The rising of oil prices, the power shortages and increasing demand of new energy sources are the main reasons for growing interest in renewable energy. Among various renewable energy sources, the solar power system is a direct conversion of solar energy from the sunlight into electricity and it is expected as clean energy source for future with no fuel, pollution and clean environment. Solar power technology has assumed as a semi-permanent life expectations. In this work, the key element of the BIPV technologies such as PV modules and colors researches have been studied in terms of designing PV modules and coloring of back sheet. This work is also directed to understand the characteristics color of solar cells and back sheet using efficient and harmonious development of PV modules into the design.
Three colors of back sheets such as White, Blue, Black colors have been used and measure the color reflectance measurements. From the star back sheet reflectivity results, the white sheet is comparable to Blue color. Black sheet exhibits high brightness and high reflectance with a sheet of 400 × 400. I-V measurements of PV modules are shown approximately 5 to 6% conversion efficiency and high value of Pmax. The improvement in performance and Pmax is due to reabsorption of the light back sheet color.
The thermal measurements reveal that due to changes in the temperature of the PV module, back sheet is Blue, Black White which attains the average temperature of about 4-5°C, even though the temperature deviation is in the range of about 11-15°C. The light absorption and thermal imaging module of Blue, Black sheet present according to the change of temperature measurements. Such point will influence the weak output of PV module by change in temperatures.
Back sheet colors depending on reflectance and temperature variation are known which were associated with the module''s efficiency. It can be seen that the efficient modules were highly appeared in white sheet, but the color harmony of the PV modules have immense advantages. The use of Blue, Black back sheet on solar cells have shown the strong point of back sheet efficiency and color have the benefits of a sheet reflective coating or thermal treatment. The research and development would be needed to develop various Back sheets for the efficient PV module.