If your solar panels are not generating as much electricity as they used to, your inverter is showing a fault, your monitoring system has stopped working, or part of your solar PV installation has been damaged, you may need a specialist solar panel repair company.

Trusted Tradesman helps homeowners, landlords and businesses find solar panel repair specialists in Cornwall who can investigate faults with existing solar PV systems and carry out appropriate repairs, maintenance and remedial work.

Solar PV systems contain electrical equipment as well as panels, cabling, isolators, inverters and monitoring equipment. A problem with any part of the installation can affect the performance of the whole system. For this reason, solar panel repairs are best carried out by an appropriately qualified and experienced professional.

Find Solar Panel Repair Specialists in Cornwall

Whether your solar panels have stopped producing electricity completely or you have noticed a gradual reduction in generation, the cause is not necessarily the panels themselves.

A solar PV specialist can investigate the system to establish where the problem lies. Depending on the installation, this could involve checking the panels, inverter, DC and AC connections, isolators, cabling, monitoring equipment and other components.

Common reasons for contacting a solar panel repair specialist include:

Solar panels producing little or no electricity
Solar inverter faults
Inverter displaying an error code
Solar monitoring system not working
Individual panels or strings underperforming
Damaged solar panels
Faulty or damaged cabling
Problems with DC isolators
Electrical faults
Solar PV system shutdowns
Intermittent generation
Unexpected drops in electricity generation
Water or moisture ingress
Storm or weather-related damage
Problems following an unsuccessful installation
Older solar PV systems requiring remedial work
Solar systems requiring inspection before a property sale

The appropriate repair will depend on the nature and age of the installation.

I Spy Solar Cornwall and Devon, Atom Energy SW and other solar specialists operate in Cornwall, while the Cornwall Green Trades directory currently lists dozens of businesses with MCS-certified Solar PV credentials.

Solar Panel Repair Services

Solar panel repairs can involve considerably more than replacing a damaged panel.

A competent solar PV repair specialist should be able to diagnose the underlying problem before recommending remedial work.

Solar panel fault finding

If your system has stopped generating or generation has fallen unexpectedly, fault finding is often the first step.

A specialist may inspect the installation and test different parts of the system to identify whether the problem originates with the panels, inverter, electrical connections, cabling, monitoring equipment or another component.

This can be particularly important with older installations where the original installer may no longer be operating.

Solar inverter repairs and replacement

The inverter is one of the most important components of a solar PV installation because it converts the electricity generated by the panels into usable AC electricity.

An inverter displaying an error message does not necessarily mean that the inverter itself has failed. The underlying problem could be elsewhere in the system.

A solar PV engineer can investigate the fault and determine whether the appropriate solution is a repair, replacement, reset, configuration change or another form of remedial work.

In some cases, an older inverter may be beyond economical repair and replacement may be the more appropriate option.

Damaged solar panels

Solar panels are designed for outdoor use, but they can still be damaged by severe weather, impact, falling objects or other external causes.

Cracked or visibly damaged panels should not simply be ignored. Damage can potentially affect the performance and electrical safety of the installation.

A specialist can assess the panel and determine whether it can be repaired or whether replacement is required.

Solar PV electrical faults

A solar PV installation includes electrical equipment on both the DC and AC sides.

Faults can involve:

DC cabling
AC cabling
connectors
isolators
protective devices
terminals
generation meters
distribution equipment
inverter connections

Solar PV systems involve particular electrical and working-at-height hazards, which is why appropriate competence and risk assessment are important when carrying out repair work. MCS’s Solar PV installation standard highlights the combination of electrical shock, working-at-height and manual-handling risks associated with PV systems.

Solar monitoring problems

Many modern solar installations provide generation information through an online portal or mobile application.

If your panels appear to be working but the monitoring system has stopped reporting generation, the problem may lie with the communications or monitoring equipment rather than the PV panels themselves.

A solar specialist can investigate whether the issue relates to the inverter, data logger, internet connection, communications equipment or monitoring platform.

Solar PV system inspections

A solar PV inspection can be useful where the system is underperforming but the cause is not immediately obvious.

An inspection may include examination and testing of relevant parts of the installation, assessment of the inverter and monitoring system, and checks for visible damage or other faults.

Specialist solar PV companies also offer formal inspection and testing services for existing systems, including health checks and compliance-related assessments.

Common Solar Panel Problems

There are several warning signs that your solar PV system may need attention.

Your solar panels are producing less electricity

A gradual reduction in generation can have many possible causes.

