I Installed mine in my garage myself - had the main house panel there. Followed this video:
A few who have installed outside the garage have just run the conduit through the wall and into a weatherproof box that the charger plugs into. I just ran the conduit to a plug receptacle I installed inside right next to the garage door - I normally plug the car in, inside the garage, but can run the charger cable under the garage door and plug in outside if needed..
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 19 inch Rial X10-i wheels, EVoInnovate EVSE