Dear forum members,
According to the scope of work from my construction supervisor, the connection capacity for the house will be 14.5 kW.
Is that sufficient for a modern single-family home with 5 people?
I understand that most appliances are not necessarily running at the same time, but if I imagine that in winter many devices might be used simultaneously, and then a 2 kW hairdryer is added, the limit could be reached.
What would actually happen in that case?
Is it possible to upgrade the connection capacity, or are there restrictions imposed by the utility company?
How does a photovoltaic system affect this? Can it increase the maximum peak power demand of a house, or is it useless if the electrical installation itself is not designed for higher loads?
Thank you and best regards
Tolentino
According to the scope of work from my construction supervisor, the connection capacity for the house will be 14.5 kW.
Is that sufficient for a modern single-family home with 5 people?
I understand that most appliances are not necessarily running at the same time, but if I imagine that in winter many devices might be used simultaneously, and then a 2 kW hairdryer is added, the limit could be reached.
What would actually happen in that case?
Is it possible to upgrade the connection capacity, or are there restrictions imposed by the utility company?
How does a photovoltaic system affect this? Can it increase the maximum peak power demand of a house, or is it useless if the electrical installation itself is not designed for higher loads?
Thank you and best regards
Tolentino
That will most likely be the SLS in the electrical panel. It comes in different sizes.
The utility usually protects the main service connection with a 63A fuse or breaker. That equals 400V * 63A * square root of 2, which is about 35kW.
Then comes the SLS in the electrical panel, which, as mentioned, is available in different sizes. Most likely, a 25A one will be installed for you, which corresponds to 14kW.
I just checked ours. We have a 35A one, which corresponds to about 20kW.
What happens if you exceed the 14kW is simple: the contactor in the SLS will trip.
You should try to talk to the grid operator to see if you can get a higher rating.
The utility usually protects the main service connection with a 63A fuse or breaker. That equals 400V * 63A * square root of 2, which is about 35kW.
Then comes the SLS in the electrical panel, which, as mentioned, is available in different sizes. Most likely, a 25A one will be installed for you, which corresponds to 14kW.
I just checked ours. We have a 35A one, which corresponds to about 20kW.
What happens if you exceed the 14kW is simple: the contactor in the SLS will trip.
You should try to talk to the grid operator to see if you can get a higher rating.
I also think we are talking about rare situations here. You would basically have to be wearing full winter gear and have the cooktop on booster mode, the oven set to 250°C (480°F) with the grill on top and bottom, the hot water tank emptied, and both showers running. Then add the microwave and vacuum cleaner. If the hairdryer (sorry, hot air hair dryer) is also on… you could probably reach around 15 kW.
But I would prefer to have a bit more margin...
And the "larger" SLS fuse is sufficient then? There’s no need to install a "thicker" main supply cable to the house?
But I would prefer to have a bit more margin...
And the "larger" SLS fuse is sufficient then? There’s no need to install a "thicker" main supply cable to the house?
Warning: dangerous half-knowledge.
I seem to remember that at the time, the network operator's conditions specified a maximum of 100kW. Anything above that would have cost more.
The cable brought into your house is already quite thick.
And GU has no influence at all on the network operator’s connection. That is an issue between the network operator and you.
I seem to remember that at the time, the network operator's conditions specified a maximum of 100kW. Anything above that would have cost more.
The cable brought into your house is already quite thick.
And GU has no influence at all on the network operator’s connection. That is an issue between the network operator and you.
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