Signs Your Solar Panels Need Repairing and What to Do Next
Solar panels are built to last, with most systems designed for a lifespan of 20 to 25 years, but faults do happen, and the signs are not always obvious. A gradual drop in generation, an unfamiliar warning light, or a panel that stops contributing can go unnoticed for months.
Knowing the signs your solar panels need repairing and acting on them promptly is the most effective way to protect your investment and avoid the escalating damage that comes from leaving solar panels not working longer than necessary.
Common Signs Your Solar Panels May Need Repair
Keeping up with domestic and commercial solar panel maintenance means knowing what to look for. These are the five most common indicators that something may be wrong.
1. Sudden Drop in Energy Output
A sustained solar panel output drop is one of the clearest signs that something is wrong. If your generation figures are noticeably lower than they were at the same time last year, or significantly behind what your monitoring system predicted, that gap is worth investigating. Seasonal variation is normal, but consistent underperformance that cannot be explained by weather or shading usually points to a fault in the system.
2. Solar Inverter Error Messages
The inverter converts the electricity your panels generate into a usable form, and solar inverter problems are often the first to show up. Most modern inverters display fault codes or warning lights when something is wrong. If yours is showing an alert you do not recognise, or cycling through error states repeatedly, that information is worth acting on promptly.
3. Visible Damage to Panels
A visual check from ground level is a useful first step in any solar PV troubleshooting process. Cracked glass, discolouration, burn marks, or panels that have shifted position are all signs that physical damage may be affecting performance. Loose or exposed wiring is another indicator, particularly after strong winds or heavy weather. You do not need to access the roof, and you should not attempt to do so.
4. Monitoring System Showing Zero Production
If your monitoring app is showing zero generation during daylight hours, that is a clear solar panel fault requiring attention. The inverter may have shut down, a circuit breaker may have tripped, or there may be a fault within the panels themselves. A system that is connected but producing nothing is not operating as it should, and the cause needs to be found.
5. Frequent System Shutdowns
Most solar systems shut down automatically when they detect a fault, which is a safety feature rather than a sign of failure in itself. But if your system is switching off repeatedly, that pattern is a reliable indicator that you have solar panels not working correctly somewhere in the system, which are triggering a protective response. Frequent shutdowns are worth treating as an electrical issue until a qualified engineer confirms otherwise.
What Causes Solar Panels to Stop Working?
Understanding why solar panels stop working can help you respond more effectively when a fault occurs. Inverter failure is among the most common causes: inverters typically have a shorter operational lifespan than the panels themselves, and solar inverter problems often develop gradually before resulting in a full shutdown.
Wiring degradation and connector faults are also frequent culprits, particularly in older installations. Panel degradation is a natural process, but it accelerates without routine solar panel maintenance. Storm damage, debris impact, and persistent shading from new obstructions can each reduce output significantly. In some cases, the issue lies with how the system has been configured rather than any single failed component.
What You Should Check Before Calling a Repair Specialist
A few safe checks are worth doing before you call a repair specialist. They will not resolve the fault, but they will help you describe it accurately.
- Inverter Display: Note any warning lights or fault codes, including code numbers.
- Monitoring Data: Look back over recent weeks to identify when the solar energy system fault began.
- Ground-Level Check: Look for cracks, discolouration, or debris on the panels. Do not attempt to access roof-mounted panels yourself.
- Circuit Breakers: See whether any breakers linked to the solar system have tripped. Reset once and monitor.
- Recent Changes: Consider whether roof work, tree growth, or system modifications may have affected performance.
When to Call a Solar Panel Repair Professional
Some issues can be identified through the checks above, but a professional solar panel inspection is the only way to diagnose a fault with certainty and fix it safely. You should contact a solar panel repair service if your inverter is showing persistent error codes, if your system is producing little or no electricity over several consecutive days, if you have spotted physical damage to any panel, or if your circuit breaker keeps tripping.
The longer you go with solar panels not working correctly, the greater the risk of further damage. A qualified engineer will assess the full system and explain what needs to be done before any work begins.
How Professional Solar Panel Repairs Work
A qualified engineer begins with a full system diagnostic, testing each component to find the fault. Every solar panel inspection covers the panels, inverter, wiring, and electrical connections.
- Diagnostic Testing: Output is measured at the panel level to identify underperforming components.
- Inverter Checks: Tested to determine whether it needs reconfiguring, repairing, or replacing.
- Electrical Testing: Wiring and connectors are checked for deterioration.
- Panel Inspection: Each panel is assessed for damage not visible from ground level.
- Component Replacement: Options are discussed before any work proceeds.
This is the foundation of a reliable solar panel repair service and sound ongoing solar panel maintenance.
Act Early and Protect Your System's Performance
Both residential and commercial solar systems are reliable, but no system is fault-free for over two decades. If the issue of solar panels not working as expected has brought you here, that is reason enough to arrange an assessment.
At SESC Solar Service, our engineers carry out thorough diagnostic inspections across all system types. We are MCS-certified, NICEIC-registered, and back all work with a lifetime warranty. Call 01747 445 509 or use our contact form to book a solar panel repair service.
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