I have a relatively simple Setup:
A few years ago I've installed 4,8kW Peak PV System with a Huawai Inverter. Recently I've added MultiPlus-II 48/3000/35-32 GX with a 175ah Battery. A Victron Energy Meter ET340 measures the residual load and provides the information to the victron.
Purpose / Target:
During the day I would like to store the surplus ov the pv generated energy to use it when there is no PV available or the PV is not capable to feed all consumers.
With VEconfigure I've configured the MultiPlus including ESS as shown below.
The ESS on the Multiplus is oscillating heavily between charging and discharging. It seems to be that the control mechanism of ESS starts the inverter to reach the grid setpoint in the configuration. This leads to a massive surplus which is feeded into the grid (see first screenshot below). This surplus is registered by the multiplus which then controls into the opposite direction and starts charging the battery (see second screenshot). This load causes ESS to take again the other direction and the cycle starts again. This described issue is independent fromthe Huawei inverter which connected to L3. It is caused even when the Huawei inverter is disconnected.
Surplus at L1 due to Multiplus inerter - Feeded into the grid - caused by a ESS
Attempts to relief:
I've tried to limit the maximum inverter power within the ESS configuration (see above) and tried to set the AC input current limit. These configurations seem to be ignored or have no inpact to the behavior described above.
Further Configuration Information: