Can't charge other Tesla from Cybertruck power outlet

[QuantumGlen]

I'm looking for some help from someone who has been successful using their 220V outlet in the CT bed to power the mobile charger to charge another Tesla.

When I set this up, the mobile charger indicates it has power (1 green steady light), but when I plug in the charger to another Tesla (Model 3), the charger clicks after 1-2 seconds and power is lost. I can reset everything, but I get the same result. It seems like the internal GFCI for the mobile charger is tripping. I have tried different variations to see if I can localize the problem on a piece of gear, but no luck. tired using different mobile chargers (but they are Gen1--don't know if that makes a difference),

• tired using different mobile chargers (but they are Gen1--don't know if that makes a difference)
• tried charging a different Tesla,
• tried dialing down the amps from 32 to 10,
• confirmed that mobile connector works with wall 14-50 outlet,
• tried hooking things up in a different order,
• tried all combinations of resets

...all with same results.

The one thing I haven't tried is to power something else other than a Tesla charger with the 14-50 outlet. I have no other device that fits that. I believe it is providing power based on the CT screen and the green light on the charger when plugged in (before trying to pull current through it.)

I suspect either I am missing some configuration setting or that my Gen3 mobile is somehow defective.

I set up a service call, but I'd still like to figure this out, if I can. Any ideas?
Thanks!

I used the mobile cable that came with the truck, put on the right 14-50 plug, put it into the 220v outlet in the truck, and charged my wife's Model Y at 11kw. No problems.

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[Jones 1]

Sorry if you already know this (but it took me a bit to figure out)...
You have to turn on the outlet on the touch screen then choose the option to keep the outlet powered on for 12 hours (separate toggle). If you don't do this, the outlet will just power off when the vehicle locks.

Thanks.
I had showed someone the outlets. I had a lamp plugged in to the 120v. I had put the tailgate up and had my phone in my pocket. But it is set to turn off after vehicle is locked. It will trip the breaker. I tried it again later. With the truck on unlock and it would work. I didn’t realize what was going on. I didn’t have to reset the breaker. When the vehicle stays unlocked.

 

[HornedHelmet]

Update on my latest troubleshooting and testing:

1. Performed reset of Cybertruck as suggested.​

2. I was able to transfer charge at 120V 12A without interruption. This only got me about 4 miles of range in my Model 3 in an hour's worth of charging. Not a practical solution.​

3. I was able to transfer charge at 240V at 8A (and less) and it would work for a few minutes before tripping. I will have to try this again with lower amperages. Any attempt to go higher than 8A would cause an interruption after 1-2 seconds.​

Next steps:

1. Try to transfer charge at 240V at lower amps (Still not very practical. Should be able to get closer to the mobile charger's limit of 32A)​

2. Try to find a friend with a Gen3 charger and test.​

I'm pleased that I had some success demonstrating that my 240V NEMA 14-50 outlet does provide power--even if it is just a little bit. I'm hoping that my Gen3 charger is the problem. Having a successful test with a different Gen3 might help me prove that.

Need to get around 30 miles/hour of charge for "EV rescue" to be a viable function. I can't spend a whole day trickling range at 4mph to a depleted EV.

More updates to come as I get them. Thank you again for all the suggestions.

 

[mongo]

I'm pleased that I had some success demonstrating that my 240V NEMA 14-50 outlet does provide power--even if it is just a little bit. I'm hoping that my Gen3 charger is the problem. Having a successful test with a different Gen3 might help me prove that.

Point of clarification: the mobile connector is basically a fancy GFCI breaker. The charger is part of the vehicle being charged.
If the Cybertruck is tripping out, it may be a truck issue.

 

[Macgreiner]

 

[HornedHelmet]

SOLUTION!!!

I was talking to my local Tesla Service Center technician (and friend), and he gave me something to try that worked. It is a known issue that *some* of the NEMA 14-50 adapters for the mobile chargers that come as part of the FS package are defective, and can cause the symptoms I am seeing. His recommendation to me was to swap 14-50 adapters from a different mobile charger and try again. I had another mobile charger handy, so this was easy for me to try.

I did this, and it worked perfectly. I achieved 32A charging at 240V for about 7.4kW. Success. Tesla will replace my defective NEMA 14-50 adapter under warranty.

Thanks to y'all who gave me various configurations and steps to try. This is a great community and very helpful and supportive. Cheers!

 

[HornedHelmet]

SOLUTION!!!

I was talking to my local Tesla Service Center technician (and friend), and he gave me something to try that worked. It is a known issue that *some* of the NEMA 14-50 adapters for the mobile chargers that come as part of the FS package are defective, and can cause the symptoms I am seeing. His recommendation to me was to swap 14-50 adapters from a different mobile charger and try again. I had another mobile charger handy, so this was easy for me to try.

I did this, and it worked perfectly. I achieved 32A charging at 240V for about 7.4kW. Success. Tesla will replace my defective NEMA 14-50 adapter under warranty.

Thanks to y'all who gave me various configurations and steps to try. This is a great community and very helpful and supportive. Cheers!

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