Probably the best selling unit out there is the Clipper Creek HCS 40P. It has a NEMA 14-50 plug on the end, you can take it anywhere you go, and plug in at RV parks, etc, also, in rural areas. 25ft cord, I believe, which is a very nice length of cord to have. The electrician would wire the outlet for a NEMA 14-50 outlet, with a 50 amp breaker, allowing 40 amps max continuous current, electrical 80% max of rated circuit breaker and dedicated end run load. If you buy an SE with the 7.x kwh charger option on board, or any SEL model, 3 hours at home on 240V should completely fill up the charge on your battery at 30 amps with this unit.
I have one, new in box, for sale. PM me if interested, it needs a good home. The unit I am selling is UL approved. That means if your house burns down from use of it, your insurance will cover the damage... not so with some of the kit units. Some utility companies are buggers about this, LADWP here in Los Angeles being one of them.
For the tax credit, see your accountant before 4-2017, and tell him you bought an electric car and qualify for the $7500 tax credit.