Photovoltaic system: Costs, saving potential? - Experiences?

As for the storage losses: according to the storage, there is a difference of 60kWh between stored and taken out. I have also overlooked that. 15%-20% would then be somewhat more.

The numbers don't seem consistent to me overall. How large is the photovoltaic system? Do you pay any other amounts for the photovoltaic system besides the €43.95? At roughly €10,000 over 20 years, I can't imagine there is a photovoltaic system that allows 2700kWh of storage discharge. The comparatively low feed-in power also argues against this.

Just for comparison: We have a 28.4kWp photovoltaic system with a 10kWh storage and had 2440kWh discharge (and 2870kWh charge) in one year.

As for the storage losses: according to the storage, there is a difference of 60kwh between stored and drawn. I have also disregarded that. 15%-20% would then be a bit more.

These are then not real values or the meter is in the wrong place. That simply cannot be.

The system has 10kwp. Apart from the monthly fee, I pay nothing. The system has produced exactly 11,000kwh in one year. As I said, I take the numbers from the app and thus directly from the [Speicher].

Regarding 1: According to the calculation, it sounds like a great deal, but many details are missing. Which provider, what are the other conditions? Did you have to buy a photovoltaic system at double the price for it, etc.?

Regarding 2: As already mentioned, storage losses, interest, etc. are missing. Then you quickly end up at 15 years, and if the storage fails then, you haven't earned a cent from it...

The photovoltaic system cost €9,000. Of course, I am always talking about net prices, as the VAT was refunded by the tax office. So €9,000 for the photovoltaic system + €6,000 for the storage, with €2,000 in subsidies already deducted for the storage. Ok... so storage losses are missing (if the data in my app are really wrong) and interest, which would push the payback period further back. On the other hand, rising electricity prices over the next 15 years would push the payback period forward again, although of course all of this is just crystal ball gazing.