I just made a deal on a 2015 P85D with dual chargers. I'm not really sure what that means. Can someone shed some light not only on what they are, but what kind of electrical should I be installing in my garage? Is it still a normal 220V socket or am I going to have to install two or what? Sorry if its a dumb question. Tesla doesn't archive info for older models on its site so I can't just rtfm (well, maybe I can... still Googling. Figured I'd ask in the meantime).