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.
Also don't charge devices directly from solar power because voltage changes drastically due to sun movement and clouds. Better load a power bank and use that to charge the other devices as power banks are much more resilient to changing voltages.
