IEC 62446-3 Solar Farm Inspection - How Airsuv Applies the Standard
IEC 62446-3 is the international standard for aerial thermographic inspection of photovoltaic systems. It defines the conditions, parameters, and documentation requirements that an aerial thermal survey must meet for the results to be technically defensible.
For O&M contractors, asset performance engineers, and solar farm owners commissioning inspection work, IEC 62446-3 is not optional — it is the baseline. A thermal survey that does not meet the standard produces data that cannot be reliably used for performance assessment, maintenance planning, or asset reporting.
This article explains what IEC 62446-3 requires and how Airsuv's ARC capture system delivers compliance on every solar farm mission.
What IEC 62446-3 Requires
The standard sets out specific requirements across three areas: capture conditions, capture methodology, and documentation.
Capture Conditions
Thermal inspection must be conducted under defined environmental conditions. The most critical requirement is irradiance — the solar array must be receiving a minimum of 600 W/m² of incident solar radiation at the time of thermal capture. Below that threshold, the temperature differential between performing and underperforming modules is insufficient to produce reliable thermographic data.
Wind speed, ambient temperature, and time of capture relative to peak irradiance are also relevant to the quality of the thermal dataset. IEC 62446-3 requires these conditions to be recorded and reported.
Capture Methodology
The standard requires that every module in the array is captured within a defined ground sampling distance (GSD). Coverage must be complete — no modules may be omitted. The flight path must produce consistent overlap to ensure adjacent modules can be compared without gaps in the thermal record.
Where RGB and thermal capture are both required — which is standard practice for a compliant survey — the thermal flight path must replicate the RGB flight path to allow direct pixel-level comparison between the two datasets.
Documentation
IEC 62446-3 requires a conditions log recording irradiance, ambient temperature, wind speed, and time of capture. This log is part of the deliverable — not an internal note. It is the evidence base that allows the client to confirm the thermal data was captured under conditions that meet the standard.
How Airsuv Applies IEC 62446-3 Through ARC
Every Airsuv solar farm mission is structured to the ARC five-layer capture system, with IEC 62446-3 compliance built into each layer.
Before thermal capture begins, irradiance is confirmed at or above 600 W/m². If conditions do not meet the threshold, the thermal capture does not proceed. Thermal timing is confirmed with the client's O&M team per site. The standard defines the requirement. ARC defines how Airsuv meets it.
ARC-1 — Full array overview. Site orientation, panel layout, and string configuration reference established.
ARC-2 — 100% array coverage at consistent GSD. IEC 62446-3 grid parameters applied. RGB pass completed first. Thermal replication uses identical flight path and spacing.
ARC-3 — Feature capture of module mounts, junction boxes, and string combiner points.
ARC-4 — Close-range detail of specific points of interest identified during ARC-2 and thermal capture.
ARC-5 — Conditions log: irradiance (W/m²), ambient temperature, wind speed, time of capture. IEC 62446-3 reporting requirement fulfilled.
What the Client Receives
Every Airsuv IEC 62446-3 solar inspection delivers: radiometric thermal R-JPEG dataset with full temperature values retained per pixel, RGB orthomosaic (GeoTIFF) for visual condition reference, GPS-referenced per-module imaging, string-level data mapping where array configuration is provided, and a complete IEC 62446-3 conditions log.
Thermal data is delivered in full radiometric R-JPEG format. Temperature values are retained across every pixel of every image. Delta T values are present in the dataset. Threshold application and interpretation are the client's responsibility — that is the scope boundary Airsuv operates within.
Standard delivery within 24 hours for single-site captures. Larger arrays and multi-site programmes are confirmed at quote stage.
Arrays Covered
Airsuv covers ground-mount arrays from 1MW to 50MW+ and rooftop commercial and industrial arrays. Array scale affects mission planning, capture time, and dataset volume — all confirmed at the quote stage against the client's array configuration.
IEC 62446-3 compliant solar thermal inspection. ARC-structured. Delivered within 24 hours.
Solar farm inspection enquiries to airsuv.uk/airsuv-quotes or contact@airsuv.uk.
