Abstract:An economic optimization model for the building photovoltaic (PV) system is developed based on the mathematical programming method.It can be employed for the economic optimization and assessment of the PV system for the public buildings.Using the developed optimization model,taking office,hotel,hospital and store as examples of the typical public buildings,the economic performances of the PV systems for the above four buildings are examined.The simulation results show that all the PV systems within the above buildings can receive satisfactory economic performance.However,it is partly due to the existing subsidies from the governments.If the subsidies are reduced to 0.1 Yuan/kWh,the expected payback period will double.