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DIY Tesla Wall Connector with Load Management

This weekend I installed a Tesla Wall Connector and a Neurio W2 Power Meter and configured them for dynamic load management. Dynamic load management means that the EV charger will dial down the charge rate from 48A whenever the power meter detects that total load is close to the maximum load of the electrical service to the house. For houses like ours with 100A (or smaller) electrical connections that’s very convenient because we can charge our EV quickly without tripping the main breaker in the few brief instances where we’re both charging our car and running all the other electrical loads in the house.

You obviously should never do what I did and should always hire a licensed electrician and Tesla installer.

Parts

Installation

  1. Install the Neurio Power Meter. There’s a good how-to video on YouTube. It’s unclear to me if the WiFi connection is required when paired with a Tesla Wall Connector but I added the antenna for good measure. The main challenge for me at this stage was finding a spot in our already busy electrical panel and fiddling with cables for CT clamps and so on.
  2. Install the Wall Connector. Ours is installed right below our electrical panel with the power wire coming from behind.
  3. Connect power meter and wall connector. I chose to drill a separate hole in the wall connector back-plate for the power meter comms cable instead of trying to run it with the power wires, mostly because the comms cable isn’t very long and that way I didn’t have to mess with trying to extend it. The Wall Connector has an elegant design where the power wires all attach to the back plate and then the face plate just slots on. Unfortunately the comms-port is not part of that scheme and is on the face-plate assembly. So you have to connect the power meter comms wires while balancing the face-plate and then secure the whole thing to the back-plate.
  4. Initialize the Wall Connector. You can do this using the Tesla One app. The app is supposedly only for Tesla employees and 3rd party contractors but you can log in using a normal retail Tesla user account just fine. When you scan the QR code that’s on the Neurio power meter it starts showing up as part of the install and you can configure the CT clamps. Check if you need to “flip” them to ensure the meter registers power flowing in the right direction (“import” vs. “export”). At this stage you can also configure the max load where you want EV charging to start dialing down. Note that I didn’t configure the Neurio separately, it was all through the Tesla app.
Tesla Wall Connector back-plate with power and comms cables
Tesla One app screenshot, configuring when charging should be limited
Tesla One app screenshot, configuring the CT clamps on the Neurio W2. Note that the clamps are not yet “flipped”.

Summary

We took delivery of our Tesla a couple months ago and the power meter works great and we’ve had no main breaker trips for our 100A service.

We haven’t taken delivery of our Tesla car yet so I haven’t actually tested the dynamic load management. But I wanted to document this process since it does seem to work and the power meter registers with the Tesla app and site install and appears to be recognized. I’ll update this post when I’ve confirmed the setup works and throttles charging when we’re using all of our other appliances.

Comments

Harsh Singh on

Hi – thank you for putting this up. Was very useful as I was able to show to an electrician who configured the meter with the wall connector. Question for use the Neurio meter is flashing red and green. Is that how yours as is after the install. Thanks.

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Olyts on

Mine is flashing (alternate) Red and Blue, seems to work fine (once I flipped the CT’s). I tested the setup and yes the TWC is adjusting dynamically according to the max limit you have set.

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Fabrizio on

Hello, thank you for the guide.
I would like to ask you if there is the possibility of connecting via wifi only instead cable as already happens for the Backup Gateway.

Kind Regards

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Olyts on

Thanks for this write up! Quick question, on the WC rs485 connector, do connect the comm cable red with red and black to white?

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friism on

I think they changed the design for this, mine had a green double-connector that said +/-. I connected the red wire to positive, if I recall.

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Arash Ardeshirpoor on

Hello ,
Would
You please explain more about the part which you said we need to connect the power meter to the wall connector with a low voltage line. Where exactly we have to connect ?

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friism on

It depends on the model/generation of wall connector, but it should have a green or red/white terminal block for rs485. You can see someone hooking it up in this video.

