So my wife and I will soon take the plunge for a Model S and I'm wanting to get the garage prepared. My goal is to have a HPWC and a NEMA 15-50 outlet, in case something goes wrong with HPWC. My main panel is in my garage but there are only 3 slots available. I have a sub panel on backside of garage, outdoors, with 2 slots open. So my question is, what's the best way to configure my wiring setup given what I have in the panel and what I want for charging? Pics of panel below....