How 'guaranteed' is that rate? I don't keep up with it like I probably should, but seem to often read that some chargers are outdated, and sometimes you have to 'share' if somebody else is charging nearby?
In the EU, there are Ionity and Fastned networks that can guarantee their chargers will be fast enough for this (>=250kW), and together they have a pretty decent coverage along major highways.
There are setups that have their max rated power per dispenser (“pump”), and halve it if two cars are plugged in to the same dispenser at the same time. Good chargers can do 300kW. If that splits to 150kW it’s not too bad - maybe 5 min slower, rather than double. That’s because the max speed the car can take is a curve, and that only flattens the peak.
However, for the 18-min charging the biggest gotcha is the temperature. In Hyundai/Kia it requires the battery to be at 20-25°C. That’s easy in the summer. In the winter the charging speed can drop as low as 80kW.
