A Nema 14-30 outlet is fine with the portable charger, right? I just buy an adapter for $25? I just had a Tesla approved installer tell me it won't work. I also read a thread somewhere saying Tesla stopped selling the adapters. I'm leaning this direction because my garage sub-panel will support a 14-30, but not a 14-50. 14-50 requires running a new line from the main panel 120 feet away and over double the price. I don't see the point since my car will charge overnight either way.