Solar panels and lightning: how to protect your PV system

Do solar panels attract lightning? Can a thunderstorm damage your inverter? Does every rooftop solar installation need a lightning protection system?

A solar photovoltaic (PV) system does not automatically attract lightning, but it can be damaged by a direct strike or by electrical surges caused by lightning nearby. Reducing that risk requires protection suited to the building and the installation.

There is no single solution: external lightning protection, earthing and surge protective devices perform different functions. Understanding these differences helps you know what protection to discuss with your installer and what checks to request after a storm.

Do solar panels attract lightning?

No. Solar panels do not attract lightning simply because they generate electricity or contain metal parts. The likelihood of a structure being struck depends on factors such as its height, shape, position relative to surrounding buildings and local lightning activity.

Installing rooftop solar panels does not therefore automatically mean a significant increase in lightning risk. However, the design must account for any changes the panels and mounting structures make to the roof’s geometry, and how they interact with any existing lightning protection system.

Panels mounted flush with a pitched roof present different conditions from an elevated array on an isolated structure. The assessment must reflect the actual installation rather than assumptions such as “lightning always strikes the highest point”.

There are also two separate issues to consider: the likelihood of the building being struck and the effects of lightning on its electrical equipment. A strike does not have to hit the roof to damage the PV system.

What happens if lightning strikes a solar installation?

The damage depends on the point of impact, the path taken by the current and the protection in place. The main distinction is between direct strikes and indirect effects.

Direct strikes: damage to panels and structures

A strike to the installation or building can cause thermal, mechanical and electrical damage. Possible consequences include shattered glass, burn marks and damage to junction boxes, cables and mounting structures.

This does not mean that every strike destroys the entire system. However, a direct strike requires a thorough inspection before the installation is brought back into service, even if visible damage appears limited.

Nearby strikes: electrical surges and electronic faults

Lightning can cause electrical surges through electromagnetic induction and connected electrical lines. These effects can reach the direct current (DC) circuits between the panels and inverter, the alternating current (AC) circuits and communication lines.

If a surge exceeds the levels that components can withstand, it may cause an immediate failure or damage that becomes apparent later.

Protection therefore needs to cover the whole electrical system, not just the panels.

Which components can be damaged during a thunderstorm?

A PV installation includes panels, an inverter, wiring and protective devices. It may also include batteries, monitoring equipment and energy management devices. Lightning can affect one or more of these components.

Solar panels may suffer cracks, burns or damage to insulation and connections. In the inverter, surges can cause electronic faults, alarms and shutdowns. Cables, connectors and components inside distribution boards can also be damaged. If the installation includes battery storage, its control electronics and power interfaces may be affected. Monitoring and communication equipment may stop transmitting data or malfunction.

A drop in generation or an inverter shutdown after a storm does not, on its own, prove lightning damage. Cloud cover, grid outages and connectivity problems can cause similar symptoms. Identifying the cause requires an assessment of the alarms and the installation.

Not all panel damage is visible. Insulation faults or damaged connections may require specific tests. Cell microcracks should not automatically be attributed to lightning either, as they can have other causes.

Can lightning cause a fire?

A direct strike or a resulting fault can cause overheating and electrical arcing. The risk depends on the installation’s condition, the materials used and the protection provided.

Good design, suitable components and maintenance help reduce the risk of fire in PV systems.

If you notice smoke, sparks or a burning smell, keep your distance and contact the emergency services. Switching off the inverter does not necessarily make every circuit safe: panels exposed to daylight can continue to generate electricity.

How to protect solar panels and PV systems from lightning

Effective protection combines several coordinated measures. The starting point is an assessment of the building, connected lines, panel layout and any existing lightning protection system.

This allows a qualified professional to determine which measures are needed and how they should work together. No single device eliminates the risk completely.

External lightning protection: managing direct strikes

An external lightning protection system is designed to intercept a strike and conduct its current to earth along dedicated paths.

It includes air-termination components, such as lightning rods, down conductors and an earth-termination system. It does not stop lightning from forming and does not replace surge protection.

If the building already has external lightning protection, the PV installation must be coordinated with it. Panel positioning, separation distances and any required bonding must be checked. Simply keeping the panels from physically touching the conductors is not enough.

Surge protective devices: protecting electrical circuits

Surge protective devices, or SPDs, limit transient overvoltages and help protect inverters and other electrical equipment.

A PV installation needs an assessment of both the DC side, between the panels and inverter, and the AC side. Devices must be suitable for their respective circuits and coordinated with other protective measures.

Selection depends on the system layout and the electrical stresses expected. Type 1 and Type 2 SPDs have different characteristics: the designer must determine the appropriate type and location.

Installation also matters: effective surge protection for PV systems depends on selecting and connecting SPDs correctly. Excessively long connections or unsuitable arrangements can reduce their effectiveness.

