Is a photovoltaic system also sensible in the West or East?

: Congratulations on the investment!

The amount of the feed-in tariff depends on the registration date and not on the commissioning. You can save a few months there.

[*]The date of the initial commissioning of the unit is independent of the date of the first feed-in to the grid, the date of the grid connection, and the date of installing a meter.  These dates do not have to be entered in the MaStR.

Yep, commissioning can be backdated in MaStR. But if I remember correctly, you don't need a grid operator for registration.

At the moment, I would keep quiet until the political situation is clarified. You already hear and read about delivery bottlenecks due to Covid-19, who wants to guarantee installation dates. Besides, the price for modules has already increased by 20%, so I would wait for things to calm down.

Bad timing.