Performance analysis of grey PV module with optical characteristics

Abstract

Coloured PV modules improve the exterior design of normal PV modules and improve the aesthetics as well through various colour characteristics. In particular, for a BIPV system installed in place of conventional building envelope material, a coloured PV module can be efficiently utilized for harmonization with the building exterior materials, and to improve design. However, the electrical efficiency of coloured PV modules can decrease depending on the colour characteristics. In this study, the electrical performance characteristics of a coloured PV module with grey front glass (digital printing) were analysed through optical and outdoor performance tests and compared to those of a normal PV module with clear glass. Based on optical test results, the total solar transmission (S-Factor) of the grey glass was lower by approximately 15% compared to that of the clear glass. Similarly, electrical efficiency of the grey module was decreased due to its colourisation compared to the normal PV module. Outdoor experimental results showed that the temperature of the grey PV module was up to 3 °C lower than that of the normal PV module.