On Saturday, March 11, 2017 at 11:45:07 AM UTC-8, David R. Birch wrote:
I've been think about installing this in my garage which has no
electricity running to it. I've googled "Solar Powered Garage Door
Opener" and only found general talk

Well, this is a famous solar powered closer:

https://www.youtube.com/watch?v=EzyoD19q1YQ

I guess it could be scaled up.