If you have any details written up on your kit (in partic what solar you used) I'd appreciate a link. I'm looking to do similar

https://traquito.github.io/

https://www.zachtek.com/product-page/wspr-tx-pico-transmitte...

Solar cells are polycrystalline. You can buy them on AliExpress (very brittle - takes practice soldering them)

I didn’t use the Traquito Solar truss. Too hard to solder. I used a foam dinner plate and solar tabbing wire