5 min read
How drone thermography finds hidden solar panel faults
In short: Drone thermography flies a thermal camera over your array and finds faults by their heat signature (hot-spots, bypass-diode failures, cracked cells and dead strings) long before they show up as a number on a monitoring dashboard, and before they cause lasting damage.
Why a monitoring portal isn’t enough
Monitoring tells you that output is low. It rarely tells you where or why. A single underperforming module in a large array barely moves the headline figure, so it hides. But it’s still losing yield every sunny hour, and some defects (like hot-spots) get worse and can damage the module or, in the worst case, pose a fire risk.
Thermography closes that gap by looking at every module individually, from above, at scale.
What it detects
| Fault | Thermal signature | Why it matters |
|---|---|---|
| Hot-spot | A single bright cell | Localised overheating; can permanently damage the module |
| Bypass-diode activation | One-third of a module hot | A sub-string is disconnected and not producing |
| Cracked / PID-affected cells | Patchy or mottled heat | Gradual yield loss across affected modules |
| String outage | A whole string cool | Zero production from that string until fixed |
| Junction-box / connector fault | Localised heat at edges | Connection failure, a reliability and safety risk |
Why aerial, and why regularly
A drone inspects a large site in a fraction of the time of a manual scan, safely and without touching the array. For a Cyprus site, the highest-value time to fly is before the summer peak, so faults are fixed before the months that earn the most, and after significant events like storms or extreme heat.
From image to action
A thermal scan is only useful if it turns into a fix. We map each anomaly to a specific module and to a prioritised repair list: what’s urgent (safety or fast-worsening), what’s a yield loss worth scheduling, and what’s worth monitoring. That’s the difference between a nice picture and recovered production.
Bottom line
The faults that cost you most are usually the ones you can’t see on a dashboard. Thermography makes them visible: cheaply, at scale, and early enough to act.
Drone thermography is built into our solar PV O&M, and it’s the first thing we run when we take on a system we didn’t install. To scan your array, book an O&M assessment.
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