Dear Victron Fellows,
I have the following use case for two almost identical installations:
On the already existing 3-Phase ESS installation using MultiPlus II Devices, the battery should be charged in case of a grid failure and in time of insufficient PV power.
The installation already has the following devices:
- 3-Phase ESS installation using 3 MultiPlus II 48/3000 operating in parallel to the public grid (230V)
- 3-Phase Fronius AC PV converter connected at the critical loads AC Output of the Multis and controlled by frequency shifting (MG50)
- BYD B-Box 10.0 connected by VE.CAN to the CCGX
- MPPT Solar Charger connected by VE.direct to the CCGX
A single phase 5kVA 230V Diesel inverter is available. It should be used to provide the power for the charger.
Is it possible to charge the battery using an additional MultiPlus II connected to the CCGX?
Can the Multi be connected to the CCGX and does it receive the relevant battery information BYD BMS information (DVCC)?
According to the following question it should be possible. And that is what I would expect and I think is the reason of DVCC.
Asking my dealer to verify the answer he told me that it is not be possible to connect the additional Multi to the existing CCGX, because the additional multi would need its own controller and needs to operate independent from the ESS system.
He suggested to connect the Multi by the relays (LINK). This would not be an preferred option for me because I would expect the charging process to be more optimal if it is controlled by the batteries BMS.
If the additional Multi can not be connected to the CCGX, would it be possible to add another Venus device and connect the CAN Bus to this device for retrieving the BMS information?