Photovoltaic system: Advantages and disadvantages, experiences, worthwhile?

Right, mixed it up, was due to the number - insanely high power consumption...
With a battery, you should definitely be able to reach close to 100% in summer, otherwise it's totally pointless.

Heat pump, circulation line, 2 households, small child, tumble dryer, 3 refrigerators, air conditioning, rain shower... highest self-sufficiency level was 88%. If I turn off air conditioning, circulation line, and ventilation, certainly >90%. But do I want that?

Is it possible to finance a photovoltaic system "cost-neutral"? Unfortunately, we have no money left...

KfW with 0.5% eff ... for me 79€/month - over 15 years

We also get an extra meter for the heat pump, but to be honest, I haven't found a "cheap" tariff for it yet. Or is it more about buying cheap night electricity?

Yes, there are providers with "heat electricity" - I still have this, but it will be dropped because otherwise no coupling of storage/photovoltaics with the heat pump. I want to trigger the heat pump via HomeManager and then fully use the storage. Interaction with photovoltaics + storage + heat pump + weather forecasts

Heat electricity currently about 0.20€/kWh plus base fee ...

Yes, there are providers with "Wärmestrom" - I still have this, but it will be discontinued because otherwise there is no coupling of storage/photovoltaics with heat pump. I want to trigger the heat pump via HomeManager and then fully utilize the storage. Interaction with photovoltaics + storage + heat pump + weather forecasts

Wärmestrom currently at around €0.20/kWh plus basic fee ...

It works through a cascade connection of the meters, I just learned?

Yes. Just google for other forums on photovoltaics. Links are not allowed here. With moderate consumption, one meter is enough.

Heat pump, circulation line, 2 households, small child, clothes dryer, 3 refrigerators, air conditioning, rain shower... highest self-sufficiency rate was 88%. If I turn off air conditioning, circulation line and ventilation, certainly >90%. But do I want that?

Same here, except no 3 refrigerators. But I was more concerned that if you already have a storage system, it should be designed so that (losses aside) you can at least reach almost 100% in the summer half-year. Why is it not enough for you? Are there too high peaks or does the storage not last through the night? I find storage systems interesting, but when I hear something like this, it really takes the fun away.

For moderate consumption, a single meter is sufficient.

2000 kWh household
3000 kWh heat pump
Annual values