure sine wave 1650VA digital UPS has DsPIc microcontroller technology, modern PWM based charging system, 200V - 220V AC output voltage, 12V / 24V / 48V / 96V DC input voltage, 300 ~ 7500 watt rated power, 85% - 95% work efficiency, 50Hz output frequency, high transform efficiency, 20 KHz switching frequency, 100% copper wire transformer, low voltage protection / over voltage protection / over load protection / short circuit protection / input reverse connection protection / over temperature protection.