Photovoltaic system: Costs, saving potential? - Experiences?

And where are the 9T€ in your calculation? So you have a total investment of roughly 30T€ for 10kWp + 10kWh storage.

You also miscalculated the VAT on self-consumption. Just for the storage discharge alone, around 100€ VAT has to be paid, plus the income tax.

Your calculation should therefore say: Do I have a higher total loss with Cloud than without Cloud? You will not see any profits from it.

How long are the 28 cents for additional consumption secured and what options do you have if the provider increases this price (significantly)?

How do you come up with 30k€? The total investment was 15,000€ (9,000€ photovoltaic system + 6,000€ storage) The 9k€ I left out because they are irrelevant for the two calculations. The photovoltaic system does not change in my comparisons.

I just wanted to know whether the Stromcloud is worthwhile with an existing photovoltaic system including storage or not. So photovoltaic system and storage are the constants and Stromcloud provider and conventional electricity provider are the variables. It is not about profits either, because I do not make profits, at most savings. I was interested in which variant has lower costs.

I will take another careful look at the tax issue this evening. That seems to make quite a difference after all.

The 28 cents can, just like with a normal electricity provider, of course also be adjusted annually. But I can, of course, also cancel at any time like with any other provider and find another provider again.

30K gross including the monthly contributions.

I will carefully recalculate the tax tonight. That seems to make quite a difference after all.

I don't know the cloud contracts in detail, but you should have explained and paid those, shouldn't you?

But I am not allowed to include the monthly fees in the total investment. Those are my annual costs for the electricity provider. Then you would also have to include the costs of your electricity provider for the next 20 years in your calculation.

Just to clarify again:
As a comparison, I looked up the cheapest electricity provider for me on Verivox with the following conditions:
Basic fee: €15.40 monthly
Purchase price: 28 cents per kWh

Personally, I have a cloud contract with my electricity provider that basically only includes a monthly basic fee (€43.95) and allows me to draw 4,000 kWh in winter, which I fed in during summer.

In the end, the simple calculation is:
12*€43.95 = €527.40 cost per year for 4,000 kWh
That makes 13.19 cents per kWh.
But since I have assigned the feed-in tariff for these 4,000 kWh, I effectively lose 4000*€0.09 = €360.

So these 4,000 kWh actually cost me €887.40 per year in total, which corresponds to a price of 22.19 cents/kWh.

In my opinion, no conventional electricity provider can currently compete with that.
Especially since with a conventional electricity provider, the basic fee would still be added on top.

Just name the provider so that the catch can be pointed out.