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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.
Refers to the efficiency. 25% needs less area to generate the same amount of power. The efficiency has been steadily rising from 18% now to 25%.
Oh I get what you're saying now, wow, I had to read it like 10 times, lol. My bad.