The purpose of this research is to develop a polycrystalline semi-transparent silicon solar panel for building integration by varying the spacing between solar cells from 1, 2.5 and 4 cm, respectively (3 panels). These solar cells were then connected in series using floated glass (88 ? 78 cm2) as a substrate. The testing results of all solar panels showed that module 1, 2 and 3 has energy conversion efficiency of 7.27, 7.00 and 6.87% and the energy generation was estimated to be 64.6, 50.9 and 43.8 Wh/day, respectively. For daylight testing aspect, it was found that module 3 provided the maximum internal illuminance level of 2,946 lux, while module 1 and 2, which has less transparent area, also provided less internal illuminance of 1,049 and 1,330 Lux, respectively. Evaluation of the net energy of the testing room where the consideration of electricity generation and lighting energy consumption when the internal illuminance lower than 500 Lux is taken into account. The result revealed that the net energy of 25.6 Wh/day, 43.2 Wh/day and 41.5 Wh/day was approximated when the wall was installed with panel 1, 2 and 3, respectively. It was seen that panel 2 offers the highest net energy and it is, therefore, suitable to be used with the building in order to maximize the benefit from electricity generation and natural light.