I began working on this integration especially to achieve dynamic control of the battery, and did some tests with setting the maximum discharge power between 0 (= no discharge allowed) and 2500 (=the maximum discharge power).
While this works to dynamically use the battery, I discovered that the inverter does not shut down even if the maximum discharge power is set to 0. This means that the “DC to AC” circuitry stays active and continues to draw more than 120W from the battery at any time!
My conclusion: it does not make financial sense to try and dynamically set the battery charge/discharge power with my 5kWh battery due to the high losses.