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John on

I notice on eBay there are 3 different part numbers in listings for the Neurio W2 (1112484-04-A; 1112484-99-A; 1112484-06-A). What did you use, and are there any part numbers specifically not compatible with the Gen 3 wall connector? I’d rather pay $100 on eBay than $250 on Amazon. Thanks!

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Olyts on

Just finished installing my first Neurio. Went smoothly. I can confirm the red wire goes to the red terminal (for those who, like me, have a rs485 Red/White connector). After some unsucessful testing of the unit (I turned on many power hungry devices in my home to get the amp up!), the meter was displaying the right amount of amps, but the Wall connector was not adjusting, staying at 48 amps. I took a second look at the configuration, and once I selected « flip » on both ct in the wall connector config, all was good and the amp level was adjusting to keep everything at the max I provided. (80% of your max pannel load)

I don’t really understand the export/import thing (I guess this has more to do with powerwall), but the « flip » option did the trick for me. And before you asked, yes the clamps are on the right orientation in the Pannel.

Always test afterward, is the key here.

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friism on

Yeah I’m also positive I connected the clamps the “right” way but I also still had to flip the direction.

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Alex on

My electrician just finished the install but when I try to use the QR code on the neurio to finalize the setup nothing happens as if the code isn’t recognized. When I go to add it manually do you think I need to use the “powerwall” device type?

Thanks!

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Olyts on

There is not need to “add manually”, the device will be recognized by the Wallconnector, unless your wire are inverted.

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Tico on

Does anyone know if 3-phase is supported yet for Dynamic Load Management? I live in Australia where a third CT clamp would be required. I note the ‘official’ Tesla Neurio/Amazon.com shop only provides 2 CT clamps –

https://www.amazon.com/Dynamic-Power-Meter-Smart-Charging/dp/B0CP8F2H24?ref_=ast_sto_dp

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yannis on

hi, did you eventually manage to make a 3 phase connection? would you please care to tell us more if so ?
thank you

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Ignacio on

I just installed it in my house in Chile and worked perfect. The app (Tesla One) recognized it and I configured it in 2 minutes.
I have just charged it once and I don’t know how to upload a photo, but if you have any question you can write my any email and I will be happy to help you.
[email protected]

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Stefano on

Good afternoon Ignacio
My name is Stefano and I am writng from Italy
I am reading that you succesfully installed Neurio meter in a 3 phase connection
I am planning the same to support my Tesla Wall Connector
I would to know which Neurio meter did you use: Tesla site writes Tesla P/N 1112484-99-A and 1112484-06-A
I am finding both of them on Ebay but I don’t know if there are difference between them, especially for my scope. In particular if they are compatible with 3 phase connection
Thanking in advance
Best regards

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João Nunes on

In the Tesla One app did you see ant other compatible meter? Like Shelly?

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Prince Paulson on

Very useful post . I have installed wall connector with neurio . Electrician did a great job , initially didnt agree to install but I convinced and finally he managed to install neurio meter .

Now Any idea or have you tried connecting neuiro to home wifi to monitor usage using the generac PWRview app or via web ? If you try to connect neurio to home wifi will it stop communicating to tesla wall connector ?

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Olyts on

Hi, since the firmware is a reformulated one from Tesla, the Neurio does not work like the OEM one. The WiFi is only used for updates purposes. I think the monitoring aspect is possible via a Powerwall install, but this is a costly way just for monitoring needs.

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Charly B on

Confirmed with Generac:

////////////////////
Hello Charly,

Thank you for reaching out to Generac Power Systems. My name is Shacara, and it’s a pleasure working with you today. I have documented our conversation in case number 934xxxx.

Unfortunately, the Tesla devices are not supported through our Pwrview app. Please work with Tesla directly for assistance with setting up your device The phone number for Tesla is (888) 518-3752.

If you have any additional questions or concerns, please email, or call us at 888-436-3722 Thank you and have a great day!

