Photovoltaic drone


Fault localisation and characterisation. Analysis of energy losses and risks for the installation.

diode bypass

Photovoltaic park thermography

Inspect PV plants and target energy losses

Since 2012, we have inspected several hundred solar installations.

Feedback and our regular exchanges with our customers ensure that you have a good inventory of faults and the condition of your plant. After each thermal inspection, a meeting is scheduled to ensure proper use and understanding of the renderings.

The defects of photovoltaic power plants

Classification of thermal anomalies

Toit de ferme couvert de panneaux photovoltaïques


Each type of fault generates an energy loss ranging from a few % of production to complete faulting of several modules.

Depending on the plants, these faults can represent a shortfall of up to 45% of production in the most critical cases.

Hot spot 80°C sur des panneaux solaires défectueux


Beyond performance, several defects can cause risks for the integrity of the installation, even for that of third parties in certain cases (shadehouse fire, storage warehouse roof). Example (attached): Hot spot at 80 °C. Difference of 40 °C with the temperature of a healthy panel.
Hot spot 80°C sur des panneaux solaires défectueux


Thermal faults that do not involve any destructive risk or significant loss of yield are classified as minor faults.

These faults are located on the photovoltaic power plant and categorised by type. We also sort them according to the temperature difference with “healthy” solar panels.

Orthoplan | Geolocalisation | Wedging on plan

An interactive thermal inspection report

Assemblage thermique panneaux photovoltaïquesgrille disposition de panneaux solaires
To simplify the renderings, we carry out a thermal assembly of the photovoltaic power plant to have a general overview of its condition and the location of the faults.

An RGB stitching is also made to get an overview of the solar installation in the visible range.

To do this, we make many thermal images on the installation that we assemble in our treatment process.

This allows us to keep the thermal information of the thermograms which will be used to classify the defects with precise measurements.

This assembly is then superimposed on the plan of your solar power plant with a layer system.

This allows you to quickly switch between layers to identify the number of defective panels.

After the thermal inspection of the solar panels, our rendering is designed to simplify the treatment of faults on your plant.
  • 5Thermal assembly
  • 5Overlay on plant plan
  • 5Interactive report

During the thermal inspection of the plant, we also produce “classic” so-called RGB images. These images allow us to better identify the nature of the defects when the thermal image is not enough (crack, presence of dirt)

Panneaux solaires toitureThe organisation of tours for thermal inspections allows our teams to inspect up to 7 central roofs per day.. This number depends on the distance between each plant and the inspection period. Thermal inspections of photovoltaic power plants are more effective in summer for meteorological reasons.

Panneaux solaires entrepôt We also inspect medium-sized photovoltaic power plants such as carports, agricultural roofs or warehouse roofs.

On these plants, we can carry out up to 4 thermal inspections per day, which allows us to offer attractive costs.

centrale-photovoltaïque-sol For the thermal inspection of ground-based solar power plants, we have created a capture process that allows us to inspect solar power plants with a power of up to 300 MWp. This process allows us to thermally and visually inspect the entire plant in a short time.

The conditions for a good thermal inspection


Minimum production of the plant: 70%
icone de panneau solaire

Panel cleanliness

A clean plant reduces the number of false positives.

saison pour faire de la thermographie aérienne

Period of the year

We advise to inspect in the period between April and October.


The different types of thermal faults

string entière de panneaux photovolataïques défectueux

Full thong

Photovoltaic module fault : One module is hotter than the others. (a full line)

Error and possible cause : Panel malfunction. The module is disconnected.

Consequence : Zero production.

Constellation de capteurs solaires défectueux


PID (Potential Induced Degradation) : Constellations of cells hotter than the others.

Error and possible cause : Short circuit, faulty bypass diodes, broken panel.

Consequence: Performance loss

diode bypass

Bypass diode

Bypass diode fault : A line of cells is hotter. Error and possible cause : Short-circuit Defective bypass diode. Consequence: PPerformance loss on the entire line. A hot spot is often detected in thermography.
Hot spot 80°C sur un panneau solaire

Hot spot

Hot spot fault : A cell is much hotter than the others making up the photovoltaic panel.

Error and possible cause : The cell is defective.

Consequence: Performance loss. A visual and more thorough inspection is required.

Modèle défectueux d'un parc photovoltaïque

Defective module

Default of a string of modules : A line of panels is warmer than the others.

Error and possible cause : A defective panel can cause the entire string to malfunction.

Consequence: Performance loss over the entire series.

ombrage celleule photovoltaïque

Cell shading

Shaded cell : A cell is much hotter than the others.

Error and possible cause : The photovoltaic cell is shaded. Vegetation, a building, dirt, etc. conceal it.

Consequence: Performance loss of the cell as well as the entire solar panel.

Our expertise in aerial thermography also extends to other sectors of activity :

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