Is it worth it for me to install a photovoltaic system on the roof?

The entire concept must be considered here. In the short term, a solar system is not financially worthwhile, I am sure of that. But looking into the future, it is indeed a good alternative.

With the funding and with the taxes, [das müssen ein Fachleute beurteilen].

I also hold the view that renewable energies will increasingly come into focus. Solar energy also plays an important role for us. Whether this is financially worthwhile cannot be answered in a general way. The local energy consultant should be consulted here.