Operate heat pump autonomously with photovoltaic system.

But I think you still haven't understood that very few people are primarily concerned with making big profits. It's about using as much self-generated electricity as possible and having a certain degree of autonomy in case of emergency.

Which case of cases? Wouldn't it then be more sensible to have a wood heating system and a forest and a field in the garden?

from on the go

Sure... because electricity in the "case of emergency" is what will make them happy... I'll only accept that argument if these people also grow potatoes on their 400 sqm plot in the city at the same time.

Potatoes grow on my compost. When I throw away shriveled ones, one or the other sprouts through.

But I think you still haven't understood that for most people it's not about making big profits. It's about using as much self-generated electricity as possible, and in case of emergency having a certain degree of autonomy.

Yes, I did say that if you see it as a technical gadget and want to SPEND money on it, then you should go ahead. Not everything has to be economical.

Degree of autonomy is a nice euphemism. Either, of course, you are completely autonomous or you are not. Whether you draw more or less electricity from the grid can also be achieved by using energy-efficient devices, watching less TV, LEDs, and so on.

Just the fact that a photovoltaic system usually produces single-phase power and the consumers run on all three phases mostly prevents a larger amount of electricity from actually being used by yourself. The meter balancing over three phases then simulates something that would not be possible in an "emergency." This is purely a calculative/legal autonomy.

Here again is my last paragraph:

But if you consider it a technical gadget, then you buy the thing for 5,000-6,000 EUR, save 2,000 EUR over 10-20 years, and book the remaining 3,500 EUR as a gadget expense and that's it. No one wants to stop anyone from doing that. It's a nice gadget, really.