Solar energy is the most direct and most common and cleanest energy on the earth. As a huge amount of renewable energy, solar energy reaches the surface of the earth. The radiant energy is about 250 million barrels of oil per day. It can be said that it is inexhaustible and not used. exhaust. The spectrum of LEDs is almost entirely concentrated in the visible light band, so the luminous efficiency is high. Most people think that energy-saving lamps can save 4/5 energy is a great initiative, but LEDs are more energy-efficient than energy-saving lamps. This is a solid light source. reform.
Solar LED lighting integrates the advantages of solar and LED.
1. Introduction and working principle of solar LED lighting system
The system consists of a solar cell module part (including a bracket), an LED lamp head, a control box (with a controller, a battery) and a light pole; the solar panel has a luminous efficiency of 127 Wp/m2, and the efficiency is high, and the system is resistant to wind. The design is very advantageous; the lamp head portion is a planar light source with a 1W white LED and a 1W yellow LED integrated on a printed circuit board and arranged at a certain pitch.
The control box body is made of stainless steel, which is beautiful and durable. The maintenance-free lead-acid battery and charge and discharge controller are placed in the control box. This system uses valve-regulated sealed lead-acid battery. Because it has little maintenance, it is also called “maintenance-free batteryâ€, which is conducive to the reduction of system maintenance cost. The charge and discharge controller is designed with both functions in mind (with light) Control, time control, overcharge protection, over discharge protection and reverse connection protection, etc.) and cost control, achieving high cost performance.
The working principle of the system is simple. The solar cell made by the solar photovoltaic effect principle receives solar radiant energy and converts it into electric energy output. The battery is stored in the battery through the charge and discharge controller. At night, the illuminance gradually decreases to about 101ux, and the solar cell The open circuit voltage of the board is about 4.5V. After the charge and discharge controller detects this voltage value, the battery is discharged to the lamp head. After the battery is discharged for 8.5 hours, the charge and discharge controller operates and the battery discharge ends. The main function of the charge and discharge controller is to protect the battery.
2, solar LED lighting system design ideas
2.1 Solar cell component selection
Design requirements: Guangzhou area, load input voltage 24V power consumption 34.5W, working hours 8.5H per day, to ensure continuous rainy days 7 days.
(1) The average annual radiation dose in Guangzhou in the past 20 years is 107.7Kcal/cm2, and the peak sunshine hours in Guangzhou are about 3.424H.
(2) Daily power consumption of the load = 12.2AH
(3) The total charging current of the required solar modules = 1.05 × 12.2 × ÷ (3.424 × 0.85) = 5.9A
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