Works well, and is very well built, the price is about the same as the very cheapest on the market, but it's actually solid. Takes more juice than I would like before it actually starts inverting. I got both the 12.8-30 volt, and the 20-45 volt version. Batteries like I want to go with the charge controllers and panels I already have costs way more than these. Should have sold the power back to buy the batteries. Live and learn.