摘要
Introduction The hydropower and wind power being the kinds of re-newable energy that are relatively rich in resources but are re-stricted largely by the locality. On the contrary, photovoltaicpower is less restricted by the locality of the resources, and issafe, reliable, noiseless, non-pollutant, and needs neither fuelconsumption nor the erection of transmission facilities, it may berealized right in places of consumption in large or small
