https://www.gianlucaghettini.net/lettura-fotovoltaico-da-remoto-con-nodemcu/
here are some examples of what I should create. to publish on cayenne, who helps me to understand something?
We can help you with but what are your leads on these projects? Does your solar Charger/inverter has rs232 output? Can you build a rs232 to TTL bridge?