First Time EV Owner - New Emporia Classic at 48A. Is this too hot?

[25StarWhiteLightning]

Just got my Ford Promise charger installed (Emporia Classic hardwired for 48A). During install they told me they planned to install 6/2 romex and I told them they can't for full rating on 60A breaker so they agreed to switch to MC cable.

I am doing a charge from 70% to 100% (road trip tomorrow) and checked on it about every 15 minutes. I noticed the cable and breaker were getting warm. At about 1 hour in I took some temperature readings. The breaker was about 122F at the surface of the breaker and the cable was about 123F where it was sitting wrapped around the charger.

Two questions:

1. Is the 60a breaker getting too hot?
2. Is the cable getting too hot?

I read the Emporia manual it doesn't specifically say the cable needs to be unwound during charging, but it might make sense (although a huge nuisance) to unwind it.

What is everyone else seeing?

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[25StarWhiteLightning]

Garage ambient was probably 73F.

 

[bmwhitetx]

I've never measured it but I would expect it to get a little warm. Will depend on ambient of course.

I have that charger on a 60A breaker as well and I typically use the Emporia app and change amps to 40A. It's overnight and I'm not in a rush so no need to run at the limit. I will if I need to. Heat produced is I squared R, so reducing the current reduces heat by the square.

 

[25StarWhiteLightning]

Good idea on setting the power down. I was really wanting to stress test it as it was just installed. I will likely be good with derating to 40A as well.

Would love it if someone else could measure their temperatures after about an hour of full bore charging.

 

[mattbrac3]

I cannot speak to the 60A specifically, but I know when I am charging at 38A from my wall charger, the cable and breaker do get warm, but so do my other breakers for the A/C and such when they are running at full tilt in the summer. Not sure if that helps or not.

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