Photovoltaic system: How much kWp is sufficient for a house?

interesting report. My photovoltaic system is oriented east/west. The yield is somewhat less than with a perfect south orientation. But the electricity from the roof comes a bit earlier. Since I also have a Kostal inverter, I am considering retrofitting a BYD battery. There is even a subsidy from the state, but then I would only be allowed to feed in a maximum of 50%, and that kills the return :-(

That's why I had it installed so uneconomically without subsidies after 9 months. If you mean the 10,000 houses program in BY, then there is the subsidy with a new overall system in configuration 1 kWp photovoltaic = 1 kW storage. Joking aside - The storage was simply not planned at the beginning.

Here's a chart from yesterday without charging the electric car. Tomorrow then with the electric car.

The blue peak between 6:45 PM and 8 PM is the dishwasher

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Here’s a chart from yesterday without charging the e-car. [ATTACH alt="14B457B5-C000-4DA1-BF48-FBBB14CBFC14.png"]46710[/ATTACH]

Nice example: you can see that around 9 a.m. the battery is full. And during midday, you would reach the feed-in limitation (at 50% limitation due to subsidy).
Is it the same for you, that some electricity is still drawn from the grid, even though the demand can be fully covered by the battery? I had read about that.

Yes, it really is like that. But until noon today it was 62wh.

In the screenshot, you can see the electric car charging (green) at 14A via Schuko, so with 3.2KWh. Faster/more is not needed. It will be full after 5 hours.

And what I noticed is, KOSTAL is really bad when it comes to app and Solar Portal.

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You should definitely change your charging management!

The battery should charge around midday; if you exceed the capping limit, you will stay below it. Otherwise, it is wasted electricity. (As long as you have set the limit to "soft" and have not limited the inverter accordingly. The SHM from SMA can definitely do this as far as I know. And always make sure that the car is not charged from the battery. Otherwise, you first charge the home battery and then the car battery. That is wasted energy twice.

Yes, it really is like that. But until noon today, it was 62wh.

Can you please check how much that amounts to in a whole day?

And what I noticed is, KOSTAL is really bad when it comes to the app and the Solar Portal.

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Yes, for me the display in the portal/app is often delayed by 12 hours. However, a completely new portal is supposed to come in June/July. I am curious and hope for improvement.