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I just had a 14-50 outlet installed, 50A. Using the mobile connector bundled with my refreshed 70D, I am charging at around 230V and 40A, and can't select more than 40A on screen. Should it run at 48A?
Thanks for the info, everyone. If I had asked for a 60A circuit, would the UMC have then supported 48A?
No. You're dealing with three discrete limits here, the lowest of which sets your maximum.
The first limit is the car's maximum capacity, which in this case is 48A (upgradeable to 72 Amps after delivery by giving Tesla more money.)
The second limit is the maximum capacity of the charging hardware itself. For the UMC, that's 40A. For the HPWC, that's 80A. J1772 systems can be anywhere from 6A to 80A.
The third limit is what the charging hardware is set to so as to protect the wires. This is carried by the J1772 protocol to the car - on the UMC, the different plug adapters for it have different limits coded into them and automatically change this signal when you switch plugs.
To go higher than 40A, you really need a dedicated hard wired EVSE like the HPWC (which can be set on installation for anything from 12A up to 80A if I remember right.)
This must be why Tesla took dual chargers off the order page when the car previously had a 40A charger or the option of dual chargers. No matter how clear the explanation on the Tesla website site charging page, the order page, and I'm sure from the Tesla rep if the buyer ordered it in a store, this just goes right past some people who don't understand it or don't think they need to pay attention to such details.
I'm well aware of that. I was referring to the dual chargers because people had the same misunderstanding then as they do now with the 48 or 72A chargers regarding when they get the benefit of that and when they don't.Tesla changed to delivering a single charger that is capable of 48 or 72 amps, depending on the software option chosen. Using a UMC limits things to 40 amps.
And it frees up the destination charger HPWC for another person to use.40A. It gives you a chance to get back on the road faster.
However we only charge at 50A 99% of the time to keep the temperature on the HPWC, the HPWC cable, and our P85D charge port cool. Charging at 80A heats these items up quite a bit which will probably shorten their life.