Hi Strider,
Welcome to the world of Roadster ownership!
Here are the charging station choices as I see them:
120V Outlet - 3 miles of range pre hour of charging is pretty slow, but could be helpful for any EV driver. This is an OK choice if 120V is already available at the charging spot and cost is to be minimized.
Tesla HPWC (formerly known as HPC): The best possible charger for the Roadster, up to 60 miles of range per hour of charging, but useless to everyone else. I would consider this only if your workplace would make a good charging location for other Roadsters passing through town, or perhaps if you get a free HPWC through the Roadster referral program.
NEMA 14-50 outlet: Useful for charging with a mobile connector, up to 36 miles of range per hour, some other legacy EVs can also use this type of outlet, but not useful to Leaf, Volt owners. This is an OK choice if 240V/50A is already available at the charging spot and cost is to be minimized.
J1772 Charging Station: Handy for what will soon be the majority of EVs on the road, not so handy for the Roadster today. I expect Tesla will provide us with a solution, most likely an expensive adapter, but that's just conjecture at this point. If Tesla doesn't come through, a third party solution may solve the problem. There's more detail on the
J1772 thread.
One possible option would be a charging station that has both Level 2 J1772 and a Level 1 120V outlet. This would be handy for you to pick up a little charge with the MC120, and more useful if/when there's a J1772 solution for us. It would also be useful for Leaf, Volt, etc., owners.
There are a number of federal grant programs out there to get free J1772 charging stations, through
ChargePoint America or
The EV Project, plus a few others. As I understand it, if you can get funding for running the wiring to the charge location, the grants pay for the charger itself.
So, here's the ideal plan: have your company run wires capable of delivering 240V/100A to where the charger will be located. Apply for a grant to get a free ChargePoint or Ecotality charger. These chargers only need a 40A circuit, because they only deliver 30A instead of the full 80A allowed by the J1772 spec. Some day, it may be desirable to install a full 80A charger and it will be a lot easier and cheaper to do that if you don't have to run new wires.
If your company is serious about supporting EVs, I'd recommend
this document (PDF) from the Puget Sound Regional Council
model guidance for EV infrastructure which is partly specific to Washington state, but has great advice on recommended signage, handicap access, etc., see pages 24-27.
Finally, beware of putting EV charging in an especially desirable parking place. That often leads to resentment and having the spot taken by someone who doesn't need charging: an obnoxious ICE owner, a confused Prius owner, or an EV owner who just wants the parking. It's the wisdom of the experienced EV community to put EV Charging in places where it will get used for charging and not just parking.