A remote diagnostic identifies the root cause of most solar and battery faults — often within 30 minutes. All major brands supported. You get a written report with the fault, the fix, and a cost estimate.
Book your free remote diagnosticHow diagnostics workBrilliant support to get my solar battery working again. I didn’t expect help on a Saturday but Ron answered the phone, listened and sent me the information I needed to get it going, answered questions etc. A brilliant service I’d happily recommend.
Ron was brilliant. He really tried to help. He spent hours trying to fix our GivEnergy AIO and ultimately it became apparent that it needed parts to fix the BMS management system. As there appears to be no replacement parts available on the market, he gave excellent advice on what options are now available to move forward. He is incredibly helpful and knowledgeable.
Called back within a day and gave good advice.
Ron was extremely helpful and tried his best to repair/reset our GivEnergy inverter remotely. In the event he was unsuccessful but he couldn’t have been more helpful. If you have problems with a GivEnergy system please contact him. Highly recommended
Big thanks to Ron. He was incredibly patient and helpful over the phone, taking the time to walk myself and the installer through every troubleshooting step. Through lots of testing he figured out the issue was definitely a hardware issue, which allows us to consider our next steps. Support fees are clear and they operate a “no fix no fee” policy. It is rare to find that kind of honesty combined with dedicated phone support nowadays. I highly recommend Ron, if you need help with your solar system don’t hesitate to give him a call.
A superb service from Ron who went beyond the normal service received from other Tech support companies. I live abroad and was badly let down when my givenergy system failed (and the company went bankrupt) and the local supplier ran away from the problem. Ron sorted the problem and even accessed specialist coding for the inverter that would not be available for suppliers. Ron also ran a full diagnostic to insure that all was in good working order afterwards. Without Rons support and patient assistance I doubt I would ever have got the system back up and running. Well done and thankyou and you have a customer for the future.
Brilliant support to get my solar battery working again. I didn’t expect help on a Saturday but Ron answered the phone, listened and sent me the information I needed to get it going, answered questions etc. A brilliant service I’d happily recommend.
Ron was brilliant. He really tried to help. He spent hours trying to fix our GivEnergy AIO and ultimately it became apparent that it needed parts to fix the BMS management system. As there appears to be no replacement parts available on the market, he gave excellent advice on what options are now available to move forward. He is incredibly helpful and knowledgeable.
Called back within a day and gave good advice.
Ron was extremely helpful and tried his best to repair/reset our GivEnergy inverter remotely. In the event he was unsuccessful but he couldn’t have been more helpful. If you have problems with a GivEnergy system please contact him. Highly recommended
Big thanks to Ron. He was incredibly patient and helpful over the phone, taking the time to walk myself and the installer through every troubleshooting step. Through lots of testing he figured out the issue was definitely a hardware issue, which allows us to consider our next steps. Support fees are clear and they operate a “no fix no fee” policy. It is rare to find that kind of honesty combined with dedicated phone support nowadays. I highly recommend Ron, if you need help with your solar system don’t hesitate to give him a call.
A superb service from Ron who went beyond the normal service received from other Tech support companies. I live abroad and was badly let down when my givenergy system failed (and the company went bankrupt) and the local supplier ran away from the problem. Ron sorted the problem and even accessed specialist coding for the inverter that would not be available for suppliers. Ron also ran a full diagnostic to insure that all was in good working order afterwards. Without Rons support and patient assistance I doubt I would ever have got the system back up and running. Well done and thankyou and you have a customer for the future.
Solar PV and battery storage systems are reliable, but they are also complex installations with hundreds of components and control points. Faults can develop over time for a variety of reasons — some are simple configuration errors that can be fixed remotely in minutes, others require physical inspection or component replacement on site. The good news is that most faults have a specific, identifiable cause. With the right diagnostic approach, you can understand what's wrong and decide on the best path forward.
