Backup not working — we diagnose Tesla systems remotely in a single session. Gateway or app offline? Follow our free Gateway offline guide, and if the Gateway still won't connect, we can set it up on site, from £195.
Book your free remote diagnosticGateway offline guideSafety: do not attempt to repair the Powerwall unit itself. Gateway WiFi resets require installer credentials.
We reached out to Solar Technical Support after our solar energy system stopped working. As GivEnergy 'solar orphans,' we have been extremely pleased with the service from STS - our system was back up and working within a day of us contacting them. We found other solar engineers reluctant or unable to help us, so it has been great to find this organisation. We would definitely use them again and would recommend them to anyone, especially GivEnergy orphans!
Excellent response to diagnose a problem on our SolarEdge installation. Kept us informed at every step. Diagnosis quickly completed and solution implemented.
Saw Ron was advertising a refurbished 9.5 kWh on Facebook, within a couple of days Ron delivered and installed it into my current system, my existing 9.5 batter was also. Gen 2 running on firmware 3022. Literally took him 30 mins, from start to finished, within a couple of days the two batteries had balanced themselves, it’s now been a week with Predbat in control. Working perfectly , could not recommend Ron more highly Top Man!
Ron is one of those rare finds - an engineer's engineer. He insightfully and accurately diagnosed the problems with our GivEnergy system, very quickly, which helped get us back on track. We will be using him again!
The ONLY technical person, who has ever exceeded my own high standards !!!! Being a professional commissioning engineer of over 37yrs in the field of emergency power generation, I approached Ron for some advice on a GivEnergy battery issue as happy to state I don't know everything. Not only did he reply immediately, his advice got the system working and all on a Sunday. You really do not get support as good as this anywhere now for anything. Thank you Ron
Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone
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. Meanwhile, the Powerwall usually keeps running, but the app can't show you a fault until the Gateway reconnects.
See diagnostic guide →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. We don't set up or diagnose WiFi remotely or over the phone: it's quicker and more reliable done on site.
We review Tesla app data, notification history, and Energy History to identify the exact fault without a site visit.
Gateway offline, WiFi not connecting, or app access lost? We recover app access and reconfigure the system, and if the Gateway has lost your WiFi, we can set it up on site, from £195.
Island mode testing, wiring verification, backup circuit inspection, Gateway settings check. Evidence-led site visit.
Download datasheets, installation guides and warranty documents for Tesla Powerwall battery systems. Self-hosted and always current.
Having issues with your Tesla Powerwall? Our fault code index explains what each error means, common causes, and safe next steps.
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, disconnects from the network within the 0.5 s limit set by the G98/G99 connection standards, and switches to island mode (backup). 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 the Gateway detects that the grid is down, disconnects from it and switches your home to backup. It doesn't need WiFi or the internet to do this.
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 brandsIndependent Tesla Powerwall problems support across the UK — 4 faults STS engineers diagnose and repair. Free remote diagnostic, no fix no fee.
See Tesla Powerwall common problems & faultsIndependent solar PV and battery diagnostic, repair and recovery services across the UK. No-fix-no-fee remote diagnostic — same/next day.
See servicesDownload Tesla Powerwall datasheets, installation manuals, warranty PDFs, app guides and wiring diagrams. Powerwall, Powerwall+, Powerwall 3, and Gateway.
See documents & downloadsTell us what's happening. We'll review your details and come back with a clear diagnosis path — usually same day.
Due to unprecedented demand we’re currently only carrying out on-site work in Yorkshire, and replies are taking up to 7 days. Remote diagnostics continue for the whole UK as normal.
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