Deutsch | English | Login

Efficiency EL Module Inspection System

New in 2016:

Technology leader pi4 introduces the 4th Generation of electroluminescence inspection system. Fully automated and reliable failure detection on multi- and mono-crystalline cells are outstanding features. It is designed to be engaged before or after the lamination process in highly automated production lines.

With its short cycle time of only 19s/module including loading and unloading modules(EL Efficiency EL High Speed) it is applicable in every production line. As well as offline in the laboratory, the EL Efficiency is a highly precise El inspection system.

With enhanced functionality like the AEVAL-Software (Advanced EVALuation), even the most complex quality guidelines can be implemented.

The "Power Loss Estimation" (PLE) software feature is a reliable forecast, about the maximum power loss that may be caused in future filed operation by defects detected in cells today.

The pi4 "Repair Station Manager" (RSM) supports the operator effectively  to replace defective cells and strings.




  • Module Size: 1050mm x 2000mm
  • Loading of modules with long edge or short edge leading conveyor height from 925mm up to 1025mm
  • high resolution: 72 megapixel per module
  • short cycle time down to 16 seconds, including mechanical handling and contacting
  • reliable automatic inspection, micro cracks are detected - even in polycrystalline cells
  • PROFIBUS, PROFINET, EtherCATt and other industry standard communication interfaces according to customer requirements
  • AEVAL and Power Loss Estimation, for highest productivity and consistent quality

EL Module Efficiency - product variants

The machine concept of in-line EL inspections systems incorporates all our 20-years experience in the area of machine engineering.

  • secure and precise handling of modules, even unlaminated and with glass thickness down to 2 mm
  • ambient light protection with automatic entry and exit doors
  • precise automatic contacting of modules
  • using only high qualitycomponents of renowned manufacturers
  • flexible adapting of  line interfaces
  • saving energy as well as working space
  • reliable module feeding without any glass bending
  • high resolution by means of moving, highly efficient EL cameras, maximum resolution 72 Mpixel
  • all process related defects like cracks, grid finger breakages,  dark spots, inefficient cell areas and solder failures are automatically detected by comprehensive software algorithms - no operator required
  • adjustable to module size from 990mm x 660mm up to 2000mm x 1050mm
  • low conveyor level: adjustable 925mm up
  • Long Side Leading and Short Side Leading available
  • Cycle times from 19s to 33s depending on model selected, including loading an unloading of modules, image acquisition and evaluation
  • the 4th Generation of low maintenance and sturdy machine design


Inspection result in the operator’s view

Pi4 is an image processing specialist. We have developed a unique technology for reliable defect detection for multicrystalline cells. Furthermore our machine software is easy to use and offers an intuitive user guidance. Based on the defects detected, cells are automatically classified by our advanced  tools AEVAL (Advanced Evaluation) and Power Loss Estimation. Much better and more consistent then any skilled operator could do.

The pi4 Repair Station Manager supports the operator with replacing defect cells and strings. Once a module is feed out to be repaired before lamination, the Repair Station Manager displays the right EL image with indicated defects and power loss calculation for every single cell to the operator.

To top