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Diagnostic Data Needed for Repeatedly Failing Tesla Powerwall 3 System

 
Energy Storage
Last Post by GrahamF 39 minutes ago
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GrahamF
 GrahamF
(@grahamf)
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Joined: 7 months ago
Posts: 98
Topic starter 30/11/2025 10:27 pm  

Last week, we installed 36 solar panels (16.9kWp) with 2 x Tesla Powerwall 3 (2 x 13.5kWh) and a Tesla Gateway.  They worked fine for a few days.  The solar panels were providing about 2kW.  The Powerwall batteries charged at 7p per kWh overnight and powered the house until they were exhausted.

However, after a few days, the system stopped working.  I have been making phone calls and sending e-mails to my installers.  They have raised the problems with Tesla, who have escalated to their senior engineering team.  The system has come back a few times, but then failed again.

It came as a surprise to me that the Tesla app provides no diagnostic information whatsoever.  My installer seems to be in the dark as well.  The kind of information I would like to see is:

  • The status of each Powerwall 3, rather than data aggregated across the two of them
  • Events with date and time stamps
  • How much solar power each MPPT is receiving
  • The status of the inverters

I have looked at the Netzero application which might help, but I need the SSID and password of the lead Powerwall 3.  Apparently, this information can be accessed via a QR code on each Powerwall 3.  However, this QR code is inside the Powerwall 3, where I cannot access it.

I have looked into Home Assistant, but it can access only the metering data.  It cannot access any diagnostics.

Does anybody have any suggestions on how to access diagnostic data?

Thanks,

Graham

 

 


This topic was modified 38 minutes ago by GrahamF

Grant Aerona 290 15.5kW, Grant Smart Controller, 2 x 200l cylinders, hot water plate heat exchanger, Single zone open loop system with TRVs for bedrooms & one sunny living room, Weather compensation with set back by room thermostat based load compensation


   
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