Now this is something I'm going to try out at the cabin.
I have a couple surplus 5 watt panels from days gone by, find a couple old computer fans, I think I may have in a tickle trunk somewhere and we'll see.
I'm unsure how it will work for me, thinking to set it in the picture window, a large version, in hopes to generate a bit of heat while we're not there for the week.
I've also had a bit of research done on a pellet stove and once this winter passes and I have some valid solar data I may go that route too. This will depend on battery capacity, solar recovery, and stove requirements.
But if this heater does any good for me, I may not need to go that route.