What is the principle of off-grid photovoltaic power generation system?

     The working principle of off-grid photovoltaic power generation system is very similar to that of grid-connected photovoltaic power generation system. The difference is that the power output from off-grid system is directly consumed and used and not transmitted to the public grid. Solar power generation, thermal power generation and photovoltaic power generation. Production and sales. Development speed and development prospects. CSP can not catch up with photovoltaic power generation. It may be because of the wider popularity of photovoltaic power generation and less exposure to CSP. Generally speaking, solar power generation often refers to solar photovoltaic power generation. It is referred to as photovoltaic power generation. Photovoltaic power generation is based on the principle of photovoltaic effect. Solar cells are used to directly convert solar energy into electrical energy. Whether it is used independently or connected to the grid to generate electricity. Photovoltaic power generation systems are mainly composed of solar panels (components). Controllers and inverters. Most of the components. They are mainly composed of electronic components. No mechanical parts are involved. Therefore, photovoltaic power generation equipment is extremely refined. Reliable, stable and long life. Installation and maintenance are simple. Theoretically, photovoltaic power generation technology can be used for any occasion where power is required. Up to spacecraft. Down to household power supplies. As large as megawatt power stations. As small as toys. Photovoltaic power can be ubiquitous. At present, photovoltaic power generation products are mainly used in three aspects: one is to provide power for non-electric occasions. Mainly Provide electricity for the life and production of residents in the vast areas without electricity. There are microwave relay power supplies, etc. In addition. It also includes some mobile power supplies and backup power supplies, and the second is solar daily electronic products. Such as all kinds of solar chargers, solar street lights and solar lawns. The third is grid-connected power generation. This has been widely promoted in developed countries. China’s grid-connected power generation has not yet started. However, in 2008 Beijing [Green Olympics" part of the electricity will be generated by solar power and wind power Power generation provision.

     The most basic component of solar photovoltaic power generation is solar cells (sheets). There are monocrystalline silicon, polycrystalline silicon, amorphous silicon and thin-film batteries. At present, monocrystalline and polycrystalline cells are used in large quantities. Amorphous cells are used in some small systems and calculations. The efficiency of domestic crystalline silicon cells is about 10-13%. The efficiency of similar foreign products is about 12-14%. Solar panels composed of one or more solar cells are called photovoltaic modules. In 2002, global solar cells The output of photovoltaic modules is about 600MW. Japan accounts for 45%. The United States 25%. Europe about 22%. Japan is the fastest growing factor in the photovoltaic industry. It surpassed the United States in less than 10 years. The top 10 in the world in 2001 There are 4 solar cell manufacturing plants in Japan. They are Sharp. Kyoto Ceramics. Sanyo and Mitsubishi. Most developed countries in Europe and the United States have formulated the "Sunshine Plan". Measures have been taken to encourage residents to install solar power generation systems. For example, partial grants. Interest-free Loans and [seed funds", etc., and purchase surplus solar power in residents’ homes at a price several times higher than the ordinary electricity price.

China's solar photovoltaic power generation industry has developed rapidly in recent years. But the overall scale is small. In 2002, the output of solar cells was about SMW. The cumulative installed capacity reached 25MW. Less than 1% of the world. In order to cooperate with the western development, the Chinese government implemented the [ "Sunshine Project". [Chengfeng Project" and [Bright Project", etc.. Use solar power and wind power to solve the electricity consumption of farmers and herdsmen in the vast western regions without electricity. The supporting funds of this project are more than 2 billion yuan. China's photovoltaic power generation The market for products is mainly in the west. There are also some products coming out of the day. Such as modules, small systems and daily-use solar electronic products. Because the domestic solar cell wafer production is far from meeting the demand. Many manufacturers import a large number of solar cell package modules. In In the photovoltaic industry. Shenzhen occupies part of the country. Product processing capabilities. Product quality and sales have a certain impact at home and abroad. The government should increase support. Make it expand and develop into an industrial cluster. In turn, it will become an economic growth point for Shenzhen .

The solar photovoltaic power generation industry is growing rapidly. It is not only because it is a clean energy with many advantages. A more attractive motivation is. In the process of integration of solar energy and buildings. Solar cell modules are more compatible with buildings than solar water heaters. The sun. Battery modules can not only be used as energy equipment. They can also be used as roofing and wall materials. It not only saves power and saves building materials, but also saves building materials. There are already very good cases abroad. Therefore, the combination of solar photovoltaic power generation technology and buildings.