These include changes in shading, equipment degradation, inverter problems, panel faults, electrical faults, soiling or problems affecting one part of the PV array.

If generation has fallen significantly compared with previous years, it may be worthwhile having the system investigated rather than assuming that reduced output is simply normal ageing.

Your solar panels have stopped working

If your system has suddenly stopped generating electricity, check the monitoring system and inverter display for any obvious warning messages.

However, homeowners should not attempt to dismantle or electrically test a solar PV system themselves.

Solar PV panels can continue producing electricity whenever they are exposed to light, meaning specialist work is required to safely investigate electrical faults.

Your inverter is showing an error

An inverter error message can provide useful information about a potential fault, but interpreting the message correctly may require specialist knowledge.

Record the error code or message if possible and provide it to the solar PV engineer when requesting assistance.

One part of the system appears to be underperforming

Some installations contain multiple strings or other configurations where a problem affecting part of the array may not completely shut down the system.

This can make faults harder to spot because the panels may still appear to be generating electricity.

Monitoring data and appropriate testing can help identify differences in performance.

Your solar monitoring app has stopped working

A monitoring problem does not necessarily mean that the solar panels themselves have failed.

The issue could involve the inverter’s communications equipment, network connection, monitoring gateway or online service.

A specialist can investigate whether the system is still generating electricity and establish why the monitoring information is unavailable.

Solar Panel Repairs After Storm Damage

Cornwall’s exposed coastal and rural locations mean that solar installations can be exposed to challenging weather conditions.

High winds, storms and flying debris can potentially damage panels, mounting equipment, cables or other parts of an installation.

If you believe your solar PV system has been damaged following severe weather, it is sensible to have it professionally inspected before assuming that it is safe to continue operating.

Visible damage to a panel does not necessarily reveal the full extent of the problem. A specialist can assess the installation and advise on the appropriate remedial work.

If the damage resulted from an insured event, you may also need documentation or an inspection report for your insurer.

Repairing Older Solar PV Systems

Cornwall has a substantial installed base of renewable-energy systems, and not every existing solar installation will still be supported by its original installer.

You may therefore need a solar PV repair specialist even if you did not originally use a local company.

Common situations include:

The original installer has stopped trading
The installer no longer services the area
The installation is several years old
The inverter manufacturer has discontinued the model
Monitoring equipment is obsolete
Replacement components are required
Documentation for the original installation is incomplete
The property has changed ownership

An experienced solar PV specialist may be able to diagnose and repair an existing system even when they were not responsible for the original installation.

Solar Panel Repairs and Maintenance

Repair and maintenance are closely related but are not the same thing.

Repair normally involves addressing a specific fault or failure.

Maintenance is intended to identify potential problems, monitor system performance and help keep the installation operating correctly.

For example, a solar PV maintenance visit might include checks of the inverter, electrical connections, monitoring system and other components, whereas a repair visit might be prompted by an inverter fault or damaged panel.

Regular monitoring can also help identify changes in performance before a complete failure occurs.

The UK’s previous investigation into PV system fires specifically identified maintenance practices such as checking DC isolators, connections and signs of overheating as areas where improved maintenance standards could help support safe operation.

You can find our dedicated local page here:

Solar PV Maintenance in Cornwall

Solar Panel Repairs for Homes in Cornwall

Domestic solar PV systems can develop faults for a number of reasons.

A homeowner might contact a repair specialist because:

Their electricity generation has unexpectedly fallen
Their inverter has stopped working
Their monitoring app is showing an error
Their panels have been damaged
Their system has stopped generating
They have received an inverter warning
They suspect an electrical fault
They have inherited an existing solar installation
They need an inspection before buying or selling a property

A specialist can assess the system and explain whether repair, replacement or further investigation is appropriate.

Commercial Solar Panel Repairs in Cornwall

Commercial solar installations can be particularly important to the businesses operating them because system downtime can reduce the amount of renewable electricity being generated on site.

Larger installations can also contain more complex combinations of panels, inverters, strings, monitoring systems and electrical equipment.

Businesses may therefore require specialist assistance with:

Commercial PV fault finding
Inverter problems
Reduced generation
String faults
Monitoring problems
Damaged panels
Electrical faults
Preventative maintenance
System inspections
Remedial works
Inverter replacement
Performance investigations

For larger systems, identifying the cause of a generation problem quickly can be particularly valuable.

