Can Solar Panels Catch Fire? Causes, Risks and Prevention

As solar energy adoption accelerates across the UK, property owners increasingly ask: Can solar panels catch fire? While photovoltaic (PV) panels themselves rarely ignite, electrical components within the system can pose minor risks under certain conditions.

In fact, a UK solar installation carries an exceptionally low fire probability of just 0.0046%, with most issues stemming from faulty wiring or improper installation rather than the panels.

This guide will delve into the root causes of fires in photovoltaic panels, key early warning signs, and practical prevention strategies.

Can Solar Panels Catch Fire?

Yes, solar panels may cause fires, although this is rare, and the panels are nearly never to blame. There isn't much clear data available on the incidence of fire breakouts with PV panels. While there are more instances of solar panel fires now than there were 20 years ago, this is due to the fact that the number of houses going solar has increased dramatically.

What Is the Likelihood of Solar Panels Causing a Fire?

A solar panel system in the UK, whether domestic or utility-scale, has a 0.0061% probability of catching fire. (Source: Sunsave)

Furthermore, there is only a 0.0046% risk that a solar panel installation will cause a fire. According to UK government data, the majority of solar PV fires begin on the direct current (DC) side of the system, most commonly at isolators and connections, and improper installation is the single leading cause.

Real-Life Examples of Solar Panel Fires in the UK

Although the overall danger is modest, numerous significant fire accidents caused by PV system flaws have happened in the UK in recent years, raising concerns among the public and facility management authorities:

• Fire at Malton Hospital, North Yorkshire: The Springwood ward building at Malton Hospital in North Yorkshire, which provided mental health services for the elderly, was destroyed by a major fire. Investigations by the local fire and rescue service and the NHS Foundation Trust confirmed that the fire most likely originated from roof-mounted solar panels (fortunately, all 15 inpatients were safely evacuated, and there were no casualties).
• Evacuation at a Bristol Maternity Hospital: Avon Fire and Rescue Service subsequently stated that the fire that prompted the hospital's evacuation was unintentional and caused by a failure in the rooftop solar panels.

How Do Solar Panel Fires Actually Happen?

Solar fires do not ignite when sunlight strikes a panel. They start when anything in the electrical system breaks. And practically every failure can be traced back to a specific reason. Here are the five primary causes of solar panel fires:

Improper Construction and Installation

Installation quality concerns are the leading cause of fires. These include loose connections caused by incorrectly tightened wiring, poor junction box assembly, faulty grounding, and inaccurate cable and component dimensions or specification. Loose connections cause electrical resistance and generate high temperatures; sustained heating can melt insulation and burn surrounding combustibles.

DC AC Faults

When high-voltage direct current (DC) passes through gaps produced by faulty wire, corroded terminals, or incorrectly seated connections, the current can leap over the air gap, resulting in a "arc." This rapidly creates temperatures that exceed thousands of degrees Celsius.

Unlike alternating current (AC), direct current (DC) runs in a continuous direction; once an arc is formed, it is exceedingly difficult to extinguish on its own and can quickly ignite nearby things.

Inverter Malfunctions and Overload

The inverter is the basic component that converts direct current (DC) to alternating current (AC). Internal component damage can easily result in short circuits and fires if an inverter has manufacturing faults, overheats due to insufficient ventilation, or is subjected to over-voltage and grid power surges.

Low-Quality or Uncertified Components

The use of inferior parts, such as counterfeit connections or low-quality microinverters, that do not have safety certificates. These low-cost components frequently have inadequate heat resistance and insulation, rendering them prone to electrical failures during extended, high-load use.

Ageing Systems and Physical Damage

Panels are intended to endure 25 to 30 years. However, wire and connections can deteriorate more quickly, particularly in locations with large temperature changes or high UV exposure. A 10-year-old system that has never been physically inspected is exhibiting unknown electrical conditions. Rodent damage occurs more frequently than most people realise. Squirrels and starlings nest under panel arrays and gnaw wires.

Do Solar Panels Pose a Fire Risk?

Although the overall chance is extremely low, solar photovoltaic (PV) systems do pose certain fire dangers. PV systems often show clear warning indicators before a fire starts. If any of the following visual, auditory, performance, or system alarm irregularities are observed, call a certified professional engineer right once to investigate.

