66.6Wh Solar Powered Fan Kit - 3 Weatherproof Rechargeable Fans with 50W Solar Panel for Chicken Coop, Greenhouse & Shed - Perfect for Ventilation & Cooling in Outdoor Spaces

This review is for a Fanspex 50W Solar Panel 2 Fan Kit with 66.6 Wh Battery Backup.I was very pleased with the package as it was delivered. However, it would have been better with ONE 50w panel, rather than two 25w PV panels.I put each panel out on a cloudless March West Texas day, at 67*F. They were oriented approx. 30* off vertical to get the best irradiance. One 25w panel output 20w which was excellent, the other panel put out 18w, as tested with an Elejoy EY800W PV multitester. This was surprisingly good, since I was expecting something in the mid-teens.The battery says it will power the two fans for approx 5 hrs. when fully charged. I got about 4.25 hrs. You might want to consider a larger battery for longer ventilation. There is no indicator for battery charge status, but it would not be hard to wire a small battery state monitor into the system. The two fans are relatively quiet, and are either ON or OFF. I have not tried to put a speed controller or switch on the fans yet. They move a surprisingly large amount of air for their size.I admit that this is NOT for a chicken coop, but for a workshed that gets pretty warm when the sun shines. I already have one FANSPEX solar dual fan assembly aimed toward the interior roof. This unit was installed near the floor, with a 1/8in hardware cloth cover on it to suck in cooler ground level air in the mornings. It works very well for that. (The hardware cloth is to prevent unwanted crawling visitors.)This is a great package for multiple uses, and if you have a need for a small ventilation system for a small space, I’d recommend this.