What are the defects of the use of solar induction street lamp?

Solar street lights use solar photovoltaic cells to provide electricity, solar energy as a green and environmentally friendly new energy, "take inexhaustible, inexhaustible". Making full use of solar energy resources has positive significance for easing the shortage of conventional energy. The installation of solar street lights is simple and convenient, without the need for a large number of basic projects such as laying cables as ordinary street lights, only a fixed base is required, and all lines and control parts are placed in the light frame to form a whole. The operation and maintenance cost of solar street lights is low. The entire system is operated automatically, without human intervention, and almost no maintenance costs.

Instability: Due to the limitations of natural conditions such as day and night, seasons, geographical latitude and altitude, as well as the influence of random factors such as sunny, cloudy, cloud and rain, the solar irradiance reaching a certain ground is both intermittent and extremely unstable, which increases the difficulty of large-scale application of solar energy. In order to make solar energy a continuous and stable energy source, and eventually become an alternative energy source that can compete with conventional energy sources, it is necessary to solve the problem of energy storage, that is, to store the solar radiation during the clear day as far as possible for night or rainy days, but energy storage is also one of the weaker links in the use of solar energy.

Low efficiency and high cost: the level of development of solar energy utilization, some aspects are theoretically feasible, and technically mature. However, some solar energy utilization devices, because of low efficiency and high cost, in general, the economy can not compete with conventional energy. For a considerable period of time in the future, the further development of solar energy utilization is mainly restricted by economy.

Dispersion: Although the total amount of solar radiation reaching the Earth's surface is large, the energy flux density is very low. On average, near the Tropic of Cancer, when the weather is relatively clear in summer, the irradiance of solar radiation at noon is the largest, and the average solar energy received on an area of 1 square meter perpendicular to the direction of sunlight is about 1,000W; If the day and night are averaged throughout the year, it is only about 200W. In winter, it is only about half, and the cloudy day is generally only about 1/5, so the energy flow density is very low. Therefore, when using solar energy, if you want to get a certain amount of conversion power, you often need a fairly large set of collection and conversion equipment, and the cost is high.