Visual and electrical degradation of 22 years field age monocrystalline silicon PV module in composite climate of India

This paper presents the analysis of visual and electrical degradation of 22 years field aged mono crystalline silicon PV module in composite climate of India. The visual degradation data is correlated with the electrical performance degradation data. Average power degradation rate for the studied PV module is more than 1% per year. The discoloration of back-sheet, bus-bar, cell inter connect ribbon, string interconnect ribbon and solar cell are found to be obvious in all the modules, however the percentage of defects are different.