ᐅ Electric meter Photovoltaic system (solar power system) Air-source heat pump

Hello, I am wondering which value I can read from the second meter "D1."
The first bidirectional meter shows me the electricity I draw from the grid and the electricity I feed back.
At first, I assumed that the meter on the right indicates the electricity I use from the photovoltaic system itself. According to measurement concept 4 (wwn), it rather seems that it shows the electricity I draw from the grid minus the electricity used for the heat pump.

Unfortunately, my reply was deleted and I received a warning:

So, once again: Yes, you understand the setup of the electricity meters and how they work correctly. This way, if necessary, the electricity supply to the heat pump can be disconnected by the utility provider.

Thank you for your reply. I have already read your first message and found it quite helpful 😉
However, I still don’t fully understand the purpose of the second meter. It doesn’t show the current used by the heat pump itself, but only the difference (total electricity - heat pump electricity).

You can simply calculate the power consumption of the heat pump by subtracting the two meters. 😉

Do you have a heat pump tariff? If so, what is the basic fee and the price per kW?
Did they not raise any issues when registering the photovoltaic system?

Offtopic schrieb:

Do you have a heat pump tariff? If yes, what is the basic fee and the price per kWh?
Did they raise any issues when registering the photovoltaic system?

If yes, what is the basic fee and the price per kWh?