Discrepancy in Solar Energy Production Between SMA Webconnect Inverter & Tauron Meter (5 kWp)

Hello,

I have a solar installation with the following parameters:

Installation power: 5,000 kWp
Annual production: approx. 4 450 kWh (890 kWh / kWp)

Communication: SMA Webconnect
Inverter: [Sunny Tripower 5000TL-20] Sunny Tripower 5000TL-20

Energy is discharged to the network through a 2-way Tauron counter.

The problem is that in relation to what the meter integrated with the inverter shows me, the Tauron meter gives me significantly understated amounts of energy discharged into the network.

Examples are:

production in 2017:
according to SMA - 4 683.24 kWh
according to Tauron - 3,715.00 kWh (amount of energy fed into the network)

In the period from 1 July to 31 December 2017:
according to SMA - 2 108.16 kWh
according to Tauron - 1,648.00 kWh (amount of energy fed into the network)

Is it normal for the Tauron meter to lower too much, or is the inverter overstating the amount of energy produced ??
What is the big difference?

I heard from a friend that it is assumed that 5KW panels are used to draw about 5MWh of energy annually - according to this assumption, it would appear that my inverter shows the correct amount (4.6MWh).

What's up? Should I Attack Tauron? Has anyone already done a similar case with Tauron or another energy distributor?

greetings

The inverter shows the value of the current produced and the meter delivered to the network. The difference is because you use electricity at home.

You forgot that the house also consumes electricity, and the energy meter counts only the energy sent and taken, what you consume is not visible in the settlement.

You know what, I think you're right
I forgot one thing that these cells are not connected to the meter with the meter back to power the house only everything is on one cable.
This can be checked simply by switching on an iron, kettle and vacuum cleaner on a sunny day, and then the energy meter for Tauron should stand. about turning off the receivers should start buying energy sold.

I made a logical mistake .... thank you for the lead