Your Tesla Model Y should have come with the Tesla SAE J1772 adapter. This adapter is how you currently charge at home with the portable charging unit you currently plug into the 14-50 receptacle. The J1772 adapter is available from Tesla store if you want a spare. You can use the J1772 adapter to charge at any public Level 2 charging station (See Plugshare app for locations).
What mobile charger do you have that “only” works with 50A service? What is the output? If it “only” outputs 40A that will not work with cars that only accept 32A or less (SR Teslas and many others).
That definitely isn't how that works. To be an EVSE that complies with J1772 standard, it CAN'T work that way. It will announce to the vehicle how much possible capacity of amps it can provide. But then the car REQUESTS an amount of those amps that may be lower, and the EVSE provides that much. They don't FORCE something into the car that is more than the car can take.
I know and you know this. The poster obviously does not. That is what I was trying to kindly explain through asking him questions. And since it has a 14-50 plug, all he needs are adapters from whatever plug is available to a 14-50 receptacle and he is good to go. He will need to manually set amperage in the car to be 80% of whatever the plug is providing.
Then why did you say, " that will not work with cars that only accept 32A or less" That's just not true. Yes, it will work. Even if the EVSE someone is using is capable of more, it will always still work with cars that can only take less amps, and that won't require manually turning down the level in the car. The car will only request as much as it can use. The EVSE won't force more.
I'd think hard about whether you even need an EVSE to carry in the car. You say you need it for when you're "out of range for a Supercharger", but commercial EV charging stations use J1772 plugs, which Tesla provides an adapter for. The only need for a mobile EVSE would be plugging into a electrical socket at someone's home, in an RV park, or other unusual locations. Given the ubiquity of EV charging these days, most people don't need anything else.
I was using his logic to prove to him that he was wrong. If it works for his Tesla, it will work for all Teslas, even ones than can't accept more than 32A. The conversation was with the specific poster and designed to draw answers from him to see the error in his thinking and help him realize that his current charger will work everywhere given the correct cord adapter and settings in the car. The Tesla Mobile Connector will simply the settings portion given the right adapters but it is a cost that will not provide additional functionality regarding charging that he doesn't already have.
Use the ground as a ground and cap off the neutral. Less confusing and error-prone for someone stumbling across your work in the future.
Stranded conductors for the hot wires. A solid ground is fine (and expected).
You mean inside the wall connector? I wouldn't. There shouldn't be extra wire hanging around that could contact the other terminals. You should also only strip the hot wires to the specified length, not letting extra bare wire protrude out the bottom or top of the terminal.
Your electrician should be able to mount the Wall Connector mounting plate to the existing junction box.
You can also mount the wall connector near the J-box and run a pigtail out the side or bottom and into the wall connector.
