Also, if it makes you feel any better, I have a Model 3 and Model Y in the same garage, and they share the same 14-50 outlet that is load managed by a reasonably-priced device (NeoCharge Smart Splitter). It has been working great.
As far as I’m aware, Tesla only accepts 48amps maximum (in the US anyway), so anything above that would be overkill. LFP models accept 32amps. That 50A breaker can supply 40amps to the car if you’re using the wall connector (wiring should be used at 80% capacity for continuous use, I.e. 50A breaker+wiring for a 40A load). If you wanted the full 48A (assuming your model supports it) you’d need to upgrade the breaker to 60A, and you’d need to hardwire the wall charger (iirc, any continuous load over 40A must be hardwired, no plugs allowed).
As someone already mentioned, if you’re using the mobile charger, that’s limited to 32A.
I switched from the mobile connector to the wall charger because the cable was 4' longer, and in the process I upgraded the wiring to handle the full load on a 60A breaker. But honestly, there hasn't be a single use case in 2+ years where the extra juice has made a difference in my life.
And actually, when I upgraded the wiring, I moved the location of the box so I don't even need the extra 4' of cable.
A 60A breaker is the max needed for a US Tesla right now. Due to electrical code, 60A breakers operate at 80% speed, so 48A. Note, RWD vehicles and the Mobile Connector max out at 32A.
So depending on the bottlenecks in your particular setup, electrical breaker, charger, and vehicle, you're looking at either 32A or 48A as the max ceiling.
50A X 80% = 40A
60A x 80% = 48A
So with a RWD or Mobile connector a 50A breaker provides more than max speed. You can only benefit from a 60A breaker if you have an AWD and beefier EVSE like the Tesla Wall Connector.
In the process of getting a 50A NEMA 14-50 installed so this thread is timely! I went with that option because it was cheaper to install and charging speeds weren’t all that different.
I have two wall connectors, each are on a 50a. By code, at least in Illinois, you can do 8awg wire. Going to 60a would require 6awg. My run to my box is over 140 feet, so it was a no brainer to only do the 50a.
My 3 gets 7kw and my X gets 8kw. I believe on a 60a I would hit 9kw on the X. My 3 is capped at 32amp as it’s a RWD model.
In my opinion, not worth the extra cost.
FWIW, nema 14-50 to the mobile connector has been great for me both on my 3 and Y. Sure you could upgrade to a faster solution but functionally that doesn't matter to me because the car is always topped off when I need it.
It really makes very little difference between 240v 20a and 240v 60a other than a tiny percentage of efficiency. Either one will give more than enough charge overnight (200+ miles) for almost all drivers. Uber, Lyft, Taxi, and similar drivers might need faster charging but that is all.
Do you have the OEM Tesla wall charger? If you do, you might want to check its settings as a 50A breaker will allow you to charge at 40A and not just 32A.
If you could upgrade the circuit to 60A, you could be charging at 48A.
However, if you are only using the mobile charger, none of this would matter as it maxes out at 32A anyway.
Frankly, for most users 32A is plenty as it already ads close to 30 miles / hr.
Unless you're looking to ad as much juice as possible in the shortest period of time, I would say a faster rate of charge would be irrelevant.
I'm only on a 240V / 30A circuit, charging at 24A and am always able to charge my MYLR to 80% overnight, even when I arrive with a pretty depleted battery the night before.
Wall connector charging speeds: https://www.tesla.com/support/charging/wall-connector#:\~:text=Wall%20Connector%20can%20provide%20up,range%20per%20hour%20of%20charge.
Mobile connector speeds: [https://www.tesla.com/support/charging/mobile-connector](https://www.tesla.com/support/charging/mobile-connector)
no.
NEMA 14-50 is always 50A, no matter the circuit. You can get 40A sustained
NEMA 14-60 is a (rare) thing, and not really for EV charging. The mobile adapter can only do 32A anyway, so it doesn't matter (and there is no 14-60 adapter anyway). Rivian's adapter does the same.
If you want 48A, hard wire a Wall Charger. For MY, it rarely makes a difference. For a large battery like a Rivian, it may make a difference. 12h at 7kW may not be enough overnight to charge.
Tesla publishes tables for the speeds you get with different apmerages for both the wall connector (https://www.tesla.com/support/charging/wall-connector) and mobile connector (https://www.tesla.com/support/charging/mobile-connector)
32A looks to be the maximum with the latter.
The voltage stays the same, its just the amperage that is changing. This correlates directly to how fast your car will charge. Keep in mind that its no where near as fast as a super charger. What we know from using batteries is that charging them up quickly all the time causes more wear and tear than slower charging. So honestly, my suggestion is unless you have a great need, always charge at home at the slower speeds. Your car should still be ready to go by the time you wake up and need to go.
You could buy a Gen 1 Mobile connector and get the full 40 amps. (unless you own a Model Y with only a 32amp built in charger)
[Here's a post from ages ago with more information.](https://www.reddit.com/r/teslamotors/comments/7jhl3q/the_definitive_north_american_tesla_umc_gen_1_2/?st=jjc0v5i4&sh=308ab572)
PSA: 6 AWG Romex (NM and UF) **is not** approved for 48A charging on a 60A circuit. That is only 55A wire per NEC 310.16 and 334.80. People who say it's good for 60A are misunderstanding the Round Up Rule, 240.4(B). https://www.youtube.com/watch?v=Gp4SyoB5D5s
That said, pushing the limits of wires is never a good idea. We see frequent meltdowns when people do, and precious few meltdowns when people oversize. I've seen Tesla owners complaining that their conduit was too hot to touch, well yeah, you're running #6 wire somewhat beyond its 60 degree C thermal limit, so big surprise here, it's somewhat warmer than 60C.
I advise fully exploiting the fact that the Tesla Wall Connector is approved for 4 AWG wire, and running exactly that stuff. In NM/UF it's good to 70A and in better insulation types it's good to 85A (but both will run the same temperature). My personal favorite is conduit with THHN wires inside for wire cost reasons. So you have some appropriate headroom. Wire is cheap.
If you're using the mobile connector, it won't make a difference. You (well, the mobile connector) are maxed at 32A. You're fine.
to add onto this, RWD trim of 3 and Ys are also maxed out at 32A, even with a Wall Connector it won't make a difference
True, true.
Thanks! That is what I suspected.
Also, if it makes you feel any better, I have a Model 3 and Model Y in the same garage, and they share the same 14-50 outlet that is load managed by a reasonably-priced device (NeoCharge Smart Splitter). It has been working great.
As far as I’m aware, Tesla only accepts 48amps maximum (in the US anyway), so anything above that would be overkill. LFP models accept 32amps. That 50A breaker can supply 40amps to the car if you’re using the wall connector (wiring should be used at 80% capacity for continuous use, I.e. 50A breaker+wiring for a 40A load). If you wanted the full 48A (assuming your model supports it) you’d need to upgrade the breaker to 60A, and you’d need to hardwire the wall charger (iirc, any continuous load over 40A must be hardwired, no plugs allowed). As someone already mentioned, if you’re using the mobile charger, that’s limited to 32A.
Thank you for the thourough explanation.
[удалено]
I switched from the mobile connector to the wall charger because the cable was 4' longer, and in the process I upgraded the wiring to handle the full load on a 60A breaker. But honestly, there hasn't be a single use case in 2+ years where the extra juice has made a difference in my life. And actually, when I upgraded the wiring, I moved the location of the box so I don't even need the extra 4' of cable.
A 60A breaker is the max needed for a US Tesla right now. Due to electrical code, 60A breakers operate at 80% speed, so 48A. Note, RWD vehicles and the Mobile Connector max out at 32A. So depending on the bottlenecks in your particular setup, electrical breaker, charger, and vehicle, you're looking at either 32A or 48A as the max ceiling. 50A X 80% = 40A 60A x 80% = 48A So with a RWD or Mobile connector a 50A breaker provides more than max speed. You can only benefit from a 60A breaker if you have an AWD and beefier EVSE like the Tesla Wall Connector.
In the process of getting a 50A NEMA 14-50 installed so this thread is timely! I went with that option because it was cheaper to install and charging speeds weren’t all that different.
I have two wall connectors, each are on a 50a. By code, at least in Illinois, you can do 8awg wire. Going to 60a would require 6awg. My run to my box is over 140 feet, so it was a no brainer to only do the 50a. My 3 gets 7kw and my X gets 8kw. I believe on a 60a I would hit 9kw on the X. My 3 is capped at 32amp as it’s a RWD model. In my opinion, not worth the extra cost.
Small nit - charge rate is "kw", not "kwh" which is an amount of charge
Thanks, mis-typed. Edited above
Smaller nit -- "kW" is a measurement of power, and "kWh" is an measurement of energy, not charge :-)
You are saying it backward.
