Unfortunately unless my quick mental math is utterly out to lunch:
The fastest supercharger station for a Model S is:
From 10% to 80% charge
Supercharger v3 (250 kW DC)
250 kW max rate
140 kW average rate
30 min
810 km/h
So to bring this down to 15 minutes on a pack at least this size would require MORE than a THIRD OF A MEGAWATT of constant current. We’re talking upwards of 333,000 watts of constant charge for 15 minutes.
1400 amps at 240 volts.
You need 1000 megawatts and a grid that can deliver it to charge just 3000 cars all at once at that rate.
The fastest supercharger station for a Model S is:
From 10% to 80% charge
30 min
________
Supercharge your Tesla all the time, means your battery will wear out quicker. Replacement cost -— $23,000? Under warranty is less.
https://www.compare.com/electric-cars/guides/tesla-battery-replacement-cost