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.
That is over 80,000watts per stall.
That is over 80,000watts per stall.
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.
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.
If your neighbor was already at the end of their charge cycle, then they will be drawing relatively little, and you'll get the full current.
"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."