I’m only half kidding. I’m a bit of a prepper and I have lots of powerbanks and devices that charge from USB but besides idling my truck I really had no other way to charge any of them in case of a long-term power outage which seemed a bit of an oversight on my part.
Not like this solves the issue. 30 watts (under ideal conditions) isn’t much but it’s a start.
Doesn’t it have a limited shelf life? Do you need to maintain it?
Well, I keep it fresh by urinating on it. I collect all my family’s urine in a bathtub so we can have an extra sanitary bath once a week, together, and then I dump the leftover on the pile with this big crane I rigged up outta grocery carts.