Solar Panel Repairs & Faults

Solar panel systems are durable and generally low‑maintenance, but like any electrical system they can occasionally develop faults. This page outlines the most common solar panel issues, typical symptoms to look out for, and how Mr Solar can help.

Common Symptoms of Solar Panel Faults

You may be experiencing a problem with your solar PV system if you notice any of the following:

Reduced energy production
Lower Feed‑in‑Tariff (FIT) or export payments
No generation at all
Fault codes or warning lights on the inverter
Generation meter not working
Fuses or breakers tripping repeatedly

If any of these issues occur, it’s important to have the system checked as soon as possible to avoid further damage or loss of income.

Common Solar Panel Repairs & Failures

Inverter Failure

The inverter is a critical component of your solar PV system. It converts the direct current (DC) produced by the panels into alternating current (AC) that can be used in your home or business.

Inverters can fail for several reasons, including:

Overheating
Electrical overloading
Natural wear and tear
Clicking noise on start up

Most inverters have an expected lifespan of 7–12 years, so faults become more common as systems age.

Wiring & Connection Problems

Loose, damaged, or degraded wiring can lead to:

Reduced power output
Intermittent system outages
Tripping fuses or breakers
Potential fire hazards

These issues should always be assessed by a qualified professional.

Faulty Solar Panels

Solar panels consist of multiple individual cells. Over time, these can become damaged or fail due to:

Hail or storm damage
Poor initial installation
Animal droppings
Manufacturing defects
Long‑term environmental exposure

Even a small number of faulty panels can significantly reduce the overall performance of your system.

Dirty or Shaded Panels

Build‑up of dirt, pollen, leaves, or debris can reduce panel efficiency. Shading from trees, buildings, or other obstructions can also dramatically impact output.

Where installed, panel optimisers can help minimise losses caused by shading, but regular inspection and maintenance remain important.

Animal Damage

Birds and rodents can cause serious damage by:

Chewing through cables
Nesting beneath panels creating fire risks
Bird Poo staining panels

To prevent this, Mr Solar installs protective guarding around the edges of solar arrays, helping keep animals away from wiring and components.

Thermal Drone Surveys

Thermal drone surveys provide a fast, non-invasive way to identify faults within solar PV systems that may not be visible from the ground. Using high-resolution thermal imaging, we can detect overheating panels, defective cells, failed bypass diodes, loose connections, and other issues that cause reduced performance or safety risks. This method allows large or difficult-to-access installations to be inspected safely and accurately without disruption. Thermal drone surveys are particularly effective for diagnosing inverter-related performance issues and underperforming strings, helping to target repairs quickly and minimise downtime.

Expert Diagnosis & Repair

If you’re experiencing any issues with your solar panel system, it’s essential to contact a qualified solar installer or electrician for proper diagnosis and repair.

Whatever the issue, Mr Solar can quickly identify and resolve the problem. We cover Norfolk and Suffolk, offering some of the fastest and most reliable testing and inspection services in the industry, backed by over 15 years’ experience.

📞 Call us today on 01603 394104 or 01493 289118

Contact Us

Use the form below and a member of our team will be in touch.

Frequently Asked Questions (FAQs)

How do I know if my solar panel system is faulty?

Common signs include reduced energy generation, lower feed-in payments, inverter fault codes, tripping fuses, or no generation at all. If you notice any of these symptoms, it’s best to arrange a professional inspection.

Is it safe to use my system if there is a fault?

Not always. Electrical faults, damaged wiring, or inverter issues can present safety risks, including fire hazards. If you suspect a serious fault, switch the system off if safe to do so and contact a qualified professional immediately.

How long do solar inverters last?

Most solar inverters have an expected lifespan of 7–12 years, depending on usage, environment, and manufacturer. Older inverters are more likely to develop faults and may need repair or replacement.

Can dirty or shaded panels really make a difference?

Yes. Even partial shading or surface dirt can significantly reduce system output. Regular inspections and maintenance help ensure your system performs at its best.

Do you repair systems you didn’t install?

Yes. Mr Solar carries out testing, inspection, and repairs on existing solar PV systems, regardless of the original installer.

What areas do you cover?

We provide solar testing, inspection, and repair services across Norfolk and Suffolk.

Compliance & Safety Information

All solar PV testing, inspection, and repair work carried out by Mr Solar is completed in accordance with current UK regulations and industry standards, including:

BS 7671 (IET Wiring Regulations)
MCS guidance where applicable
Manufacturer installation and safety requirements

All work is undertaken by qualified and experienced electricians and solar engineers. Any remedial work required will be clearly explained before proceeding.

Please note:

Customers should not attempt to repair or interfere with solar PV systems themselves.
Working at height and with electrical systems carries inherent risks and must only be undertaken by competent professionals.