Photovoltaic system at the multi-family house. 100% approval from the homeowners' association?

In such a case, one probably has to offer something to the owner who is against it.

You don't have to offer them anything. Then there is a close decision and they simply don't have to pay for it. However, they also do not benefit from the advantages. And the "offer" not to be charged is very strong. May the Force be with you.

In addition to deciding to invest themselves, the community of owners can also lease the roof area to someone who operates a photovoltaic system on it. Advantage: predictable returns even for the greatest skeptic. Disadvantage: lower profitability. Attention: there are many scam offers.

Such a topic must therefore be discussed openly and honestly with everyone. A binding cost estimate with an amortization plan is probably also important here.

Binding cost estimate with amortization plan is probably also important here.

First, think about how the electricity is to be used/distributed at all. Only then can reasonable plans be made. It is much cheaper to simply feed everything in than, for example, to install self-consumption meters and create corresponding billing. But then the system may only pay off after 12.5 instead of 7 years.