Thermal drones inspect solar panels by flying over the array in strong sunlight and recording heat patterns. Panels with faults such as hot cells, failed bypass diodes or disconnected strings show up hotter or cooler than their neighbors, so one flight can screen thousands of modules that would take a crew days to check by hand. You need a Part 107 certificate for paid inspections; you don't need a solar installer's license just to fly and report.
What the scan finds
- Hot spots and hot cells from cell damage, shading or soldering faults
- Bypass diode failures, which show as a heated section of a module
- Offline modules or strings, often a uniform temperature difference across a row
- Soiling, bird droppings and vegetation shading
- Physical damage such as cracked glass, often clearer in the visual image
Thermal shows where to look. Technicians confirm the cause with electrical tests (IV curve tracing, string checks) before replacing parts.
How to fly a solar inspection
- Fly in strong, steady sun. Faults only show up when panels are producing power. Industry guidance such as IEC TS 62446-3 sets minimum sunlight conditions for valid thermal inspection; avoid passing clouds.
- Low wind keeps panel temperatures even.
- Avoid reflections. Angle the camera so you don't capture the sun or sky reflected in the glass.
- Fly an automated grid at a height that gives enough thermal pixels per cell for the faults you need to detect.
- Capture visual and thermal together so each hot spot can be matched to a visible panel.
- Record conditions: time, ambient temperature, wind and irradiance if the site logs it.
Which drone to use
| Drone | Thermal resolution | Notes |
|---|---|---|
| Mavic 3 Enterprise (3T) | 640 x 512 | Compact; good for rooftop and small ground-mount sites |
| Matrice 4T | 640 x 512, 1280 x 1024 with Super Resolution | Wide plus two telephotos and a laser rangefinder |
| Matrice 350 RTK + Zenmuse H30T | 1280 x 1024 | For utility-scale sites and harsher conditions |
All three are radiometric, so you can read temperatures from each image. See best thermal drone.
Do you need a license?
- To fly: a Part 107 Remote Pilot Certificate and a registered drone. See Part 107.
- To install or repair solar panels: that's a separate question. Most states require an electrical or specialty contractor license for solar installation; the rules vary, so check your state's contractor licensing board. A drone inspector who only flies and reports usually doesn't need one.
- Site access: utility-scale and commercial sites often require safety training and an escort.
Reports and pricing
Clients want a map of the array with each fault located by row and module, the thermal and visual image, the temperature difference and a severity rating. See drone inspection reports and drone inspection pricing.
Rules current as of October 2026. This is general information, not legal advice.
Choosing a thermal drone for solar? Contact us for a Mavic 3T or Matrice 4T quote.
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