Checked the web site - you make $100 for every 1000 kw/h. So you buy their charger for $300, and in your case you're making $120/month or break even in 3 months on the charger??? Sounds like a no-brainer, but what's the catch and why would anyone not want to go this route?
As for the outlet, if I'm running expensive cable from one side of my house to the other to get to the garage wall, is there anything in the electrical code stopping me from having 2 outlets on that circuit - one for inside, and one for outside? Or do I need two separate circuits?