Financing for 15 or 20 years? Photovoltaics via KFW?

Hello everyone,

What I have read so far is that a prerequisite for the funding is the support of the project by an energy consultant/expert and the funding as a KfW Efficiency House. For this, the following KfW Efficiency House levels must be achieved, for example, at least KFW 55 for new builds.
The whole thing apparently consists of two components, such as the "Technology Bonus" (€1,000 - €9,000) and the "Energy Efficiency Bonus" (€3,000 - €9,000), which together make up the "Energy Bonus Bavaria" with €1,000 up to a maximum of €18,000.

There are then gradations again in the individual projects, such as with the "Technology Bonus" for example for heat pump systems with heat storage from €2,000 - €2,500. As an example, a photovoltaic system including storage system with energy management system from €2,000 up to a maximum of €8,500 (presumably depending on size).

The "Energy Efficiency Bonus" depends on the energy efficiency level or the targeted heating demand. For a new build, for example, a 3-liter house with a heating demand ≤ 30 kWh/m²a is specified, which is subsidized with €4,500. For me, however, this value cannot yet really be put into relation with heating systems, as I am not that far with the house planning yet.