You may be underestimating the power draw of supercharger stations. My model X pulls 200-300Amps of 400V power at a supercharger station with 8-12 stalls.
Just to clarify -- it does not maintain that power. It will quickly ramp up to that on empty-ish batteries (320 amps at 320 volts is max that I know of) and maintain that until the battery is ~50% full. It will then ramp down and charge more slowly. While I can make lots of guesses as to why they charge in this way I don't know for sure on any of them.
This is how Lithium batteries are charged - CC/CV. You first have constant current stage, then as the battery fills up you shift into constant voltage stage where the current is gradually reduced until the battery is full.
However CC/CV change doesn't normally happen at 50%, but further down the charging cycle. It may be that Tesla throttles the current ahead of time due to thermal constraints of the charging system.
10kW array would be at least 600 sqft, so that will be a lot of commercial real estate.
The state/feds should stop subsidizing utility solar and incentivize covered parking lot panels. Prettier than lots and putting the energy where the cars are.
But the stalls work in pairs. They all can't deliver 80kw simultaneously. Ever wondered why sometimes you only get 100A? Because your neighbor, who got their first, gets first dibs on the power, and you get the leftovers.
I've never actually experienced this. I believe the 320 amp / 320 volt charging is for emptier cars... I've plugged in at a 100% full charger and gotten full power charging.
I found this description of a 'typical' supercharger setup:
"The eight bay setup takes a 12kV, 750kVA feed from the utility, steps it down to 480V three phase on site, pushes that into 2000A switchgear which feeds four (one for each pair of bays) SuperCharger units at 480V/200A."