Relative limitations of LED solar street lights

Everyone knows that LED solar street lights have many advantages, energy saving, environmental protection, and solving energy crisis, but they do not know 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 average solar energy received on an area of u200bu200b1 square meter perpendicular to the direction of sunlight is about 1,000W; if you press The average day and night throughout the year is only about 200W. In winter, it is only about half, and it is generally only about 1/5 on cloudy days. 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, geographical latitude and altitude, as well as the influence of random factors such as sunny, cloudy, cloud, and rain, the solar irradiance that reaches a certain ground It is both intermittent and extremely unstable, which makes the large-scale application of solar energy more difficult. 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, it is necessary to solve the problem of energy storage, that is, to store the solar radiation energy during the sunny day as much as possible for night or rainy It is used every day, 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.