Power Share wasted charging another EV?

[akenis]

Off grid situation with no solar and whole house backup. Truck and another EV are plugged in to different wall chargers.

When the Truck starts PowerShare to backup the house, what prevents that power from going straight into the other EV? Kind of self defeating. Would this overload and trip the Truck. Would the other WC derate at least?

Would anything be different without the truck and just a PowerWall?

Trying to figure out how to fix this. Span panel would obviously be great, but expensive. Can a Neurio meter be used to start Dynamic load shedding?

https://www.tesla.com/support/charg...nt adjusts charge,panel is within safe limits.



New Eaton breakers:

https://theevreport.com/eaton-and-tesla-team-up-for-home-energy-storage-innovation

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[Crissa]

Well, the Tesla chargers don't charge from an off-grid source unless you tell them to.

And many wouldn't wire their house so that the PowerShare would support the other charger.

How you'd wire in other breaker devices I couldn't say. There's almost infinite configurations.

-Crissa

 

[SentinelOne]

not installed yet but my 2nd charger will be on main panel and not on the backed up panel

 

[akenis]

not installed yet but my 2nd charger will be on main panel and not on the backed up panel

I'm trying to avoid costs associated with additional wiring for separating critical loads and not backed up loads.

 

[cyberos]

Off grid situation with no solar and whole house backup. Truck and another EV are plugged in to different wall chargers.

When the Truck starts PowerShare to backup the house, what prevents that power from going straight into the other EV? Kind of self defeating. Would this overload and trip the Truck. Would the other WC derate at least?

Would anything be different without the truck and just a PowerWall?

Trying to figure out how to fix this. Span panel would obviously be great, but expensive. Can a Neurio meter be used to start Dynamic load shedding?

https://www.tesla.com/support/charging/wall-connector/power-management#:~:text=Dynamic Power Management adjusts charge,panel is within safe limits.



New Eaton breakers:

https://theevreport.com/eaton-and-tesla-team-up-for-home-energy-storage-innovation

Had this exact same off grid discussion with my electrician (I have a gas generator that powers the whole house)

You have to turn off the 32 A (or 48 A) breaker for the other EV. It should have it's own breaker, separate from other circuits in your garage

 

[akenis]

Well, the Tesla chargers don't charge from an off-grid source unless you tell them to.

And many wouldn't wire their house so that the PowerShare would support the other charger.

How you'd wire in other breaker devices I couldn't say. There's almost infinite configurations.

-Crissa

Thanks,

I set up the Gen 3 charger over a year ago. How does it know what the source of power is and when it should stop? It's just connected to the main panel.

I'm skipping the 3V gateway and doing a PowerWall for my PowerShare. At least one WC has to be on backed up loads.

Trying to avoid costs of wiring separate backed up and not backed up panels. I want to load shed either manually or via some sort of automation.

With just a PW 3 I'm down to 11.5 kw avail. Plug in the truck and I get another 11.5 kw (supposedly). That give me 100 Amps to work with.

Cyber truck has a low battery setting to say stop providing backup power when battery is less than xxxx %.

Similarly I think PW has a setting to not provide power to WC if below a certain %. Are you saying just set that to 100% to inhibit PW supplying WC?

 

[akenis]

Had this exact same off grid discussion with my electrician (I have a gas generator that powers the whole house)

You have to turn off the 32 A (or 48 A) breaker for the other EV. It should have it's own breaker, separate from other circuits in your garage

https://www.tesla.com/support/energy/powerwall/mobile-app/vehicle-charging-during-power-outage

 

[Crissa]

I set up the Gen 3 charger over a year ago. How does it know what the source of power is and when it should stop? It's just connected to the main panel.

The gateway and charging point (the charger is in the car) communicate via wifi.

-Crissa

 

[HaulingAss]

not installed yet but my 2nd charger will be on main panel and not on the backed up panel

Yes, the obvious way to set it up. But, even if you don't, if there are two EVs plugged in when the power is out, someone should be home to go unplug the other EV when the power goes out. But I would never put an EV charging circuit on a panel backed up by a Home Powershare System.

I don't see this as a real issue.

 

[Pops]

I am literally getting my power share installed right now, I spent most of the day Monday and Tuesday helping the electrician do it, they finish on Friday.

Others might have a different configuration, but mine is pretty typical.

Grid > Powershare > 1 Panel > House

If the power goes out my CT will charge my 2nd EV... for a short time at least. The 2nd EV will be pulling 7kw of the 11kw output of power share. If there are any loads, including my AC it will trip its breaker immediately.

This would make the power outage and issue immediately obvious to myself or anyone else in the house. Then we can go unplug the 2nd EV and go on about our business.

As others here have mentioned, there are some alternatives to avoid this issue automatically, but that would be at considerable cost. I dont mind taking the extra effort once of twice a year that there is an outage if the 2nd EV happens to be charging.

 

[SentinelOne]

I'm trying to avoid costs associated with additional wiring for separating critical loads and not backed up loads.

understood, me too.....my house has the from street panel outside where the house 200amp breaker is and the 2nd circuit for the 2nd charger is and the also the existing house panel where all the individual breakers are - the 2nd house panel is what PowerShare backs up - eg whole home, no modifications what so ever...they're not running a new sub panel.. my quote is <$4k...not sure if I explained that right but bottom line is no new sub panel and 2nd charger not backed up

 

[TeslaKen]

I may be over simplifying but why not have your app alert you to the start of charging for the other EV and simply shut off its charging using the app until power is restored?

 

[CyberT1]

Off grid situation with no solar and whole house backup. Truck and another EV are plugged in to different wall chargers.

When the Truck starts PowerShare to backup the house, what prevents that power from going straight into the other EV? Kind of self defeating. Would this overload and trip the Truck. Would the other WC derate at least?

Would anything be different without the truck and just a PowerWall?

Trying to figure out how to fix this. Span panel would obviously be great, but expensive. Can a Neurio meter be used to start Dynamic load shedding?

https://www.tesla.com/support/charging/wall-connector/power-management#:~:text=Dynamic Power Management adjusts charge,panel is within safe limits.



New Eaton breakers:

https://theevreport.com/eaton-and-tesla-team-up-for-home-energy-storage-innovation

Do You mean someone out there can actually use Power Share? I have been waiting for 5 months and still no power share.

 

[Korben Dallas]

Has Tesla started pushing the PowerShare update yet & if they have, how do I access it? This is important to me because I already have all the hardware (Gateway, PowerWalls, & Universal Wall Connector) in place to power our home from my CT.

 

[DarickHemphill]

In a real electrical emergency. I believe I would unplug the other EV.

Darick

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