Fabrication and experimental validation of a building-integrated microtracking CPV system

Integrating microtracking concentrator photovoltaic (μT CPV) systems into buildings offers a pathway to energy-efficient and sustainable construction. To maximise solar energy generation in these applications while maintaining internal illumination, advanced optical designs are needed. This study focuses on the fabrication and experimental evaluation of a μT CPV's optical system, specifically designed for building-integrated applications, utilizing advanced optical concentrators (geometrical concentration of 12.5x) to focus sunlight onto high-efficiency silicon solar cells. We detail the optics design and fabrication process, including material selection, manufacturing, and integration strategies. Key performance metrics were evaluated through experimental testing under controlled and real-world conditions. Our findings demonstrate a maximum optical efficiency of 63.5% and an average solar concentration of 7.9 suns in real-world scenarios. In conclusion, these results highlight the potential of building-integrated μT CPV systems to contribute to net-zero energy goals, enhance urban energy resilience, and promote the adoption of innovative solar technologies in the built environment.