Operate heat pump autonomously with photovoltaic system.

Thank you for your tip. The possible expansion of the system is of course logical and the resulting outcome understandable. But for me, profitability is the top priority. So it is out of the question. However, I have also already considered wind turbines. Especially in the mentioned months, it operates most efficiently. Another idea was an additional pellet combined heat and power plant. It will definitely be a BYD Pro Hybrid by Fenecon.

I am curious to see how your demand for economic efficiency can be reconciled with the new construction of a house. The heat generator is probably just the end of the chain of inefficiencies, not to mention [KfW40plus]...

I am curious to see how your demand for economic efficiency can be reconciled with the construction of a new house. The heat generator is probably just the tip of the iceberg in terms of inefficiencies, not to mention KfW40plus...

I don't quite understand. Did you just claim that KfW 40 Plus is uneconomical?

I even claim that the construction of a single-family house, occupied by only one family, is inherently uneconomical. Therefore, this statement of yours cannot be true or is hypocritical:

Doch bei mir steht Wirtschaftlichkeit an oberster Stelle.

If you would explain your bill to me, I would gladly show you my bill. Then we can compare.

Although the economic efficiency could certainly be debated longer now: You pay for the savings in electricity/heating energy with money/capital. Because the necessary investments are already visibly high. If you have the money, you have the fictitious loss of interest (currently low). If you have to borrow the money, you pay interest....

However: If I had the money (i.e., in the account, not borrowed), then something like that would also be my focus. Because some people simply enjoy it. Me too. I would waive the interest on the capital share in favor of the resulting thing and the joy in it and make the investment.

A combination with a small 1.5 kW wind turbine would also personally appeal to me. My house, for example, is located in a very wind-exposed spot, especially in autumn/winter/spring, the device would probably run 75% + x.

Complete autonomy is not reasonably achievable in our latitudes at acceptable costs. Unfortunately, the storage required for that can currently really not be afforded. But quotas of 70-80% over the year are already a really great thing from my point of view. I would be beaming with joy if I had something like that.

For me, the scale is much smaller: I hope to reach around 45-50% self-consumption rate in electricity with the photovoltaic system coming in spring + 2kWh storage. If I manage that, I will already be happy.