Do you mean our roof Alex85? No, we are not getting a flat roof and have a 25 degree roof pitch... And the roof orientation cannot be changed due to the development plan... It wouldn't make sense for our house anyway...
So PVGIS provides an annual value of 927 per kWp for our address on the southwest side and 736 for the northeast side...
Even though many sellers think that East-West is the latest trend, it also makes absolutely no sense from a calculation perspective on a flat roof in a single-family house with a system size below 10kWp, unless you want/need to utilize every square centimeter.
okay, so you consciously decided against it? On a flat roof, you usually have the choice. The idea is to compensate for the lower yield from east/west with higher self-consumption. But of course, this always relies on assumptions that it will be worthwhile.