The only sensible option would be to use a high voltage.Hope it's true!
I find it hard to believe you could charge a car battery in 5 minutes. Dumping 180KW into anything for five minutes seems like it would kablooey and *WHUMPH* or BOOM! followed by "OMG!! TEH CAR SPLODED!"
I think you left out a comma, but you probably wouldn't want to run the station off a pole-pig, if that's what you mean.I think the station would need a 10kV feed running it from 400V three phase would be impractical.
I live in a very rural area, pole mounted transformers are EXTREMELY rare, you only ever see a handfull of them as you drive round.Yes, I missed out the comma.
The UK electrical distribution system is slightly different than yours. A large substation transformer is normally used to power a housing estate, industrial block a small village. Pole mounted transformers are normally only used to supply remote rural areas.
Wouldn't the gas station just install a few of the same batteries as in the cars?Could work at 600V... but it's 300A (big freaking huge cables and buss bars) and would be pulling as much power as a city block. I imagine the "gas station" would have to have a temporary power source to handle these five-minute peaks.
I have an idea for how to deal with that - replace the big underground gas tanks with big underground flywheels. Flywheels slowly spin up to peak speed to keep the average draw off the grid reasonably low, but can move a massive amount of power quickly when you charge your car.