Currently the temperature ports on the Multiplus 12/1600/70 are connected to the relay on the BMV-712 and in the event of battery low voltage, the relay closes and the inverter switches to grid input (AC1). Three assistants were created in VE.Configure for the inverter and temperature probe.
I now have a Cerbo-S GX and have connected the aforementioned devices using VE.Direct and VE.Bus.
Can anyone please help me on what I need to do to ‘move’ from the BMV-712 relay and to use the Cerbo?
If you install the ESS assistant you can set the min SOC unless the grid fails. How do you charge the battery? Do you have solar or only use the internal charger? There are options for setting the battery charge so you can keep it full or let it go to 0%. There is also generator scheduling which you can use to turn the grid on based on load or time of day. It has many funtions and very useful.
Thank you. The battery is charged using solar with MPPT; once the BMV detects low voltage, the relay closes and the inverter switches to grid and commences charging. Once clear voltage has been attained, the relay waits another 8 hours before switching power back to battery.
That is interesting. Now you have the GX device you can install the large image and use node red. Here is a flow you can use. I don’t have a shunt but I can send voltage from the 12V multiplus. I can then check the voltage and if its below 12V set the charge current using DVCC to 50 for 8hrs then set it back to 0 if its above 12V. This will allow charging with the internal charger but will not disable the solar chargers. You can replace the multiplus node with the shunt node if you want. I deleted shunts from all my systems about a year ago they were so inaccurate and just use the multiplus SOC and voltage. I have attached the flow code in a text file just copy and import to node red and modify as required.
