The electroluminescence test is based on the ability of PV cells to luminesce under the influence of an electric current. The wavelength radiated by cells has a width of approximately 1150 nm, which is invisible to the human eye. By using special-purpose cameras, however, it is possible to detect defects in PV cells, which would be impossible to identify with the naked eye.

The Mobile PV Testcenter and the Mobile EL 01 apply appropriate electrical voltage and, using special cameras, capture the surface of the module. The overall image of the module obtained with the electroluminescence method provides information on the existence of defective cells in the module, what these are, and the extent of the damage. The extent of microcracks is the factor that determines whether a module is rendered usable or unusable.

With the electroluminescence test, microcracks can be detected with absolute precision at the moment they were formed.

The electroluminescence test can reveal and document with certainty the existence of PID.

In fact, by performing electro-luminescence tests on PV modules with low current intensity, we can diagnose the PID at the initial stage.

Electroluminescence detects cell corrosion from exogenous or manufacturing causes, fingers/busbar PV cell defects, which are a manufacturing problem, and it can confirm diode failure.