Network connection - What power?

Hello,

since our street is currently being renovated and we will be building next semester, the question arises for us as to which network connection we need to have installed, as we have to specify this now.

Unfortunately, we do not yet have final information from our house builder, but experienced builders or specialists will surely know what is correct.

We are planning a single-family house with 2 floors + basement (a total of 270 sqm usable area), continuous underfloor heating, with an air-to-water heat pump and a wallbox for charging electric vehicles (3-phase).

Can the correct connection size be derived from this information? It was assumed 25 kW installed capacity with 3x 63 A.

Thanks for your feedback!

Hello,

were my details too imprecise?

Hi,

the question doesn’t really arise. The standard at our (and probably most other municipal utilities) is a 3*50 amp fuse for the house connection. The upstream infrastructure usually doesn’t allow for more. At least that was the case for us.

That’s roughly around 20 kW. So it’s enough to charge your Tesla with a 400 V 32 A socket and still have 7.2 kW left for the house. Then you have to decide whether to run the heat pump or use the cooking hob in the kitchen, both together could already be tight.

Best regards,

Andreas

Hello,

I don't quite understand your statement now. The standard would be 3x 50 amperes but that is not enough, so it's not a standard after all, right?

What power would then be appropriate or how much should be provided? As mentioned, 3x 63 amperes were offered, so they do exist.

Hi,
maybe I didn’t express myself clearly enough.
Here in Schwabach, 3*50 A is the standard, you won’t get more. Neither for money nor for kind words. Simply because the network infrastructure can’t provide more. (By the way, a widespread problem that is often forgotten in the hype about electric cars). If 3*63 A is the standard with your provider, you probably can’t get more either, or only for an insane surcharge.
But 3*63 A is enough to charge an electric car with a 400 V / 32 A socket and simultaneously operate your heat pump _and_ your cooktop.

More won’t be possible, so you can forget about charging two cars at the same time.

Best regards,

Andreas

For us, the 3*50 A are enough for now because we don’t have a heat pump but an old-fashioned gas heating system. And an electric car is also not planned in the near future. (before that, the Dodge RAM will come to the house as the family whore! :cool
If in 10-15 years they manage to come up with decent batteries for electric cars, I’ll gladly take another look. At the moment, it’s all just play, but that will surely change. The first cars with gasoline engines were also dismissed as nonsense...

Back to topic:
Have you already talked to your provider about whether you can even get a connection with more than 3*63 A?

Best regards,

Andreas