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Horticutral Lighting
The working principle of solar LED street light is to convert solar energy into electric energy so as to realize lighting. Photovoltaic modules made of polycrystalline silicon absorb solar energy and convert it into electric energy during the day, and then store the electric energy in the battery under the control of photovoltaic controller. When night falls or the light intensity around the lamps is low, the electric energy stored in the battery provides power for led street lights through the control of photovoltaic controller. To put it simply, solar LED street lights are mainly composed of the following parts: solar panels, controllers, batteries, led street lights.
solar panel
Photovoltaic module (solar panel) is the core part of photoelectric conversion, as well as one of the key components in solar LED street lights. Its job is to convert solar energy into electric energy. Among many solar panels, there are three more common and practical- monocrystalline silicon solar panels, polycrystalline silicon solar panels and amorphous silicon solar panels.
The production process of polysilicon solar panels is relatively simple. The performance parameters of monocrystalline silicon solar panels are relatively stable. As regions vary, the applicable solar panels may be different. It is recommended to use polysilicon solar panels in the areas with abundant sunlight. On the contrary, In the region where there are more cloudy and rainy days and the sun is not relatively enough, it is recommended to use monocrystalline silicon solar panels.
Solar panel is to connect a number of single solar cells, and encapsulating, and then constitute different sizes, different powers of solar cell modules, also known as solar panels. Generally single solar cell is not usable. What actually applied is the solar panel.
At present, the encapsulating forms of solar cells mainly include laminating process and adhesive dropping process. The solar cells encapsulated by laminating process can guarantee the working life of more than 25 years, and its technological characteristics and service life are better than the encapsulating form of adhesive dropping.
Peak power (WP) of solar panel is the maximum power output of solar panel under standard conditions. The output power of solar panel depends on solar illumination, solar spectral distribution and operating temperature of solar panel. The output power of the same solar panel is different At different times and in different places. The choice of solar panel output power need to be determined according to the power of solar led street lights, use time and local climatic and geographical conditions.
In the current application of led solar street light, the installation of solar panel is tilted whether the street light and the solar panel are separated or integrated (that is people often say separated solar led street light and integrated solar led street light ). This is because in the process of using solar panels, if a certain area of the panel is covered by leaves and other cover objects for a long time. The single solar cell in the shielded area will be damaged due to heat under strong sunlight, and may even cause damage to the entire solar panel. This phenomenon is known as the heat island effect. Tilting installation of solar panel, making it difficult for the surface to adhere to shielding items, can prevent the heat island effect in an effective way.
controller
For any solar led street light system, the control circuit quality of charging and discharging will directly affect the success and failure of system application. Regardless of the power of solar led street light, a charging and discharging controller of good performance is essential. In order to prolong the service life of the battery, it is necessary to limit its charging and discharging conditions to prevent the battery from overcharging and overdischarging. In places where there is a large temperature difference, the qualified controller should also have the function of temperature compensation. At the same time, people also hope to integrate some smart control functions of street lights into controller, such as light-control function, time-control function and the control function of automatically switching the electric energy load at night. Thus the whole control system structure is simplified, the cost is saved, and the control of solar led street light system is more flexible and intelligent.
In addition, the photovoltaic controller should also have short circuit protection, reverse connection protection and other protection functions as well as maximum power tracking function. Using the maximum power tracking function enables the battery module to intelligently output maximum power at different temperatures and different solar radiation conditions, thus making the solar photovoltaic system run more efficiently.
battery
The amount of electric energy stored in the battery in a solar street lamp system is directly provided by the solar panel. And the energy generated by solar panels is very uncertain due to labile external factor. It is required to configure battery of reasonable capacity and reliable performance so as to ensure the normal work of the solar led street light system.
In solar led street lighting system, maintenance-free, fully sealed battery is generally preferred. That’s because such a battery is featured with high discharge rate,stable performance, easy for installation and small occupied volume. There is no need to add water. You can install it at your will whether it’ horizontal or vertical.And the serve life is generally longer, 5-7 years.
The general principle for selecting battery capacity is to meet night lighting needs first, and second to store as much energy as possible from the solar panel during the day, while also to meet the electrical energy needed for continuous cloudy and rainy night lighting. Battery capacity should not be too large or too small. If the battery capacity is too small, it is difficult to meet the needs of night lighting. If too large, the battery will be in a state of power deficit for a long time, resulting in shortened battery lifetime. It will increase the cost of the whole solar led street light system, waste unnecessary investment .
Generally, the basic requirements regarding to battery for solar led street lights are as follows:
1) low self-discharge rate;
2) long serve life ;
3) strong capacity of deep-discharge ;
4) high charging efficiency ;
5) less maintenance or no maintenance;
6) wide operating temperature range;
7) low price .
led street light
What follows is the most important part of solar led street light system-led street light. all three parts above are all in service of led street light .
A key point for solar panels to power LED street lights is that the current converted by solar energy is DC, and the working current of LED street lights is also DC. The two types of current match so coincidentally, making the whole lighting system achieve high energy efficiency, high safety and reliability, and realizing the unification of energy saving, environmental protection, safety and efficiency.
Whether it is separated solar street light or integrated solar street light, have their own unique. The following is an excellent separated solar street light.
1) a compact size, smooth and simple design, 20W/30W optional.
2) high lighting efficiency up to 150lm/W
3) 360° horizontally adjustable, also ±60°elevation angle adjustable, makes the solar panel freely adjusted accordingly to sunshine direction, to get the best position to store solar energy. Greatly improve charging efficiency.
4) premium solar panels , quick charge .
5) it can be is independent of the utility grid.
6) separated design, if any part fails to work, just need to replace this part.
7) without external wires, the risk of accidents are minimized.
8) solar powered, no-pollution, environmentally friendly.
9) on successive rainy days, implement stepped lighting scheme, ensure working last 7 days without worry .
10) 5 working models available , meet the requirements of different seasons and various weather
11) horizontal mounting , vertical mounting , Y-pole mounting optional
12) and more
It mainly used for the following occasions
1) rural street
2) park
3) industrial park
4) holiday resort
5) parking lot
6) remote areas without power grid
7) single lane
8) city parks
9) residential area
10) green area outside the building
11) campus
12) outdoor sports field etc
