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Solar lighting systems

2021-06-30 19:05:28

Solar lighting systems are green energy lighting systems that use solar cells, which convert sunlight into electricity. Those electricities are stored in batteries for use at night. Solar lighting systems will work well only as long as the solar cells receive the manufacturer's recommended hours of sunlight.


The design of solar lights and lamps is related to the region where they are used. The relationship between the rated output power of solar cells and the input power of the luminaire is about 2 to 4:1 in East China. The specific ratio is determined by the daily working hours of the luminaire and the lighting requirements for continuous rainy days.


Solar cells installation: Many solar lamps and lights manufacturers will be placed horizontally so that the output power of solar cells will be reduced by 15% to 20%, and if a decorative cover is added on top of the solar cells, the output power of solar cells will be reduced by about 5%, solar cells are expensive, we have collected much foreign solar light information, and then between the aesthetic and energy-saving Most of them choose energy saving.


A single solar cell is generally not available, the actual application is the solar cell module. A solar cell module is a combination of multiple solar cells to achieve the desired voltage value. Solar cell module in the process of use, if another solar cell alone is shaded, such as leaves bird droppings, etc., the solar cell alone is shaded in the strong sunlight will heat damage, so the entire solar cell module damage. This is called the heat island effect. In order to prevent the heat island effect, the solar cell is generally placed at an angle so that leaves and other trees can not be attached, and in places where birds are more gathered also require the installation of an anti-bird pin.


Regardless of the style and power of solar lights and lamps, the need for a good performance of the charge and discharge control circuit is essential in order to extend the service life of the battery, it is necessary to limit its charging and discharging conditions to prevent the battery from overcharging and deep discharge, in addition, because the input energy of the solar photovoltaic power generation system is extremely unstable, the control of the battery charging in the photovoltaic power generation system than the ordinary battery charging The control of battery charging in PV power system is more complicated than that of ordinary battery charging. For the design of solar lights and lamps, success and failure often depend on the success and failure of the charge and discharge control circuit, without a good performance of the charge and discharge control circuit, it is impossible to have a good performance of solar lights and lamps.


How is the power of a solar panel calculated? Because the power of solar panels involves two variables: the size of the silicon wafer and the silicon conversion rate, so as long as we know the silicon conversion rate and the area of the silicon wafer, we can roughly calculate the power of a solar panel, the area of the solar panel silicon wafer (square millimeters) × conversion rate / 1000, for example, a length and width of 156mm solar panels, the power of a solar panel with a conversion rate of 18.5% are 156 × 156 × 0.185/1000= 4.50216w, which note that the silicon wafer area is counted when the white edge is removed. Solar panels are also very simple to calculate the number of volts, the simple voltage is 0.5V, a board consists of multiple cell versions in series together, the voltage can be added up, such as 10W12V solar panels, it is connected by 24 cells in series together, 24 × 0.5V = 12V


Solar panel glass is ultra-white fabric tempered glass, ultra-white is mainly reflected in good light transmission, the fabric is a lot of groove points on the glass, the sun's light through the groove on the fabric glass electricity refraction to achieve the most reasonable use of sunlight, glass, if you do not do the fabric treatment of power generation efficiency, will be reduced by 30%, if you do not use ultra-white not blue glass, power generation efficiency will be reduced by 10%.


 Solar panel silicon wafers from about 2003 10 ~ 11% conversion rate have been increased to the current domestic silicon conversion rate of 18-20% (polysilicon) and 20-22% (monocrystalline silicon)


 Regarding the insolation factor, it refers to the time experienced by the center of the sun from its appearance at the eastern horizon of a place to its entry into the western horizon, and its direct rays shining to the ground without any shading conditions such as ground objects and clouds and is called the insolation factor.

The instrument for measuring the sunshine hours, there are the dark cylinder type and focus type two kinds of the sunshine meter. The number of hours of sunshine is measured in hours, taking one decimal place.


