Tesla Powerwall 3 Integration Problems 2025

Configuration
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I have just had Tesla Powerwall 3 and Gateway 2 installed by Octopus in my UK home.

I’d like to integrate them with my Home Assistant installation and am struggling (using Tesla Powerwall - Home Assistant)

I see lots of messages here and on Reddit which seem to be in conflict - people saying the local API is deprecated, but others seem to be using it fine.

If I Add Integration, or Add Device, picking Tesla, Powerwall, I get prompted for IP address and password.

I’m pretty convinced I’ve got the IP address, 192.168.1.34 - although it doesn’t have a useful hostname or manufacturer in the list of devices on my router, nor is the mac address Tesla, doing nmap and looking at the details of the scan showed a certificate signed by Tesla from this ip address.

There are plenty of suggestions for the password:

  • your password to https://www.tesla.com/en_gb/teslaaccount
  • all of or the last 5 characters of the password found inside the Gateway
  • all of or the last 5 characters of serial number inside the Gateway
  • all of or the last 5 characters of the password found inside the Powerwall
  • you have to ask Tesla Customer Services
  • you have to ask Octopus Customer Services
  • it can’t be done any more

Yesterday, whatever I put in the password field (trying all of the first 3 suggestions above), I got “Communications Error” or something (sorry, I stupidly didn’t write it down)

Today, for everything except ‘last 5 chars of password inside the Powerwall’, I’m getting “Authentication failed with error: Access denied for resource https://192.168.1.34/api/login/Basic: bad credentials: Login Error”

But, using last 5 chars of Password inside the Powerwall, I’m getting “An unknown error occurred: Powerwall api error: The url https://192.168.1.34/api/site_info returned error 404”

Progress of sorts, I guess.

But I need advice and encouragement - am I wasting my time here? Does this still work? Or perhaps only on old Powerwalls? What am I missing?

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People might be confused between the local API and the local web interface - while the integration works locally (“Its IoT class is Local Polling.”) the web interface that was available when I had my Powerwall 2 installed about 2 years ago has gradually gone away.

For the networking interface you have to distinguish between the LAN and the WLAN interface - while my LAN MAC starts with 98:ed:5c (which is registered to Tesla, Inc.), for the WLAN, the MAC address prefix is 28:0F:EB, which is registered to LG Innotek.

Unfortunately, I don’t recall any more, which login worked for either of the two integrations I’m using:

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The only thing I remember is that it was a pain to get them set up, trying all the combinations you mention above as well.

And, one thing I can say for sure is that the LAN connection is 100% reliable while the WLAN was flaky - but that, of course, was also not 100% straightforward:
Availability Issues with Tesla API - Configuration - Home Assistant Community

Sorry that I can’t be of more help.

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That is indeed helpful. When you say LAN interface as opposed to WLAN interface, do you mean you have a CAT5/RJ45 cable plugged in? To the gateway or the powerwall? Where is the socket (I don’t see one)?

For everyone’s amusement, I add a picture of my powerwall after the front panel’s corner touched concrete from 2mm height…

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(I took it off to get the powerwall password)

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That front panel doesn’t even look that bad - definitely unique :wink:

Yup and here’s the inside look of the gateway - it’s not a photo of my gateway, though.
I know I have one but I borrowed it from here because it was easier to find:

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As you can see, there are definitely some live wires - so: be careful.

The linked website is generally very useful; I found a lot of stuff explained there that I didn’t find anywhere else, e.g. this.