It's just a regular folding solar panel (with mini USB output) from Amazon. Today has been quite sunny so the USB battery bank has gone from 10 to 14%. So it certainly seems to be working now.

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Very cool!

Finding the down side now: the solar panel (with less/no sun) is making the USB battery bank go funky which is making the Heltec unit reset. So I'll need to either change the panel or the battery bank. Hmmmm. 🤨

What's the charging setup? Panel to what to battery?