Powering an RV travel trailer with the Cybertruck -- Test Results

[Dids]

Anyone have any idea why rv ac / microwave won't come on when powering rv with 110 /15amp plug adapter from cybertruck, will if plugged into shore power 110/15amp adapter to the 30amp expected. Today was just a test , yes I ordered a tt-30amp to 14-50 adapter. So no need to tell me plugging 30 amp load into 20 amp circuit is bad. Truck shows pulling 600w which is 5 amp at 110. But ac no turn on!
Once again ac works with shore power plugged into 110 15 amp circuit.

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[rlhamil]

Anyone have any idea why rv ac / microwave won't come on when powering rv with 110 /15amp plug adapter from cybertruck, will if plugged into shore power 110/15amp adapter to the 30amp expected. Today was just a test , yes I ordered a tt-30amp to 14-50 adapter. So no need to tell me plugging 30 amp load into 20 amp circuit is bad. Truck shows pulling 600w which is 5 amp at 110. But ac no turn on!
Once again ac works with shore power plugged into 110 15 amp circuit.

One possibility (guess): even if the total load isn't over the limit, the surge load when an ac or microwave turns on is considerable (even in a house, you can see lights dim for less than a second, which you wouldn't notice turning on a table fan or most electronics), and may be. If the truck's protection is sufficient to not allow those brief peak loads, they won't turn on successfully. Your usual circuit breaker is made to be a bit tolerant for a brief time; all it has to protect against is wires from burning. The Cybertruck has a more complicated power distribution system to protect, so it may be more aggressive about protecting it.

The 240V socket has the wattage, but the wrong voltage. But a transformer would be heavy, expensive, and suck some power itself. In particular, if the output is under near full load, a transformer can be efficient. But at low or zero output load, it STILL eats some minimum of power. Think the "vampire draw" from USB chargers that people complain about. That can be much reduced if they can detect output load and if it's basically zero, shut down, except for a tiny amount of power needed to automatically turn on again. But that gets fancier/more expensive. A very quick bit of searching does not reveal a small, cheap transformer with near zero no-load draw that would be suitable. Maybe you'd have better luck finding one. I wouldn't risk damage or just spending for something that might not work as I desired.

 

[Dids]

14-50

One possibility (guess): even if the total load isn't over the limit, the surge load when an ac or microwave turns on is considerable (even in a house, you can see lights dim for less than a second, which you wouldn't notice turning on a table fan or most electronics), and may be. If the truck's protection is sufficient to not allow those brief peak loads, they won't turn on successfully. Your usual circuit breaker is made to be a bit tolerant for a brief time; all it has to protect against is wires from burning. The Cybertruck has a more complicated power distribution system to protect, so it may be more aggressive about protecting it.

The 240V socket has the wattage, but the wrong voltage. But a transformer would be heavy, expensive, and suck some power itself. In particular, if the output is under near full load, a transformer can be efficient. But at low or zero output load, it STILL eats some minimum of power. Think the "vampire draw" from USB chargers that people complain about. That can be much reduced if they can detect output load and if it's basically zero, shut down, except for a tiny amount of power needed to automatically turn on again. But that gets fancier/more expensive. A very quick bit of searching does not reveal a small, cheap transformer with near zero no-load draw that would be suitable. Maybe you'd have better luck finding one. I wouldn't risk damage or just spending for something that might not work as I desired.

Nema 14-50 is 125/250 volt spec. No transformer needed to get 1 hot wire. Just a properly wired adapter.
It is not cybertruck preventing AC from turning on the RV is not supplying power to AC when plugged into 110 outlets but will if plugged into shore.

 

[rlhamil]

14-50

Nema 14-50 is 125/250 volt spec. No transformer needed to get 1 hot wire. Just a properly wired adapter.
It is not cybertruck preventing AC from turning on the RV is not supplying power to AC when plugged into 110 outlets but will if plugged into shore.

Clearly there's something different in what CT does vs grid. Maybe it's something on both CT and RV that just happens not to play nicely.

Is there a support contact or forum for the RV?

 

[Giskard]

Yes, I’ve tested it and it still does not work. Hoping for that fix soon

I would like to see this, too, but I suspect this is a restriction on the hardware. I assume they're using the same inverter to enable AC charging and powering the AC outlets off of the battery. Which means it's likely only one of those can be active at once. That would make sense as it would save cost/weight/complexity not doubling up on inverters. And if you have AC power (say, at a campsite) you could split it at the source though I agree that isn't as convenient (nor does it help you at a public AC EVSE). Hopefully Munro Live or Caresoft will let us know for sure as they work through their teardowns.

One of the reasons I'm interested in the Cyberlandr is it sounds like they may be tapping into one of the DC circuits, so it wouldn't be reliant on the AC circuit being live.

Tesla did enable powering the AC outlets whilst DC charging, though, which could be helpful while towing an RV to your destination.

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