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What charging install should we have ready for the car's delivery?

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While it is impressive you were able to find a Hubbel outlet for $45, the rest of the costs don't make any sense. This sounds like you don't have the required GFCI breaker. That is about $130, as @ATPMSD was pointing out.
So with just $45 for your outlet plus $130 for the breaker, that is $175 in parts, before even adding in the wire or conduit cost. That puts it to about $200 or more just for the parts only. An electrician bid and showed up and did the work for twenty bucks? That doesn't make sense.

That GFCI breaker cost is the big gotcha now that code requires it, which makes the outlet job so much more expensive than it used to be. So there really isn't any cost advantage for the outlet anymore.
In the case I present, I re-purposed a dryer circuit. Existing wiring was disconnected but left in place.
New wiring to the 14-50 Hubbell was added and new breaker installed.
I already had a breaker so you're correct, and I don't know the cost - came with the house ;-)
Also, I used 1" conduit and a junction box sourced at HD, but it was a short run. That I installed DIY.
The electrician charged $225 and supplied all conductors, did the wiring detach / install / breaker replacement.
Still, my outlay was just under $300.

This work was accomplished in early Dec 2021, just as the EV rush was kinda getting traction, and actually well before I took delivery on a MYLR.
$45 price on Hubbell was the distributor's std $$, no special deal. I just knew to go to an electrical specialist, not HD.
I haven't looked at costs for Hubbell recently, but demand has definitely risen.
Also, electricians locally have been noted for charging upwards of $800 for an EV service install - because SoCAL Edison will credit that to users that qualify.
I don't qualify, for whatever reason, but electricians are businessmen....

Basically the difference between WC and Mobile Connector boils down to the breaker now, if you assume electrican fees are the same.
But I see the MC as a more flexible solution.
The charging speed difference isn't critical since 99% of charging is overnight, and you can take the MC with you on a trip.
Although I've yet to unplug the MC( I got with the car) from the Hubbell socket.... ;-)
 
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Thank you! I am looking at that option on the websiste: Home Charging

Does that mean it is just an adaptor that you attach to your standard outlet and the charging cable the Tesla comes with plugs directly into? What is the installation cost for? Seems like you could also take it elsewhere with you or if just plugs in?
I think. The NEMA 14-50 that is now $45 but was included when I got my car. Gen 2 NEMA Adapters
 
While I agree a GFCI is safer, it is not required in most jurisdictions as most have yet to adopt the latest code.
This needs clarification. It wasn't the latest code that required it. It was two versions ago. There are only 10 out of the 50 states that haven't gone to version 2017 or later that require this.

And as such the author is likely adhering to the latest codes for his area.
That's definitely not true. He lives in California, which does use NEC 2017, so it is the requirement now. But you may just not be familiar with this person's posting history. He has this ongoing thing of ridiculing people now because he did what he did DIY and cheap back when code requirements weren't like this and were cheaper. It's not relevant to what the situation is now, and is harmful to tell people it's what they should do by violating code.