I am a new Spark EV owner and I just got a call and an email from a guy at Bosch offering me the rebate on a Level 2 charging station. It sounds good, but I would like to get advice. I'm wondering what the difference is between the "free" 16 amp station and the 30 amp stations? What should I expect to pay for the installation? Can these stations be outside (like on the side of my house next to the driveway)? How well do these charging stations perform? I could probably live without it since I use my EV as a city car and don't have to charge that often. I live in Salem, Oregon, if that makes a difference. Thanks!