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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 wondered if a good cost effective setup would be one of those solar power stations, get the smallest battery unit that can take the solar input you plan for. Then use the battery to charge USB power banks for your extra power capacity as they cost less per Wh. But the more expensive battery contains all your inverters that you need. Then just an extension lead and as many USB plugs as you like.