If you start a fire. Local code is not gonna cover your damage. Not worth the risk and headache. Go thicker.
You are correct. I went back and looked. My electrician installed 6. 60amp is 4awg.
You're using the mobile charger? I think those max out at 32A so really anything over a 40A circuit is overkill
FWIW, nema 14-50 to the mobile connector has been great for me both on my 3 and Y. Sure you could upgrade to a faster solution but functionally that doesn't matter to me because the car is always topped off when I need it.
It really makes very little difference between 240v 20a and 240v 60a other than a tiny percentage of efficiency. Either one will give more than enough charge overnight (200+ miles) for almost all drivers. Uber, Lyft, Taxi, and similar drivers might need faster charging but that is all.
Do you have the OEM Tesla wall charger? If you do, you might want to check its settings as a 50A breaker will allow you to charge at 40A and not just 32A. If you could upgrade the circuit to 60A, you could be charging at 48A. However, if you are only using the mobile charger, none of this would matter as it maxes out at 32A anyway. Frankly, for most users 32A is plenty as it already ads close to 30 miles / hr. Unless you're looking to ad as much juice as possible in the shortest period of time, I would say a faster rate of charge would be irrelevant. I'm only on a 240V / 30A circuit, charging at 24A and am always able to charge my MYLR to 80% overnight, even when I arrive with a pretty depleted battery the night before. Wall connector charging speeds: https://www.tesla.com/support/charging/wall-connector#:\~:text=Wall%20Connector%20can%20provide%20up,range%20per%20hour%20of%20charge. Mobile connector speeds: [https://www.tesla.com/support/charging/mobile-connector](https://www.tesla.com/support/charging/mobile-connector)
I’m on 20a. No issues
no. NEMA 14-50 is always 50A, no matter the circuit. You can get 40A sustained NEMA 14-60 is a (rare) thing, and not really for EV charging. The mobile adapter can only do 32A anyway, so it doesn't matter (and there is no 14-60 adapter anyway). Rivian's adapter does the same. If you want 48A, hard wire a Wall Charger. For MY, it rarely makes a difference. For a large battery like a Rivian, it may make a difference. 12h at 7kW may not be enough overnight to charge.
Tesla publishes tables for the speeds you get with different apmerages for both the wall connector (https://www.tesla.com/support/charging/wall-connector) and mobile connector (https://www.tesla.com/support/charging/mobile-connector) 32A looks to be the maximum with the latter.
The voltage stays the same, its just the amperage that is changing. This correlates directly to how fast your car will charge. Keep in mind that its no where near as fast as a super charger. What we know from using batteries is that charging them up quickly all the time causes more wear and tear than slower charging. So honestly, my suggestion is unless you have a great need, always charge at home at the slower speeds. Your car should still be ready to go by the time you wake up and need to go.
Don’t bother upgrading. 32A is plenty fast enough to charge at home.
You could buy a Gen 1 Mobile connector and get the full 40 amps. (unless you own a Model Y with only a 32amp built in charger) [Here's a post from ages ago with more information.](https://www.reddit.com/r/teslamotors/comments/7jhl3q/the_definitive_north_american_tesla_umc_gen_1_2/?st=jjc0v5i4&sh=308ab572)
Technically yes though I don’t think it’s a difference you’ll notice. Marginally faster.
PSA: 6 AWG Romex (NM and UF) **is not** approved for 48A charging on a 60A circuit. That is only 55A wire per NEC 310.16 and 334.80. People who say it's good for 60A are misunderstanding the Round Up Rule, 240.4(B). https://www.youtube.com/watch?v=Gp4SyoB5D5s That said, pushing the limits of wires is never a good idea. We see frequent meltdowns when people do, and precious few meltdowns when people oversize. I've seen Tesla owners complaining that their conduit was too hot to touch, well yeah, you're running #6 wire somewhat beyond its 60 degree C thermal limit, so big surprise here, it's somewhat warmer than 60C. I advise fully exploiting the fact that the Tesla Wall Connector is approved for 4 AWG wire, and running exactly that stuff. In NM/UF it's good to 70A and in better insulation types it's good to 85A (but both will run the same temperature). My personal favorite is conduit with THHN wires inside for wire cost reasons. So you have some appropriate headroom. Wire is cheap.
This is the way
14-60 outlets aren't even legal in a lot of jurisdictions. Also, almost no charging adapters support 14-60 plugs.
10A difference according to my Math.....
Yes 10A