It depends on how much power you are willing to provide. You could offer anything from a basic parking spot sans electricity all the way up to a 75 Amp J1772, the price ranging from the cost of a sticker (pretty much free) to $2000 to set up depending upon what part of the world you are in.
Our team of Electrical Engineers is developing the most universal and affordable kits possible, and we should be releasing the schematics for this in the coming weeks.
See also: Questions about setting up Charg Stations
And also:
