4. 1 PV Module Design, Manufacture, Performance and Reliability
Summary / Abstract:
Spectral imaging techniques are powerful tools for surveillance and monitoring of degradation mechanisms in PV power plants. For this purpose, the development of luminescence imaging techniques of silicon solar modules started recently with both electroluminescence and photoluminescence imaging outdoor as well as in daylight. Electroluminescence images make it possible to investigate different types of degradation such as poor ribbon soldering, cracks, isolated regions, PID, finger interruptions etc1 . Outdoor photoluminescence images have so far been used to analyse increased series resistance due to isolated regions2 as well as bypass diode failures2,3 . Outdoor photoluminescence imaging is a new technique in which the focus so far has been on imaging one module. Present work aims to contribute to a technique for photoluminescence image acquisition which can make it possible to image several modules in a string at the same time. Furthermore, the aim is to obtain a better understanding of possibilities and limitations regarding monitoring of degradation mechanisms with photoluminescence images acquired in this way compared to electroluminescence images.