We've been trying to increase EV adoption and transportation sustainability @ Caltech in Pasadena, CA. It took a couple months to get the design in place and things approved, but we have finally started construction. The system is designed to satisfy the needs of a substantial number of EVs, not just a couple of stations here and there.
The goal is to provide free 50x L2 80A stations in a single parking structure for the campus and visitors. Parking Spots are not time enforced, so there is no rush to come back to move your car when it is done.
We're doing 2x 150kva transformers(32inx27inx44in), these made the most sense for the wiring size, distance, expected demand, and parking geometry.
They are quite heavy...800lbs, so floor mounting was the easiest method...We also needed 3ft clearance in front of the unit, so the easiest thing was to point them at each other.
Stuck my hand in there...
We also started mounting the actual stations...it's going to be 30x on one side and 20x on the other...should not have a problem finding an open station.
We will have to relocate some of the existing 480v breakers to make space for larger breakers feeding new transformers...We had to take readings to prove we have excess capacity...lots of it.
Anyway, the stations will go live in January, 2016. I'll more progress soon...