In my ESS system, the maximum inverter power is externaly set to 0 W when a certain SOC is reached to prevent further battery discharge. In the range between 100% and 60% this regulation worked without problems. As now slowly more sun is available again I have lowered the limit to 50%.
Now a strange behavior shows up here:
If the limit value is reached, the inverter switches off as configured. At the same time, the Multiplus starts to charge the battery with 100-200W from the grid, so that the limit value is exceeded again after a short time and the inverter switches on again. Thus, the system oscillates between discharging and charging for hours.
Why does the MP charge from gird at all when ESS is set to Optimized (w/o Battery Life)? The battery voltage never falls below the low voltage threshold and the SOC never reaches below the ESS minimum SOC. Do you have any idea how to prevent this behavior?
