Photovoltaic system in new construction: Would you install one? Any experiences?

The things get pretty torn apart... They look nice, but technically...

Technical differences: The yield per area is about 100Wp/sqm, which is lower than with the top panels, because the surface coverage with monocrystalline photovoltaic elements per sqm is lower. The system operates in the low-voltage range – therefore, in case of fire, the house can be extinguished. The system is less sensitive to shading due to the many small individual modules (which is not a problem in our case). The technology from control through inverter to storage is not dependent on the type of photovoltaic panels, so I see no technical difference there. I cannot technically identify a "worse" option as long as the roof area is sufficient. I see the "more expensive" as an investment in the house’s aesthetics – just like a wooden cladding or a special paint job.

Poor due to lack of ventilation = lower efficiency. In general, in-roof solutions are rather exotic and come at premium prices. I would still have very much liked to see a picture of it

(Optics are not an argument for me, all black modules on a properly sized roof look very good imo. I myself have a flat roof, so it doesn't really matter)

You don't have to defend that. You have set priorities for yourself and made your decision accordingly. Everything is completely okay, they do look really good.

As you can see here alone in the forum, the question of investment usually revolves first around amortization and profit. That is rather "difficult" with such a system.

Yes, that just takes longer.

The profit, as so often, lies in the procurement.

Every Tom, Dick, and Harry casually offers photovoltaics on the side. The prices are accordingly abysmal.
For us, it went from 2000€/kWp (heating installer with "complete solution from Vaillant") to 1700€/kWp from the electrician, 1600€/kWp (solar installer; high-quality components but still too expensive) now to 1150€/kWp (regional solar installer with solid components). All prices all-inclusive, net, without storage (of course).

Anyone who wants it to pay off financially must buy cheaply and above all refrain from a storage solution unless it might be worthwhile due to "already there" costs and subsidies. Then a 5% return is quite possible in my opinion.

How many kWp did you have installed? And can you name your regional solar installer? Preferably via PM. Many thanks!

I have also been thinking about covering the carport, which is still in planning, with photovoltaic modules and thus saving the wooden roof and the EPDM membrane. That and self-installation increase profitability.