Wiring for Tesla Charger, Powershare

[mongo]

They keep moving the goal post. But that's What Tesla does

Just passing along the official guidance.

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[mongo]

If the cable is NM-B 4 AWG + 8 AWG ground, from a current perspective you're ok.

But I suspect the electrician wants to update wiring to individual THNN 4 AWG conductors (2 hots) plus a 6 or 8 AWG ground and put all of it in conduit (schedule 40) as required for THHN cables.

Existing cable likely has 2 hots, 1 neutral (not used by Tesla wall connector), and a ground.

Personally I am uncomfortable with that much current flowing in wires not in a conduit.

???
NM-B is fine from every perspective when properly mounted inside. What is the reason for your lack of comfort with the NEC standards? And what does circuit ampacity gave to do with it?

 

[pricedm]

???
NM-B is fine from every perspective when properly mounted inside. What is the reason for your lack of comfort with the NEC standards? And what does circuit ampacity gave to do with it?

I am uncomfortable with wires for wall connector not in a conduit.

 

[BrockN]

I am uncomfortable with wires for wall connector not in a conduit.

Why?

 

[EWELON]

They keep moving the goal post. But that's What Tesla does

There are definitely YouTube vids out there (out of spec for instance) of people who have PowerShare without Powerwall installed and working. After install they, turnoff the main breaker and the CT kicks in nearly instantaneously.

 

[EWELON]

I am uncomfortable with wires for wall connector not in a conduit.

Yeah the wiring is definitely in a hard conduit when it exits the exterior wall, but within the 20ish foot run from the wall to the breaker it’s running just like every other wire in the basement. Been running that way fine for the past 5ish years.

Seems like the electrician who gave me the new PowerShare quote is trying to get (more than) a few extra bucks from me by saying a whole new big ass wire needs to run from the PowerShare gateway to the location of the new wall connector.

I’m just replacing my existing one, not adding a second one….since they also told me that they can’t just add the new connector with a short run of new cable from the old connector.

 

[mongo]

I’m just replacing my existing one, not adding a second one….since they also told me that they can’t just add the new connector with a short run of new cable from the old connector.

Yes, they can (local code rules excepted). Remove WC, replace with junction box, splice, run wire to new location.
What they can't do is daisy chain.

 

[EWELON]

Yes, they can (local code rules excepted). Remove WC, replace with junction box, splice, run wire to new location.
What they can't do is daisy chain.

No daisy chain is what I mean I guess. If I wanted two chargers then I would need two “home runs” back to the circuit breaker, correct?

But if I just want one charger they can just uninstall old wall connector and replace it with new WC in the same location, correct?

Reallly appreciate everyone’s help and input.

 

[mongo]

No daisy chain is what I mean I guess. If I wanted two chargers then I would need two “home runs” back to the circuit breaker, correct?

But if I just want one charger they can just uninstall old wall connector and replace it with new WC in the same location, correct?

Reallly appreciate everyone’s help and input.

If you had two Gen 3 wall connectors and no Powershare, you could share a branch circuit using Group Power Management. Not sure if Powershare and Group Power Management can co-exist.

For your setup, swapping the old for the UWC makes sense.

 

[OldDirtyRobot]

Has anyone been able to use power share to power your home I am still waiting for firmware now have my truck over a year

That is insane. Mine was activated 48 hours after install. In Texas.

 

[mongo]

That is insane. Mine was activated 48 hours after install. In Texas.

You don't have Powerwalls though.

 

[drsaab]

They do need to run a new control wire for powershare to the Universal charger.

Also powershare is working with tesla solar but not sure about with powerwall.

 

[CyberGus]

Not sure if Powershare and Group Power Management can co-exist.

I specifically asked this of my installer, and they said that Powershare must be on its own branch circuit.

 

[mongo]

I specifically asked this of my installer, and they said that Powershare must be on its own branch circuit.

What about group power management on separate branch circuits?

 

[Jhodgesatmb]

Hey all. This is my first post. About to place my order for my CT. Doing due diligence on the PowerShare. Got connected with an electrician via the Tesla website. I already have a Model 3 that we charge without difficulty using an older generation Wall Connector. I get that I’ll need to upgrade that to a Universal Wall Connector….but the electrician is saying that they’ll need to also run a new wire from the circuit breaker to the wall connnector. Which is basically the most expensive component of the whole install. Just checking to see if anyone has had a similar recommendation. They’re saying that: “this wiring would have to be replaced. The Cybertruck has a larger battery than other Tesla models, which necessitates a higher amperage circuit. To accommodate the higher amperage, it requires a larger gauge wire to be able to accommodate the increase in power flow. Without upgrading these components you will not be able to properly charge the battery for the vehicle….”

a picture of the wire in question is attached.
Thanks for the advice. Excited to finally get this vehicle!

The control wire is required because the Gateway needs to talk with the WC directly. On mine they had to pull the wires out (in conduit under my driveway because the WC is on the other side) and then run them back with the control wire.

all (modern) Teslas max out at 48 amps on a 240v circuit and a 60-amp breaker. If your wire is suited right for a 240v/60-a service you are fine. The control wire is separate.

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