text: I bought it to operate a medium size swamp cooler and it did great the two times I tried it. It ran with the pick up truck battery for a few hours until it beeped and stoped. In the morning I turned on the pick up with no problem, the battery still had enough charge. Although I operated the cooler in low speed without using the small pump, I tested it in high speed and pump and it also worked fine. So far so good. I did not liked that the cables to conect to the battery are short and the loop holes are very tiny, so you have to improvise to conect it to the battery. Also it does not come with the lighter conection. Update. After a few uses it stopped working.