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.
There is no recovery after actual apocalypse unless you are fully capable of maintaining an essentially fully off-grid village full of the skills, tools, and stock needed in pre-1850-ish America. If actual supply chain collapse occurs there is nothing left to restart modern civilization once all the people with knowledge and skill starve and the ability to replace parts vanishes thanks to global manufacturing and resource extraction being so compartmentalized. Digital media will become difficult if not impossible to access, and picking up books to learn how to live after it’s already collapsed will also be difficult as libraries are few and far between, and even those will have a limited how-to section for a manual skill survival society.
Being able to sustain oneself safely after an acute natural disaster is the goal.