Why you limit yourself to 400V? Today 250kW chargers are available: https://en.wikipedia.org/wiki/Tesla_Supercharger https://en.wikipedia.org/wiki/Tesla_Superch

Why you limit yourself to 400V? Today 250kW chargers are available: https://en.wikipedia.org/wiki/Tesla_Supercharger https://en.wikipedia.org/wiki/Tesla_Supercharger so we need 2.7 times of that. > The voltage range was increased to 1000 V and it supports up to 615 A (charging cable) / 1000 A (charging pole) for power delivery.[14][15] However, they are currently software limited to 250 kW.[12][16] v4 charger already features thermally conductive liquid to dissipate heat. Maybe one could get rid of cables and car could park near charger and some serious metal rods could automatically connect somewhere under the car. Anyways, that 1000Vx615A already supports 615kW so very close as far as we consider cables/connectors.