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Brand support · Tesla Powerwall

Tesla Powerwall Support — Gateway Faults, Backup & Islanding

Powerwall 2 and Powerwall 3 batteries are installed across UK homes — gateway offline, backup reserve not engaging, self-consumption modes not working, islanding failures during power cuts. We diagnose Powerwall systems remotely from app data. Remote-first. Independent from Tesla and your installer.
Free remote diagnostic pay only if we fix it — from £95 if remediable remotely
  • Not affiliated with Tesla
  • Powerwall 2 and Powerwall 3
  • Gateway and app diagnostics
Not sure where to start?

Gateway offline, backup not working, app not updating — we diagnose Tesla systems remotely in a single session.

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Safety: do not attempt to repair the Powerwall unit itself. Gateway WiFi resets require installer credentials.

Ron was really helpful. He remotely adjusted my battery settings on the same day I contacted him, and at a reasonable price. Great service.

Jackie Palman · Jun 2026 Google

I can’t praise this firm enough. After hearing my solar panels rattling in very windy conditions, I contacted Solar Tech (as my installers no longer trade). Ronald was fantastic at explaining what he thought the issue was likely to be. Communication was great throughout keeping me fully updated. The team worked really hard on the day to carry out the necessary work. I can now sleep soundly at night without worrying about the solar panels on my roof. I would thoroughly recommend this firm. Thank you for sorting the problem out.

Carolyn Addison · Jun 2026 Google

I've spoken to Ron a couple of times with issues with my Givenergy installation. Such a friendly knowledge guy very highly recommended. Thank you very much for resolving my issues

michael fairhurst · May 2026

Ron took me through a diagnostic to confirm my GivEnergy Inverter had a fault. A common one as it turns out with the AC Inverter. As GivEnergy is defunct there is no immediate fix, aside from sourcing 2nd hand replacement. It may be that a fix becomes available over the summer which would make a lot of GivEnergy customers happy (Again)

Tony Deacon · May 2026

Made contact for assistance with my GiveEnergy battery that wasn't discharging. Ronald looked at my issue the same day, identified the root cause with a clear explanation of what was going on along with some options on how to remediate the issue. So far my battery is now working and keeping my fingers crossed that it stays this way. Ronald is a very experienced and knowledgeable engineer and I would recommend.

Al · Jul 2026 Google

Ronald was able to organise a brilliant electrician with extensive experience of GivEnergy systems local to me in the SW. I have now got a fully functioning system and suspect that my electricity bill will be substantially reduced or in credit over a year. Also when said electrician discovered an overvoltage in the my local grid, Ronald prepared a very lucid and comprehensive report of the situation which I have now supplied to my local grid. Cannot recommend Ron and Dan enough.

Ian Macmillan · Jul 2026 Google
Powerwall Faults

Common Powerwall problems we diagnose

Every fault below has a proven diagnostic path. Click through for the specific page or book a diagnostic if you're unsure.

Support

Tesla Powerwall diagnostics

Tesla Powerwall doesn't display traditional fault codes — faults appear as notifications in the Tesla app and in the Gateway web interface. We diagnose issues using app notifications, Energy History data, and Gateway logs.

Common fault patterns
·Gateway connectivity faults — WiFi, broadband loss
·Battery protection events — over/under voltage, temperature
·Backup reserve / island mode failures — grid outage issues
·Grid connection alarms — frequency, synchronization issues
Services

What we do for Powerwall owners

Remote Powerwall Diagnostic

We review Tesla app data, notification history, and Energy History to identify the exact fault without a site visit.

App notification analysis
Energy History review
Written engineer summary
Book remote diagnostic

Tesla App & Gateway Recovery

Gateway offline, WiFi not connecting, or app access lost? We recover connectivity and reconfigure the system.

WiFi / broadband troubleshooting
Gateway reconfiguration
App access recovery
Start recovery

On-Site Powerwall Investigation

Island mode testing, wiring verification, backup circuit inspection, Gateway settings check. Evidence-led site visit.

