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.
Full apocalypse is silly to prepare for.
But interruptions are totally a valid thing. Power outage for a week following a storm for example.
In that case I would probably end up cooking over a wood fire if I am still hungry after devouring the entire content of my freezer. Not letting the ice cream go to waste!