I’m sure you’ve seen some of these inexpensive solar powered outdoor lights.
I’m wondering if they could be re-purposed as outddor LoRa Senders (ie, replace light with esp32/LoRa) ? What considerations would need to be made? I assume the battery discharge voltage and current would need to be within some specification to the board. Any thoughts as to what those specs are and any precautions?
I think you can use those solar panels without any problem.
Measure the output voltage and see if it can go through a TP4056 lithium battery charger module.
In the datasheet, it says the maximum input voltage is 8V. I think you are good to go with those solar panels (seem similar to the ones we have that output maximum 6V (take a look at module 11, Unit 4).