Signal 1: Brown Discoloration or Hot Spots on the Panel Surface

Localised discolouration, brown spots, or burn marks on a PV module's surface are typically indicative of the "hot spot effect." Shaded or damaged cells switch from power generators to resistors, resulting in significant localised heating.

Signal 2: Damaged or Significantly Aged Cable Insulation

Visible damage, cracking, or extreme ageing of the cable wrapping may expose interior conductors, potentially resulting in short circuits or ground failures.

Signal 3: Deformation or Cracking of the Module Surface

Physical deformation of the PV panel, backsheet cracking, or sealant delamination allow rainfall and moisture to enter the internal electrical structure, speeding up corrosion and potentially triggering an electrical failure.

Signal 4: Pungent Smell of Burning Plastic

Detecting a strong odour of burnt rubber or plastic near the inverter or DC isolator housing is a clear sign that insulation is melting due to heat.

Signal 5: Hissing, Buzzing, or Crackling Sounds

Hearing noticeable hissing (arcing sounds), cracking, or persistent odd noises from the DC distribution box or switchgear is frequently indicative of DC electrical arcing. This is one of the most hazardous signs of an impending fire.

Signal 6: Sudden or Unexplained Significant Drop in Power Output

A sudden, unexpected, and rapid drop in power production from a whole string or a single panel, despite favourable weather circumstances, sometimes suggests that internal circuit failures, short circuits, or extreme hot spots are impeding current passage.

Sign 7: Unresolved Inverter Error Codes

Don't disregard persistent fault codes on the inverter's display or frequent automatic shutdowns caused by protective devices. Forcing a system to run while faults exist greatly raises the danger of electrical overheating.

Why Commercial Solar Carries Higher Stakes?

Compared to the small-scale photovoltaic (PV) systems typically found on residential rooftops, large-scale, and even megawatt-peak (MWp) class, solar systems installed on commercial buildings (such as factories, warehouses, hospitals, schools, or logistics centers) present vastly different safety challenges.

Should a commercial solar system fail, the resulting fire risks and secondary disasters are far more severe. The core reasons are as follows:

Complex Structure with Numerous Hidden Failure Points

Commercial photovoltaic (PV) systems are large-scale installations comprising vast numbers of string cables, plug connectors, combiner boxes, and disconnect switches. Every connection point represents a potential failure point; the greater the number of connections, the higher the probability of DC arcing caused by loose contacts, corrosion, or installation defects.

Highly Flammable Roofing Materials

Many large commercial warehouses and industrial facilities utilise composite roofing structures that incorporate flammable insulation materials or polymer waterproofing membranes. Should PV components generate excessive heat or produce an arc, the roofing substrate can easily ignite, causing a localized fire to rapidly escalate into a massive blaze engulfing the entire building.

Severe Losses from Business Interruption

For commercial facilities, the consequences of a fire extend far beyond damage to a few solar panels. The resulting operational downtime and safety risks far outweigh the value of the PV equipment itself. For instance, a fire at a hospital could cripple critical care wards and endanger patients' lives, while a fire at a school could lead to closures and major safety incidents.

Extreme Challenges for Emergency Response

Although inverters automatically shut down the AC side during a grid outage, the DC circuits, extending from the PV panels to the DC disconnect switch, remain energized as long as sunlight is present. If fire damages the cable insulation, exposed high-voltage DC conductors pose a lethal electrocution risk to firefighters, significantly complicating firefighting and rescue operations.

How to Prevent Solar Panel Fires?

While the danger of fire in solar panels is extremely minimal, the great majority of possible hazards may be totally addressed using standardised preventative measures. The top six key measures for avoiding solar panel fires are listed below:

Choosing Experienced Solar Panel Installers

Having your solar panels installed by a fully qualified, licensed, and MCS-certified technician can save you a lot of difficulties in the long run.Never attempt to install solar panels yourself; you may save money, but it is not safe and increases the risk of a solar panel fire.

Invest in Quality Solar Panels

Just as you should not cut corners while installing panels, do not choose the cheapest choice when purchasing the panels themselves. Cheaper panels may malfunction and cause a fire, resulting in increased financial losses in the long term.Always choose the somewhat more costly model, since they will function better in the long run and be less prone to failure or risk.

