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What exactly does this V3.0 SC mean? Faster charging?

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Unless some thermal protections are removed, we can expect charging speed to only slightly increase between about 5% and 20% SOC, using a typical supercharging profile as reference.

I think the big win will be the ability to charge at higher power levels when sharing stalls with another car.
 
The more realistic benefit I see with V3 supercharging is that we can most likely now achieve max V2 speeds more consistently. I've supercharged a number of times and have only received max 120kw once out of the maybe five times I've been at the charger without another car occupying the shared stall and below 30% SOC.