I'm collecting quotes to have a NEMA 14-50 outlet installed in our garage. Model S to be coming soon! One of the Tesla-listed contractors came by today. We have 2 200 amp panels, so power isn't a problem. However, he mentioned that he's recommending that, for Tesla installs, residential customers upgrade their panels to commercial grade because of the 42 amp draw of the Tesla. Forgive me if I use incorrect terms...electrical work is NOT my strong suit. He said that that level of power draw can cause degradation of the connection to the bus which could lead to problems with the car not charging. There is no fire risk, just malfunction of the breaker and then damage to the panel which, if it happened, would REQUIRE a replacement panel. The commercial grade panel install would be about $1800. He invited me to do some research online, and I can't think of a better place to start than here. Our house was built in 2005. I've read many posts about people installing both NEMA 14-50 and HPWC, but nobody has ever mentioned having to upgrade their panel to commercial grade. I'd appreciate any input. Please let me know if I need to provide more information. Thanks!