On Friday, December 29, 2017 at 9:44:25 AM UTC-5, wrote:
Daniel- Sorry. The link I posted was for a passive, wind powered vent. I put a Nicro Solar Vent on my trailer about eight years ago and it is still merrily spinning away in the 300+ days per year of New Mexico sun.

https://www.amazon.com/s/?ie=UTF8&ke...l_5a1el56vm1_e

I went through a few of these types of solar powered vents on my old trailer. The one common mode of failure for all of them was that the clear resin covering the solar panels turned hazy-yellow, similarly to what the head-light covers of later model cars look like after a few years in the south. Apparently, that resin was not the most UV-resistant. One of these vents came with a clear plastic cover which protected the panel from rain. That worked well until it too turned yellow. However, cleaning it with some soft-scrub compound cleared it up again. Finally, that clear cover showed crazing and stress cracks. UV and plastics just aren't friends, I guess.
A SS-version with a glass cover would be nice.
Uli