Solar LED lighting principle and technology of detailed analysis - (AddTime ： 2013-01-17)

Solar energy is the most direct, the most common is the most clean energy, solar energy as the one kind of huge amount of renewable energy to the surface of the earth, and every day the radiant energy equivalent to about 250 million barrels of oil, it can be said is mine, unlimited. LED spectral almost all focus on the visible light range, so high luminous efficiency, the average people think, energy-saving lamps can be energy-saving 4/5 is a great pioneering undertaking, but LED energy-saving lamps and energy saving than 1/4, this is a solid light sources more great reform.

Solar led lighting integrated the advantages of solar energy and led.

1, solar 200W led Flood light system introduction and working principle System consists of solar cell module part (including support), 200W led Flood light holder, control box (containing controller, battery) and lamp post a few components; Solar panels efficacy reached 127 wp/m2, high efficiency, the system of wind design is very advantageous; Lamp holder of 1 w white light LED and 1 w yellow LED integrated in printed circuit board ranks as a certain space lattice as plane luminous source. The control box with stainless steel for material, attractive and durable; Control the place free maintenance lead-acid battery and charging and discharging controller. The system chooses control valve sealed lead acid battery, because of its maintenance are very few, so it is also called "free maintenance battery, be helpful for system maintenance cost reduced, charge and discharge controller on the design to complete the function (have controlled, time control, overcharge protection, discharge protection and reverse connect protection, etc.) and cost control, realize high performance-to-price ratio. The system working principle is simple, use light born V effect principle of solar cell is made during the day the sun radiant energy received solar panels and converting it into electricity output, after stored in the storage battery charging and discharging controller, night when illumination gradually reduced to 101 ux of the left and right sides, solar panels open circuit voltage of 4.5 V or so, charge and discharge controller to detect the voltage value after action, battery to discharge lamp holder. Battery discharge 8.5 hours, charge and discharge controller action, battery discharge end. Charge and discharge controller main function is to protect the storage battery.

2, solar 200W led Flood light system design thought

2.1 solar cell module selection
Design requirement: guangzhou area, load input voltage 24 v power consumption 34.5 W, every day working hours 8.5 H, ensure continuous rainy days 7 days. (1) guangzhou in recent twenty years at an average of 107.7 Kcal/cm2, the simple calculation guangzhou peak sunshine time is about 3.424 H;
(2) load day power consumption = 12.2 AH
(3) solar energy components needed for the total charging current = 1.05 by 12.2 by ÷ (3.424 x 0.85) = 5.9 A Here, two consecutive rainy days the design between the shortest days for twenty days, 1.05 for solar cell module system comprehensive loss coefficient, 0.85 for battery charging efficiency. (4) solar energy components at least total power number = 17.2 by c = 102 w
Choose peak output 110 wp, single piece of 55 wp standard cell components, should be able to ensure that street lamp system in a year in most cases of normal operation.

2.2 battery selection

Battery design capacity calculation compared to solar component peak wattage simple.
According to the above calculation know, load day power consumption 12.2 AH. In the battery is full of cases, can work continuously 7 day of overcast and rainy, plus the first night work, battery capacity:
12.2 by (7 + 1) = 97.6 (AH), choose 2 table 12 v100ah battery can meet the requirements.
2.3 solar cell module support design
2.3.1 Angle design
In order to make solar cell module in a year to receive the solar radiant energy as far as possible, we will make solar cell module should select a best Angle.
About solar module best Angle question discussion, the street lamp used in guangzhou area, select solar module support Angle for 16 degrees.
2.3.2 patch notes solar 200W led Flood light system design of wind resistance
In the solar street light system, structure on a need to attach great importance to the problem is the wind resistance design. Wind design mainly divided into two parts, one for the battery module support wind resistant design, secondly the lamp-post wind resistance design. According to the above two pieces do analysis respectively.

