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Solar energy is quite simply the energy produced directly by the sun and collected elsewhere, normally the Earth. The sun creates its energy through a thermonuclear process that converts about 650,000,000 tons of hydrogen to helium every second. The process creates heat and electromagnetic radiation. The heat remains in the sun and is instrumental in maintaining the thermonuclear reaction. The electromagnetic radiation (including visible light, infra-red light, and ultra-violet radiation) streams out into space in all directions.

Only a very small fraction of the total radiation produced reaches the Earth. The radiation that does reach the Earth is the indirect source of nearly every type of energy used today. The exceptions are geothermal energy, and nuclear fission and fusion. Even fossil fuels owe their origins to the sun; they were once living plants and animals whose life was dependent upon the sun.

Much of the world's required energy can be supplied directly by solar power. More still can be provided indirectly. The practicality of doing so will be examined, as well as the benefits and drawbacks. In addition, the uses solar energy is currently applied to will be noted.

Due to the nature of solar energy, two components are required to have a functional solar energy generator. These two components are a collector and a storage unit. The collector simply collects the radiation that falls on it and converts a fraction of it to other forms of energy (either electricity and heat or heat alone). The storage unit is required because of the non-constant nature of solar energy; at certain times only a very small amount of radiation will be received. At night or during heavy cloudcover, for example, the amount of energy produced by the collector will be quite small. The storage unit can hold the excess energy produced during the periods of maximum productivity, and release it when the productivity drops. In practice, a backup power supply is usually added, too, for the situations when the amount of energy required is greater than both what is being produced and what is stored in the container.

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                           Monocrystalline Solar Panel                                                Polycrystalline silicon solar panels

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Type SN-S120W Solar Panel
Maximum Power 120W
Maximum Power voltage 18V
Maximum Power current 6.67A
Open circuit voltage 21.16V
Short circuit current 7.07A
Cell efficiency 15.13%
Module efficiency 13.03%
size of modul 1350×808mm×35
Frame Material Alloy frame,46mmTH
number of cells 36pcs
size of cells 125mm×125mm
Weight per piece (Kg) 15kg
type of junction box PV
cable type and length connector typ PV cable, 0.9m, Plug and socket
maximum system voltage 1000V
Temperature coefficient of Isc +0.1%/℃
Temperature coefficient of Voc -0.38%/℃
Temperature coefficient of power -0.47%/℃
Temperature coefficient of Im +0.1%/℃
Temperature coefficient of Vm -0.38/℃
Nominal operating cell temperature 47℃(+2℃)
Wind Bearing 60m/s(200kg/sq.m)
Impact Resistance Hail Impact Test 227g steel ball fall down from 1m height
Quality guarantee CE、TUV,3 years products warranty and 25 years 80%of power
FF 68%---72%
Tolerance Wattage(e.g.+/-3%) +/-5%
Surface maximum load capacity 60m/s
Output tolerance +/-5%
Standard test conditions AM1.5 100mw/cm²

 

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