TT—30P (120v) to 14-50P (240v) adapter?

[ajdelange]

Please report back if the Rivian accepts 24amp pilot on L1 charging.

It does not. For L1 with the 5-15P adapter it is limited to 12A (1440W). Were they to make a 5-20P adapter that would limit to 16A (1920W). But the adapter in question has the TT-30 plug on one side and a 14-50R receptacle on the other into which you plug the Rivian 14-50 dongle thus programming the EVSE for 32 A. The 30A breaker at the camp ground will handle this for some time but will eventually trip and it is not kosher to operate in this way, You must reduce the charging draw to 24A,

You will need to also buy a EVSE (the Rivian one won't do > 12 amp @ 120v).

That may or may not be the case AFAIK. The similar (UMC) product from Tesla will and I would expect the rivian product to do so as well but I cannot state that it does.

Sponsored

 

[ajdelange]

So my question - do we think it’s safe to try and/or can I screw anything up on the truck by trying it?

The function of the EVSE is to connect the charger in the truck to the mains supply only when the mains supply is suitable so I think you are safe.

 

[ajdelange]

1772 spec limits 120v charging to 16A. I would be surprised if the Rivian would accept more than that.

I wouldn't. You certainly want the Rivian to be able to charge from any charger that meets J1772 but there is no reason to want to limit it to what J1772 allows. I am guessing that the charger in the truck is capable of 48A at any AC voltage from around 100V up to 250V (rms) and thus operating from these campground circuits but it's speculation on my part and we won't know until someone tries it or Rivian gives guidance.

 

[Lsthrz]

I’ve been charging my truck for a while without issue using a 30a to 14-50 adapter and the R1T’s cable. Not ideal in terms of kW, works fine.

 

[ajdelange]

If the 30A circuit is 120V (such as in an RV park) then this is relevant. If it is a 240V 30A circuit (e.g. clothes dryer plug) then it is not. In either case don't forget to set charge rate to 24A or less.

 

[Dark-Fx]

I’ve been charging my truck for a while without issue using a 30a to 14-50 adapter and the R1T’s cable. Not ideal in terms of kW, works fine.

Yeah, but is your 30A outlet the split phase 240V type? or a TT-30, which is only 120V.

 

[Dark-Fx]

My understanding is the adapter in OP’s original post “tricks” the vehicle into thinking it is receiving low voltage charging through the 14-50 evse. As @ajdelange mentioned I think the question is whether the truck will accept it or not.
So my question - do we think it’s safe to try and/or can I screw anything up on the truck by trying it?

I would be surprised if it would mess anything up in the truck. Worst case, either the evse refuses to activate or the truck refuses to charge.

 

[Lsthrz]

Yeah, but is your 30A outlet the split phase 240V type? or a TT-30, which is only 120V.

240v

 

[ajdelange]

Then not relevant

 

[Aardvark]

https://www.evseadapters.com/products/tt-30p-to-nema-14-50r-ev-adapter/

Ok.. so fundamentally I understand you can’t get 240v out of a 120v plug. I get that. So what exactly happens if you plug the Rivian 14-50P plug into this adapter Dr a campground with a 30A TT-30P plug?

We just came back from a camping trip and found we could only charge at 1.5Mi/Hr on the 20A 120V outlet. There was a lovely TT-30A outlet just teasing us.

could this adapter let us at least charge at around 3Mi/Hr?

I've been using a 14-50R to TT-30 homemade adapter in my Tesla X at campgrounds for the past 5 years. I have to manually set the max charging current to 24 Amps otherwise the car tries to pull 40 amps.
I usually start at 18 to 20A then slowly increase to 24 as many state and national park sockets are old and corroded. Many times the sockets can't handle the full 24A.
Does the R1T have the ability to manually limit the charge current?

 

[Kunzene]

I've been using a 14-50R to TT-30 homemade adapter in my Tesla X at campgrounds for the past 5 years. I have to manually set the max charging current to 24 Amps otherwise the car tries to pull 40 amps.
I usually start at 18 to 20A then slowly increase to 24 as many state and national park sockets are old and corroded. Many times the sockets can't handle the full 24A.
Does the R1T have the ability to manually limit the charge current?

Thank you for the advice. Yes the R1T has the ability to manually adjust charge current.
I’ll be trying it out this weekend and will report back.

 

[pc500]

Many Rv pedestals are back to back. Where you have 2 30amp plugs (one on each side). I have also used a pedestal with a 30 and a 20 (another adapter) on the same pedestal or a 30a extention cord to another pedistal. Basically, you are getting L1 voltage from one plug and L2 from another. Since my coach splits this onto 2 legs of 120v, I'm not worried about being unbalanced in amperage. Your charger will utilize 220v and to be safe, you should set the charge amperage to 20% less than the smallest amperage. So, if you have one leg of the adapter plugged into a 20 amp (non gfci) circuit, you can charge at 15a @ 220v (twice the charging speed of just plugging into the 110v). Any questions, consult an electrician.
P=IE

Usually that "back to back" pedestal is for your neighbor's RV site, and you aren't paying for it.

You can pull the 20 amp, but sometimes RV parks prohibit this too as they don't size the 30a + 20a for simultaneous draw. They yell at people plugging in space heaters, etc. That puts you at 15 amp, but is an improvement!

Best just finding a 50 amp site, unfortunately. The sub-50 amp charging was a high efficiency EV/Leaf/Tesla game.

 

[Kunzene]

Usually that "back to back" pedestal is for your neighbor's RV


Best just finding a 50 amp site, unfortunately. The sub-50 amp charging was a high efficiency EV/Leaf/Tesla game.

I've been using a 14-50R to TT-30 homemade adapter in my Tesla X at campgrounds for the past 5 years. I have to manually set the max charging current to 24 Amps otherwise the car tries to pull 40 amps.
I usually start at 18 to 20A then slowly increase to 24 as many state and national park sockets are old and corroded. Many times the sockets can't handle the full 24A.
Does the R1T have the ability to manually limit the charge current?

So far so good….

 

[pc500]

It is doing a 120v pilot @ 24 amp (I assume limited by the car's ability to limit amperage)? That is awesome to hear.

Factory EVSE or did you have to buy one?

 

[godfodder0901]

It is doing a 120v pilot @ 24 amp (I assume limited by the car's ability to limit amperage)? That is awesome to hear.

Factory EVSE or did you have to buy one?

The photo shows the included factory mobile charger.

Sponsored