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.
I have just over an acre of highly productive riverfront land. I have multiple garden, orchards, chickens and can add a pair of goats readily.
The native landscape and wildlife that borders my property and is within walking distance is wildly abundant. Knowing what to forage, the native plants that are edible and medicinal is paramount to long term and situational survival, bridging the gap. Knowing where to fish and hunt and becoming familiar with the critters in my region is also hugely valuable.
You’d be surprised on how much one can grow using permaculture and understanding the seasons and capabilities in your region.