Solar power generation is a kind of renewable new energy. It uses the principle of photovoltaic effect to directly convert solar energy into electrical energy. At present, a large number of development and applications have been achieved in my country.
LED light source is a new type of energy-saving, environmentally friendly and efficient lighting source. It is made by using the principle that light-emitting diodes made of different materials can emit different colors of light after being energized. , Inefficient traditional light source, has been widely used in the field of lighting.
The solar LED street light replaces the traditional mains power supply with solar energy, and replaces the traditional high-pressure sodium light source with LED light source.
Solar LED street lights have been applied in some fields. We can see solar LED street lights on the roads of some cities or villages and towns, but they have not replaced all road lighting and have not been widely promoted in cities and towns. Why?
Let"s analyze the reasons why solar LED street lights, as green, environmentally friendly and energy-saving road lighting equipment, have not been widely promoted and applied in cities and towns:
1. The radiation intensity of sunlight in some cities and towns is not enough, and there are many cloudy and rainy days, which cannot meet the charging requirements of solar street lamps.
my country has a vast territory, and the geographical location, climate and weather, solar radiation intensity, atmospheric thickness (that is, atmospheric quality), topographic features and other factors and conditions of various cities and towns are different. The sunshine resources of different regions vary greatly. The power generation system is only effective in areas with abundant solar energy resources.
The total solar radiation resources in my country are generally distributed in "the plateau is larger than the plain, and the dry area in the west is larger than the humid area in the east". Among them, Qinghai, Inner Mongolia, Ningxia, Shanxi and other regions are relatively rich, while eastern Sichuan, most of Chongqing, central and northern Guizhou, Regions such as western Hubei and northwestern Hunan are relatively barren.
In areas with relatively poor total solar radiation resources, there are often more cloudy and rainy days. In the rainy season, solar street lights are almost unusable.
Second, the initial investment of solar LED street lights is relatively large
Ordinary solar LED street lights are mainly composed of LED light sources, lamps, light poles, foundations, etc.; and solar LED street lights need to be equipped with solar panels, solar LEDs, in addition to the LED light sources, lamps, light poles, and foundations required for general road lighting. The structure and foundation of solar power generation equipment such as street light controllers, batteries, and solar street light poles are also more complicated than ordinary LED street lights. Therefore, the cost of a set of solar LED street lights is several times that of ordinary LED street lights.
Urban road lighting is divided into three levels: main road, secondary road and branch road. Among them, the main road and secondary road are relatively wide, and the power of the LED street lamps used is about 200W. In order to ensure that the solar street lamps can still be used in rainy weather To continue lighting, it is necessary to configure larger-capacity solar panels and batteries, which are more expensive.
Third, the later maintenance cost of solar LED street lights is relatively high
Solar street lights reduce energy consumption and improve energy utilization efficiency through solar power generation and LED light sources, thereby saving electricity and reducing electricity costs. However, the service life of the battery in the solar LED street light is only about 5 to 7 years, and the control and management of charge and discharge are high; in addition, the country has no perfect and unified standard for the solar LED street light system, and each manufacturer produces according to its own standards. They are not interchangeable, so regular replacement of batteries requires the purchase of a large number of different spare parts and spare parts, resulting in relatively high maintenance costs in the later period.
The electricity cost reduced by solar power generation and LED light source is not enough to make up for its initial investment and later maintenance costs.
Fourth, solar LED street lights are greatly affected by the surrounding environment
In recent years, many cities and towns in our country have done a good job in urban road greening, and the street trees on both sides of many municipal roads are tall and dense; in addition, the land is now tight, and many urban municipal roads are densely covered with high-rise buildings on both sides. Tall and dense trees and buildings will adversely affect the radiation intensity and irradiation time of sunlight, which will affect the normal use of solar LED street lights.
5. Adopting the "mains power + solar energy" LED street light mode, the initial investment is larger
In order to solve the problems of insufficient radiation intensity, short irradiation time, and inability to use pure solar LED street lights, many towns consider adopting the "mains + solar" LED street light mode instead.
The use of "mains + solar" LED street lights can improve the use effect of solar LED street lights and ensure that road lighting can remain unaffected by weather, surrounding trees and other environments, but its initial investment includes mains investment and solar LED street lights. The investment is a double investment, the initial investment is larger and the maintenance cost is higher.
Six, solar LED street lights are difficult to meet the electricity demand of other municipal facilities
At present, with the continuous advancement of urban intelligence and the increase of urban vegetation green space year by year, many other municipal facilities (such as smart light poles, self-service charging piles, smart bus booths, traffic lights, public security monitoring equipment, communication base stations, platform advertisements, landscape lighting, vegetation sprinkler irrigation, etc.). The capacity of solar panels, batteries, etc. in solar LED street lights is generally configured according to the capacity of road lighting fixtures. Generally, it can only meet the lighting power demand of LED street lights themselves, and it is difficult to meet the power demand of other municipal facilities on municipal roads.
7. Suitable places for solar LED street lights
According to the above analysis, the use of solar LED street lights has certain requirements for the environment, and it is more suitable for richer solar energy resources (compared to the northwest region, etc.) Urban roads and places where the reliability of power supply is not high, the trees and buildings around the road are not dense, and it is difficult to obtain mains power.