Renewable resources, such as wind generation systems and Photovoltaic (PV) systems, have gained great visibility during the past few years as convenient and promising, renewable energy sources. There are several benefits for solar power systems, such as:

• 　　Clean and renewable energy that replaces power produced by coal, oil and nuclear power (1)

• 　　Reduction/elimination of electric bills

• 　　Silicon for manufacturing PV panels is the second most abundant element on Earth

• 　　The ability to provide power to remote locations