Skip to content
Fault triage · All solar brands

Solar System Problems — Diagnose & Fix Your Solar Fault

Use the sections below to find your fault type. Each page gives you a full diagnostic path — what to check, what the evidence means, and when to call an engineer.
  • Covers all major inverter and battery brands
  • Free remote diagnostic — results within 30 min · no fix, no fee
  • Most faults diagnosed without a site visit
Need help diagnosing a fault?

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 work
5.0
13 Trustpilot reviews
Trustpilot Google

I have a GivEnergy system consisting of two batteries, two inverters and a controlling EMS (Energy Management System) which has not worked since Nov 2025. After six months I discovered Solar Tech Support, reached out to them and Ron phoned me back – how often do you get that service? Could not be more helpful – worked directly with me over the phone, outside what I would call normal working hours. Lucid explanations and we were able to discuss the issues and history using camera and email history. As this was a very rare setup, Ron was able to access an EMS expert in the field to confirm the solution. One sunny day in, I am now only paying for standing charge and a few pence for spikes in grid consumption while battery catches up with house demand.

Ian · May 2026 Trustpilot

When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.

Sree · May 2026 Trustpilot

Ron want out of is way to help, nothing was to much. He was very thorough in what he did Very knowledgeable I would highly recommend Ron and his company He did a fantastic job for me. if you have any problems, he'll do his best to help you out and resolve your problem. I wouldn't hesitate to recommend them

Dennis Brown · May 2026 Trustpilot

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 Trustpilot

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

Phill · May 2026 Trustpilot

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 Trustpilot

Contacted Solar Tech Support in desperation. After explaining the issues I had with my system a diagnosis was made and a solution proposed. Fantastic service, even contacted a manufacturer to arrange replacement parts for me. Great communications, explained all they were doing and what I had to do, clearly and precisly. Followed up to confirm all was ok. Excellent service.

Mr Machin · May 2026 Trustpilot

After GivEnergy went into liquidation, just my luck, my battery started playing up (internal board crashed). Contacted my installer - not interested! Found Solar tech support on a Google search. Sooo glad I found this company! Ron is extremely helpful and has plenty of experience. He soon confirmed what the fault was, and helped me to get my system up and running again. Now moved my GivEnergy account to Solar tech support, and will definitely use again if I have more issues. Unusual to find such a helpful company in these times, no morons reading scripts, just direct contact with the engineer.

Keith Ballard · Apr 2026 Trustpilot

Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.

Hugh Speirs · Apr 2026 Trustpilot

Ron is a super star. Two months ago my GivEnergy battery failed a firmware upgrade leaving it a brick. My installer couldn't/wouldn't fix it. GivEnergy couldn't/wouldn't fix it. Then they went into administration and all hope was lost. A flurry of emails later and Ron had diagnosed the fault (failed USB flash drive, something I'd suspected) and talked me through resolving it. Two months of nothing resolved in about 3 hours. It's great to work with someone who pays attention to the details, knows that they're doing (not just following a script) and gets stuff sorted without a fuss or up-charging.

Christopher · Apr 2026 Trustpilot

I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration (their Trustpilot reviews don't lie!). So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.

customer · Apr 2026 Trustpilot

This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing . If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.

Andy Thomas · Apr 2026 Trustpilot

I sent a message on their website regarding a problem I have on my Givenergy system. Although not supplied by Ronald, I thought it was worth an email. Within the hour on a Saturday, he phoned and we discussed the problem. He logged in remotely and gave excellent advice. I'm too far away for his on-site help but he did diagnose the problem and was happy also to chat through my thoughts about an upcoming solar/battery install I'm planning. Great bloke.... if only he was nearer!

Philip · Apr 2026 Trustpilot

I have a GivEnergy system consisting of two batteries, two inverters and a controlling EMS (Energy Management System) which has not worked since Nov 2025. After six months I discovered Solar Tech Support, reached out to them and Ron phoned me back – how often do you get that service? Could not be more helpful – worked directly with me over the phone, outside what I would call normal working hours. Lucid explanations and we were able to discuss the issues and history using camera and email history. As this was a very rare setup, Ron was able to access an EMS expert in the field to confirm the solution. One sunny day in, I am now only paying for standing charge and a few pence for spikes in grid consumption while battery catches up with house demand.

Ian · May 2026 Trustpilot

When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.

Sree · May 2026 Trustpilot

Ron want out of is way to help, nothing was to much. He was very thorough in what he did Very knowledgeable I would highly recommend Ron and his company He did a fantastic job for me. if you have any problems, he'll do his best to help you out and resolve your problem. I wouldn't hesitate to recommend them

Dennis Brown · May 2026 Trustpilot

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 Trustpilot

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

Phill · May 2026 Trustpilot

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 Trustpilot

Contacted Solar Tech Support in desperation. After explaining the issues I had with my system a diagnosis was made and a solution proposed. Fantastic service, even contacted a manufacturer to arrange replacement parts for me. Great communications, explained all they were doing and what I had to do, clearly and precisly. Followed up to confirm all was ok. Excellent service.

