Full disclosure, I'm probably not using this panel properly but it's perfect for what I need and does an amazing job. I have a chicken coop that needs extra ventilation on hot sunny days. I installed this panel on the roof of my chicken coop and connected it directly to a 12v battery powered fan installed inside. This adds a little extra air during the hottest part of the day to improve circulation. When there is little sun, the fan blows slowly and really revs up when there is light. I really didn't expect the fan itself to last that long, but it still works.