I have a 75A OpenEVSE for sale, if your interested. I've been using it to charge my twin charger Model S for over a year now: https://code.google.com/p/open-evse/wiki/75AOpenEVSE PM me if interested.
I hadn't thought of an OpenEVSE. I'll have to think about it as it'll involve a few others. This would be at my work and in a public area. Right now I charge at a public (pay for parking) EVSE that charges at 18mph. I love the twin chargers. Just got my 100amp HPWC installed at home, AWESOME!!! Cant go back now. I wish Tesla would sell SuperChargers
also clipper creek CS100 CS-100, 70/80A, 240V charging, 25 cord | Clipper Creek Vehicle Charging Station or HCS-60 HCS-60, 48A, 240V Charging, 25? Rubber Over-molded Cord | ClipperCreek | Clipper Creek Vehicle Charging Station