Afternoon,
The Revov R100 units have full communications via CAN with SunSynk range. It does require technical assistance which is readily available through the technical department which you can contact on 010 035 6061.
In regards to your second question– The Revov R100 units will communicate with each other as well as the inverter (of approved list) as well. Unfortunately they do not communicate with batteries of different brands. The solution to that would be to configure the inverter on a voltage setting and ensuring the 4 batteries are attached through a bus bar system of industry standard with accompanying fuses.
The Revov R100 units are fully compatible with the latest firmware of both SunSynk and Victron brands.
If you have any further questions, please provide your contact details to enable someone from Revov's technical department to assist you further, Otherwise kindly contact them on 010 035 6061.