In order to improve the energy efficiency and supply hot water as well as electricity at same time, a set of amorphous-silicon(a-si)solar photovoltaic-thermal(PV/T)hybrid experimental device was designed and produced. According to the experimental data obtained from the PV/T experimental device, energy efficiency and exergy efficiency of the system were calculated, and the thermal performance of the system was analyzed. According to the calculation results, the suggestion for system optimization and energy conservation were proposed. The relationship between the energy output of the PV/T syste...