My config is 3x Multiplus 48/5000, Fronius on L1, microinverters on L2. L3 is free from PV production. Despite setting the charge current limit to 50-80A, the Multiplus units are sending some energy to the grid. It starts around 30A battery charging — approximately 500W is fed into the grid, and it increases with production — at 40A charging, around 1kW goes to the grid. When I disable the Limit charge current setting, everything goes into the battery, but I don’t want to disable it because without it, charging from the grid reaches levels I don’t want — triggering a battery overcharge alarm. The storage system is based on JKBMS. Any suggestions?
Can you be more specific about the micro-inverters, how they are being controlled?
I don’t recall Victron supporting any and they have often been an issue in some installations.
With the JK bms this may be better placed in the modifications section.
Microinverters send data to HA, which then forwards it via MQTT to CerboGX, which sees the production. The microinverters are APSystems — protected via Frequency Shift. I understand that Victron may not officially support this setup, but there’s nothing I can do about it at this point. Interestingly, the excess energy is being fed into the grid on L1 — which is where the Fronius is connected.
P.S. Can I move the topic myself?
Moved.
Your control loop will add latency which will affect how the system coordinates and responds.