Use Non-Combustible Insulation

It's a good idea to use anti-inflammable panel points, as well as non-combustible insulation like mineral wool. If you do, any fire that starts will not be able to spread farther.Combustible materials, such as polystyrene insulation, should be avoided at any cost.

Keep Panels and the Area Around Them Clean

Debris under panels, such as leaves, pine needles, and bird nesting materials, serve as both a source of fire fuel and a home for pests. After a hailstorm, significant storm or roofing work, check visible panels for cracks before the next sunny day.

Implement Regular Maintenance

Check for loose connections, broken wires, and evidence of wear. Always have a professional evaluate the roof—never attempt to climb atop it yourself. Consider scheduling a professional thermal imaging assessment every 5-7 years to identify hotspots before they become problematic.

Consider Taking Measures to Help the Fire Brigade

Clearly mark electrical characteristics and hazard alerts in the system so that emergency responders can find them during an event. Consider installing an easy-to-use emergency quick shutdown switch (also known as a "Fireman Switch"), which enables for the remote, external cutoff of DC power from rooftop PV panels during an emergency, assuring the safety of firefighting operations.

Should You Switch Your Solar Panels Off?

You should not shut them down blindly. While shutting down the entire photovoltaic (PV) system is often the first reaction when facing safety concerns, it is rarely the right course of action in the long run. Turning a system off removes generation, removes savings, removes carbon benefit, and does not fix an underlying defect.

How Should One Respond Correctly?

The proportionate response is an inspection-led one:

• Commission a thermographic and electrical inspection of the array, isolators, connectors and inverters.
• Check whether external DC isolators are present, what condition they are in, and whether they are correctly rated and weatherproofed.
• Review commissioning records and any service history.
• Remediate what is found, then return the system to service under a maintenance regime.

If a Shutdown Is Required, How Should It Be Done?

In the event of a sudden emergency (such as a building fire) or a critical fault requiring a system halt, perform a safe shutdown by strictly following this sequence:

Step 1: First, flip the AC isolator switch located next to the inverter or the dedicated PV AC circuit breaker in the distribution box. This step safely disconnects the inverter from both the building's electrical system and the public grid.

Step 2: After cutting off the AC side, manually turn off the DC isolator switches (either built into the inverter or installed along the line).

Safety Warning: Never disconnect any DC connectors while exposed to daylight; solar panels continuously generate high-voltage DC electricity whenever they receive light. In extreme situations like a fire, notify the fire department immediately.

Jackery SolarVault 3 Pro Max - Prevent Fire Risks

To fundamentally mitigate the electrical risks associated with high-voltage DC lines and achieve safer, more convenient system management, the best solution is to choose PV products or energy storage equipment featuring intelligent safety designs.

For instance, adopting a high-safety energy storage unit like the Jackery SolarVault 3 Pro Max can significantly enhance the efficiency of daily PV system management and the ability to respond to emergencies.

Supports Remote Intelligent Shutdown via a Jackery Ark AI EMS 2.0: The Jackery SolarVault 3 Pro Max features deep integration with a smart mobile app. Users can monitor system voltage, current, and operating temperatures in real-time.

Furthermore, in the event of an anomaly or emergency, they can quickly shut down or isolate system inputs and outputs with a single tap on the Jackery App, eliminating the need to manually operate high-voltage switches and the associated risks.

4 Independent MPPT Channels Reduce the Risk of Localized Hot Spots: With four built-in independent MPPT controllers (supporting up to 4,000W of solar input), the system not only optimises power generation efficiency for panels facing different directions but also enables segmented isolation and balanced management of DC inputs from each string. This addresses the root causes of localized overheating and arc faults resulting from current mismatches.

Thermally Stable LiFePO4 Cells and Intelligent BMS: The system utilises high-safety-grade Lithium Iron Phosphate (LiFePO4) cells paired with a high-precision Battery Management System (BMS). It boasts a lifespan of over 6,000 charge-discharge cycles and is highly resistant to thermal runaway.

High Weather Resistance and Rapid Switching: It features an IP65 dustproof and waterproof rating, preventing moisture ingress that could cause ground faults. Additionally, it provides seamless switching within milliseconds (<20ms) during sudden power outages, ensuring continuous power to critical loads while protecting against surge overloads.

