What are the advantages and disadvantages of the household photovoltaic power generation system

Photovoltaic power generation is the main principle of the photoelectric effect of the semiconductor. Photons illuminate to metal, its energy can be absorbed by all metal in an electronic, electronic absorption energy is enough big, can overcome the metal work of internal force, escape from the metal surface

photovoltaic power generation is the main principle of the photoelectric effect of the semiconductor. When photons illuminate metal, its energy can be absorbed by the electrons in a metal completely. Electronic absorption energy is enough big, can overcome the internal force of the metal work, and escape from the metal surface become photoelectron. The silicon atoms has four external electronic. If pure silicon doped with five external electron atoms, such as phosphorous, it becomes a kind of n-type semiconductor. If pure silicon doping has three external electron atoms, such as boron atoms, p-type semiconductors are formed. When the P and N together, contact surface will form a potential difference, become a solar cell. When sunlight to pn junction, an empty hole from polar mobile P to N poles, electrons from N polar moved to P polar, form a current. The photoelectric effect refers to the semiconductor lighting in uneven or between different parts of the combination of semiconductor and metal to produce the phenomenon of electric potential difference. First of all, this is a photon ( Light waves) Into electronic, the process of convert light energy into electrical energy. Second, it is a process of voltage form. Polycrystalline silicon ingot casting, broken made silicon ingot and slice for processing. By doping and diffusion trace amounts of boron, phosphorus, etc form pn junction. On a silicon wafer. Then using screen printing will be good silver paste printing in grid line is formed on the silicon wafer, sintering, making the back electrode at the same time, the surface coated with a layer of the grid line antireflective coating, made into cell. Cells are arranged and combined into battery components to form a large circuit board. Usually, the aluminum frame wrapped around the component, the side covered with glass, the back is equipped with electrodes. Use battery components and other auxiliary equipment, power generation system can be formed. To convert direct current into alternating current (ac), the need to install a converter. After power generation, can through the battery storage or enter the public power grid. Battery components accounted for about 50% of the cost of power generation system, and current transformer, installation expenses and other auxiliary components and other fees accounted for another 50%. Solar power system is a kind of use solar cells convert solar energy directly into electrical energy power generation system. Household solar power generation system consists of solar battery, solar controller and the battery ( Group) Composition. If the output power to 220 v or 110 v ac, also need a inverter. Advantage 1. Solar energy is inexhaustible. Receives the solar radiation energy of the earth's surface can meet the energy demand in the global 10000 times. As long as 4% of the world's desert installed solar pv system, generate electricity can meet global demand. Safe and reliable solar power, not influenced by the energy crisis or unstable fuel market. 2. Solar energy is everywhere, without long distance transmission, nearby power supply, avoid the loss of long distance transmission line; 3 do not need fuel, solar energy, low operation cost; There are no moving parts, solar power, not easy to use and easy to damage, maintenance is simple, is particularly well adapted for use in the case of unattended. 5. Solar power does not produce any waste, no pollution, noise pollution, no adverse effects to the environment, is an ideal clean energy.