Hi @Herbert01,
I have an Enphase inverter system together with an Encharge 3T battery. I know that the Envoy integration (I use a custom component instead of the official one) does not work correctly with a battery. Basically, the Consumption sensor does not give correct values for the home consumption when the battery is charging or discharging. Charging the battery is included in the Consumption sensor; so when the battery is charging, the Production and Consumption sensors give similar values. On the other hand, consumption from a discharging battery is not included in the Consumption sensor.
This issue is due to limitations of the data provided by the Enphase API that is being used by the integration (even though correct data are available as can be seen in the app). Together with other issues with the Envoy integration, this is being discussed in Enphase Envoy - Current state of things.
Do you also have an Enphase battery by any chance?