14-50 charging 33/32 amps

[BuggDDS]

I’m charging at work like I usually do on a NEMA 14-50 outlet, and looking at the app, it says 33/32 amps. I don’t think I’m concerned, just wanted to share!

 

[gavine]

Might have something to do with it probably being a 208V circuit but it's putting-out 215V. Just a guess.

 

[Rocky_H]

I remember seeing some threads about this a few times over the years here on this forum. It's kind of rare, but does happen occasionally. I don't know if it was ever determined if there was something specific that causes this, or if it's just a display glitch that a reboot clears up. You can turn the amps down by 1 or 2 if you want.

Here are three threads that mention this behavior of it showing just barely over the limit of amps:
Charging stops after 5-10min

Charging over amp limit: 34/32A

Model 3 Charging 34/32 Amps

 

[BuggDDS]

Ah thanks! I did a search for “33/32” amps and nothing came up, I guess it’s the magic 34 amps!

 

[user212_nr]

As mentioned in one of the linked threads, you are charging at 7 kw, which is well below the 7.6 kw that the charger is capable of (240*32).

Before speculating as to why that is, it would be helpful to know why you are provided with 215 volts. There is a lot of other math like RMS and waveforms that go into determining how much power you actually draw.

The point being, the car's charger is rated at 7.6 kw (or similar number), and the car is only drawing 32A to meet that target. I don't know what the wire gauge is of the UMC, but clearly 32A is not its limit.

 

[BuggDDS]

Ohhhhh, I have a super heavy duty 10ft 14-50 extension cord plugged in between the mobile charger and wall outlet...math people, where ya at?

 

[nwdiver]

I’m charging at work like I usually do on a NEMA 14-50 outlet, and looking at the app, it says 33/32 amps. I don’t think I’m concerned, just wanted to share!

... what voltage does it read before you start charging?

 

[SigNC]

I’m running into this same anomaly.

 

[cali8484]

That small difference is unlikely cause any serious safety issue. It's due to small tolerance and display rounding. You can measure the actual current and it will likely be just above 0.5A over the nominal limit.

 

[ATPMSD]

Would this happen to be an SR+? Max charging rate for them is 32A.

 

[SigNC]

Would this happen to be an SR+? Max charging rate for them is 32A.

No, just the 32 amp limit of the mobile EVSE. The anomaly is it’s “overcharging.”

 

[SigNC]

That small difference is unlikely cause any serious safety issue. It's due to small tolerance and display rounding. You can measure the actual current and it will likely be just above 0.5A over the nominal limit.

Yeah, the way is bounces between 33 and 32 makes me think the same.