That chart Jeff posted is accurate. I wired up a charger for my brother in his garage. I used clothes drier receptacle from Lowes, cost $17. I used solid copper wire, according to Tesla specs, I think it was 10 gauge, this was a year ago I don't remember exactly. It is 220 with a 40 amp breaker. Brother gets 23 miles of travel for one hour of charging.
Your idea is great, if you could charge your Tesla up with solar cells you would really have something. How big of a solar panel would you need to deliver that much juice?
By the way my brother loves his Tesla. He has a real nice Nissan Frontier, he hardly drives the pickup any more. As you said, great for the 120 mile day trip, not good for a long trip. He drove the Tesla to Atlanta for Christmas, 220 miles, had to stop on the way down for a 20 minute charge, stopped on the way back for a 30 minute charge.
