Evaluating the condition of photovoltaic installations through aerial inspection with UAVs has become a standard and constantly evolving technique. The use of thermal sensors, combined with a systematic flight methodology, enables the capture of critical information about the thermal behavior of panels, often linked to internal faults or reduced energy performance.
Data Collection: Key Technical Parameters
To obtain reliable thermal data from PV systems, consistency is required among equipment, environmental conditions, and flight settings. The recommended approach includes:
- Flight altitude: Around 25 meters, achieving adequate image resolution without loss of clarity. Ideally, a Ground Sampling Distance of 3–5 cm is targeted so that individual cells within panels are clearly distinguishable.
- Camera angle: 90° (nadir view), ensuring geometric uniformity and minimizing distortions.
- Constant flight speed, adjusted to the sensor’s capabilities and the thermal focus requirements.
- Mapping-type flight plan, covering the entire field with overlapping flight paths.
Data should be collected under appropriate environmental conditions, prioritizing periods when the thermal contrast between operating and non-operating panels is sufficient (typically during early morning, midday, or late afternoon, depending on the inspection’s purpose).
Reference Points: Standards and Approaches
Thermal inspection of PV systems using UAVs is not an arbitrary process. Recognized technical standards, such as IEC 62446-3:2017, define general requirements for the interpretation of thermal imagery and acquisition conditions.
The use of certified sensors, proper detection thresholds for thermal variations, and documented temperature and range limits is recommended. False readings due to solar reflections, poor viewing angles, or shading are mitigated through the right combination of equipment, methodology, and operator experience.
From Data Capture to Evaluation
Inspection quality ultimately depends on the ability to turn thermal data into actionable insights. This involves:
- Georeferencing of thermal images,
- Detection of anomalies using appropriate thresholds and image processing techniques,
- Logging recurring points of interest,
- Correlation with operational data and technical specifications of the installation,
- and technical understanding of the thermal behavior of materials and systems under load.
Field Insights (Based on Documented Knowledge and our Experience)
In practice, even under optimal parameters and conditions, thermal deviations in PV panels are not always related to electrical faults. Many observed temperature differences arise from seemingly unrelated factors such as dirt (e.g., dust, bird droppings), material aging, or minor deformations from thermal expansion.
There are also cases where panels from different production batches show slightly different thermal behavior without any evident manufacturing defect. This can lead to false positive diagnoses unless the installation’s history and physical condition are considered.
This combination of technical understanding and cross-referenced information is what makes inspection a preventive tool, not merely a photographic record.
Trust in Precision. Invest in Performance.
Aerial inspection is not just a diagnostic tool, it’s the first step toward ensuring the long-term efficiency and reliability of your photovoltaic park. At TerraView Analysis, we combine technical expertise, high-accuracy equipment, and real field experience to deliver results that translate into real value.
Contact us today for a comprehensive assessment of your installation and discover how precise inspection can enhance your energy performance.
