Construction cost breakdown, specific offer: improvement suggestions?

I pay 1,100 € gross per kWp for 13.29 kWp. The scaffolding is used by the BU. The storage should now be below 1,000 € / kW. I would guess about max. 10,000 - 12,000 € gross.

Including assembly and installation, integration into the home network, etc? Which provider did you choose? Recommendations?

Energy consultants are needed anyway. They must not be employed within the company either.

Yes, theoretically. But the companies we contacted would have reimbursed us €100 for the energy consultant if we had removed him from the contract. However, we have now paid €5500....

We also had 3 offers for 5kwP and 5kw storage, and they were between 17k and 19k. However, this is Munich price level and includes scaffolding.

Yes, theoretically. But the companies we inquired with would have reimbursed us 100€ for the EB if we had taken him out of the contract.
But we have now paid 5,500€....

Then let's calculate the comparison between photovoltaic system and energy consultant externally contracted and internally:

Externally:
-100 € credit
+11,000 € photovoltaic system
+5,500 € EB
-2,750 € KfW reimbursement
= 13,650 € cost

Internally:
+18,000 € photovoltaic system
- Reimbursement from KfW for EB? Do you get one? Let's take the same amount in the best case (-2,750 €)
= 15,250 € cost

It is still a savings of at least 1,600 €.

Including assembly and installation, integration into the home network, etc? Which provider did you choose? Any recommendations?

Yes, including installation, integration/registration, home network, modules in full black, performance optimizer. The first inspection after the first year is free. It is a regional provider near Berlin.

Then let's calculate the comparison between photovoltaic system and energy consultant outsourced and in-house:

Outsourced:
-100 € credit
+11,000 € photovoltaic system
+5,500 € EC
-2,750 € kfw reimbursement
= 13,650 € costs

In-house:
+18,000 € photovoltaic system
- reimbursement from kfw for EC? Do you get one? Let's take the same amount in the best case (-2,750 €)
= 15,250 € costs

Still a saving of at least 1,600 €.

You do not get the energy consultant reimbursed.