See our dedicated page:

Commercial Solar Installers in Cornwall

Solar PV Repairs Throughout Cornwall

Solar panel repair companies may serve a much wider area than the town in which their business is based.

Depending on the company, solar PV repair services may be available across areas including:

Truro
Falmouth
Newquay
Penzance
St Austell
Redruth
Camborne
Hayle
Helston
Bodmin
Wadebridge
Padstow
Launceston
Liskeard
Bude
Camborne
Penryn
Callington
Saltash
Perranporth
St Ives

The right choice will depend on the location of the installation, the type of fault and whether the company is equipped to work on the particular system.

Cornwall Green Trades currently lists 73 MCS-verified businesses under Solar PV and 36 under Battery Storage, illustrating the depth of the local renewable-energy sector.

Choosing a Solar Panel Repair Company

When looking for someone to repair an existing solar PV system, it is worth asking a few questions before arranging the work.

Do they work on existing installations?

Not every solar installer specialises in repairing systems installed by somebody else.

If your original installer is no longer available, ask whether the company is willing to diagnose and repair an existing PV installation.

Do they have relevant solar PV experience?

Solar PV repairs are different from ordinary domestic electrical work.

Ask about the company’s experience with solar PV systems and, where relevant, the particular inverter or equipment installed at your property.

Can they diagnose the fault?

A good repair process should establish the cause of the problem rather than simply replacing the first component that appears faulty.

Are they appropriately certified?

For relevant installation and electrical work, check the company’s current qualifications, certifications and scope of work.

MCS standards specify requirements around competence, risk assessment, electrical requirements and, where applicable, notification procedures.

Can they provide documentation?

Depending on the work undertaken, you may need documentation for your records, insurer, mortgage provider or future property sale.

Ask what inspection, testing or certification documentation will be provided.

How Much Do Solar Panel Repairs Cost in Cornwall?

There is no single price for solar panel repairs because the cost depends heavily on the problem.

A straightforward diagnostic visit may be considerably less expensive than replacing an inverter, repairing damaged wiring or replacing several panels.

The eventual cost can depend on:

The type of fault
The size of the solar PV system
The age of the installation
The equipment manufacturer
Whether replacement parts are available
Whether access to the roof is required
Whether scaffolding or specialist access equipment is necessary
The complexity of the electrical fault
Whether the problem affects one panel, a string or the whole system

For this reason, obtaining a diagnosis and quotation from an experienced solar PV repair specialist is generally more useful than relying on a generic advertised repair price.

Do Solar Panels Need Repairs?

Solar panels themselves have relatively few moving parts, but a complete PV system contains numerous other components that can develop faults.

The panels, inverter, electrical connections, isolators, cabling, monitoring equipment and mounting system all form part of the overall installation.

A system can therefore require repair even when the panels themselves are physically undamaged.

Regular monitoring of generation can be one of the easiest ways for a homeowner or business to identify that something has changed.

Can a Solar Installer Repair Another Company’s Installation?

In many cases, yes.

However, this is something you should establish before booking an appointment.

Some installers concentrate primarily on new installations and may not offer repair or maintenance services for existing systems.

Others specialise specifically in servicing and repairing existing solar PV installations.

If the original installer has disappeared or is unable to help, look for a company that specifically advertises solar PV repairs, fault finding, servicing or maintenance.

What Should You Do If Your Solar Panels Stop Working?

If your solar PV system suddenly stops generating electricity:

Check the monitoring app or generation display.
Look at the inverter for warning messages or error codes.
Make a note of any fault code displayed.
Do not remove covers or attempt electrical repairs yourself.
Contact an appropriately qualified solar PV specialist.
Tell them the age and approximate size of the system if you know it.
Provide the inverter make and model where possible.
Explain when you first noticed the problem.

If there is visible physical damage, burning, overheating or another obvious safety concern, avoid interfering with the equipment and seek professional assistance.

Find Solar Panel Repair Specialists in Cornwall

Trusted Tradesman is building a growing directory of tradespeople and renewable-energy specialists across the UK.

If you need solar panel repairs in Cornwall, use the profiles on this site to find companies offering solar PV installation, maintenance, fault finding and related renewable-energy services.

Where available, individual profiles can provide information about the company’s services, locations covered, experience and contact details, helping you identify a suitable company for your particular requirements.

Related Solar Services in Cornwall

If your requirement is not specifically a repair, you may also be interested in:

These pages form part of the wider Trusted Tradesman solar hub, allowing homeowners and businesses to find relevant solar specialists according to the service they require.