Obtain photovoltaic system through prefabricated house builder?

Hello everyone,
I am currently considering whether it would be sensible to obtain the photovoltaic system directly through the prefab house builder. It seems a bit expensive to me to buy a 10 kWp system with a 9.6 kWh storage for 26,000 euros including installation. What do you think?
Should I perhaps look separately for cheaper alternatives?
Or do the advantages such as coordination, scaffold use, and warranty that one gets when purchasing through the prefab house builder outweigh this?
Best regards

It seems a bit expensive to me to buy a 10 kWp system with a 9.6 kWh storage for 26,000 euros including installation. What do you think?

The prefab house builder really makes good money off that. Is that enough as an answer? You can't get much more "extra" in terms of warranty anyway (whereas both the prefab house builder and the solar installer provide the same warranties). Find someone who knows about this.

And why only 10kwp? Sounds like it's not even planned for your house.

The prefabricated house builder really makes good money. Is that enough as an answer? You simply can't get that much "more" in warranty (whereas both the prefabricated house builder and the solar installer provide the same warranties).

Find someone who knows what they're doing.

Thanks in advance for your assessment!

The solar booth industry seems even less transparent to me than the prefabricated house builders. Apparently, several solar booths have already gone under and were re-established under a new name at the same address. In such cases, your warranty still expires. This can happen with prefabricated house builders as well, but perhaps it is not as easy there to start anew and get mass orders.

How do you find a reputable partner? Through the Google results in the region, or are there directories that filter out the scammers?

And why only 10 kWp? Sounds like it’s not even planned for your house.

At least demand, consumption behavior, roof orientation, etc. were not taken into account. Probably only the roof area. Although opinions differ when it comes to sizing... 10 kWp is a neutral size.

The solar shed industry seems to me even more opaque than the prefab house builders. In the solar shed sector, some have apparently already kicked the bucket and were re-established under a new name at the same address.

There are also larger companies. And by now, almost every electrician and/or heating installer also offers photovoltaics as an addition. You can also find suitable offers from well-established companies there. You always have the risk of insolvency. And even the largest companies are not always perfect when it comes to damages (example: Sony. I bought a very expensive TV from Sony. After 12 months, the board was broken and had to be replaced. Known problem. After another 12.5 months, the replaced board breaks again. Sony’s proposed solution: take it at your own expense to the nearest TV service center so it can be checked there. BUT: the nearest center is about 600km away, possible repair at your own cost since the warranty has expired. Goodwill from Sony unfortunately not possible – despite the known problem).

How do you find a reputable partner? Via Google hits in the region

Search with well-established companies (see above) and on a specific site whose name may not be mentioned.