Read Photovoltaic Battery voltage charge

Hi all.
I have a photovoltaic system with an Azzurro ZCS inverter connect to the network and the app for the phone but not compatible with home assistant. I want to let home assistant know the actual charge off the battery but I don’t know how to retrieve the value.

I thought that a good idea is to read directly the voltage of the battery (max 90volts) but I don’t now how to let the esp32 or other similar hardware read the voltage value.

Someone have some ideas ?

Thanks all :grinning: