Solar panels are known for their reliability and long lifespan, but like any technology, issues can occasionally happen. If part of your solar PV system stops working, it doesn’t necessarily meant the whole system has failed, or that you need an expensive replacement. Understanding what happens when a solar panel underperforms can help you act quickly, protect your investment and keep your energy savings on track.
How Common Are Solar Panel Problems?
Modern solar panels are designed to last 25 years or more, with many continuing to generate electricity efficiently for over 40 years. Outright panel failure is rare, with most issues being linked to maintenance, wiring, inverters or environmental factors. However, even a single faulty component can affect the performance of the whole solar PV system.
Signs Your Solar Panel May Have Stopped Working
You might not always notice a problem straight away, but common warning signs include:
- A sudden unexplained drop in output
- Error messages or warning lights on your solar inverter
- Higher electricity bills despite similar usage
- Monitoring apps showing reduced or zero generation
- Visible damage, heavy dirt build up or shading on solar panels
If you notice any of these then it’s usually a good idea to arrange an inspection by an MCS accredited installer.
What Causes Panels to Stop Working?
Several factors can affect solar panel performance:
Inverter Faults
The inverter is often the most common point of failure in a solar PV system. If it stops working, your panels may still be generating electricity but it won’t be usable in your home.
Electrical or Wiring Issues
Loose connections, damaged cables, or ageing components can interrupt the flow of electricity and reduce system efficiency.
Environmental Damage
Falling debris, severe weather, and long term exposure to the elements can cause cracks or micro-fractures in solar panels.
Dirt, Debris and Shading
Bird droppings, leaves, moss or new shading from trees and nearby buildings can significantly reduce output if not addressed through regular maintenance.
Does One Faulty Panel Affect the Whole System?
In many cases one faulty panel will bring down the output of the entire system. Traditional string inverters operate with multiple panels connected together to form a string, meaning if one panel is underperforming, the entire string will underperform. Systems with power optimisers or microinverters are less affected, but faults can still impact overall performance. This is why timely diagnostics and repair are so important.
Can a Fault Solar Panel Be Repaired?
Not all issues require panel replacement. Depending on the cause, solutions may include:
- Replacing or repairing wiring and connectors
- Resetting or replacing the solar inverter
- Cleaning panels to restore output
- Replacing a single damaged panel rather than the full array
An MCS certified installer can identify whether repair or replacement is the most cost effective option.
The Importance of Regular Solar Maintenance
Routine maintenance helps prevent small issues from becoming major problems. A professional solar service typically includes:
- Performance and safety checks
- Inspection of panels, inverter and electrical connections
- Identification of early faults or degradation
- Advice on improving system efficiency
For solar PV systems in the South East, where weather conditions and pollution can vary, regular servicing is particularly valuable.
What Should You Do If Your Solar Panel Stops Working?
If you suspect a fault, check your inverter display or monitoring app and carry out a visual check, looking for obvious damage or heavy soiling on your panels. Contact an MCS accredited installer for diagnosis and repair, letting them know of any fault codes or warning lights that appear on your inverter. Avoid attempting DIY repairs as this can be unsafe and will usually invalidate your warranty.
Professional Solar Repair and Servicing in the South East
At SolarTherm UK we specialise in solar PV system maintenance and repair across the South East. Whether your system has stopped working entirely or you’ve noticed a gradual decline in output, our experienced engineers can identify the issue and restore your system’s efficiency.
Need Help With Your Solar Panels?
Contact SolarTherm UK today to arrange a professional inspection and keep your solar investment working at its best. If you are an existing customer please visit our Customer Support Helpdesk to report any issues you may have with your solar PV system.
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