A photovoltaic panel assembly is a power generating device that produces direct current when exposed to sunlight. Solar energy utilizes a solid photovoltaic cell made up of almost entirely semiconductor materials such as silicon. Since there is no active part, it can be operated for a long time without causing any loss. Simple photovoltaic cells provide energy for watches and computers, and more complex photovoltaic systems provide lighting for homes as well as traffic lights and monitoring systems that are integrated into the grid. The photovoltaic panel assembly can be made in different shapes, and the components can be connected to generate more electrical energy. In recent years, photovoltaic panels have been used on rooftops and building surfaces, and even as part of windows, skylights or shelters, which are often referred to as photovoltaic systems attached to buildings.
According to the survey, due to overcapacity, the profits of the world's top five manufacturers have shrunk. The installed capacity of PV modules will decrease in 2012, which is the first decline in more than 10 years. According to an average of 6 analysts at Bloomberg, global home and business organizations will install 24.8 GW of PV modules. This is equivalent to about 20 nuclear reactors, but it is down 10% from the 27.7 GW of PV installed last year. According to Bloomberg New Energy Finance, the average annual installed capacity has increased by 61% since 1999.