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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.
Can you repair it if it breaks?
Most of it. I rebuilt the well system when I bought the house. I installed the backup system from various components. It wasn't a pre-built system. I COULD conserve power by shutting off the UV filter. I could probably run the pump for over a month on a single charge.
If something blows in the charge unit in the battery pack, and I can't find a replacement part, then no. If the batteries fail, I can hack together a replacement if I can get batteries. I have various solar panels and charge controllers around and a 12k panel system on the roof I could tap into and convert if the grid stops. The well system can also run on a propane generator, but as we learned in Fiona, when the entire island (PEI) was dark for 11 days, propane supplies go quick. I had 8 full tanks so I was fine.
But that's the same for anything in a house. If the world goes to shit, something happens and I break my toilet, and can't find a replacement, then I'm shitting in the woods.