Believe it or not yet another EVSE question

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electrofelon

electrofelon

Senior Member
Location
Cherry Valley NY, Seattle, WA
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Electrician
Are there EVSEs that take over a 50 Amp circuit? How common? I assume they would be hardwired. If you are running a circuit for future use is it worth considering running something larger than 50A/#8 THHN?
 
Yes and no...
My limited opinion gets overlooked with the current discussion because every week I mention the ways I do my installs and the same 3 people do theirs similar. Then 75% say they just run something non compliant and then say the inspector let them so they do.
 
electrofelon said:
Are there EVSEs that take over a 50 Amp circuit? How common? I assume they would be hardwired. If you are running a circuit for future use is it worth considering running something larger than 50A/#8 THHN?
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Yes there are EVSEs that are over that threshold but not common in residential applications, up to 80Amp that I've seen with the companies I delt with. Yes they would all be hardwired.
Tesla and Charge Point both have specified by MFG for installation using #6 copper only for the hard wired. Interesting that they have their Terminals rated to 105o C yet no way to really size wire to that as the weakest point then is the breaker at 75o.

If wiring to potential future use, I would run the larger wire to allow for the use of the larger bidirectional charger. The push from auto makers is added features that allow the vehicle to be a backup power source as well. But if you are just terminating into a receptacle no need to go larger.
 
Tesla Wall Connector Gen 2 (I believe no longer made) would do up to 80A continuous / 100A branch circuit. I believe that's the maximum the J1772 standard supports.


Tesla Wall Connector Gen 3 is up to 48A continuous / 60A branch circuit.


Anything above 40A continuous / 50A branch circuit is required to be hard-wired per NEC 625.44.

These days there's enough 48A continuous / 60A branch circuit EVSEs around that for extra future proofing that would be worthwhile. But 40A continuous / 50A branch circuit and 30A/32A continuous / 40A branch circuit are a lot more common.

Cheers, Wayne
 
I haven't heard anything myself, but are there any rumblings among POCO's about instituting demand charges for homes with EV charging stations?
 
wwhitney said:
Tesla Wall Connector Gen 2 (I believe no longer made) would do up to 80A continuous / 100A branch circuit. I believe that's the maximum the J1772 standard supports.


Tesla Wall Connector Gen 3 is up to 48A continuous / 60A branch circuit.


Anything above 40A continuous / 50A branch circuit is required to be hard-wired per NEC 625.44.

These days there's enough 48A continuous / 60A branch circuit EVSEs around that for extra future proofing that would be worthwhile. But 40A continuous / 50A branch circuit and 30A/32A continuous / 40A branch circuit are a lot more common.

Cheers, Wayne
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I have a situation where I need to install conduit and run a circuit for future EV. There will be other stuff in the circuit so I will pull the wire now to avoid having to redo it. I think I'll pull number six then just to be safe.
 
electrofelon said:
I have a situation where I need to install conduit and run a circuit for future EV. There will be other stuff in the circuit so I will pull the wire now to avoid having to redo it. I think I'll pull number six then just to be safe.
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consider this:

625.40 Electric Vehicle Branch Circuit.
Each outlet installed for the purpose of supplying EVSE greater than 16 amperes or 120 volts shall be supplied by an individual branch circuit.
Exception:
Branch circuits shall be permitted to feed multiple EVSEs as permitted by 625.42(A) or (B).

(A) Energy Management System (EMS).

(B) EVSE with Adjustable Settings.
 
Fred B said:
consider this:

625.40 Electric Vehicle Branch Circuit.
Each outlet installed for the purpose of supplying EVSE greater than 16 amperes or 120 volts shall be supplied by an individual branch circuit.
Exception:
Branch circuits shall be permitted to feed multiple EVSEs as permitted by 625.42(A) or (B).

(A) Energy Management System (EMS).

(B) EVSE with Adjustable Settings.
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Sorry, I meant "other stuff in the conduit." It will be a dedicated circuit.
 
I have a Ford Connected Charge Station which is 48A max requiring a 60A circuit and a Ford Charge Station Pro which is 80A max requiring a 100A circuit. Both are hard-wired only per the installation instructions. Both have hardware switches inside that can be used to set a lower maximum current to allow a lesser branch circuit.
 
retirede said:
I have a Ford Connected Charge Station which is 48A max requiring a 60A circuit and a Ford Charge Station Pro which is 80A max requiring a 100A circuit. Both are hard-wired only per the installation instructions. Both have hardware switches inside that can be used to set a lower maximum current to allow a lesser branch circuit.
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I did one of the 100 amp circuit ones. Wasn't impressed with the bottom entrance into the enclosure. It's at a 22° angle and there is no option for top.
 
letgomywago said:
I did one of the 100 amp circuit ones. Wasn't impressed with the bottom entrance into the enclosure. It's at a 22° angle and there is no option for top.
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Yeah, tell me about it!
cb5a66201c439d85649bc1b6d8e13893.jpg


I think the reason for no top entry is due to a combination of weather-tight requirement and cheapness.
 
electrofelon said:
Are there EVSEs that take over a 50 Amp circuit? How common? I assume they would be hardwired.
If you are running a circuit for future use is it worth considering running something larger than 50A/#8 THHN?
Click to expand...
Well you have less wire loss.
If it's a home or office charger, consider the dwell time. If you have a few hours to deliver the power then 50A+ is mostly bragging rights.
If it's a short term charger, then 50+ might make sense, but very very few vehicles can currently do that on AC power.
 
brycenesbitt said:
Well you have less wire loss.
If it's a home or office charger, consider the dwell time. If you have a few hours to deliver the power then 50A+ is mostly bragging rights.
If it's a short term charger, then 50+ might make sense, but very very few vehicles can currently do that on AC power.
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The one most prevalently sold today is the F150 Lightning with extended range battery. It has dual on-board chargers capable of 80A total. The Charge Station Pro is included that can provide that 80A.
But starting in 2024, I’m told they will stop providing that and the truck will only have a single 48A charger.
 
retirede said:
The one most prevalently sold today is the F150 Lightning with extended range battery. It has dual on-board chargers capable of 80A total. The Charge Station Pro is included that can provide that 80A.
But starting in 2024, I’m told they will stop providing that and the truck will only have a single 48A charger.
Click to expand...
Thats what tesla basically did. They probably had some limitations on the amount of services they could be installed in
 
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