Thermal Drone Inspections in Solar Farms: Precision and Return

Solar farms are long-term investments, the profitability of which directly depends on system performance and longevity. To ensure maximum electricity generation and minimise losses, regular and precise system diagnostics are essential. Traditional inspections, based on visual assessment or individual panel measurements, are time-consuming and may not always identify all hidden defects.

The scale and complexity of modern solar farms demand more efficient and automated approaches to diagnostics. In this context, thermal drone inspections have become an indispensable tool, enabling rapid and accurate assessment of the health of large solar farms.

Thermal drone inspections utilise unmanned aerial vehicles (drones) equipped with high-resolution thermal cameras. These cameras detect infrared radiation, visualising the surface temperature distribution of solar panels. Defective cells or panels typically heat up more than functional parts, creating thermal anomalies (so-called "hot spots") that can be easily identified in thermographic images.

Key advantages include: rapid inspection of large areas, even in hard-to-reach locations; early detection of defects before they cause significant power losses or safety risks; precise localisation of defects, facilitating repair work; as well as reduced labour costs and risks to personnel. Drone inspections can be carried out efficiently, with minimal disruption to farm operations.

Thermal drone inspections can identify a wide range of defects affecting solar panel performance and safety. These include: damaged cells (e.g., cracks, microcracks), open-circuit defects (broken cells), bypass diode failures, laminate delamination, PID effect (Potential Induced Degradation), as well as inherent defects arising during the manufacturing process or transportation.

These defects not only reduce panel efficiency and overall electricity generation but can also pose safety risks, such as the potential for fire due to "hot spots". Regular thermographic inspections help to promptly address these issues, thereby extending the lifespan of panels and maintaining the farm's profitability.

After drone flights, the acquired thermal and optical images are processed using specialised software. This software automatically identifies anomalies and generates a detailed report. In the case of pvcare.eu, this data is compiled into an interactive report on the dronepv.eu platform, providing clients with easily understandable visual information about the condition of each panel.

The report includes: precise defect mapping with GPS coordinates, classification of defect types, visual and thermal images of each detected "hot spot", and recommendations for further actions. Such detailed information allows solar farm owners and managers to make informed decisions regarding repairs, maintenance, or submitting warranty claims.

Thermal drone inspections are recommended to be performed regularly. For newly built farms, an initial inspection is critical to identify manufacturing or installation defects. Subsequently, inspections should be carried out at least once a year, preferably in spring or autumn, when solar irradiance is optimal for detecting thermal anomalies and temperature contrasts are sufficiently pronounced.

To achieve optimal results, thermal drone inspections should be integrated into a broader O&M (Operation & Maintenance) strategy, combining them with other maintenance activities such as robotic panel cleaning, grounds maintenance, and electrical component checks in accordance with the LVS EN IEC 62446-2:2020 standard. Such a holistic approach ensures a comprehensive assessment of farm health and maximises return on investment.