What Did the Inspection Find?

The array was, on the whole, healthy and operating uniformly, which is itself a useful result to be able to certify. Against that clean background, four anomalies stood out. The most significant was a string presenting a uniform raised temperature across a group of modules, with no internal cell-level pattern. That signature is characteristic of a string that is not exporting current, where the sun’s energy is being shed as heat instead of converted to electricity, so it was read as an open-circuit or non-exporting condition rather than as damage to the modules themselves. It was classified Medium severity, and under the Drone Media Imaging Consequence Classification framework it carries a Yield consequence, meaning a measurable loss of output while it persists. The other three findings were early-stage: a developing bypass diode signature and two single-cell anomalies, one symmetrical and one asymmetrical in pattern. None approached a safety threshold, and each was classified Low severity with a Degradation Trajectory consequence, the framework’s term for a condition that is modest now but progressive, and so worth monitoring rather than acting on immediately. The electrical testing told a reassuring story on the strings assessed, with voltages and currents tightly grouped, insulation resistance far above the minimum, healthy fill factors and sound earth continuity.

What Did This Mean for the Client?

The deliverable was a certified report carrying the sign-off of our Level 3 Master Thermographer, translating the survey, analysis and reporting work into something the owner could act on. The Consequence Classification framework is the part clients tend to value most, because it converts a technical severity grade into a plain statement of what each finding means for the asset, output lost now, or a condition to keep an eye on. That gave the owner a clear, ranked picture rather than an undifferentiated list of warm spots.

Sensible next actions for the asset owner:

• Treat the non-exporting string as the priority, as it is the finding affecting output now.
• Keep the diode and cell-level signatures under observation for progression at the next inspection.
• Use the report’s condition baseline as the reference for future periodic testing.

Findings of this kind point to areas warranting further investigation by a suitably qualified electrical contractor rather than to a prescribed repair, because thermography identifies and electrical testing measures, but confirming a root cause is a job for hands-on investigation. Set in a wider context, this is where solar inspection is heading: away from occasional visual checks and toward regular, evidence-led condition monitoring that protects the long-term yield of an asset expected to perform for decades.

What Made This Project Notable?

The strength of this job was method rather than drama. By flying an aerial thermal survey and running electrical string testing on the same visit and reading the two together, the inspection could describe not just where the array was warm but what the electrical behaviour suggested was happening beneath it. A non-exporting string seen in the heat data, set against satisfactory electrical results elsewhere, is a clearer and more defensible picture than either dataset alone would give.