System: multiplus 2 5000 48v 50/70
6* pylontech 2000c
Victron Venus GX
sma sunny boy
The system has worked correctly for one year..the batteries can be charged up to 53.2v and are fully balanced.
It seems that the PV inverter assistant uses the volt and current values of the internal multiplus battery Monitor and reduces the power by frequency shifting to zero. If you disconnect the Venus GX device, exactly the same happens as with the utp cable.
In the GX device the pylontech BMS is selected as battery monitor.
Firmware updates and downgrades to the previously working versions in both the GX (2,92) and the multiplus (281) have no effect.
Double checked configured frequences for the sma (51hz, 52hz,53hz) all correct like in the sma configuration it's self.
The pb inverter assistant always goes up to 51,7 or higher when the pylontech are for example at 71% soc and the multi internal battery monitor shows 85 soc or higher. For the internal this might be correct but I think the pylontech BMS Monitor should be used but seems that it is not used for the shifting.
The question for me is: why does the multiplus no longer seem to get knowledge of the correct volt and currents of the pylontech BMS via the Venus GX? The correct values are needed to adapt the frequency correctly.
Victron Connect, the remote console shows all pylontech values correctly.
I am now at a loss for ideas, except that the Venus GX may have a defect in the transmission to the multi. Cables have all been replaced and a and b versions of the Victron BMS cable have been tested.
Any ideas?
Thx, kind regards
André