At STS Solar Tech Support, we specialise in diagnosing solar and battery faults across all major brands. Whether your system uses GivEnergy, SolarEdge, Growatt, Sunsynk, Solis, Enphase, Huawei, Fox ESS, Fronius, Tesla Powerwall, or any of the many other inverter and battery brands available in the UK, we have the knowledge and tools to identify the root cause. We maintain detailed fault databases built from hundreds of real repair jobs, covering everything from firmware quirks to configuration best practices for every brand we support.
If you're not sure where to start, our remote solar diagnostic service is designed exactly for this — we analyse your system data, inverter logs, and setup to provide a full diagnosis without a site visit — the remote diagnostic is free, and most remote fixes are just £75.
Your system has stopped generating, is producing less than expected, or has lost backup capability.
Panels and inverter installed but generating zero — or a figure that makes no sense.
Generating, but not as much as it should be. Output has dropped or never met expectations.
Battery didn't switch to EPS or backup mode when the grid went down.
Fault lights, display errors, or an inverter that won't start.
Battery not charging, not discharging, or showing communication errors.
Portal offline, WiFi not connecting, or data not updating.
Installation or setup errors causing incorrect behaviour.
Export payment issues, tariff registration, and missing income.
No export payments arriving — SEG registration, metering, or supplier billing issue.
Smart Export Guarantee application stuck, rejected, or taking too long.
Feed-in Tariff payments missing, late, or stopped after supplier change.
Post-installation issues, snagging, and workmanship concerns.
Faults specific to off-grid and island-mode systems — battery protection trips, charge failures, and generator interaction problems.
The problem sections above cover the main categories of faults. If you're not sure which one applies to your situation, use these starting points to narrow things down. If your system is producing nothing at all — no generation, no power, completely offline — start there. This covers total system failures, dead inverters, and zero-output scenarios.
If your system is generating but the output is consistently lower than you'd expect — especially if it has dropped over time or never reached the performance figures your installer quoted — check the system underperforming page. This covers partial faults, soiling, shading, and efficiency losses that don't stop generation entirely.
For battery-specific issues, if your battery isn't storing energy or the system won't charge it, go to battery not charging. If the battery is full but won't discharge or the system won't use the stored energy when you need it, check battery not discharging. Battery faults often stem from configuration settings rather than hardware failure, so these pages focus on the most common causes.
If you're seeing fault codes on your inverter display or in your monitoring app, the fault code itself is usually the fastest way to diagnose the issue. Check your brand's specific page — we have detailed fault code guides for GivEnergy, SolarEdge, Growatt, Sunsynk, Solis, and all other major brands. You can also browse the fault codes section to look up error codes across multiple brands.
If the fault is related to export payments — your system is generating and the grid is importing, but you're not receiving payment from your export tariff scheme — see our dedicated guide on not being paid for solar export. This usually comes down to export metering, tariff registration, or communication settings. A remote diagnostic can quickly determine whether the issue is technical or administrative.
Still not sure where to start? The best first step is a remote diagnostic. Tell us what you're seeing, share your monitoring data, and we'll pinpoint the problem in most cases without needing to visit your site.
Some solar faults are safe to investigate yourself with guidance — checking settings, restarting the system, or looking at logs. Others require professional intervention. Safety is our priority, so please call an engineer immediately if you see any of these signs:
Beyond safety-critical issues, consider calling a professional if DIY troubleshooting hasn't resolved the problem. If you've checked the obvious things — restart the inverter, check the WiFi, review the settings — and the fault persists, a remote diagnostic can identify the cause. If the system has been offline or non-functional for more than a week, don't let it linger — the sooner you diagnose, the sooner you can get back to generating. If error codes keep reappearing after a reset, that's a signal that the underlying cause needs professional attention, not repeated resets. We're here to help: contact us for urgent situations or book a diagnostic to get started.
The Solar Not Working page walks you through the full triage process — inverter, battery, monitoring, and grid — in one place. Most people find their fault within two or three steps.
Describe what the system is doing — fault lights, generation figures, what the app shows — and we’ll identify the root cause. Most faults are diagnosed remotely in 30 minutes.
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