Not much if they're charging overnight. The average daily milage is 20. Assuming a good but not epic efficiency EV that's 5-6kWh each. Assuming 8pm to 6am then that's 0.5kW, or two TVs. The grid is normally very underused overnight.
How many houses need to be upgraded to run a kettle? (6 X daily average milage?)
Those look like the numbers given by the National Grid. They're optimistic, full of 'plans' - wouldn't trust much of what they say. Using averages soon fails, it depends what you're trying to work out
7300 miles per year is very low - I haven't
ever done as few as that before Covid.
"New diesel cars cover an average of 12,496 miles in each of their first three years." I found.
That's 40 miles per day, weekdays, for which my size of car needs 20kWh per day, because I don't drive round a test track getting the maximum economy.
Say I'm one of the third or so British households with more than one car and like the majority I have only one offstreet space for charging a car. So I want the effin thing charged in 2-3 hours so the household can swap them round and go to bed today. Now you can't expect me to have to charge it multiple times per week like that.
It's got a 90kWh battery. I need to be able to charge it to the max in case ....
Realistically I need 75 kWh in 2 hrs, fairly often.
So I want a 40kW charger or my virility will be impugned.
I have a 60A panel - I'm going to need three of those.
And so will all the other houses in the square whose owners won't want to be undersized.
That's not going to happen. So somebody run along and
tell that silly little Swedish Doom Goblin where to naff orf.