The photovoltaic electroluminescence measuring and testing method enables us to detect errors and defects of individual solar cells of the photovoltaic modules. Here, the luminescence uses the light (luminesce) of the PV modules when they are reverse energised.
TESTING PHOTOVOLTAIC MODULES USING LUMINESCENCE MEASUREMENT
Storm, hail, transport and assembly can damage solar cells of the PV modules, even if they look to be in good condition. When solar cells don’t function properly, it’s possible that one or more solar cells have micro cracks, cell fractures or potential induced degradation (PID). Depending on the degree of damage, this can cause yield reduction or failure of complete solar modules. In rare cases, overheating and hotspots are possible consequences.
In order to detect such faults, solar modules can be examined for micro cracks, cell fractures and PID using an electroluminescent camera. The EL pictures will show if solar cells are broken or cracked and if there are any electrically inactive areas.
Not only individual PV cells and PV modules can be studied using electroluminescence. Complete PV rooftop installations and solar farms can be recorded and evaluated.
EL- MEASURING OF THE COMPLETE SOLAR SYSTEM OR OF INDIVIDUAL PV-MODULES
The electroluminescence examination is a non-contact measurement. In order to examine the solar module, individual modules or complete strings are energised and thus brought to light.
The technician has various options to examine the photovoltaic system using EL. The PV generator can be checked from a distance by using the electroluminescence camera. Technicians can also get close to individual PV modules and solar cells by using lifting equipment, ladders and walking on the roof. A further option is to test modules in the mobile PV test centre. However, this involves dismantling the modules first.
Electroluminescence makes it possible to test photovoltaic systems for possible micro cracks, cell fractures and PID quickly and easily.