I continue to struggle to understand the voltage and amperage numbers for CCS chargers.
SAE J1772-2017 specifies a max of 1000V and 400A, which is what I
thought dictates voltage and current limits for CCS chargers (or at least CCS1 in North America):
View attachment 619778
I used to think (based on some random EV forum/article comments that I had read) that the latest generation of "350kW" chargers are based on 1000V and 350A.
But evidence shows that Electrify America and Ionity chargers
actually go up to 920V and 500A.
For Ionity chargers (in Europe, CCS2),
this Ionity presentation states that they are capable of up to 920V and 500A:
View attachment 619779
This 500A figure also roughly aligns with the graph from Bjorn’s video showing Model 3 charging speeds which was linked in
the earlier post from @miimura showing charge rates up to ~190kW from an Ionity charger (assuming ~380V X 500A = ~190kW).
View attachment 619782
And for Electrify America CCS1 chargers,
this photo of a "350kW" Electrify America charging station from a
Plugshare page for an EA station in Firebaugh, CA, also shows up to 920V and 500A:
View attachment 619761
So is J1772-2017
not the controlling standard for CCS chargers? If not, what is?
And what is the
actual math that explains the "350kW" moniker applied to this latest generation of CCS chargers?