Shacara W.
Customer Support Specialist
Generac Power Systems

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Charly B on

Hi Prince, I have the same question… I tried to add the neurio with PWRView first before connect to the Tesla Wall Charger, but can’t. I connect the neurio with the wifi, but cant see it with the app. Then I installed with the Tesla Wall Charger and works perfect with it, but still cant use it with the app PWRView. I did a lot of investigations and tried a lot of things, but nothing… works well with the charger, but I want to check the consuption in the house too…

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gerard on

hello
does the neurio meter only the consumption or PV export can also be used to charge the EV

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skoog on

As of 5/5/2024 the Tesla One app wasn’t working for me to complete the setup. After trying a bunch of things I figured out that you don’t actually need to configure the neurino device at all through an app or the device itself.

Once you have the device wired up. This youtube video has everything except the Tesla connector: https://www.youtube.com/watch?v=eNEtRIKiHFc . My lights blinked red/blue. Go back to the wall connector and enable the local Access Point by holding the button down on the NACS plug for five seconds. Once the AP is up, connect to it and go to http://192.168.92.1 and you should be able to configure the metering options and then once that is done the load limit.

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Chris on

Is it possible for anyone to provide a RS485 recording between the wall connector and the neurio? Perhaps we can then check how the communication work and repeat it with home assistant e.g.

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Josh Lee on

Very nice guide. I was able to guide my electrician throughout the process. They finished the wiring and basic installation and didn’t install the Comms cable. The one on eBay is not available any more. I got it from here: https://www.ebay.com/itm/166823974536?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=suaO6dcESVa&sssrc=2051273&ssuid=suaO6dcESVa&var=&widget_ver=artemis&media=COPY

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Neil on

Nice write up, thanks, If I already have several Neurios for an existing solar/powerwall installation, does anyone know if I can leverage the existing Neurio, but via a wired connection? and a spare Neurio W1 if needed….can I reuse?

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Joe on

Is it normal for the Neurio 1112484-99-A to be blinking red and blue?

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Al on

Successfully communication is indicated by green and red cycling. I too bought the -99 (kit?) but the Neurio had a -04 part number.

Connected the RS 485 with 75′ of shielded/#22 home security wire from Home Depot. The system works fine.

My problem is the minimum current limit I can set using the Tesla 1 app is 32. Yet, Friis’ screenshot above shows 6. By the way, thanks Michael for your info. I have solar panels and want to only charge the car with solar production … no dirty grid power!

Don’t know how to see Neurio’s firmware or how to change. Powerwall Installer app does not connect to my Neurio.

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Al on

Update: Tesla referred me to a installer troubleshooting number. The tech said “when you think you’ve heard of everything, there’s always a new one.” He could not explain the 32 vs 6 minimum discrepancy. Apparently, dynamic power management is only aimed at dynamically limiting max power pulled from the grid.

He confirmed that a Neurio serial number beginning with VAH has the latest firmware. He also said that any wall connector update would include any Neurio update and would occur over Wifi.

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Oliver Warner on

Great workup. Thanks
I bought a 1112484-99-A W2 (kit P/N?) from Ebay. The Neurio has a -04 P/N. Per
https://energylibrary.tesla.com/docs/Public/EnergyStorage/Powerwall/General/MeteringGuide/en-us/GUID-5166C0D9-72F5-43CE-914B-4C4A1ADD0BBD.html, a -06 P/N is specified (found this out after installation).

One of your screen shots above shows the limiting value range of 6 – 200A. Mine shows 32-200A. Can anyone tell me if this is a function of the P/N difference or what you see from the Tesla 1 app.

I have solar panels and want solar only charging and a 6A minimum would get me there. I called Tesla and the tech said the system apparently works only as a power limiter for undersized electric supply.

PS I ran 75′ of #22/shielded/untwisted Security wire from Home Depot. It works fine.

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Denis on

Hi,

I have a wall connector and a Powerwall. Knowing that the Powerwall is capable of 5 kW and I have a 3 kW subscription with the grid, if I buy the Neurio, I need to set it to 80% of grid capacity (2.4 kW), considering that the Powerwall can sometimes be empty. Will I be able to charge at higher rates than 2.4 kW when the Powerwall is full?

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