In the #UK it's not always sunny enough for one of these to be useful, but I've hooked mine up to a #DIY #battery pack—made of #recycled #liions—and while it's basically useless on a cloudy or rainy day, it actually provides a meaningful amount of power on a sunny day.
This would never work as a commercial product because, if these components were all brand new, it wouldn't make any economic sense.