The Future of Solar Panel Fire Safety

The future of fire safety in solar energy is shifting toward prevention much earlier in the process. Instead of waiting for flaws to become noticeable problems, improved technologies are meant to detect dangers earlier and prevent minor failures from escalating into large fire catastrophes. Fire safety in solar is becoming an integral element of the system design, rather than being added after installation.

Solar panel fire safety is constantly improving thanks to technological advancements. Modern systems have additional safety measures such as:

• Automatic shutdown capabilities during failures.
• Advanced arc fault detection.
• Power electronics at the module level isolate issues.

The Role of AI and Smart Monitoring in Fire Prevention Is Becoming Increasingly Critical

Manual periodic inspections only reflect conditions at a specific moment in time, whereas faults often occur during the intervals between inspections. AI-driven predictive maintenance and real-time smart monitoring are replacing passive routine checks to become standard safety features.

Smart systems continuously track temperature, voltage fluctuations, and equipment behavior 24/7, identifying subtle anomaly patterns that signal early-stage hazards. AI-based data analysis can precisely distinguish between normal heat generation (such as that caused by dust accumulation or thermal effects) and genuine risks associated with poor electrical contact, thereby avoiding false alarms.

Example: The Jackery SolarVault 3 Pro Max, for instance, deeply integrates AI-driven intelligent monitoring with proactive safety management. It features a built-in, high-precision BMS monitoring system that tracks battery status, voltage balance, and temperature fluctuations in real-time, providing early warnings.

Coupled with a dedicated app for remote control, users and O&M personnel can monitor operational status at any time and rapidly execute remote shutdowns and isolation should any anomalies occur.

FAQs

The following are the frequently asked questions about the solar panels fire danger:

Are solar panels a fire risk?

Solar panels, like any electrical system, provide a fire danger, but such events are exceedingly rare. A solar panel system in the UK has a 0.0061% probability of catching fire. And the identical solar panel system has a 0.0046% risk of starting a fire.

Why are people getting rid of their solar panels?

Rest assured, it is not because solar panels catch fire; instead, homeowners often remove them for reasons such as needed roof repairs, ageing or malfunctioning equipment, disappointing energy savings, or property sale.

What can cause a solar panel to catch fire?

According to research conducted by the BRE National Solar Center and the University of Edinburgh, incorrect installation is the leading cause of solar panel fires. This can result in faulty wiring and weak connections, causing minor breaks in the circuit and eventually triggering a phenomena known as 'electrical arcing'.

How many solar panel fires per year?

In 2025, there were 102 home fires with solar panels, 48 in commercial buildings, 14 in industrial buildings, and 14 on solar farms. (Source: Construction Management)

Can solar panels catch fire in extreme heat?

Extreme ambient heat alone does not start flames. It can exacerbate damage in already decaying components, but it can not ignite a working system.

Are solar panels safe?

Solar panels are quite safe. All electrical goods carry some danger, but modern solar arrays utilise far more dependable technology than in the past, including safer DC isolators. The MCS and Flexi-Orb both need rigorous requirements from installers.

Are solar panels a fire risk compared to other home systems?

No, when put appropriately, solar systems have a lower danger of fire than most other residential electrical systems. The vast majority of house electrical fires are caused by your main electrical panel, HVAC system, dryer, and kitchen appliances together.

What are the specific hazards posed by PV systems to firefighters during a fire?

PV systems can provide a number of concerns during firefighting operations, including the potential of electrical shock from live system components, particularly when electrical current flows through water.

Mechanical and thermal stress on PV module glass poses a concern to firefighters. These dangers can be reduced by using appropriate protective equipment and according to safety regulations for safe distances from electrical components and extinguishing techniques.

Conclusion

Fire hazards almost always trace back to installation flaws, aging wiring, or component failure rather than the panels themselves. Rather than shutting down systems blindly, the safest approach involves regular inspections, qualified MCS installers, and strict maintenance regimes. As technology advances, fire safety is seamlessly integrating into modern PV designs through AI monitoring, rapid shutdown features, and safer component choices.

Advanced energy storage systems like the Jackery SolarVault 3 Pro Max lead this shift, combining app-controlled emergency isolation with robust LiFePO4 chemistry to guarantee uncompromised safety.