Power Share wasted charging another EV?

[Pops]

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

Darick

Worst case scenario...

1. You go to sleep at 11:00 p.m.
2. Power goes out at 11:05 p.m.
3. CT charges your model Y to full by 6:00 a.m.
4. You wake up to a drained CT and no power. At 7:00 a.m.

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[TyPope]

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.

If they are both Tesla HPWCs, they can talk and the 2nd EV will not be able to charge when the grid goes down. At least, it's my understanding that the two HPWCs can be made to interact to that level. I KNOW they load share without even having the Power Share part.

 

[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

So, I just got off us who have of us with Tesla Solar Panels, Power Walls and the wall Connector will NOT be able to use Power Share it will not be available until the end of the year and might be pushed into some time next year.

 

[akenis]

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

Only problem with that set up is that your site metering will be off. I assume you are using the PowerShare gateway. Since the second charger is upstream if the gateway, your energy usage will be off.

Gateway 2 has inputs for external meter to account for non backed up loads. Gateway 3 also has remote meter option now. Not sure about PowerShare gateway.

 

[akenis]

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.

Still says coming soon. Just like FSD and hubcaps!

 

[DarickHemphill]

Worst case scenario...

1. You go to sleep at 11:00 p.m.
2. Power goes out at 11:05 p.m.
3. CT charges your model Y to full by 6:00 a.m.
4. You wake up to a drained CT and no power. At 7:00 a.m.

Good point.

I have a 14 year old knocking on my door at 1106 telling me she cant sleep cause the fan in her room is off.

 

[Guylouis]

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

-Crissa

They actually communicate via an RS communication Wire

 

[Crissa]

They actually communicate via an RS communication Wire

Oh, I didn't know that!

-Crissa

 

[SentinelOne]

Only problem with that set up is that your site metering will be off. I assume you are using the PowerShare gateway. Since the second charger is upstream if the gateway, your energy usage will be off.

Gateway 2 has inputs for external meter to account for non backed up loads. Gateway 3 also has remote meter option now. Not sure about PowerShare gateway.

yes, using the "free/included" PowerShare gateway...

Will it? when street power goes off that charger/circuit will be off and the CT/PS will be the only source feeding the house and I think accurate? If your talking during not outage that I wont see true usage because PS wont see the second circuit - should I really care?

 

[mstatkus]

You have 48A output managed at your breaker box. You are expected in an outage to reduce to your critical loads.
You trip the connection the gateway shuts off. Takes another minute or so to reset.

So choose your application wisely and don’t overload the system.

You can upgrade the panel to automate critical loads but doing this during install will extend the appeal process.

 

[cofree]

Oh, I didn't know that!

-Crissa

I have some vague memory that hpwc v2 communicates by wire, whereas hpwc v3 communicates wirelessly, and that the general setup method for v2 is to put them both on a large breaker, while for v3 you put them each on separate breakers. In that case this entire thread might be a mix of information about v2 versus v3 of the hpwc.

In our case we already have solar, and our utility allows the non-gateway method to connect a battery, and even gives a rebate for having a battery, so we're getting a powerwall installed for a net of $4k after all rebates etc... cheaper than a gateway and more effective.
We currently have the Cybertruck charging from an hpwc v2 while all our other EVs charge from L1 plug in EVSEs.

I'm not sure whether to try to get another hpwc v2, or replace with a couple of hpwc v3, or just continue our current method once we get the battery. I think our current HPWC is on an 80Amp circuit.
We don't seem to ever run low with our other EVs just charging at L1.
On this particular question, usually our other EVs drive 20-40 miles in a day, so I'm not too worried about losing 5-10kWh overnight from the cybertruck if there is an outage.

I'm hoping the typical powerwall+hpwc+solar setup will work once Tesla releases the backup from cybertruck using powerwall method.

 

[HaulingAss]

Worst case scenario...

1. You go to sleep at 11:00 p.m.
2. Power goes out at 11:05 p.m.
3. CT charges your model Y to full by 6:00 a.m.
4. You wake up to a drained CT and no power. At 7:00 a.m.

I believe the Cybertruck is designed to not drain its battery below 20% when in Powershare Mode.

 

[akenis]

You have 48A output managed at your breaker box. You are expected in an outage to reduce to your critical loads.
You trip the connection the gateway shuts off. Takes another minute or so to reset.

So choose your application wisely and don’t overload the system.

You can upgrade the panel to automate critical loads but doing this during install will extend the appeal process.

This! What I don't understand. I can do load management from my phone: turn off AC, turn of pool pump, turn off pool heater, Not use boat lift, Not run dryer...etc.

Can my system be approved based upon my manual load management to reduce load below the 11.5 kw available with PowerShare, or does AHJ require my total load to be below amperage available?

I don't want to rewire a separate critical loads panel. I want to manage it myself by simply not running the dishwasher, not heating the pool, etc.

 

[mstatkus]

I”ll be managing mine this way. Most my stuff is gas (dryer, hot water heater, stove). Well pump and EV charging the most demanding. The rest is network, laptops, lights.

They have you take pics of your panel and sub panels. Exterior meter and any AC unit(s) with there load ratings. Typically get assigned someone and they do a site walk. You’ll get options.
My garage is detached so 2 comm lines need to be added so the gateway and talk to the wall connector/truck.

 

[Gaximus]

They actually communicate via an RS communication Wire

My quote was just under $4k, but would have been much cheaper without this, they need to run new charging wires with the communication wire, and can't use my existing run to my WallCharger.

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