Lifetime performance of crystalline silicon PV modules

A comparison of the original and weathered power output of several different silicon technologies, dating back to 1982 is presented and confronted together with examples of degradation and weathering effects. The basis of the analysis is the JRC Ispra outdoor test field where examples of diverse generations of PV technology have been subjected to long term climatic exposure. Some of the degradation may be attributed to photon effects while others are more related to encapsulation and delamination issues. The effect of performance degradation on the energy life performance is explored in order to quantify the impact of different degradation mechanisms on the energy generation. Results indicate the initial degradation is not the key issue for maximising energy output.