It uses the MCP73871 - USB/Solar panel charger and very nice TPS63031 Buck-Boost Converter. Main benefits of the board is small size and possibility to run literally forever from one small single cell LiPo battery.
It's necessary to burn bootloader with ISP before RFM95W module is soldered.
ToDo:
Change ground symbols
Create BOM
#RFM95W, #ATMEGA328P, #TPS63031, #MCP7381, #Arduino