Component-level diagnostics
Wiring & circuit verification
Island mode testing
Discuss visit
Documents

Tesla Powerwall datasheets, manuals & warranty PDFs

Download datasheets, installation guides and warranty documents for Tesla Powerwall battery systems. Self-hosted and always current.

Product datasheets & specifications
Installation & commissioning manuals
Warranty terms & coverage documents
App & software setup guides
Wiring diagrams
Fault Codes

Tesla Powerwall fault code index

Having issues with your Tesla Powerwall? Our fault code index explains what each error means, common causes, and safe next steps.

·Battery communication & BMS faults
·Grid connection & frequency faults
·Powerwall app & WiFi connectivity errors
·Backup mode & Islanding errors

About Tesla Powerwall — what you need to know

Tesla Powerwall is an AC-coupled battery storage system designed to work with existing solar installations. Powerwall 2 (13.5kWh usable) connects to the AC side of a solar inverter via the Gateway, which manages grid connection, backup switching, and energy flow. Powerwall 3 integrates a solar inverter directly into the battery unit — eliminating the need for separate solar inverter and Gateway.

The Tesla app provides monitoring and control for operating modes (Self-Powered, Time-Based Control, Backup Reserve), backup reserve levels, and scheduling. The Gateway is the brains — it detects grid loss and switches to island mode (backup) within milliseconds. Most Powerwall 2 issues come from Gateway WiFi loss, backup reserve misconfiguration, or wiring faults.

Important: Powerwall is not a solar inverter — it's a battery storage system. If you have solar on Powerwall 2, there's a separate solar inverter on your AC side. Island mode is the process where Gateway detects grid down and switches to backup — it must happen within milliseconds to avoid triggering grid protection. This is why Gateway quality and WiFi stability matter.

If you're searching for Tesla Powerwall repair UK, Powerwall not charging, Powerwall backup not working, Tesla Gateway offline, or Tesla app not updating, STS provides independent diagnostic and support across the UK — not affiliated with Tesla.

Related problem pages
Battery not charging from solar →
Battery not discharging →
No backup during power cut →
Monitoring offline →
System not producing →
We also support

STS supports all major inverter and battery brands — not just Tesla Powerwall. If you have a mixed-brand system or are comparing options, visit the brand hub.

Browse all 19 brands
FAQ

Powerwall questions answered

Powerwall charges from solar via Gateway's energy management. Common causes: incorrect operating mode in Tesla app (Settings > Customize > Energy Exports should be Self-Powered or Time-Based Control), grid connection fault, or Gateway communication issue with solar inverter. Also check that solar system is actually generating. See guide →
Backup requires Gateway to detect grid loss and switch to island mode. If didn't happen: backup reserve may be set too low (below battery SoC at time of outage), Gateway may have tripped on islanding attempt, backup circuit not wired to Gateway, or Powerwall in low-priority mode. Check Tesla app Energy History to see battery SoC at outage time. See guide →
Gateway goes offline when it loses internet connection. Check WiFi LED on Gateway — solid green = connected, off = disconnected. If offline, check your router and Gateway's WiFi settings (accessible at Gateway's IP address via browser on local network). Router change may need factory reset of Gateway WiFi settings — requires installer credentials. Battery continues operating normally even when Gateway is offline.
Powerwall units are not field-repairable — internal components are not available as spares. Tesla operates a battery swap program for in-warranty units. Out-of-warranty failed Powerwalls are typically replaced. STS can assess whether the fault is in Powerwall itself or in Gateway, solar inverter, or wiring — a remote diagnostic first is essential before concluding Powerwall needs replacement.
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Ready to fix your Powerwall system?

Tell us what's happening. We'll review your details and come back with a clear diagnosis path — usually same day.

  • Not affiliated with Tesla
  • No fix, no fee
  • On-site visits available across Yorkshire

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Call 07944 877 329 Book free diagnostic