Test Methods

Electroluminescence method

  • Non-contact test method
  • Special camera, use of infrared sensors
  • Can be used at the customer's site
  • Individual modules can be tested
  • Detection of damage such as micro-fissures caused by hail, PID and transport damage,
  • Detection of electrically inactive areas (cells/cell segments)
  • Detection of faults/defects that would not be detectable with a visual check

Detection of concealed cell damage after hail

PV module without visible damage

Thermography method

  • Infrared images with special camera
  • Non-contact test method
  • Can be used at the customer's site
  • Individual modules or entire system can be checked
  • Detection of defective bypass diodes, defective solder joints (increased contact resistance), inactive PV modules/cells
  • Testing of inverters, AC connections, fuses and DC cabling and their connectors
  • Detection of defects that would not be detectable with a visual check

early detection of potential fire hazards with the thermography method


Defective bypass diode --> leads to power loss of the string

Characteristic I-V curve measurements

  • Proven and well-known testing method for performance assessment
  • Fast and mobile method for determining the performance of individual modules or entire strings
  • Determination of the current/actual power under real conditions
  • Detection and analysis of shadowing and/or defective modules

Detection of defective modules in the string

Properly functioning string
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