Newbie Home Charging Questions

[Kev946]

Hi All

I apologise for my ignorance as I've not ordered my Taycan yet. I live in France and my current supply to my house is 12KVA so 12KW. We have no spare capacity as we have electric heating. I have contacted our electricity supplier EDF and they have said I cannot go above this unless I go 3 Phase. Then I can have up to 24KW. I realise I could stick to 7KW but this could trip our mains especially during the day when we have many of the electric heaters on. Not such a problem at night.

So Enedis who own the infrastructure are coming to give me a quote on 18th Oct to do a site survey then probably expensive quote . My garage is detached from the house so will need a good length of thick external cable. They are of course keen to quote me for a charge point as well. As the Taycan comes with the PMCC it seems like I should stick to this and don't need an expensive charge point. So do I simply need 3 phase sockets to get up to 22KW from the PMCC. If so I'm thinking I need an external 3 phase socket and one in the garage.

Just like to be sure what I ask then to quote for.

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[Windpower]

My recommendation is to do a ‘load analysis’. This can be done by an electrical engineer or yourself, where you list all of the electrical power sinks in your home. Then you derate the power sinks since not all run at the same time, and when you’re finished with the load analysis, you’ll know how much power you have left over for EV charging.
To be honest, 12,000 watts is not a lot of power to start with. One of my homes has 25,000 watts but one also had 12,000 watts. By careful scheduling charging at night, I was able to charge my old BMW i3 at night.
But you need a power analysis first.

 

[Kev946]

My recommendation is to do a ‘load analysis’. This can be done by an electrical engineer or yourself, where you list all of the electrical power sinks in your home. Then you derate the power sinks since not all run at the same time, and when you’re finished with the load analysis, you’ll know how much power you have left over for EV charging.
To be honest, 12,000 watts is not a lot of power to start with. One of my homes has 25,000 watts but one also had 12,000 watts. By careful scheduling charging at night, I was able to charge my old BMW i3 at night.
But you need a power analysis first.

What I can say is if all the electric heaters are on the power will trip as I've already done this. We were away and came back to a very cold house. So not real spare capacity. We are in rural France

 

[Scandinavian]

Hi All

I apologise for my ignorance as I've not ordered my Taycan yet. I live in France and my current supply to my house is 12KVA so 12KW. We have no spare capacity as we have electric heating. I have contacted our electricity supplier EDF and they have said I cannot go above this unless I go 3 Phase. Then I can have up to 24KW. I realise I could stick to 7KW but this could trip our mains especially during the day when we have many of the electric heaters on. Not such a problem at night.

So Enedis who own the infrastructure are coming to give me a quote on 18th Oct to do a site survey then probably expensive quote . My garage is detached from the house so will need a good length of thick external cable. They are of course keen to quote me for a charge point as well. As the Taycan comes with the PMCC it seems like I should stick to this and don't need an expensive charge point. So do I simply need 3 phase sockets to get up to 22KW from the PMCC. If so I'm thinking I need an external 3 phase socket and one in the garage.

Just like to be sure what I ask then to quote for.

If you have tripped your fuse when away with 12 kVA supply, you clearly need an upgrade. If you only had the heating in the house on while away, no washing machine, no tumble dryer, no lights, no kettle etc. you need their advice on suitable power supply.

Just a simple reflection, if you have electrical radiators or electrical underfloor heating, you may want to look at installing air to air heat pumps. That will save you a lot of running costs, plus the benefit of cooling in the summer.

An installation for a 22 kW charger seems a waste of money. 22kW charger plus >12 kW for heating on a 24 kVA supply does not work out. Unless you decide to upgrade to run 2 supplies of 24 kVA into the house.

Be sure to tell Enedis that the plugs you want to have installed will be used to supply power to an EV for charging. There is a specific circuit breaker tequired for this and they can cost 500 plus Euro each. And if you have to run a very long cable to your garage a 5 core cable for 32 amp will be much more expensive than a 16 amp one.

I think you got a lot of answers already in this thread
https://www.taycanforum.com/forum/threads/newbie-question-on-home-chargers.12834/

 

[Kev946]

If you have tripped your fuse when away with 12 kVA supply, you clearly need an upgrade. If you only had the heating in the house on while away, no washing machine, no tumble dryer, no lights, no kettle etc. you need their advice on suitable power supply.

Just a simple reflection, if you have electrical radiators or electrical underfloor heating, you may want to look at installing air to air heat pumps. That will save you a lot of running costs, plus the benefit of cooling in the summer.

An installation for a 22 kW charger seems a waste of money. 22kW charger plus >12 kW for heating on a 24 kVA supply does not work out. Unless you decide to upgrade to run 2 supplies of 24 kVA into the house.

Be sure to tell Enedis that the plugs you want to have installed will be used to supply power to an EV for charging. There is a specific circuit breaker tequired for this and they can cost 500 plus Euro each. And if you have to run a very long cable to your garage a 5 core cable for 32 amp will be much more expensive than a 16 amp one.

I think you got a lot of answers already in this thread
https://www.taycanforum.com/forum/threads/newbie-question-on-home-chargers.12834/

Let le explain out heating setup. Our main heating is a 8.5KW wood burner. The Electric heater provide background heating. So during the night we have up to 5.3kw of heating on upstairs only. If we have no guests then only 2kw. Downstairs during the day we have 7.2kw of radiators which may be on. The load is higher in the morning to warm the house. Once the wood burner is going well they are not on much. These heaters are inertia heaters and smart so each can be programmed by a smart phone app.

So my load can by up to 12kw but at night is typically 2-5kw and during the day 7kw max. This is heating only we also have the usual cooking, washer, hot water heater; The water heater is also on a night timer. We of double tarif electricity

 

[Kev946]

Maybe I need the home energy manager unit installing

 

[Scandinavian]

Let le explain out heating setup. Our main heating is a 8.5KW wood burner. The Electric heater provide background heating. So during the night we have up to 5.3kw of heating on upstairs only. If we have no guests then only 2kw. Downstairs during the day we have 7.2kw of radiators which may be on. The load is higher in the morning to warm the house. Once the wood burner is going well they are not on much. These heaters are inertia heaters and smart so each can be programmed by a smart phone app.

So my load can by up to 12kw but at night is typically 2-5kw and during the day 7kw max. This is heating only we also have the usual cooking, washer, hot water heater; The water heater is also on a night timer. We of double tarif electricity

Ok understood. My comment about heat pump to save on energy is the fact that the efficiency of a heat pump can be between 3 to 4 times more efficient that an electrical radiator. I.e. you consume 1 kW power but gain 3 to 4 kW heat! And added benefit is cooling during hot summer days.

 

[Kev946]

Ok understood. My comment about heat pump to save on energy is the fact that the efficiency of a heat pump can be between 3 to 4 times more efficient that an electrical radiator. I.e. you consume 1 kW power but gain 3 to 4 kW heat! And added benefit is cooling during hot summer days.

Yes realise. We decided that because our main heating is a wood burner we would go for a low cost electric heating as this was mainly for background heating. But the load can be high. So the energy manager might be the way to go.

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