MPPT Solar Charger GUI-O Control

[gammda]

Here is one example of adding an Eyra electronics MPPT-100 MPPT solar charger remote control device.
[https://www.eyra-elektronika.si/solarni-regulator.htm](link url)

It's a great product, now I can control it remotely via WiFi and GUI-O.
I use the RS232 port to communicate with the device.