... problem caused by sharp fluctuation Purify fuction solve the Power grid and the power source pollutionDetailed Product Description:Home UPS 1. input voltage ... from 40HZ-70HZ,can accept all kinds of great frequency generator,such as diesel engine .etc.4) protections against output ... -lights, TV sets, air-condition, fans, refrigerators, motors, wind generator, solar system and so on,8) 4 steps AVR, 220v ...