On: A web server running on an old, broken phone

[solardev]

Not that exact one, but many companies make portable panels now. Here's one from Anker: https://www.anker.com/products/a24261a1?variant=426567535494...

GoalZero, Jackery, etc. also make them, and it's easy to find no name ones on Amazon or AliExpress.

It's best if you can run a long cable from the panel to the phone and keep the phone under shade (or maybe just under the panel). Many phones will overheat if you keep them in the sun all day.