Strom-Cloud experiences vs. feed-in tariff?

The photovoltaic price is only net, that's why we have considered whether we should go for an 8kWp system to reduce the costs.

I would not reduce the size. That reduces the benefit more than it saves. I would rather ask a few other solar installers. For 10kWp you should be able to get it for around 10,000€ (net). Your price is 50% higher, I think that is quite a lot.

I would rather ask a few other solar installers. With 10kwp you should be able to manage around 10k€ (net).

You don't get that at the moment. Not even with the cheapest Chinese modules. 11 is realistic. Definitely much cheaper than the current offer.

Yes, I have already done that and am waiting for offers. The described offer would be from the electrician who does the house electricity through the construction company.

You can use the hot water storage tank with MyPV heating rod as storage. It is absolutely sensible to think about sector coupling and to consider electrical energy together with thermal energy.

You can use the hot water storage tank with MyPV heating element as storage. It absolutely makes sense to think about sector coupling and to consider electrical energy together with thermal energy.

I just took a look at the device, but the question arises whether it makes sense because it is planned to network the photovoltaic system and heat pump in such a way that hot water and domestic water are sufficiently available throughout the day. To insert an additional heater in between?

Of course that makes sense. In summer, you feed the surplus from the photovoltaic system into the hot water storage. The heat pump doesn't have to start. Saves costs and wear, since the heat pump is not needed for hot water in summer and has to switch less often.