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Working Principle of Solar LED Street Lamp

This paper introduces the in detail, and deeply analyzes the problems and solutions of each part. I believe it will be of great help to those who want to understand LED solar street lamp

1. System introduction

1.1 introduction to basic system composition

The system is composed of solar cell module (including support), LED lamp cap, control box (with controller and battery) and lamp pole; The solar panel has a light efficiency of 127wp / m2, which is very beneficial to the wind resistance design of the system; The lamp cap part is composed of 1W white LED large particles or white LED small particles, which are integrated on the printed circuit board and arranged into a lattice with a certain spacing as the plane light source.

The control box is made of stainless steel, beautiful and durable; Maintenance free lead-acid battery and charge discharge controller are placed in the control box. The valve regulated sealed lead-acid battery is selected for the system. Because it has little maintenance, it is also called "maintenance free battery", which is conducive to reducing the maintenance cost of the system; The design of charge discharge controller takes into account the complete functions (including optical control, time control, overcharge protection, over discharge protection and reverse connection protection) and cost control, so as to achieve high cost performance.

1.2 introduction to working principle

The working principle of the system is simple. The solar cell made by using the principle of photovoltaic effect receives solar radiation energy and converts it into electric energy output during the day. It is stored in the battery through the charge discharge controller. At night, when the illumination gradually decreases to about 10lux and the open circuit voltage of the solar cell panel is about 4.5V, the charge discharge controller acts after detecting this voltage value, The battery discharges the lamp cap. After the battery is discharged for 8.5 hours, the charge discharge controller acts and the battery discharge ends. The main function of charge discharge controller is to protect the battery.

2. System design idea

Compared with general solar lighting, the basic principle of LED solar street lamp design is the same, but more links need to be considered. The following will take the solar LED high-power street lamp of Hong Kong zhenmingli Group Co., Ltd. as an example and analyze it in several aspects.

2.1 solar cell module selection

Design requirements: in Guangzhou, the load input voltage is 24V, the power consumption is 34.5w, the working hours are 8.5H per day, and the continuous rainy days are guaranteed for 7 days.

(1) the average annual radiation in Guangzhou in recent 20 years is 107.7kcal/cm2. After simple calculation, the peak sunshine hours in Guangzhou are about 3.424h;

(2) daily load power consumption = = 12.2ah

Here, the design minimum number of days between two consecutive rainy days is 20 days, 1.05 is the comprehensive loss coefficient of solar cell module system, and 0.85 is the charging efficiency of battery.

(4) minimum total power of solar modules = 17.2 5.9 = 102W

Standard battery modules with peak output power of 110wp and single 55wp shall be selected to ensure the normal operation of street lamp system in most cases of a year.

2.2 battery selection

The calculation of battery design capacity is simpler than the peak wattage of solar modules.

According to the above calculation, the daily power consumption of load is 12.2ah. When the battery is full, it can work continuously for 7 cloudy and rainy days, plus the first night's work, the battery capacity is:

twelve point two (7 1) = 97.6 (ah), two 12V100AH batteries can meet the requirements.

2.3 solar cell module support

2.3.1 inclination design

In order to make the solar cell module receive as much solar radiation as possible in a year, we should choose an optimal inclination angle for the solar cell module.

The discussion on the optimal inclination of solar cell modules has appeared in some academic journals in recent years. The street lamp is used in Guangzhou. According to the data in relevant documents [1] in this design, the inclination of solar cell module support is selected as 16O.

2.3.2 wind resistance design

In the solar street lamp system, a structural problem that needs to be paid great attention to is the wind resistance design. The wind resistance design is mainly divided into two parts: one is the wind resistance design of battery module support, and the other is the wind resistance design of lamp pole. The following analysis is made according to the above two parts.

(1) wind resistance design of solar cell module support

According to the technical parameter data of the battery module manufacturer, the upwind pressure that the solar cell module can withstand is 2700pa. If the wind resistance coefficient is selected as 27m / S (equivalent to level 10 typhoon), according to inviscid hydrodynamics, the wind pressure borne by the battery module is only 365pa. Therefore, the module itself can withstand the wind speed of 27m / s without damage. Therefore, the key to be considered in the design is the connection between the battery module support and the lamp post.

In the design of this set of street lamp system, the connection between the battery module support and the lamp pole is designed to be fixed and connected with a bolt rod.

wind resistance design of street lamp pole

The parameters of street lamps are as follows:

Inclination of battery panel a = 16O, lamp pole height = 5m

Design and select the weld width at the bottom of the lamp post = 4mm lamp pole bottom outer diameter = 168mm

Working Principle of Solar LED Street Lamp 1

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