Understanding Thermal Imaging Inspections: The Ultimate Beginner’s Guide

Everything from solar farms to power lines requires frequent inspections to ensure everything works as intended. 

A faulty solar panel or array can significantly decrease power generation. That’s why inspections are a critical and central process.

Thermal imaging is one of the most important technologies behind solar farm inspections. Handheld or drone-mounted thermal cameras can detect the heat radiating from every cell of the solar farm’s PV panels. 

Too much or too little heat can indicate a component problem that will often escalate if left unchecked. That’s why thermal imaging inspections are essential for solar plants, and now, autonomous drone software can make these inspections efficient and valuable.

Interested in how thermal imaging works and its role in solar farms? Keep reading our beginner’s guide to help you understand the basics of thermal imaging and how it’s used to keep solar farms efficient.

What Is Thermal Imaging?

Thermal imaging is put to work in several industries to solve unique problems. This technology utilizes specialized cameras and sensors to detect objects’ heat signatures. 

Regarding solar farms, thermal imaging is like giving solar panels a health check using heat. Specialized equipment can identify heat, which you can’t see with the naked eye.

The goal of thermal imaging for solar plants is to capture heat differences to help identify the underlying cause. For example, a hotspot found with thermal imaging can mean a few different issues, each of which can reduce power generation and the panel’s lifespan and sometimes create a fire hazard.

Thermal imaging works by detecting infrared radiation, which is emitted as heat from objects. Solar panels typically produce heat uniformly across their surfaces when operating correctly. However, defects like damaged cells, faulty wiring, or dirt can disrupt this heat distribution, creating ‘hotspots’ or hotter-than-normal areas.

Drone-mounted thermal cameras capture these infrared heat patterns, converting them into visual data (thermograms). These images highlight anomalies invisible to the naked eye, such as a cell producing excess heat or a panel operating below normal temperatures. Paired with software, these thermograms can be analyzed to identify the root cause of inefficiencies, allowing maintenance teams to act quickly and precisely.

How Do Drones Come Into Play?

Drones and thermal imaging are two separate technologies that can be combined for significant benefits. With drones, solar farm inspections can be faster, more accurate, and much safer; however, drones aren’t strictly a requirement for thermal inspections.

Thermal imaging inspections can also be done with handheld devices and technicians walking from panel to panel. This method was standard practice before drones were an economical option. Manual inspections with handheld thermal cameras are no longer efficient or cost-effective.

Why Is Thermal Imaging a Big Deal for Solar Farms?

Solar farms need to make sure every component is operating as expected. Thermal imaging inspections allow for the rapid detection of faults affecting solar panels’ energy generation — which is critical for solar plants. 

A few reasons why thermal imaging is such a big deal for solar operators are:

• Find otherwise invisible problems: Thermal imaging is necessary to identify underperforming, faulty, or damaged panels. These issues are hard to detect without thermal imaging yet can severely reduce power generation for the entire solar plant.
• Catches issues before they escalate: Inspections prevent small issues from turning into major, expensive ones, and thermal imaging is a core technology that enables effective inspections. 
• Unlocks faster and safer inspections: Legacy inspection methods were time-intensive and hazardous to technicians. Combined with drones, thermal inspections make these critical processes quicker and have a much lower risk of injury. 

Did you know that a single faulty panel in a string can significantly reduce energy output? In series configurations, the performance of the entire string is influenced by the weakest panel. Therefore, a malfunctioning panel can diminish the efficiency of the whole system. 

Regular thermal imaging inspections are essential for promptly identifying such issues and their causes, estimating their power loss effect, and prioritizing their repair work to ensure the panels operate optimally and contribute effectively to the system’s performance.

