We made a solar powered fan bar for our convection cooled solar inverter, just to ensure there was air movement on the hottest days. It was loud and hard to clean the fans. This design aims to improve on both of those factors.
Links: Pending my son ;)
WARNING: As with all electrical projects, there is always danger of shock, fire, burns, and electrocution. If you don't know, learn first or don't do it!