Hello
I became the lucky owner of a PV plant, but I don't know how to count it

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The installation works for 2 days.
According to the counter, item 2.8.0 - I gave away 3.9 kWH
According to the inverter, I produced 9.4 kWh
Whereas the meter, consumption item 1.8.0: for 2 days 26kWH - that is 13 per day.
Why is the item 2.8.0 shown on the meter, if everything that the installation produced was for the current consumption, and it was definitely downloaded from PGE?
So why is 3.9kWh given to PGE?
Before installing PV, I also used ~ 13kWh per day