I am located in Toronto, Canada. The main electric panel is my house is only rated at 100 Amp. I am planning to install the NEMA 14-50 plug in my garage. 1. Given that I am planning to charge the Model S at night when the electric load / demand is lower. Will my 100 Amp main panel do the job or do I need to upgrade it to 200 Amp? 2. Do I need a 50A breaker or a 40A breaker for this new NEMA 14-50 plug? Thanks!!