ᐅ Sizing the Main Electrical Connection (for Photovoltaic Systems, Heat Pumps, and Electric Vehicle Charging Stations)

Dear forum,

We have received an offer from our utility provider for the electrical house connection.
After consulting with our house builder, we are planning for a 37 kW (kilowatt) house connection (assumption: 4-person household, air-to-water heat pump, charging station with max 22 kW, photovoltaic system with about 10 kWp).

The offer for the electrical connection specifies a NAYY 4x 35 mm² (4x 0.014 in²) cable.
The distance between the street and the house connection room is 7 meters (23 feet).

Since the power demand is over 30 kW, a construction cost contribution applies, which, according to my research, is reasonable since this deviates from the standard.

My questions:
1. Is the specified cable size (cross-section) appropriate as mentioned above, and should we consider or inquire about anything else with the utility provider?
2. Many sources mention how the circuit protection should be designed. The utility provider did not provide any information on this (only the cable size as above). Are there any precautions we should take or recommendations on the proper circuit protection for the needs described?

Thank you in advance for your help!

Bauen68 schrieb:

1. Is the connection sizing (see the cross-section above) appropriate as is, or do we need to consider anything else or check with the utility provider?
2. Often there are questions about how the circuit protection should be designed. The utility provider only specifies the cross-section mentioned above and does not give any details. Do we need to consider anything else here, or how should the circuit protection be set up for our aforementioned requirements?

What suggestions and recommendations does your electrician, who will handle the rest, have? Only an electrician can provide the answers to these questions.

nordanney schrieb:

What suggestions and requests does your electrician have, since they will be doing the rest? Only an electrician can provide the answers.

Thank you for the quick response. We do not know the electrician yet (prefabricated house); the house installation is still pending.
I am looking for an initial assessment based on the information provided to see if we are on the right track...

That might be tight. 22kW wallbox, 3kW heat pump, stove 4–13kW, clothes dryer 2kW, now also a kettle, an iron, a hairdryer 6kW, other appliances like TV, fridge, etc., 2kW.

Why not an 11kW wallbox? That would ease the situation.

Bauen68 schrieb:

Do we still need to consider anything else or check with the network provider?

In Berlin, 5 conductors are required. Our calculation was at least 5x35,
70m (230 feet) connection length,
otherwise the same as yours plus a 10kW sauna.
We installed 5x50 mm² (5x0.08 in²) cables underground.

Nida35a schrieb:

In Berlin, 5 cores are required, and for our calculations, at least 5x35mm² (5x0.054in²) was used,

TN-C is common in Rhineland-Palatinate, using four cores.