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The question is kind of backward. The wall connector is a switchable device that can be run on many levels of circuits, so it's more like pick what size circuit can fit within your electrical system first, and then install the wall connector on that.Getting the Tesla Wall Connector. I have a NEMA 14-50 plug installed currently. I am only charging 1 model S. What do I tell the electrician I need, a 40 or 60 amp breaker or higher?
Ah, because your whole answer went on the assumption that it was going to use the existing wire run in the place where it was without actually stating that, and which the OP didn't exactly state either, whether he wanted to use that wire or just put in a new circuit. Your further explanation makes sense now if you take the existing wire as a given.You seem to understand about this - so why am I having to explain myself?
The electrician will do the load calculation anyway, so it will be done, even if most homeowners know nothing about it. I was just giving the tip that the person can go ahead and pre-check on that ahead of time if they want, rather than having to wait and find out about it later from the electrician or just be wondering what they can or can't do. The person is here right now asking questions to get this information. Why should we hide the information about load calcs, which they can do ahead of time to be more prepared in deciding what they want to do? Forewarned is forearmed.You know that you are not supposed to running an electric stove after 1a when the car is charging. Exactly what percentage of the population has ever done a load analysis? Or even knows? I dare say as the millennials get older there will be more electrical problems because they don't have a clue about this stuff.
I don't usually recommend such shenanigans, but in your case, I'd be tempted to put a 14-50 or 6-50 receptacle on the wall and tell the inspector you're going to use the mobile connector... Then put the appropriate plug on the wall connector and plug it in.The variable settings on the wall connector are irrelevant if Los Angeles. You didn’t mention where you are, so it’s worth having your electrician double check the code. We installed my wall charger on a 50A circuit and the city inspector wouldn’t approve the install. Their read of the code is that because the device can utilize 80A, it has to be wired for it, regardless if you internally throttle it to 40A.
It’s turning into quite the headache, as it’s not quite as simple as changing the wiring. I live in a condo with a relatively low service amperage to my unit so adding a dedicated 100A line for it isn’t possible without installing a new line off the common power.
The size of the breaker is irrelevant - the size of the wire is the limiting factor.
The rated current capacity of the wire going from the panel to the plug / EVSE is the controlling limit- not the breaker.
Remember- most modern homes have a 200 amp supply, if you are running a 60amp breaker to a 60 amp line to a 48 amp constant load you're taking away 30% of the available current in the house.
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and you are at 180amps peak which far exceeds the sustained limit of your panel - and means you turn on a couple of computers, large screen TV's and a stove etc etc etc, i.e., normal household load, and you're gonna blow your main breaker.
LOL, my house was built in 1968, so as you can see, when I get an electric vehicle, I will definitely need to upgrade my main service panel!
View attachment 254003
A load Miser might be worth considering instead of upgrading your service to your house and your main service panel.
D-LM
I came across this article online which explains how it works. I am sure there are also other companies making these Load Misers.
Dividing available energy from your electrical panel
If you ran 6-3 as suggested by Tesla for your 14-50, then upgrade to a 60 amp breaker and set the hpwc to 48 amps.Getting the Tesla Wall Connector. I have a NEMA 14-50 plug installed currently. I am only charging 1 model S. What do I tell the electrician I need, a 40 or 60 amp breaker or higher?
This is only kosher if you used 75 or 90 deg C wire in conduit. 6-3 romex (NM-B) is rated for 55A intermittent/44A max. But the HPWC doesn't have a 44A setting, so you're limited to 40A charging with 6 ga NM-BIf you ran 6-3 as suggested by Tesla for your 14-50, then upgrade to a 60 amp breaker and set the hpwc to 48 amps.
My apologies, I thought it was understood that it would be in conduit if a post-build install. In other words, I don't hear often of people just running wire outside of conduit along the wall to hookup a charger or outlet. I'm fairly certain when I purchased the wire from home Depot, all they had was 90' C rated. In fact, I just checked, first Google result is the wire I purchased retail, 90 C rating.This is only kosher if you used 75 or 90 deg C wire in conduit. 6-3 romex (NM-B) is rated for 55A intermittent/44A max. But the HPWC doesn't have a 44A setting, so you're limited to 40A charging with 6 ga NM-B
The spools of THHN that I have are all 90 degree rated. But you're also limited to the lowest temp rating of all the wires, terminals, connectors, appliances, etc.My apologies, I thought it was understood that it would be in conduit if a post-build install. In other words, I don't hear often of people just running wire outside of conduit along the wall to hookup a charger or outlet. I'm fairly certain when I purchased the wire from home Depot, all they had was 90' C rated. In fact, I just checked, first Google result is the wire I purchased retail, 90 C rating.
That's odd, I could have sworn square d made a 90 amp qc breaker. I'm going back to check now to see if I was crazy.The spools of THHN that I have are all 90 degree rated. But you're also limited to the lowest temp rating of all the wires, terminals, connectors, appliances, etc.
I forget what the rating for the HPWC is, but I don't recall ever seeing a residential breaker rated for 90, so 75 is often the practical limit. But THHN in conduit is good for 65A at 75, so you're right, in that case you can charge at 48A.