Estimation of Energy Generation and Daylight Availability for Optimum Solar Cell Packing Factor of Building Integrated Semitransparent Photovoltaic Skylight

The semitransparent PV (STPV) module apart from energy generation is also beneficial in providing daylight inside the building. In this paper, mathematical expressions were used for estimating the daylight illuminance (lx) and electricity generation (kWh) through the STPV skylight for the composite climate of New Delhi (28.7041° N, 77.1025° E) at various packing factor (β) (0.4 to 0.9) of the solar cells. Further seasonal optimum (βopt) is predicted for appropriate daylight and electricity generation, which found in the range from 0.57 to 0.62. The appropriate illuminance of above 300 lx and maximum hourly generation of 40–65 W for 5–7 h are obtained for the β of 0.62.