Everyone knows that there are many advantages of led so […]
Everyone knows that there are many advantages of led solar street lights, energy saving and environmental protection, to solve the energy crisis, but they do not realize that solar street lights also have their limitations.
1. Dispersibility: Although the total amount of solar radiation reaching the surface of the earth is large, the energy density is very low. On average, near the Tropic of Cancer, when the weather is clear in summer, the irradiance of solar radiation is the largest at noon, and the solar energy received on an area of 1 square meter perpendicular to the direction of sunlight is about 1,000W on average; The average day and night throughout the year is only about 200W. In winter, it is only half, and cloudy days are generally only about 1/5. This energy density is very low. Therefore, when using solar energy, to obtain a certain conversion power, a set of collection and conversion equipment with a relatively large area is often required, and the cost is relatively high.
2. Instability: Due to natural conditions such as day and night, seasons, geographic latitude and altitude, as well as random factors such as sunny, overcast, cloud, and rain, the solar irradiance reaching a certain ground is intermittent , It is 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 finally become an alternative energy source that can compete with conventional energy sources, the problem of energy storage must be solved well, that is, the solar radiant energy during the sunny day should be stored as much as possible for the night or rainy days. Day use, but energy storage is also one of the weaker links in solar energy utilization.
3. Low efficiency and high cost: Some aspects of the development level of solar energy utilization are theoretically feasible and technically mature. However, some solar energy utilization devices have low efficiency and high cost. In general, the economy cannot compete with conventional energy sources. For a considerable period of time in the future, the further development of solar energy utilization will be mainly restricted by economy.