The Role of Thermal Imaging in Solar Fire Prevention

As the energy demand grows, so does the size and complexity of solar energy systems. While some may say that the solar industry has taken a toll due to policy shifts and other factors, the long-term need for more energy sources continues to push demand for more utility-scale solar projects.

Photo by Day Electric

Utility-scale solar is the fastest-growing source of electricity generation in the United States, increasing from 290 BkWh in 2025 to 424 BkWh by 2027. Almost 70 gigawatts (GW) of new solar generating capacity projects are scheduled to come online in 2026 and 2027, which represents a 49% increase in U.S. solar operating capacity compared with the end of 2025. Source: eia

We are seeing larger utility-scale solar farms, spanning into hundreds of megawatts (MW) or more. Larger sites can mean more risk, more components, more equipment, and a higher need for these solar assets to be protected We are also seeing an increase in energy storage systems being integrated with solar, adding complexity and additional equipment that needs regular monitoring and maintenance.  As solar energy systems continue to expand across commercial, industrial, and utility-scale installations, ensuring their long-term safety has become just as important as maximizing energy production. There are not only millions of dollars on the line, in most cases, but also the safety of personnel, facilities, communities, and more.

How do we protect solar assets?

Most catastrophic incidents on solar sites, such as fires, are a result of either poor workmanship in the construction phase or lack of proactive maintenance. With that being said, one of the most effective technologies for preventing failures on solar energy systems is thermal imaging. By detecting heat anomalies before they become larger issues, thermal inspections help identify fire risks early, and protect valuable infrastructure and on-site personnel. Thermal imaging is a valuable tool that can and should be used during commissioning solar projects, as well as regularly for inspections and maintenance.

How thermal imaging helps prevent fires

Thermal imaging uses infrared cameras to measure surface temperature variations on across modules, electrical components, and equipment. A thermal camera assigns colors to different temperatures, making it easy to identify abnormal heat patterns. On a “healthy” solar system, all these components should operate within expected temperature ranges. However, when a component begins to fail, or is damaged, it often generates excess heat before other visible signs of damage appear. When damaged equipment or connections begin to create heat, this can lead to a fire risk. Fires on solar sites usually begin when an electrical fault creates excessive heat or an electrical arc ignites nearby combustible material.

Failed modules from suspected faulty Rapid Shutdown Devices (RSD) performed by Day Electric drone pilot. A faulty RSD can become a fire risk.

Performing regular thermal imaging of sites (either handheld or done) can detect abnormal heat signatures and pinpoint:

• Overheating connectors

• Loose electrical terminals

• Failing fuses

• Overloaded circuits

• Failed inverters

• Overheated junction boxes

• Hotspots on modules

• Failed bypass diodes

• Shading on modules – sometimes caused by overgrown vegetation which can cause module hotspots, as well as be a fire ignitor if an arc occurs

• And more…

Dirty modules causing module hot spots that can lead to fire risk if not addressed.

The majority of solar system fires can be traced back to preventable electrical issues. Routine inspections—especially using thermal imaging with drones or handheld cameras—combined with proper installation and other preventive maintenance are among the most effective ways to reduce fire risk.

Drone vs Handheld Thermal Imaging

Thermal imaging of solar sites can be performed using handheld thermal cameras, as well as by drones equipped with thermal cameras. They are both valuable tools, but have different uses and, in most cases, there are benefits of utilizing them both.

Drone-based thermal imaging allows for inspecting larger sites with efficiency, without the need for the technician to manually walk the site or be up-and-close to equipment. Handheld thermal imaging can be time-consuming for larger sites, but is great for further investigation, inspecting inside enclosures, and for sites where operating drones can be difficult (such as near airports). Best practice is to perform a drone inspection, and do further investigations with handheld thermal imaging.

In summary…

Pros of Drone-based Thermal Imaging Covers large solar sites quickly, without technicians needing to walk the site and open equipment Detects hot spots across thousands of panels Reduces inspection time and labor costs

Pros of Handheld Thermal Imaging Ideal for diagnosing specific components inside enclosures Well suited for small systems and follow-up inspections Useful for verifying repairs after corrections are made

What is at stake…

In most cases, system fires seem like the worst possible scenario, and they are. While not super common, when they do occur, the consequences can be significant. A single overheating component, when left unaddressed, can lead to:

• Equipment damage costing millions of dollars

• Extended operational downtime

• Insurance claims and liability concerns

• Safety risks for personnel and emergency responders

• Smoke and health risks for surrounding communities and personnel

• Fires spreading and causing damage beyond an isolated system

  
  

This is why early detection is crucial and cannot be overlooked. Proactive maintenance, such as performing routine thermal imaging and repair of faulty components, is not just best practice, but a necessity. Regular thermal inspections create a thermal performance history, making it easier to identify components that are gradually deteriorating before they fail. Comparing thermal data over time allows operators to prioritize repairs, extend equipment lifespan, and optimize maintenance budgets while improving overall system reliability.

Investing in routine thermal inspections is not just about finding problems—it's about preventing them before they have the chance to become costly or dangerous. As the solar industry continues to grow, too much is at risk, to defer proactive and corrective maintenance on commercial and utility solar sites.

About Day Electric

Day Electric is a solar service provider offering a variety of inspection, testing, repair, and maintenance services to support owners, operators, and developers with commercial and utility-sized solar projects. Day Electric performs both handheld and drone thermal imaging to pinpoint production and safety concerns for projects both under construction and in operation. To learn more about our Thermal Imaging services, reach out to Info@dayelectricusa.com today.