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Home Charging Model X 75D

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Cost to run will still be the amount of kW used either way, regardless of whether it's faster or slower charging.
No, slower charging uses more kW to achieve a given number of miles added, because it’s less efficient. There is overhead to running the charging circuit. That’s why, for 120V outlets for example, it’s been shown for Model S that charging with the 5-20 adapter at 16A gives 43% more range than charging at 12A with the 5-15 adapter, even though it’s only 25% increase in amps.
 
We have a 2017 MS 75D and installed a NEMA 14-50 outlet in our garage and bought Tesla's corded mobile connector that we keep attached to the outlet all the time and keep the one that comes with our car in the car. We use Tesla's cable organizer to hold the hose and the charging handle. We're fine charging overnight, even set it lower than we need to for a slower charge. We liked the more minimal look of the outlet with plug (1-1/2 inches deep) over a mounted wall charger as our garage is a bit narrow with everything in it and a little bit easier to walk past. The lit portion of the mobile connector is 2 inches deep so pretty low profile against the wall. And we're not likely to hit our head or shoulder into it if we need to squeeze past it.

If your electrician has already given you your options for each and they are about the same cost, it's kind of a toss up. Even with the wall charger can you set it for a slower rate of charge, but it would allow you to increase the rate above what a 14-50 would give you at max allowable. Placement is a consideration, inside or outside. If outside do you care how visible it is and accessible to anyone. We installed our 14-50 indoor garage outlet close enough to our driveway that when we lower our garage door (we add two pieces of wood blocks on each side of the cable to make sure the cable isn't crimped), and we can charge indoors or outdoors which is nice if company would need a charge in the driveway. Plus we don't have to worry about the weather or keeping the electricty locked up.

Congrats on the new car!
Good info! Thanks for sharing. Still thinking it over!
 
That can't be right. There's no way the 48A gets 26 mi/hr while the 32A gets 22 mi/hr. 48A is 50% more than 32A.

According to Home Charging Installation, 48A is ~30 mi/hr and 32A is ~20 mi/hr for a model X, which makes way more sense.

Sorry I don’t have any HPWC set at 48A to get the realistic result. But here is my UMC.
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Don't forget the HPWC is really cool looking.

If I am being honest, that is the only reason we are installing a HPWC.

We had a new 50 A circuit installed when we did a remodel. We are leasing our MX75 because in 3 years there will be more options. At that time if Mercedes, BMW, ... has a better option, we will go with them and have to pay to replace the HPWC with another cool looking connector on the same circuit.