How do photovoltaic system providers search for a new construction?

1. I am of the opinion that such a development plan would not withstand a legal challenge. Pragmatically speaking, however, that doesn't help you, as the battle is too long and the outcome uncertain anyway. 2. I would therefore simply (unless that is also prohibited) angle the photovoltaic system by a good 30°, then you have an acceptable tilt (which is often done on flat roofs, 12° is not that far off).

...but how do I find reasonable, reliable, and supply-capable photovoltaic system providers? Many thanks.

THAT is a very good question, but unfortunately you will probably share the fate of many others currently looking for photovoltaic systems (unless you suddenly get TOP recommendations from relatives or acquaintances). Call or write to all providers found somewhere, wait weeks or even months for feedback. Weed out outrageous defensive offers (95% at the moment?). Choose a provider. Wait 1 year or longer for components and installation. Then finally be happy someday and enjoy every day how efficiently the photovoltaic system runs. P.S. Many heat pumps also run without photovoltaics; with photovoltaics "it's just more fun." If you can even get a heat pump right now :oops:

2. So if I were to simply (unless that is also prohibited) prop up the photovoltaic panels at a good 30°, then you have an acceptable tilt (which is often done on flat roofs, 12° is not that far from that)

Propping up is done on south to southwest/southeast sides. On the north side, rather keep it flat if the roof orientation should remain like that. (I mean to allow more irradiation from east and west). A quick Google search also brings up statistics quite quickly.

Is storage mandatory for you? Otherwise, I would reconsider that in your position. We will have one, but economically it is an expensive affair ;-)

Do you have any regulations requiring the system to be installed with the construction? Or is it more your hobby?

A north-facing roof would work too, but then you would need more modules for comparable output. South would be better, of course.

The costs for the system on that scale are roughly 800-1000 euros per kWp plus 5-6000 euros for the inverter/electrician/scaffolder/miscellaneous plus the battery, if desired. You should be able to get serious offers in that range currently. All prices are net.

Are you building the semi-detached house with a developer? Then ask the roofer if he would place the mounts and modules on the roof for you. Just placing. You can connect them to each other up to the roof edge yourself. Then you have the most annoying part done, and a scaffold would already be available.

You can have an empty conduit from the roof to the electrical cabinet commissioned by the electrician and at the same time ask if he would handle the inverter and connection of the system. Otherwise, ask a solar technician if he would take care of this part in the electrical cabinet. He wouldn't be involved with planning and placing modules on the roof, which increases the chance of a sooner appointment that he could fit in between.

There are also forums on the subject of photovoltaics (which are not allowed to be named here) where you can get help with planning and module selection.

Is storage mandatory for you? Otherwise, I would reconsider that in your place. We will have one, but economically it’s an expensive pleasure ;-)

Exactly: First fill the roof with as many modules as possible – and if there is money left, get a small battery (typically 5 kWh) to bridge the night and some clouds. More rarely pays off, and a large module capacity allows longer annual use of the heat pump through solar power. On the other hand, the battery does not make it run!

Staking is done on the south to southwest/southeast sides. On the north side, it is better to keep it rather flat if the roof orientation should remain that way. (I mean to allow more radiation from the east and west). A quick Google search also brings up statistics on this.

I don’t quite understand that right now. But PVGIS would provide clarity here. It currently doesn’t work for me on my mobile phone...