Worked well for the first three months. Then it fails. It seems to work, but when even a small load (less than 100W) is connected, it stops working. However, no indication that the exit is dead. I'm so sad. Lost $170. The device was running for about 1000 hours before the first catastrophic problem. I also don't like that it takes a few seconds for the inverter to get 118V. I use it in a solar system. I do not recommend buying it.