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.
just over an acre of highly productive riverfront land
Nice, but that is truly vast compared to most of us. I have about 40m² of usable growing space in the back garden and maybe 5m² in the front.
Also don't have a river. Everything that isn't drought resistant is already dead.
As for foraging, sure its fun to do. But if it became required there are now almost 100k people to compete with such a small amount of foragable land. Not going to work.