Thermal camera fault diagnosis

Thermal camera fault diagnosis

Thermal camera fault diagnosis

Why is it important to monitor the condition of solar panels?

Panel defects reduce energy production and thus yield. Nearly 20% of solar parks produce in their optimal operating condition, without any malfunctions – the remaining power plants experience a loss of revenue or even a fire hazard.
In the case of solar parks younger than one year, about 0.5-4% of solar panels show some kind of anomaly, the number of which only increases during operation. These defects can be detected with a thermal imager.
Yield loss can be prevented.
The failure of a single solar panel affects the performance of all panels connected in line with it, so it degrades the production of up to 21-22 other solar cells! If only 1% of the solar cells are faulty, but the faults are scattered in the power plant, they can affect 15-20% of the strings, which results in a loss of revenue of several million forints even in the case of a 0.5 MW power plant. With the help of our thermal imaging service, you can avoid the loss of yield of a power plant that has been operating incorrectly for several years – with reduced power!

What are the benefits of thermovision diagnostics?

  • A thermovision survey can reveal defects that are not visible to the eye.
  • It gives a comprehensive picture of the condition of the power plant to schedule the necessary maintenance. Prevention is always cheaper than treatment!
  • Amennyiben nem hozza az erőmű az elvárt hozamot és nem tudja ennek az okát vagy nem tudja lokalizálni azt, a hőkamerás vizsgálat megoldást nyújt.
  • Gyors és érintésmentes vizsgálati módszer, mely üzemközben elvégezhető, így nem szükséges drágafeszültségmentesítés.
  • It is highly probable that the origin of the defect is a physical impact, a quality problem, a construction defect, or a manufacturer defect.

Why is a thermal imaging test necessary at the beginning of operation?

  • No monitoring data is available at the beginning of the operating time for comparison, in case of some errors it may take years in the reduced operating mode.
  • Relying solely on monitoring data can lead to erroneous conclusions about the condition of the solar park and the location and quantity of faulty panels.
  • It provides a guarantee to both the contractor and the investor that the solar park is working properly.

What defects can a thermal imaging test detect?

  • Solar panel faults
    • PID (Potential induced degradation)
    • Lamination
    • Panel glass discoloration, breakage
    • Cell fracture, micro cracks
    • Snail trail effect
    • Broken connecting guides
    • Incorrect soldering
    • Shunted, shorted cells
    • Shadow effect
    • Bypass diode error
    • Warming solar cables
  • Inverter errors
    • Overloaded cables and other components
    • Active / passive cooling problems

Steps of thermal camera fault diagnosis

First step

  • High resolution thermal images
  • Perfectly focused images
  • Reflection-free recordings
  • Documented irradiation values
  • Professional grade camera based on IEC standard

Second step

  • Identify and document warming areas
  • Documented abnormal thermal patterns
  • Professional software evaluation

Third step

  • Temperature runoff test
  • Recognize changes
  • Categorization of faults
  • Isolation of interference signals

Fourth step

  • Pixel by pixel correction and post-processing
  • Reference to nominal operating values
  • Detection of inactive areas within the cell
  • Power loss estimation
  • Establishing a diagnosis
  • Consultation of results