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Efficiency, which is the ratio of output wattage and input wattage, the closer to 1 of this number, the better of its efficiency , for on-line UPS as example , the average efficiency is between 70% to 80%, input is 1000W, output is between 700W to 800W, UPS itself consumes the power of 200W to 300W; while the stand by UPS and line interactive UPS which efficiency is about 80% to 95%, higher than the on-line UPS, if you want to know the detailed information, please refer to the stand by UPS, line interactive UPS, On Line UPS and other proper nouns introduction.