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.
It seems they just wanted something to help power their devices during an outage. You can use fire (like your stove) to boil water during a power outage.
30 watts into a power bank that can output more watts on demand should keep your phone and one laptop usable indefinitely unless you use them 24/7.
Obviously a proper setup in the range of at least a few kilowatts would be more useful, but that's expensive, may require permitting (changes appearance of the house), etc.