Solar energy is the most direct and on Earth in general is the most clean energy, solar energy as a huge amount of renewable

energy, every day to achieve the radiant energy of the Earth s surface is approximately equal to 2.5 of hundreds of millions of

barrels of oil, it can be said to be inexhaustible, used not dried up. LED spectrum almost all concentrated in the visible light

spectrum, so the high luminous efficiency, and most people agree that energy-saving lamps can save 4/5 is a great initiative, but

also energy saving lamp LED than 1/4, this is a solid light source is greater reform.

The solar LED lighting integrated the advantages of solar energy and LED.

1, the system

1.1 system, the basic composition of the Introduction

System consists of a solar cell battery

The battery is an energy conversion and storage devices, by reflecting the chemical or physical energy into electrical energy. The

battery is a chemical power, which consists of two different components of the electrochemical activity of electrodes composed of

positive and negative poles, respectively, soaked and then can provide the media the conduction of the electrolyte, when connected

to an external vector by converting its internal chemical able to provide electricity. Component parts (including stents), LED

lamp, the control box (controller, battery) and the light pole a few parts; solar panel light efficiency 127Wp/m2, efficient,

wind-resistant design of the system is very favorable ; lamp part of a 1W white LED and 1W yellow LED integrated in the printed

circuit board arranged in a certain spacing of the lattice as a planar light source.

Control box casing of stainless steel material, beautiful and durable; control box placed on the maintenance-free lead-acid

batteries and the charging and discharging controller. The system selected VRLA batteries, because of its minimal maintenance, it

is also known as "maintenance-free battery, system maintenance costs reduced; charge and discharge controller is designed to take

into account the full-featured (with light control, time control, overcharge protection, over discharge and reverse polarity

protection, etc.) and cost control to achieve a very high price.

1.2 works

The system is simple in principle, the use of the photovoltaic effect of the principle of solar cells made during the day solar

panels to receive solar radiation into electrical energy output after charge and discharge controller is stored in the batteries

at night when the illumination is gradually reduced to about 101ux, solar cells board open-circuit voltage of about 4.5V, the

charge and discharge controller detects this voltage value after the action, the discharge of the battery on the lamp. 8.5 hours

of battery discharge, charge and discharge controller action, the end of the battery discharge. The charge and discharge

controller s main role is to protect the battery.

2, the system design ideas

The design of solar street lights and solar lighting, the basic principle is the same, but need to be considered part of more. The

following will be the Hong Kong and the Neo-Neon Holdings Limited This Solar LED street light for example, the analysis done in

several ways.

2.1 solar cell component selection

The design requirements: the Guangzhou area, load the input voltage of 24V power consumption of 34.5W, daily working hours 8.5H,

to ensure that the number of days to 7 days of continuous rain.

The ⑴ Guangzhou region nearly two decades the average annual amount of radiation 107.7Kcal/cm2, by simple calculation of peak

sunshine of the Guangzhou area, the number is about 3.424H;

⑵ load power consumption = 12.2AH

⑶ required solar component of the total charge current = 1.05 × 12.2 × ÷ (3.424 x 0.85) = 5.9A

Here, two successive shortest days of the design between the number of rainy days is 20 days, 1.05 for the solar cell module

system loss coefficient, 0.85 for the battery charging efficiency.

(4) solar modules, the minimum total power = 17.2 × 5.c = 102W

Choice of peak output power 110Wp, a single block of the 55Wp the standard battery components, should be able to guarantee the

normal operation of street lighting system, in most cases a year.

2.2 The battery selection

Peak wattage battery design capacity of the calculation compared to the solar modules should be simple.

Know that according to the above calculation, the load power consumption 12.2AH. Case the battery is full, you can work

continuously seven rainy days, plus the first night, the battery capacity:

12.2 × (7 + 1) = 97.6 (AH), selected 2 12V100AH ??battery to meet the requirement.

2.3 solar modules bracket

2.3.1 inclination Design

To allow solar modules to solar radiation received during the year as much as possible, we want to select an optimum tilt angle

for solar modules.

Discussion on the optimum tilt angle of the solar modules, in a number of academic journals in recent years too many. The street

lights use areas for the Guangzhou area, refer to the information in the literature [1] based on the design, selected solar

modules bracket inclination of 16 degrees.