A system with PVT collectors generates electricity which can utilize it directly, store it in batteries and send it to electrical grid. This system produces thermal energy that can be employed for process heat, hot shower and tap water, solar cooling and desalination. Building integrated photovoltaic thermal systems (BIPV/T) is a new concept that received much more attention. This work shows the results of performance simulation study of a-Si and c-Si photovoltaic/thermal (PVT) solar collector in tropical climate such as Malaysia. The results show that at solar radiation between 700-900 W/m 2 , ambient temperature between 23-34°C and fluid flow rate of 0.03 kg/s, the highest thermal and electrical efficiency of the PV/T (a-Si) was 72% and 5%, respectively, the highest thermal efficiency of (c-Si) was 51% and cell efficiency was 11.6%.
