I can't see any obvious reason why you couldn't hook it up to a solar battery power source, but it would get expensive, as you would need the solar panel, a deep-cycle marine battery, and a whatchacallit that regulates how the panel charges the battery so it doesn't overcharge. Plus the cost of the auto door opener above. Just off the top of my head I would guess you would be in the $400 range, if you had to buy all that at retail.
Dunno about solar powered but I plan on getting one of those battery operated doors as soon as I get my longevity check from work(yes I've last long enough in the school system to get one. I must be nuts!
I'm planning to put a solar powered motion detector light out there too. It's small but only costs $80
You could fix a solar element to that door opener pretty easily. It runs on batteries, so you'd just have to change them out with rechargables and then hook a solar cell to them.
Harbor Freight sells solar pathway lights for $4.99 (on sale) and they come with a solar cell that charges the battery and then the battery runs an LED light. But, you could just use the solar cell to charge the batteries in the auto door.
I think from what I've read that the batteries in the auto door last a really long time, so you may not need to make it solar.
I started out as an assistant teacher, moved into running the after school program at a school, decided I didn't want to be in charge anymore and moved back into the classroom, developed every kids dream---an allergy to my school
was put in charge of In-School-Suspension at an "alternative" middle & high school, now.....
I RULE THE WORLD!!!
Ok, just the school. I am the registrar and data manager. Don't make me mad. I can make you, your child, your paycheck or maybe all 3 disappear without a trace!!!!