Study on UV Induced EVA Discoloration for Crystalline Silicon Solar Modules

In this paper, the ultraviolet induced discoloration of EVA and power degradation of photovoltaic modules are studied by the extended ultraviolet accelerated life test with high ultraviolet. The power is still in a serious downward trend, when ultraviolet dose in the test reaches 15 kWh/m
²
. The results show that EVA discoloration leads to serious power degradation of modules. Therefore, in order to prolong service life of modules, it is necessary to reduce EVA discoloration. Ultraviolet dose for ultraviolet preconditioning test in IEC61215 should be increased for solar module installed in high ultraviolet region.