Pro Power Ground Fault

[FLSpartan04]

Likewise, @flyct! Always a pleasure to meet others as enthusiastic about their truck as I am! Now I am semi looking forward to my first real chance to use it (minus the storm that will likely necessitate its use).

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[Hammick]

Following up on this older thread. We power our house daily with our Lightning when in town. It will throw a ground fault if the charger is attached to the truck. Has anyone been successful using Pro Power to power their house while the charger is attached? I'd really like to be able to leave the charger attached. That way when I forget to turn the truck off for the night at least it will still charge during the cheap midnight to six AM rates.

 

[Maquis]

Following up on this older thread. We power our house daily with our Lightning when in town. It will throw a ground fault if the charger is attached to the truck. Has anyone been successful using Pro Power to power their house while the charger is attached? I'd really like to be able to leave the charger attached. That way when I forget to turn the truck off for the night at least it will still charge during the cheap midnight to six AM rates.

Did you have to unhook the ground conductor in order to get PP to work (without the charger connected)? If so, the ground that you disconnected is now connected again when you plug in the charger.
If this describes your scenario, there isn’t an easy fix, because the charger will fault without a ground connection.

 

[EVpower]

There is a ground connection on the charging cable, so the truck is grounded when connected for charging. Is it practical to move the feed to the charger upstream from the utility disconnect?

Steve

 

[Hammick]

Did you have to unhook the ground conductor in order to get PP to work (without the charger connected)? If so, the ground that you disconnected is now connected again when you plug in the charger.
If this describes your scenario, there isn’t an easy fix, because the charger will fault without a ground connection.

Thanks Maquis the makes sense. Yes I eliminated the ground from the PP to my automatic transfer switch. I don't think my transfer switch isolates the neutral even though I thought it did when I first bought it.

For now unplugging the charger isn't end of the world as we have to go to the truck every night and every morning to turn it off and on. If they ever push the OTA to be able to use the PP with the truck off I'll probably look for a different Transfer switch.

 

[Hammick]

There is a ground connection on the charging cable, so the truck is grounded when connected for charging. Is it practical to move the feed to the charger upstream from the utility disconnect?

Steve

Not sure I'm following. The 60 amp breaker for our charger is located in our main panel. Our sub panel is connected to the automatic transfer switch and runs off PP or mains power.

 

[EVpower]

Got it. The grounds are still connected between the EVSE and earth ground through the sub panel.

Does your ATS have auxiliary contacts which close when PPOB is the selected? If so, the ATS could control a contactor to cut off power to the truck charger when the Lightning is the power source.

Steve

 

[Maquis]

Got it. The grounds are still connected between the EVSE and earth ground through the sub panel.

Does your ATS have auxiliary contacts which close when PPOB is the selected? If so, the ATS could control a contactor to cut off power to the truck charger when the Lightning is the power source.

Steve

Connection to earth is irrelevant. It’s the neutral to ground bond that causes the issue.

Cutting off power won’t disconnect the EGC (equipment grounding conductor) nor should it.

 

[Hammick]

Got it. The grounds are still connected between the EVSE and earth ground through the sub panel.

Does your ATS have auxiliary contacts which close when PPOB is the selected? If so, the ATS could control a contactor to cut off power to the truck charger when the Lightning is the power source.

Steve

Yes it is a 50a ATS specifically for RVs. Thanks for any advice on how I can remote power my 48a Autel charger from these contacts.

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