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I'm suspecting Clark Public Utilities' grid in this location may be near max and some additions may be needed.
I was there when PUD powered up the transformer and put in the watt-hour meter and said it was good to go on their end. If I multiply 480 V X 30KW I get 14,400 KW??? 14 megawatts?? Is this label on other 12 stall supercharger locations?
KIMG0514[1].jpg
 
That's the AIC rating, which is just the maximum current that can be interrupted by the panelboard.

The input power would be something around 900 kW with all stalls in use. If my back of the envelope math is right that's going to be about 750 amps. A high current but not so weird for commercial installations.