I successfully installed the KOSTAL inverter binding on my OH3 instance. I checked all the channel values and they are all correct except the battery capacity. I own a BYD HVS Premium with 7.7KWh but the binding shows 90000.01 C as capacity.
Note to myself: it’s not an error - The given value is 90000 C(coulomb). Which means 25Ah (acc. to the data sheet of the HVS7.7 this is the maximum output current). Multiplied by the nominal voltage of 307V one gets 7.7 kWh (E=U * I * t).