It IS possible to charge at 24A from a 120V TT-30 plug...

[TonyWilliams]

Yes, that's what Flasher described above. It has to be the correct hot you use or don't use though. The UMC/car is picky about which hot 120V comes in on.

Yes, it is. You need the correct polarity.

 

[Chris TX]

For example, I wired a 15-40 to 15-40 adapter to use 120V instead of 240V, and the car displays 20A/40A and refuses to go up from there.

Which terminal does the UMC 14-50 like to have hot? X or Y?

 

[Cosmacelf]

If you look at the face of a NEMA 14-50 receptacle with the ground on the bottom, the hot should be the left blade for a 120V feed. This is the opposite blade that a NEMA 5-15 receptacle would have.

 

[MN_Bob]

40 Amps at 112 Volts!

It seems that cars built fairly recently are capable of 40 amp charging on 120 volts. To test this, I temporarily wired my 6-50 outlet so one formerly hot side went to neutral instead of to the 50A breaker. I have the single charger, built March 2014, 85KWH. Don't try this unless you know what you are doing.

 

[TonyWilliams]

It seems that cars built fairly recently are capable of 40 amp charging on 120 volts. To test this, I temporarily wired my 6-50 outlet so one formerly hot side went to neutral instead of to the 50A breaker. I have the single charger, built March 2014, 85KWH. Don't try this unless you know what you are doing.

Awesome news that we will never see on the Toyota Rav4 EV.

20 amps is all we get on 120 volts.

 

[Cottonwood]

Awesome news that we will never see on the Toyota Rav4 EV.

20 amps is all we get on 120 volts.

This is the same 20 Amp, 120 Volt limit on early MS's. That limit is less of a concern for me than the 90 kW Supercharging limit. I can count the number of times that I used a TT-30 on the fingers of one hand; for those few times, the difference between 20 and 24 Amps is not an issue. Arriving at a Supercharger with a small SoC is a much more common event!

 

[Cosmacelf]

I wonder about that 90 kw limit. I supposedly have an "A" battery too, but this is what I got recently charging at a new 120 kW Supercharger recently - the numbers multiply to 100 kW...

 

[TEG]

 

[Cottonwood]

The problem is that those RV, 30-to-50-Amp "dogbones" won't work with a 14-50 UMC. The Tesla needs a different set of connections that won't work with the RV...

 

[bluetinc]

Would you mind verifying that you have an A battery? Did your main pack need to be switched out at some point?


(Mods, Both of our posts prob. belong somewhere else )

I wonder about that 90 kw limit. I supposedly have an "A" battery too, but this is what I got recently charging at a new 120 kW Supercharger recently - the numbers multiply to 100 kW...

 

[Cosmacelf]

Gawd - I thought I was losing my mind there for a while. I just checked my battery and it is a B battery, not an A. I was POSITIVE I had an A battery. So I hunted around, and found a photo I took about a year ago of the battery label. And sure enough it WAS an A battery. I went through all my Tesla service center paperwork (I have brought it in for a few things) and there is no mention of them swapping my battery, but obviously they did at some point.

So not only have I not lost my mind (yet), I have a newer battery. Yea! Good start to the day.

 

[TonyWilliams]

So not only have I not lost my mind (yet), I have a newer battery. Yea! Good start to the day.

Every time I walk into any service center, there is always at least two new batteries in wooden crates just waiting for a car like yours!!!

 

[AndreyATC]

It seems that cars built fairly recently are capable of 40 amp charging on 120 volts. To test this, I temporarily wired my 6-50 outlet so one formerly hot side went to neutral instead of to the 50A breaker. I have the single charger, built March 2014, 85KWH. Don't try this unless you know what you are doing.
View attachment 50655

I'm very jealous
Back, a few weeks ago i was asking members how to pull the most amps of 120v lines
I ended up using TT-30 RV plug, but it's limited to 20A
I'd love to have 40 instead

 

[trigga71]

This is interesting. Can anyone else confirm and post the VIN?

 

[Cosmacelf]

I'm very jealous
Back, a few weeks ago i was asking members how to pull the most amps of 120v lines
I ended up using TT-30 RV plug, but it's limited to 20A
I'd love to have 40 instead

The most you could have gotten with a TT-30 is 24A anyways - not that much more than 20A.

 

[trigga71]

It may not be 40 or 80 amp but its better and the quicker you can get enough miles to move from slow to faster, maybe to a public charger or better yet a supercharger the happier everyone involved will be.

 

[jweinstein]

Could the 20A vs. 24A 120V charge limit be related to having an A or B battery pack?

 

[Cosmacelf]

No. I have a B pack but a 20A limit.

 

[jweinstein]

No. I have a B pack but a 20A limit.

Interesting... What other hardware limitation could be at play in the older vehicles that's absent in the newer ones?

 

[Cosmacelf]

I suspect a firmware limitation rather than hardware. I know Tesla says that their updates also update firmware but maybe the charger isn't part of the automatic update system or tesla doesn't think the 20A limitation is a big enough deal to bother updating everyone.