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There are close to zero 350kW or higher charge stations out “in the wild”. Actually, there are few public charge stations over 50kW “in the wild”, except Tesla.
Yep, it's a small number at the moment. When you posted, it was literally zero in the USA. A month later, there were two dozen chargers spread over 4 locations.
In Europe, 150kW+ chargers started to go-live last November. There are various "random" locations live, plus one joined-up long-distance corridor live (Berlin to Munich).
There is lots of PR promoting 350-400kW, but that is the capability of the charger, not what the vehicle can accept. Virtually ALL electric vehicles that use CCS, as well as CHAdeMO and GB/T, are limited to a maximum of about 45-75kW MAXIMUM, regardless of the capability of the charger
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CCS-Combo2 - currently capable of 400kW (400A * 1000V), however the only car that can use more than about 75kW (Hyundai Ioniq) is the future Porsche MissionE at about 250kW maximum (400A * 625V estimated).
The Jaguar i-Pace can accept at least 100kW.
The i-Pace has a nominal 388V battery pack, with 450V peak voltage - which suggests a peak charge rate of 170kW - 197kW might be possible from the 350kW chargers.
The good news is that all the world’s public DC fast charging will ultimately be at 400kW (400 amps * 1000 volts). It’s important to note that there is only ONE car that has a battery over 500 volts that has been publicly announced; Porsche MissionE at 800 volt maximum.
I'm really interested as to why you feel those particular numbers will form the final destination for DC fast-charging.
Is it simply that CCS-Combo2 has that in its road-map, and there is no compelling reason to exceed these numbers?