I am confused - aren't these boxes basically fancy three phase outlets? They probably have some safety fuses and some comms equipment, but the 'core' of the system is basically copper wire that connects you to the grid.
> aren't these boxes basically fancy three phase outlets?
That entirely depends LOL
So for AC chargers you are correct - 1 or 3 phases that go through a relay and, where required by code such as in Germany, a DC-sensitive RCBO, plus a small control board negotiating with the vehicle and monitoring voltage/current on one side and, again depending on where required by code, negotiating with the grid operator.
DC chargers are one hell of another beast, these have to contain all of the above plus powerful rectifiers, smoothing capacitors, EMI compliance...
Here in the UK at least they're generally single phase and required to moderate the power delivered to the vehicle based on the current electrical load in the house because most properties have quite low main cut-out fuse ratings. Bonus complications if you have solar or want any kind of access control.