Earthing and equipotential bonding

Earthing is essential for electrical safety, but it cannot protect a PV system against lightning on its own.

Equipotential bonding helps limit dangerous voltage differences between conductive parts. It must follow the design and be coordinated with the other protective measures.

Adding an earth electrode without assessing the installation as a whole is not a universal solution.

Design and maintenance

Cable routing, inverter location and distribution board layout all influence protection. The design also considers the arrangement of conductors and the reduction of circuit loop areas in which lightning can induce voltages.

Protective devices and connections need checks over time. Some SPDs have indicators showing when they have reached the end of their service life or need replacement. Inspection methods and intervals depend on the design, applicable requirements and manufacturers’ instructions.

Does every home solar installation need lightning protection?

Installing solar panels does not, by itself, mean that every home needs an external lightning protection system. The requirement depends on the risk assessment and the rules applicable to the building and country concerned.

This does not mean that surge protection can be ignored when external lightning protection is unnecessary. Protection of the electrical circuits must still be assessed for the installation.

Across Europe, relevant technical references include the EN IEC 62305 series for lightning protection and risk assessment, and the HD 60364 series for low-voltage electrical installations, including Part 7-712 for PV systems.

These references must be considered alongside national regulations, national implementations of the standards and any local requirements. The designer must check the applicable editions, amendments and transition periods with the relevant national standards body. A newly published international standard does not automatically mean that the same edition is already applicable in every European country.

Keep the system design, technical documentation, commissioning records, any required compliance certificates and operating instructions. These are also important when replacing an inverter, adding a battery or extending the array, as such changes may require the existing protection to be reassessed.

What to do if your solar system stops working after a storm

An issue after a thunderstorm deserves attention, but its timing does not establish the cause. The aim is to gather useful information without putting yourself at risk.

Check monitoring data and record alarms

Using your usual app or monitoring system, check for error codes, interruptions in generation or missing data. Note the date and time of the issue and save any relevant screenshots.

Consider the weather, grid availability and internet connection too. Missing app data does not necessarily mean the system has stopped generating, while cloud cover may explain reduced output.

If the problem persists or alarms appear, contact your installer or technical support provider.

Avoid working on electrical components

Do not climb onto the roof, open distribution boards or inverters, or handle connectors and cables. If you suspect electrical damage, avoid repeated attempts to restart the system.

Shutdown and restart procedures vary with the model and system configuration. Follow the instructions provided and seek assistance if you cannot operate the equipment safely.

Arrange a professional inspection when needed

If you suspect a strike has affected the building or installation, a qualified professional can check:

• the condition of panels, cables and connectors;

• SPDs and other protective devices;

• inverter alarms and operation;

• insulation and continuity of connections, using appropriate tests.

The extent of the inspection depends on the event and symptoms. The system should only be returned to service once hazards have been ruled out and faults resolved.

Does insurance cover lightning damage to solar panels?

It depends on the policy. Some home insurance policies include PV installations; others require specific cover. Check both the insured equipment and the definitions of the events covered.

Pay particular attention to:

• Direct damage and electrical surges: the policy may distinguish a lightning strike from faults caused by surges.

• Included components: panels, inverters, mounting structures and batteries may be subject to different terms.

• Excesses, limits and exclusions: these determine how much of the loss may be covered.

• Lost generation: cover for the financial effects of system downtime is not automatically included.

For a possible claim, follow the reporting procedure and deadlines in your policy. Keep photographs taken from safe locations, monitoring records and the technician’s report. Before disposing of damaged components, check whether the insurer needs to inspect them.

Gathering evidence must never delay action needed to address an immediate danger.

Frequently asked questions about solar panels and lightning

Should I switch off my solar system during a thunderstorm?

There is no universal requirement to switch every PV system off manually. Follow the manufacturer’s and designer’s instructions. Do not approach exposed equipment or carry out dangerous electrical operations while a storm is in progress.

Can lightning damage an inverter without striking the panels?

Yes. Surges can reach the inverter through electrical connections or be induced by nearby strikes. Protection must therefore account for indirect effects too.

Does external lightning protection replace SPDs?

No. External protection intercepts lightning and conducts its current to earth, while SPDs limit certain overvoltages in electrical circuits. Their functions differ and must be coordinated as part of the design.

Do SPDs protect against every lightning strike?

No. They operate within their rated capabilities and do not provide absolute protection. Their effectiveness depends on selection, connections and coordination with other measures.

How much does it cost to repair a lightning-damaged PV system?

It depends on the components affected and the work required. Replacing a protective device has a different cost from replacing an inverter or several panels. A reliable quotation requires a technical diagnosis.

Protecting your solar installation preserves its value

PV systems are designed to operate outdoors, but lightning protection needs to be assessed as part of the complete installation.

Good design, suitable protective devices and maintenance help reduce risk and maintain generation. If you already have a system, ask your installer which protections are in place and what inspections are needed, especially before adding batteries or changing the layout.