I came from a Nissan Leaf, and had a previous EVSE installed in my garage that required a 6-50 outlet.
It's actually pretty common for other EVSE manufacturers to offer 6-50 models including the following:
-ChargePoint Home
-ClipperCreek (offers various NEMA options)
-GE WattStation
-Bosch PowerMax2
-AeroVironment EVSE-RS
-Siemens VersiCharge.
I think the leaning towards a 6-50 vs. 14-50 is that for a new install specifically for EV charging, you can omit the neutral conductor. Depending on the length of the run, and assuming 6AWG wire, this may be non-trivial savings. If you're paying an electrician to do it (vs. if you're skilled enough to install outlets like this yourself), there probably won't be very much savings in labor. But once you factor in the cost of the extra adapter, you'll probably come out even. But like
@MIT_S60 said, if you previously had a 6-50 installed for a non-Tesla EV, it's probably cheaper to buy the 6-50 adapter for a Tesla, than paying an electrician to come out and swap the outlet (
especially if it's a long run and they now have to add a neutral wire to make it a legal 15-40 outlet).
Me personally, I have a variety of reasons:
* I'm OCD, so want a complete set (yeah, this is probably the biggest reason)
* I don't live in California, so public EV charging is not plentiful. good to keep your options open
* Sometimes I travel to places that don't have any EV charging at all. good to keep your options open
* I'd be kicking myself so hard if I
needed to charge, a 6-50 was miraculously available, and I didn't have the adapter, and instead had to take the major inconvenience of finding an RV park (or heck, even a supercharger. I'd rather charge at my destination than at a supercharger, if at all possible)
Yeah... those last three are really the same thing, and will likely never be a factor in reality. So I'll admit, it's all because I'm OCD
. I can't even claim that I plan on saving money on wire for a new construction home we're building soon. Cause I plan on doing wall connectors on a shared 100A circuit. And if I add an extra outlet "just-in-case" it'll be a 14-50, because it might as well be just-in-case for an RV, too.