LILYGOSolar Charge Development Board Module ESP32-WROVER-B Chip Wireless Module WiFi BLE 18560 Battery Holder TTGO T-SIM7000G SIM CH9102F 16MB

OK, First off it works as advertised.The modem is a little odd though, it only supports a couple of flavours of IOT protacol when in 3G mode, as opposed to being fully 3G compatible, as far as I can tell. The documentation does actually say this but I am willing to bet that most people will see the 3G allong withn the band compatibility in the spec and fail, as I did, to realise that this is not a general purpose 3G compatible module.On GPRS it works fine. This is. or at least will be, an issue in the UK as GSM/GPRS is being phased out and the magour networks do not appear to be adopting the IOT centric alternatives that thid device is capable of handling in the 3G domain.I am no expert here... Look carefyully at the spec, this is just a warning.The other odd thing is the maximum solar input voltage, rated a 6V, with an absolute max of 6.3V, it is quite a bit shy of a the open circuit voltage of a typical small solar panel you might slect to get pMax at a little below the upper charging voltage of an 18650.There will be options out there but this design choice makes selection much more of a pain than it needs to be. OddThe other, frankly maddning, thing is that the board cant be programmed, with the onboard USB at least, whilst the SD card is plugged in, Why, who thought that was a good plan? OTA with the SD in place seems fine.Other than that I am very happy with the unit and would buy one again provided that the speciffic circumstances of its use case were not affected by the shortcomings. In general the board seems solid and capable and having so much on one PCB is good in a dev environment.As a production device... I am not convinced, I think seperate modules would likely be more flexible but it would depend on what you were doing I guess.