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This UPS failed almost exactly two months after I purchased it. It displays an "F07" code which is a temperature failure. This seems to be a common problem for this unit. If I let it cool off for a few hours it starts working again. I removed it from use and tested it with an indicated load of 340 watts. It ran for a few hours, then shut down again. It was too late to return it so I did an experiment using an external fan to help cool it down. It ran successfully for 24 hours with a 470 W load. I am going to keep using it with the external fan. The bottom line: This is obviously a design flaw. The internal fan is not quite adequate to prevent the unit from sensing an over temperature condition. If you experience this problem, add an external fan and it should work just fine.