Will a NEMA 14-50 plug handle 10kw?

[bj33813]

Bought a Tesla Gen 3 wall charger with the universal J-1772 connector instead of tesla connector & had planned to hardwire, but then 2nd thought if it ever goes bad, I want to be able to use the Porsche evse using the 14-50 plug. It's on a 50 amp breaker , using #6AWG.

But in looking at specs for the 14-50 male plug, I am concerned whether charging at 40 amps & 9.6KW would carry it. Specs for those that list them show a max of 7KW. Some feedback please.

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[xyeahtony]

a NEMA 14-50 can draw a maximum of 40 Amps continuous. 40A x 240V = 9600W = 9.6KW. That's under ideal circumstances. Usually with voltage drop during heavy use you get between 235-240V

The Porsche EVSE will draw a maximum of 40A using a nema 14-50 adapter. Due to safety concerns, it automatically defaults to 20A and you have to set it to 40A everytime.

Due to NEC code requirements, nothing can "legally" draw more than 80% of the rated circuit "continuously" so you're not going to find an EVSE sold out there that draws more than 40A thru a nema 50amp plug.

That being said, if you somehow do manage to draw more than the 9.6kw and draw 10kw, the plug can technically handle it but expect some overheating problems from extended use.

 

[daveo4EV]

Bought a Tesla Gen 3 wall charger with the universal J-1772 connector instead of tesla connector & had planned to hardwire, but then 2nd thought if it ever goes bad, I want to be able to use the Porsche evse using the 14-50 plug. It's on a 50 amp breaker , using #6AWG.

But in looking at specs for the 14-50 male plug, I am concerned whether charging at 40 amps & 9.6KW would carry it. Specs for those that list them show a max of 7KW. Some feedback please.

private message sent - @xyeahtony post is excellent.

 

[daveo4EV]

Bought a Tesla Gen 3 wall charger with the universal J-1772 connector instead of tesla connector & had planned to hardwire, but then 2nd thought if it ever goes bad, I want to be able to use the Porsche evse using the 14-50 plug. It's on a 50 amp breaker , using #6AWG.

But in looking at specs for the 14-50 male plug, I am concerned whether charging at 40 amps & 9.6KW would carry it. Specs for those that list them show a max of 7KW. Some feedback please.

as long as you have the hubble 14-50/6-50 sockets they are rated for full 9.6 kW load - no issue.

 

[bj33813]

I was looking past the obvious. Found a range cord with the 4 wire plug rated at 50 amps, using 6 AWG wiring at Home Depot, so should carry just fine.
Thanks for the response!

daveo4EV:
Yes I do! Read all your posts. I found it interesting when testing the Tesla unit at default 48 amps until I could get into the "app" to reset it to 40 amps, it charged fine at up 11.5KW according to the car display, but maybe that only shows what is available, not what is consumed?

 

[daveo4EV]

follow the advise in this document from Porsche and you should have no issues…

https://www.taycanforum.com/forum/t...-related-porsche-ntsb-article-analysis.13902/

get the hubble socket…

https://www.amazon.com/Hubbell-HBL9...685217743&sprefix=hubble+14-50,aps,168&sr=8-2

 

[daveo4EV]

I was looking past the obvious. Found a range cord with the 4 wire plug rated at 50 amps, using 6 AWG wiring at Home Depot, so should carry just fine.
Thanks for the response!

daveo4EV:
Yes I do! Read all your posts. I found it interesting when testing the Tesla unit at default 48 amps until I could get into the "app" to reset it to 40 amps, it charged fine at up 11.5KW according to the car display, but maybe that only shows what is available, not what is consumed?

in car shows what is hitting the battery - not the "raw" kW's

with 40 amps @ 9.6 kW the in car shows about 8.8 kW (the loss is charging overhead)
with 48 amps @ 11 kW the in car for me shows about 10.6 kW (the loss is charing overhead)

you know you're getting the faster/fastest rate because it's more than the 9.6 kW maximum for 40 amps.

the Tesla EVSE webportal will show "raw" power during a charging session if you log on during charging IRC…

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