Ron was really helpful. He remotely adjusted my battery settings on the same day I contacted him, and at a reasonable price. Great service.
Tesla Powerwall Support — Gateway Faults, Backup & Islanding
- Not affiliated with Tesla
- Powerwall 2 and Powerwall 3
- Gateway and app diagnostics
Gateway offline, backup not working, app not updating — we diagnose Tesla systems remotely in a single session.
Book your free remote diagnosticSafety: do not attempt to repair the Powerwall unit itself. Gateway WiFi resets require installer credentials.
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.
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
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)
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.
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.
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.
Powerwall stuck at low state of charge despite solar generation. Usually caused by incorrect operating mode in Tesla app (Self-Powered vs Time-Based Control), grid connection fault, or Gateway communication issue with solar inverter. Check Energy Exports setting.
See diagnostic guide →Powerwall not feeding energy to home during peak hours or overload periods. May indicate incorrect operating mode, grid connection fault, or Gateway control issue. Check Tesla app operating mode and discharge settings.
See diagnostic guide →Operating mode (Self-Powered, Time-Based Control, Backup Reserve) not working as configured. Requires Tesla app access to review settings and energy flow logic. Gateway orchestrates the mode transitions.
See diagnostic guide →Backup circuit remains unpowered during grid outage despite battery charge. Possible causes: backup circuit not wired to Gateway, Gateway failed to island, or Powerwall in low-priority mode. Islanding is the process where Gateway detects grid down and switches.
See diagnostic guide →Backup mode triggered but backup reserve not activated. Usually caused by backup reserve set too low relative to battery SoC at time of outage. Backup reserve is the minimum charge held for emergencies. Check Tesla app backup settings.
See diagnostic guide →Gateway fails to detect grid loss and switch to island mode during outage. May be caused by slow Gateway response, islanding protection trip, or Gateway hardware fault. This is a critical safety function requiring site visit for testing.
See diagnostic guide →App shows no Powerwall data or connection lost. Gateway has lost internet connection. Check WiFi LED on Gateway (solid green = connected). If offline, check router and Gateway WiFi settings. Factory reset of WiFi may be needed after router change.
See diagnostic guide →Tesla app opens but Powerwall appears disconnected or shows stale data. May indicate Gateway connectivity issue, WiFi dropout, or cloud synchronization lag. Battery system continues operating normally even when app offline.
See diagnostic guide →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.
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.
Tesla App & Gateway Recovery
Gateway offline, WiFi not connecting, or app access lost? We recover connectivity and reconfigure the system.
On-Site Powerwall Investigation
Island mode testing, wiring verification, backup circuit inspection, Gateway settings check. Evidence-led site visit.
Tesla Powerwall datasheets, manuals & warranty PDFs
Download datasheets, installation guides and warranty documents for Tesla Powerwall battery systems. Self-hosted and always current.
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.
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.
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 brandsPowerwall questions answered
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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Got a solar fault or need a quick answer? Drop us a message — we usually reply within a few minutes. Mon–Fri, 9am–7pm.