There seems to be a standard installation developing for domestic EV charge points where it is 6mm2 no matter what. I checked one installation which will have around 9v dropped on a 7Kw charger. Ok, I acknowledge that the full load current won’t be pulled at all times but it can be assumed that there will be long periods when it will. Multiply that by an ever increasing demand across the nation and we can expect to see considerable energy wastage. Perhaps, we should be setting tighter limits than 5%.
In my view, 3 phase should become the norm for most new domestic services.
A 7Kw EV charger with a single phase 400 volt input (connect between any two phases) would have an input current of less than 20 amps. Use of all 3 phases would be better still, with a load of about 10 amps per phase.
For the larger household with multiple EVs, three phase is a virtual requirement.
In my view, 3 phase should become the norm for most new domestic services.
A 7Kw EV charger with a single phase 400 volt input (connect between any two phases) would have an input current of less than 20 amps. Use of all 3 phases would be better still, with a load of about 10 amps per phase.
For the larger household with multiple EVs, three phase is a virtual requirement.
