Photovoltaic system 120 sqm living area - cover the entire roof?

The rest is simple math.

Only that math does not find a meaningful application without thinking. Anyone who does not consider the distribution of yield over the day and the year besides the pure yield calculation can build a system that produces more but makes less usable in the house. With an electricity price that for a newly registered system is a factor 4.x above the feed-in tariff, self-consumption optimization makes sense. And suddenly areas that extend the yield hours instead of maximizing the yield itself become interesting. By now, even 70-80 degree steep south-facing systems on the facade are interesting for the winter yield – almost complete direct consumption in the house.

Meanwhile, even 70-80 degree steep south-facing systems on the facade are becoming interesting for winter yield - almost complete direct consumption in the house.

Or conversely, north roofs are uninteresting due to lack of winter yield. In this respect, I find a planned occupancy of a north roof at 35° DN already questionable.

I think we agree. We will also fully utilize NNO. That way we have yield in the morning. I prefer having a paid-off 23kWp system on the roof after 15 years rather than a 12kWp system after 13 years. Autonomy increases, kWp price decreases, the additional side pays for itself, and the environment is happy. And besides: if, then properly :cool:

I think we agree. We also fully do NNO. That way we have output in the morning. I prefer to have a paid-off 23kWp system on the roof after 15 years than a 12kWp system after 13 years. Autonomy increases, kWp price decreases, the additional side pays for itself, and the environment is happy. And besides: if then properly :cool:

Are you also calculating your ongoing costs, etc., or how do you come to this assumption?

Are you also including your ongoing costs etc., or how do you arrive at this assumption?

This is the calculation from two independent solar technicians. One of them would personally only do the south side. Let someone else calculate and something different will come out. It’s not about the absolute numbers but their ratio. The result remains the same. If I fully cover my roof, the payback period is only slightly longer. PS: I come to a longer period in my calculation. But the bottom line remains the same. PPS: I DO include the ongoing costs, of course.

There are also freaks who occupy the north half of pure south roofs to outsmart the 70% curtailment. Another example of the absurd consequences such ridiculous regulations have.