Electricity consumption at home, what is your consumption?

You should get a photovoltaic system. It's really worth it.

About 11,000 kWh per year is what we use. Consumers are 4 people, controlled residential ventilation (runs 24/7), split air conditioning (also 24/7 in summer), home automation + ERR, server cabinet (1x data server [24/7], telephone system, router + modems, etc.), garden pumps, garden lighting and much more.
Is the consumption very high? Yes... but I don't care, I allow myself/us that (we don't smoke or drink for that )

You should get a photovoltaic system. It's really worth it.

[*]What do I do with the remaining 6.5 kWh? Batteries have always been too expensive in purchase for it to be worthwhile.
[*]What does the system cost, 10 to 15k€ (without battery)? If I now calculate with 12k€ and divide by 3k€, I get 4 years until it pays off, if it weren't for degradation, winter, and bad days which I have deliberately left out for now. So I assume 6-8 years.
[*]When should photovoltaic modules be replaced?

The mentioned consumers are not proof of the 11,000 kWh. Or did you forget the heat pump in your list? Otherwise, it’s really not explainable in my opinion.

Basically, I agree with you. But don’t solar collectors get worse year by year in terms of yield?
Therefore, it can’t actually pay off. I don’t know how many kWp I can put on the roof, but if we calculate with 10 kWp, how much comes out after the inverter? Let’s say 8.5 kWh in the first year (is that even correct?).
At 11 MW (11,000 kW) per year. That’s roughly 1.25 kWh, let’s say 2 kWh since the biggest consumption happens in summer but also the biggest photovoltaic generation (we just calculate with maximum generation regardless of how many days it actually would be).

[*]What do I do with the remaining 6.5 kWh? Batteries were always too expensive in terms of purchase so that it wouldn’t be worthwhile.
[*]What does the system cost, 10 to 15k€ (without battery)? If I now calculate with 12k€ and divide by 3k€ I get 4 years until it pays off, if it weren’t for degradation, winter and the bad days that I purposely left out here. So I’d say 6-8 years.
[*]When should photovoltaic modules be replaced?

Those were just some quick thoughts I had. It could also be that I’m completely wrong. My photovoltaic information is also a few years old and I haven’t kept up with it since then.