(1) solar cell module support wind resistant design According to the battery module manufacturers of technical parameters material, solar cell module to be accepted into the wind pressure for 2700 pa. If wind coefficient selected for 27 m/s (equivalent to ten level typhoon), according to the viscous fluid mechanics, battery components under wind only 365 pa. So, the component itself is can withstand 27 m/s wind speed and not damaged. So, the design of the key to consider is the battery module of the support and the connection of lamp post. In this set of street lamp system design battery components support and lamp post link design using bolt bar permanent connection.

(2) the street lamp post wind resistance design Street lamp parameters are as follows: Panels dip A = 16 ° lamp post height = 5 m Design selection at the bottom of the lamp post weld width δ = 4 mm lamp post bottom diameter = 168 mm Weld the surface namely lamp post failure surface. Lamp post failure surface resistance moment W calculation point p to lamp post by panels action load F action line distance for pQ = [5000 + (168 + 6)/tAn16 °] × Sin16 ° = 1545 mm = 1.545 M. So, the wind load in the lamp post failure surface role moment M = F x 1.545. According to 27 m/s design maximum allowable wind speed, 2 x 30 w double lamp solar street light panels are made of the same basic load for 730 n. Considering the safety factor of 1.3, F = 1.3 x 730 = 949 n. So, M = F x 1.545 = 949 * 1.545 = 1466 n. M. According to the mathematical deduction, circular failure face resistance moment W = π... (3 r2 δ + 3 r δ 2 + δ 3). The type, r is circle diameter, δ is ring width. Failure surface resistance moment W = π... (3 r2 δ + 3 r δ 2 + δ 3) = π... (3 x 842 x 4 + 3 by 84 x 42 and 43) = 88768 mm3 = 88.768 x 10-6 m3 Wind load on the damage effect caused by the moment stress = M/W = 1466 / (88.768 x 10-6) = 16.5 x 106 pa = 16.5 MpA "215 MpA Among them, 215 mpa is Q235 steel bending strength. So, the design selected weld width meet the requirements, as long as the welding quality can guarantee, lamp post of wind is no problem. 2.4 solar 200W led Flood light system controller Solar charge and discharge controller main function is to protect the storage battery. The basic function must have the overcharge protection, discharge protection, control and time control and counter-attack joint, etc. Battery overcharge protection, discharge protection voltage general parameters such as table 1, when the battery voltage to the set value and change the state of the circuit. In selecting device, there is by single chip microcomputer, also have the comparator, plan more, have their own characteristic and advantage, should according to the customer demand characteristics selected corresponding solutions, this is differ a detail. 2.5 solar 200W led Flood light system surface treatment This series of products using the electrostatic coating new technology to Fp professional building materials coating is given priority to, can satisfy the customer to product surface color and environmental harmony, and at the same time, the requirements of the products from clean sex is high, corrosion resistance, ageing resistance, suitable for any weather environment. Process design for hot-dip zinc coating on the basis of, make the product performance greatly improved, to the most stringent AAMA2605.2005 requirements, other indicators have reached or exceed the requirements of GB.

3, concluding remarks The overall design basically considered each link; Photovoltaic component peak wattage type design and selection of the battery capacity was designed with the most general design methods, design thought is science; Wind from the battery module design of the support and lamp post two pieces of do the analysis, analysis of comprehensive; Surface treatment adopted the most advanced technology; Street lamp overall structure simple and beautiful; Through practical operation of each link that match between the gender is good. At present, solar 200W led Flood light of the initial investment is still the problem with one of our main problem. However, solar battery efficacy in gradually increase, but the price will be gradually reduced, the same cities LED efficacy in rapidly improved, and prices are lower. And solar renewable, clean pollution-free and LED the environmental protection and energy saving, compared to conventional fossil energy is nervous, and use to the environment will cause the increasingly serious pollution. So, solar 200W led Flood light as a kind of burgeoning outdoor lighting, show our will is infinite vitality and broad prospects.