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V3 charging is capable of up to 250kW. At very low SOC and under ideal thermal conditions Model 3/Y will charge at 700A very briefly before reducing as the SOC increases. 600A is more typical at low SOC.
V4 is supposedly capable of 350kW and might be capable of over 900A.
The current Model 3/Y cars will not likely directly benefit from V4 Superchargers. They don’t typically utilize the full capability of the V3 Superchargers. V4 will benefit cars that have larger batteries.
We encountered a Tesla semi charging at Kettleman City a couple years ago. It was parked alongside a whole row of Supercharger stalls. The driver was politely fussy about me not coming around the front of his truck far enough to see the secret stuff, but the very brief glimpse I got looked like there were several ordinary Superchargers plugged into some sort of harness, that was in turn plugged into the truck. So, yeah, it was pulling more than us mere mortals.