introduction Solar energy is a green energy source that the state focuses on promoting development and utilization. The widespread use of this energy is of great significance for reducing emissions of carbon dioxide and other toxic gases, reducing atmospheric pollution, and protecting the ecological environment. It is the historical mission of all mankind and society as a whole. China's land resources are vast, human beings are scattered, and conventional energy supply is lacking. In most parts of the western region, the natural conditions are relatively harsh and the economy is backward. So far, the total number of households without electricity in the western region has reached 10 million, and even the most basic living lighting has not been completely solved. To this end, the state has implemented the “Bright Project†program in western China in the region, using solar energy to solve local energy problems. Under the guidance and support of national policies, China Solar has basically formed a photovoltaic industry market in the western region through the hard work of PV workers. There are dozens of small PV companies in China that have integrated R&D, production, supply and sales services. These enterprises are cultivating The photovoltaic market has contributed to meeting the needs of the majority of farmers and herdsmen. However, due to insufficient capital investment, the overall technology, production equipment and testing methods are relatively backward, and there are many problems in product performance and quality. Despite this, after the photovoltaic market has experienced a period of growth, with the improvement of people's living standards, the production of photovoltaic products is increasingly unable to meet the needs of life. Now, PV companies should adjust their product mix in time, increase capital investment, and improve product quality. Form an industrialized production scale and further improve the technical performance and price ratio of products. The government should also introduce some preferential policies to support the development of the industry, promote the development of the solar energy industry, enable it to enter a benign development, and have international competitiveness as soon as possible. 1. Current status of photovoltaic applications With the advancement of solar cell and its component manufacturing technology, the photoelectric conversion efficiency of monocrystalline silicon cells is close to 30%, and solar photovoltaic systems are also moving from low-grade to high-grade, from small independent power generation systems to large-scale solar power plants. Development, solar power technology has gradually matured. Especially in Europe, the United States, Japan and other countries, solar photovoltaic technology is more advanced, a wide range of applications, the goal of photovoltaic power generation has been to the city, and is vigorously promoting the roof solar grid power generation plan. In China, with the country's emphasis on new energy development, the investment in capital has been increased, and the solar photovoltaic industry has also been vigorously developed. A number of research institutes and solar energy research and utilization have achieved fruitful results. Both the solar energy research and development technology and the solar energy utilization field have made great progress. In the development and application of solar energy products, they have taken a substantial step, laying the foundation for promoting the solar photovoltaic industry to the market. However, if the overall quality and technical performance are relatively backward compared with similar foreign products, it is difficult to compete with foreign products. The production of China Solar's domestic household PV products is concentrated in the western part of China, and the production of household PV products is mostly small private enterprises. Single variety, small production scale, mostly stay in workshop-style production, backward technology, standard and technical specifications are not perfect, not matched, lack of necessary testing equipment, lack of process regulation; technical route behind, generally based on analog electronic circuits The product performance is unstable, the quality is poor; the function is single, which affects the overall performance of the system. It is imperative to develop many varieties, expand the scope of application, increase capital investment, and form large-scale production. 2. Market analysis of household photovoltaic system products Under the encouragement of the national new energy policy, solar photovoltaic power generation has developed rapidly. Although China's photovoltaic industry has just started, but the market potential is huge, there are many business opportunities, foreign PV companies are very optimistic about the Chinese market. According to the survey data of the market-free sales department of the company in the western power-free area, the domestic demand for low-power household photovoltaic power supply is 1.5 million sets (sets); the large-scale photovoltaic power generation (station) system is 50,000 sets (seats). 100,000 sets of photovoltaic power systems for communication. The proportion of each item is shown in Figure 1. With the implementation of the country's western development strategy, the economy of the western region will enter a period of rapid development. The economic income of the majority of farmers and herdsmen in the western areas without electricity will increase relatively, and living conditions will also improve. Due to the particularity of the living environment, conventional energy cannot be successfully implemented, and the application of photovoltaic power for small and medium-sized households will be promoted. 3. Prospects for the application of photovoltaic systems The solar photovoltaic power system has unique conditions for its application in China. First of all, China has a vast territory and unbalanced economic development. Although the western region has abundant power resources, due to the constraints of geographical environment and transportation, conventional power is considered from an economic perspective. It is not easy to enter, making people's living environment in these areas extremely harsh. The country’s western economic development policy has injected vitality into the economic development of this region. The "Guangming Project" implemented in the west also solved the problem of electricity, office and school electricity consumption in some towns, so that some farmers and herdsmen ended the history of non-electricity and improved living conditions. However, there are still millions of farmers and herdsmen in the western nomadic semi-nomadic country in China, and the market potential of household photovoltaic systems is very large. The entry of photovoltaic systems into the stage of large-scale power generation means that the current energy structure will undergo fundamental changes and is a revolution in the use of energy by human society. The grid-connected power generation system is an important indicator of the progress of photovoltaic technology. Since the 1990s, foreign developed countries have set off the climax of the development of rooftop grid-connected photovoltaic systems. The roof-connected photovoltaic system fully considers the dispersive characteristics of sunlight, and installs solar cells on the ready-made roof, which is flexible and economical. They are much better than large-scale grid-connected photovoltaic power plants, and they are highly valued by all countries. 4 Conclusion Due to its small power, flexibility and easy installation, the household PV system is suitable for the use of electricity, communication power supply, etc. in the vast areas of non-electricity, such as farmers, herdsmen and nomadic people, and with the advancement and development of battery technology. The household photovoltaic grid-connected power generation system gradually moves toward the city. The perfect combination of photovoltaic power generation and construction constitutes a rooftop household photovoltaic grid-connected power generation system, which is attractive in the future and has a broad market. 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