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.
How much did you pay for that? I might be interested in something similar.
30W is plenty for a smartphone or powerbank. I usually charge mine at sub-20W as not to stress the batteries too much. The phone still charges to full (or 95% to be precise) in an hour. I'm in no rush.
Now if it could do 60W - perfect for all mobile devices. Everything from a smartphone to a laptop or a big handheld console.