Global Daily Average Sunlight Hours(H)
Country and City  Daily Average Sunlight Hours Country and City  Daily Average Sunlight Hours
Russia-Moscow 3.31 Seychelles-Victoria 6.03
Ecuador-Quito 3.91 Saudi Arabia-Mecca 6.17
Eritrea-Asmara 6.13 Sao Tome and Principe 5.14
France-Paris 3.45 St. Helena (England) 5.89
French Polynesia-Papeete 5.97 St. Kitts and Nevis Bastel 6.45
French Guiana-Cayenne 4.83 St. Lucia Castries 6.23
Vatican City-Vatican City 5.24 San Marino 4.23
Philippines-Manila 5.59 Saint-Pierre and Saint-Pierre Miquelon 3.64
Fiji-Suva 5.28 Kingston 6.48
Finland-Helsinki 3.18 Sri Lanka-Colombo 5.62
Cape Verde-Praia 6.33 Slovakia-Bratislava 3.43
Gambia-Banjul 5.89 Slovenia-Ljubljana 3.73
Congo-Brazzaville 4.65  Swaziland-Mbabane 5.18
Colombia-Santa Fe Bogota 4.87 Sudan-Kharashm 6.52
 Grenada-St. George's 6.37 Suriname-Paramaribo 5.11
Greenland (Dan) 51.44 Solomon Islands-Honiara 5.59
Georgia-Tbilisi 4.26 Somalia-Mogadishu 5.58
Cuba-Havana 5.86  Tajikistan-Dushanbe 5.1
Guadeloupe (France) 6.38 Thailand-Bangkok  5.26
Guam 6.06 Tanzania-Dar es Salaam 5.58
Kazakhstan-Almaty 4.58 Tonga-Nukualofa 5.37
Haiti-Port-au-Prince 5.64 Coburn city 6.17
Seoul in Korea 4.56 Trinidad and Tobago-Port of Spain 5.86
The Netherlands-Rotterdam 3.12 Tunisia-Tunisia 4.89
Netherlands Antilles-Willemstad 6.57 Funafuti-Tuvalu 5.31
Honduras-Tegucigalpa 5.23 Turkey-Istanbul 4.28
Kiribati-Tarawa 5.9 Turkmenistan-Ashgabat 4.96
Djibouti Djibouti 6.05 Tokelau (New) 5.45
Kyrgyzstan-Bishkek 4.36 Mata-Utu 5.38
Guinea-Conakry 5.39 Vanuatu-Port Vila 5.6
Guinea-Bissau 5.6 Guatemala 5.45
Nigeria 3.88 Venezuela-Caracas 5.68
Ghana-Accra 4.95  Brunei-Bandar Seri Begawan 5.23
 Gabon-Libreville 4.74 Uganda-Kampala 5.28
Cambodia-.Phnom Penh 5.05 Ukraine-Kiev 3.48
 Czech Republic-Prague 3.15  Uruguay-Montevideo 4.83
 Zimbabwe-Harare 6 Uzbekistan-Tashkent 5.13
 Cameroon-Yaounde 4.65 Spain-Madrid 4.87
Qatar-Doha 5.46  Western Sahara-Ayun 6.23
Moroni-Comoro 6.28 Western Samoa-Apia 5.4
Ivory Coast-Yamoussoukro 4.89 Greece-Athens 4.88
Kuwait 5.62 Sikkim-Gangtok 5.02
Croatia-Zagreb 3.87 Singapore 4.51
 Kenya-Nairobi, 6.02 New Caledonia-Noumea 5.82
Cook Islands (New) 5.38  New Zealand-Wellington 4.55
Latvia-Riga 3.18 Hungary-Budapest 3.65
 Lesotho-Maseru 6.03 Syria-Damascus 5.36
Vientiane 5.12 Jamaica-Kingston 6.25
 Lebanon-Beirut 5.68  Armenia-Yerevan 4.77
Lithuania-Vilnius 3.02 Yemen Aden 6.13
 Liberia-Monrovia 4.67 Iraq-Baghdad 5.38
Libya-Tripoli 5.37  Iran-Dheri 5.32
Liechtenstein-Vaduz 3.65 Milan-Italy  4.01
Reunion (France) 6.22 India-New Delhi 5.34
Luxemburg 3.2  Indonesia-Jakarta 4.78
Rwanda-Kigali 4.93  England-London 3.01
Romania-Bucharest 4.08 British Virgin Islands-Rhode City 6.32
 Madagascar-Antananarivo 5.9 Jordan-Amman 5.42
Maldives-Male 5.93 Vietnam-Ho Chi Minh City 5.17
 Malta-Valletta 5.74 Zambia-Lusaka 5.97

Generally speaking, we recommend that customers use polycrystalline silicon solar panels for sunlight coefficients lower than 4h, and monocrystalline silicon for sunlight coefficients higher than 4h.


Solar panels are mainly used in the practice of substandard cutting, cutting refers to a standard sheet according to the normal design does not need to be cut into too many small pieces, the results cut into many small pieces, this can be basically inferred from the solar panel suppliers to purchase the silicon wafers either the grade of goods is too poor or with a lot of edge pieces.


The tape sheet refers to the silicon wafers have lobes and then use the tape to stick into the whole piece after made into solar panels.


The installation angle needs to be made 45 degrees southwest of the angle.


Special attention is installed in the coastal solar street lights recommended that customers or hot-dip galvanized, in order to ensure that the wind level is sufficient, it is recommended that customers choose 2.5 thickness, of which 2.0 is certain to eliminate the installation in the coastal area.

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