Is there any/much advantage to using 10mm2 cable for an EV charger instead of 6mm2?

[StuB]

https://professional-electrician.co...impact-of-cable-sizing-on-energy-consumption/

There is a bit of merit in that and it is something I did actually wonder when organising this.

Clearly there are some extra losses using 6mm2 compared to 10mm2 but I think their figures are a little misleading.

They're allowing for 1125 hours use per year which at 7.4kw is 8325kWh per year. If you allow 3 mi/kWh average then that's 25k miles a year which is higher than the average but possible with 2 cars in a house. A lot of households only do 10k a year including us.

Secondly if someone is doing lots of miles in an EV then they'll be on an EV tariff in which case the kWh cost on something like IOG is £0.075.

In our case I think the difference would work out to be less than £1 a year.

 

[plugwash]

Are there likely to be any increases in EV home charger power demands in the future?

IIRC the Americans do single phase charging at 60A, but I just can't see that becoming a thing here, our electrical supplies just aren't big enough to support it.

Some vehicles do 3 phase charging, but you'd need to get the supply to your house upgraded to three phase for that, probably not worthwhile unless you plan to drive long distances regularly in a pickup truck or large van.

 

[blup]

Check what the manufacturer of the charger requires, sometimes they specify minimum 10mm2 iirc

 

[Risteard]

Check what the manufacturer of the charger requires, sometimes they specify minimum 10mm2 iirc

Which manufacturer?

 

[blup]

Which manufacturer?

Think it was hyper volt

 

[StuB]

Think it was hyper volt

We have ordered a Hypervolt and their install guide says to be generous with the incoming cable size and that 10mm or larger is recommended for long runs.

Home 3 Pro Installation Guide

Installation instructions for the Hypervolt Home 3 Pro EV Charger

support.hypervolt.co.uk

Be sure the method you use to supply electricity to the Hypervolt charger is compliant with the BS7671 Wiring Regulations, particular attention should be given to section 722. Remember external RCDs must be as a minimum Type “A”, individual and double pole (Including RCBOs). SPDs should be fitted with consideration given to whether a type 1 or type 2 device would be more suitable.

Select the size of your incoming cable depending on your protective device rating (see next page), installation method and calculated voltage drop. Ensure that the cable size used to supply the Hypervolt is as generous as possible, we recommend 10mm or greater diameter cable especially on longer runs. This will prevent unwanted losses in the cabling and ensure the sensitive energy measurements are given the best quality signal in order to allow for more accurate home energy usage calculations.

All holes must be suitably sealed to prevent water ingress. The warranty is voided if the IP rating of the unit is not maintained or installations are not compliant with BS7671.

 

[Risteard]

We have ordered a Hypervolt and their install guide says to be generous with the incoming cable size and that 10mm or larger is recommended for long runs.

Home 3 Pro Installation Guide

Installation instructions for the Hypervolt Home 3 Pro EV Charger

support.hypervolt.co.uk

The fact they refer to "diameter" of cable instantly brings the advice into question.

 

[StuB]

The fact they refer to "diameter" of cable instantly brings the advice into question.

It doesn't suggest it been well proof read.