Mr Machin · May 2026 Trustpilot

After GivEnergy went into liquidation, just my luck, my battery started playing up (internal board crashed). Contacted my installer - not interested! Found Solar tech support on a Google search. Sooo glad I found this company! Ron is extremely helpful and has plenty of experience. He soon confirmed what the fault was, and helped me to get my system up and running again. Now moved my GivEnergy account to Solar tech support, and will definitely use again if I have more issues. Unusual to find such a helpful company in these times, no morons reading scripts, just direct contact with the engineer.

Keith Ballard · Apr 2026 Trustpilot

Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.

Hugh Speirs · Apr 2026 Trustpilot

Ron is a super star. Two months ago my GivEnergy battery failed a firmware upgrade leaving it a brick. My installer couldn't/wouldn't fix it. GivEnergy couldn't/wouldn't fix it. Then they went into administration and all hope was lost. A flurry of emails later and Ron had diagnosed the fault (failed USB flash drive, something I'd suspected) and talked me through resolving it. Two months of nothing resolved in about 3 hours. It's great to work with someone who pays attention to the details, knows that they're doing (not just following a script) and gets stuff sorted without a fuss or up-charging.

Christopher · Apr 2026 Trustpilot

I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration (their Trustpilot reviews don't lie!). So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.

customer · Apr 2026 Trustpilot

This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing . If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.

Andy Thomas · Apr 2026 Trustpilot

I sent a message on their website regarding a problem I have on my Givenergy system. Although not supplied by Ronald, I thought it was worth an email. Within the hour on a Saturday, he phoned and we discussed the problem. He logged in remotely and gave excellent advice. I'm too far away for his on-site help but he did diagnose the problem and was happy also to chat through my thoughts about an upcoming solar/battery install I'm planning. Great bloke.... if only he was nearer!

Philip · Apr 2026 Trustpilot

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, usually starting from just £75.

How to identify your solar problem

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.

When to call a professional

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:

Burning smell or visible smoke: Stop using the system immediately. Isolate the inverter at the consumer unit. Do not restart. Call 999 if you smell burning — this is a fire hazard.
Arcing, sparking, or visible damage: Do not touch the system. Isolate at the consumer unit and call a qualified solar engineer or electrician. Physical damage to cables, connectors, or inverter enclosures requires professional repair.
Water ingress: If water has entered the inverter, battery, or any electrical enclosure, isolate and do not operate. Contact a solar engineer — water damage can cause electrical faults that may not be immediately obvious.

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.

Not sure which problem you have?

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.

Fault behaviour varies by brand

The problem pages above are brand-agnostic starting points. For brand-specific fault codes, portal steps, and known firmware issues, go to your inverter or battery brand directly.

FAQ

Common questions

The most common sudden failures are an inverter fault (often shown by a red light), loss of grid supply, a tripped AC isolator, or a WiFi issue that makes the system appear offline when it is still generating. Start with the inverter display — any fault code or unusual light state will point you in the right direction. Use the full triage guide button above if you are unsure where to start.
Check your system mode settings first. Many batteries default to Eco Mode after a firmware update, which prevents scheduled or grid charging. Also check your CT clamp direction — a reversed CT clamp is one of the single most common causes of a battery appearing not to charge. See Battery not charging and CT clamp installed wrong.
It depends on the fault. If the inverter has shut itself down with a fault code, leave it in that state — the protection trip is intentional. Do not attempt to reset repeatedly. If you smell burning, see physical damage, or notice arcing, isolate the system at the consumer unit and do not restart it. Call a qualified engineer.
Yes — the majority of solar faults can be fully diagnosed remotely. With access to your monitoring portal data, inverter event logs, and a short walkthrough of your setup, an experienced engineer can identify the cause of most faults without a site visit. Free remote diagnostics — no fix, no fee.
Many faults can be fixed remotely — these include configuration settings, software issues, firmware updates, and connectivity problems. We can guide you through resets, parameter adjustments, and other non-invasive fixes without a site visit. However, physical faults (damaged panels, broken cables, faulty hardware components) require an on-site inspection and repair. During a remote diagnostic, we'll identify whether your specific fault can be fixed remotely or if a site visit is needed.
A free remote diagnostic provides a full diagnosis with recommended actions — pay only if we fix. Many configuration and software issues can then be resolved during the same session at no extra cost. If an on-site visit is needed, repairs typically start from £245 depending on the fault and parts required. In many cases, fixing a fault is much cheaper than replacing the entire system — and it almost always returns your investment through years of restored generation and export revenue.
Some basic troubleshooting is safe — we'll guide you through system resets, checking settings, and reviewing logs. However, never open the inverter or battery enclosures yourself; the high-voltage components inside can be dangerous. Always isolate the system at the consumer unit before touching any electrical connections. If you're uncertain about any step, stop and ask — it's much safer and often faster to get professional guidance. We're here to help you understand the problem and guide you toward the right solution, whether that's a simple reset or a professional repair.
Get help

Not sure which fault you have?

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.

  • Independent — not tied to any manufacturer
  • Free remote diagnostic · no fix, no fee
  • Written report included

By submitting you agree to be contacted about your diagnostic request. We don't share your data with 3rd parties.

Call 07944 877 329 Book free diagnostic