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.
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Lead-acid battery cells can be replaced pretty easily. The hardest part is sourcing the acid. But, if you can find that, replacing the cells can be done in your garage with basic tools and PPE.
Photovoltaic cells can be replaced easily with a soldering iron and most panels are designed to tolerate a certain percentage of the cells failing. Building new cells might be a challenge, but maintaining the ones you already have is trivial, assuming you can source parts for them.
It may not be perfect or indefinite, but it will certainly get you by for a while, very likely long enough to figure out a longer-term solution.
Don't let "perfect" be the enemy of "good enough".