Could also be that for historical reasons you could have a house wired for 10 or 13 A and not be aware if it.
‘Course you can manage that by having the chargers limit themselves to 8A default (or even always), at 1800W that’s a very slow trickle but it’s something, and even if it does not fully cover your commute it spaces out carger stops or helps condition the battery on cold mornings.