Restrictions on photovoltaic systems in the development plan

I am currently browsing through development plans for new construction areas that we found interesting (even if some of them may already be partly completed). In doing so, I just came across the following passage:

(Source: Development Plan 900 of the City of Bochum)

At first glance, this seems very restrictive to me (1.50m distance to all roof sides and a maximum of 50%). Especially since I had always heard that if you are going to install photovoltaic panels, you should put as many as possible on the roof, and here suddenly much less would be possible, or is this still within the usual range of what is generally done? I also often see roofs with only about a 50cm gap around them... Are such specifications common? Is the purpose of this purely aesthetic, or are there other reasons for it? I'm just trying to understand where this comes from.

The zoning plan issuer apparently wants the structures on flat roofs to be hardly noticeable from below and, in the case of pitched roofs, for their color appearance not to dominate (i.e., overall the tiled roof area should be at least not smaller than the module area). The houses should not appear as accessories to the solar systems. The zoning plan presumably originated at a time before the Green, Blue & Future hype.

The development plan probably originated in a time before the Green, Blue & Future hype.

Well, the development plan came into effect in 2020 and the city declared a climate emergency in 2019 (whatever that is supposed to mean...), so there was quite a bit of Green hype by then. Although the design guidelines are probably a bit older, apparently nobody was bothered or anything...

What some offices come up with, you couldn't make up ... margin from me is fine, but to prescribe the overall occupancy

If there are already some deviations in the neighborhood, I would ask the building authority how strictly this is viewed.

In case of doubt, just wait until the nationwide photovoltaic obligation comes. In BW it looks like this: In this case, state law would certainly override the development plan