To further explain the 400v it is a European thing -- it is 3-phase 208v which ends up being 11 kW charging, a little higher than 10 kW charging we get tin the USA with 2-phase 240v. 3 phase voltage in "IEC" countries ( essentially everywhere but North America) used to range from anywhere between 380 - 415V, with the phase-neutral voltage being 220-240V. For example, England was primarily 240/415, while the rest of Europe was 220/380. There was "harmonization" in the EU a few years ago (2006) to 230/400V, but that is still essentially theoretical and for new installations. there really hasn't been a change in what the utilities produce, just in the labels put onto equipment. The 230/400V is a compromise that allows the different distribution voltages to fall within design tolerances.
The UK is still primarily 240/415, as is Australia (but New Zealand is 230/400).
Most Continental European countries are still 220/380, but Germany has officially changed to 230/400.
in Germany. 415/240V is actually a standard ratio for 50Hz systems.
As North America is almost 100% 60Hz, 600V/480V systems are the most common for your "low voltage" systems (call that high voltage to a lineman in NA and he'll laugh at you...)
I very much doubt we are going to see 415/240 systems in NA, as it would require a lot of replacing of the power grids themselves; it's still a non-starter for a new buildout, as the availability of gear (HVAC, PDUs, etc) for 415/240 is non-existent in NA. You'd have to get a one-off transformer and then import your gear.
The efficiency disadvantages of a 120/208 3phase system are offset by the ease of use. Everyone in NA knows 120V and all the gear accepts it.
