Photovoltaic system offer for our single-family house

Then I have the wrong expression. According to the Berlin Building Regulations, as far as I know, you are not allowed to have a permanently installed heating system (of any kind) inside, otherwise you need a building permit, no matter how small it is.

We have now ordered our photovoltaic system, we hope for installation by the end of the year but we will see. It will be a 12.8 kWp system 32 modules 400 heat pump Bauer Blackline and a Kostal Plenticore plus 10 inverters. no storage. 1400 € / kWp net including installation, scaffolding, AC/DC connection, registration etc.

1400 € / kWp net including installation, scaffolding, AC/DC connection, registration, etc.

Cool thing, they probably also give a rock concert at the topping-out ceremony of the system at your place. Are we from the forum invited too? :p

Cool thing, they will surely also give a rock concert at your facility's topping-out ceremony. Are we from the forum invited too? :p

Definitely :-D
But only those who bring something are allowed to come :-D

Is 800 kwh/kwp a good value?

Oh, and two more questions, in some offers I always had a position with a SmartMeter, is it absolutely necessary? Should one have one or not?

And secondly, small business taxation or standard taxation?
As a small business owner, you do not get the VAT refunded from the photovoltaic system, but you pay about 7 cents per kWh plus 19% on the fed-in electricity after 5 years and also another 19% on the consumed electricity. As far as I've read, a flat rate of 20 cents per kWh applies, so 1.3 cents per fed-in kWh and 3.8 cents per kWh of self-consumed electricity.
3,396.88 VAT on the photovoltaic system
Which is more worthwhile here?

Is 800 kwh/kwp a good value?

You mean yield? Let me guess: north roof, northern Germany. Then yes.