for what its worth, mine too is in the garage most of the time. i think the ambient light coming through the windows i have on the doors and overhead lights that come on when someone goes in or out of the garage , that plus times i do drive the car is just enoughThe problem I have is my car spends much of its life in a dark garage. Don’t think I’ll get benefit from the solar aspect…, not to mention I live in Seattle.
That’s said, for $20 it’s worth a shot!