How Thermal Imaging Works in Solar Inspections

Thermal imaging is found in various industries, from firefighting to structural inspections. How exactly does thermal imaging work in the context of solar inspections? Let’s break down the overall workflow for how drones equipped with the right sensors conduct solar plant inspections:

1. Autonomous drone flights: The process begins with drones flying over the entire solar plant and taking thermal images based on a programmed route. Autonomous drones remove the need for manual piloting and enable consistent high-quality of captured data.
2. Capture thermal and optical data: Drones have cameras that can capture both thermal and visual (RGB) images. These images provide the raw data for identifying and highlighting faults.
3. Generate inspection analytics and reports to guide repairs: Inspection analytics software analyzes the imaging data, detects the faults, and displays their type, exact location, and power loss effect.  This detailed information helps solar farm owners and their O&M teams make data-driven decisions about prioritizing and addressing faults.

Real Benefits of Thermal Imaging

What are the practical benefits of thermal imaging for solar panels? We’ve touched on some benefits already, but let’s drill down into the business benefits solar operators can expect.

1. Identify Problems Now, Not Later

Some of the issues detected by thermal imaging might already be severe, but you’ll find minor faults that may go unnoticed in many cases. You’ll be able to catch problems early before they hurt power output or cause equipment failure.

Once found, maintenance teams can schedule repairs to prevent issues from escalating and creating major issues, ranging from unplanned downtime to replacing panels or other components.

2. Highly Efficient

Drone-based thermal inspections can save significant time compared to manual inspections. Autonomous drones are faster and more cost-efficient than requiring expert inspectors to walk from panel to panel with a handheld sensor.

With autonomous drones, technicians simply need to initiate the process, and drones will fly through an optimal route to conduct inspections. Thermal cameras capture heat data, while optical cameras shed light on each component’s physical condition and environment. In large utility-scale solar farms, an autonomous multi-drone inspection can significantly reduce the time and cost of a thermal inspection. 

3. Accuracy and Consistency

Inspections must be accurate; otherwise, they’re not even worth the time and effort. Thermal and optical inspection data needs to fully represent the present condition of components so technicians can prioritize repairs.

Additionally, inspection data should be consistent and captured the same way every time. Autonomous drones can sidestep the slightest deviations accompanying manual piloting or legacy methods.

4. Safety

Manual inspections of solar panels require inspectors with handheld thermal imaging tools to walk along platforms to perform inspections. When they were the only option, the hazards of conducting inspections this way were necessary.

However, there’s no longer a need for climbing close to live panels and walking along narrow spaces between panel arrays. Technicians can now stay safe on the ground while drones carry out inspections. You’ll greatly minimize workplace accidents and the risks that accompany solar inspections.

Practical Examples of Thermal Imaging Inspections

How might thermal imaging look in practice? A few key examples of thermal imaging inspections are:

• Imagine a solar farm notices a significant drop in power output of a specific inverter. A quick thermal scan finds several panels overheating due to damaged wiring. Rapid inspections allow for a problem to be spotted and then quickly solved.
• Thermal imaging can identify faulty connections, loose wiring, and malfunctioning bypass diodes within a solar panel array. Correcting these issues makes sure panels are operational and can even prevent fires.
• Physical and environmental issues such as shading, soiling, and vegetation are also detected by thermal inspections, allowing O&M teams to optimize a tracker’s position, cleaning panels, and plant mowing.   
• Inspections that leverage thermal imaging can identify any inconsistencies in temperature across a solar array. Temperatures should only have minor deviations, so detected anomalies can help repair faults.

How vHive Makes It Even Better

Thermal imaging on its own is a valuable asset for solar plants. At vHive, we take these benefits even further by providing an end-to-end solar farm inspection and analytics solution that combines the most efficient data capture and immediate AI-driven insights that help utility solar farms stay efficient and optimize their power production.

Leverage Thermal Imaging and Drones for Cost-Effective Inspections

Thermal imaging is the go-to tool for spotting and fixing solar farm issues, and now it’s easier than ever to keep your solar farm running smoothly with modern technologies. Solar farms can cut inspection costs and ensure optimal energy generation when combined with autonomous drones and AI-driven analytics.

vHive is an industry-leading provider of automated solutions for infrastructure inspections. We’ve focused on developing a well-rounded, purpose-built solution for solar farms, from new solar farms to established utility-scale operators.

Are you curious to see how thermal imaging can benefit your solar farm? Book a demo with vHive to learn how we can help.