The mankind started the button of industrial revolution at the beginning of the 18th century, begin to come by way of consuming a large number of petrochemical industry energy, support the sustainable development of the industrial economy, result in abusing various kinds of resources , make the ecological environment destroy seriously. Generally realize in the whole world, the mankind must be giving consideration to the development in economy (Economic Growth) And must mediate each other in the environmental protection (Environmental Protection ) and 3E tactics of obtaining sufficient and steady energy (Energy Security ), could be possible to continue development forever. And in Kyoto Protocol (Kyoto Protocol ) of 1997, the common understanding information expressed in the outline convention of the climate of the United Nations (UNFCC ), have already sketched the contours of the existence subject that the mankind should face seriously clearly.

Solar energy constant: The earth reach the sun average from 1.495x10⁸ kilometer , in absorption and in disorder place of atmosphere of having, become the vertical place 1cm² radiation energy of the sun received of one minute with the incidence direction. Its quantity is 135.3mW/cm² =1.353kW/m² . Its original density of radiation is about 1.4kW/m², this is a solar energy constant. This is surveying value which uses the satellite.
Solar energy energy is in the distribution of the energy on the surface of the earth, can divide into the following several kinds : About 30% of energy (52x102 kW ) is reflected to the space again in the form of light, sees the earth from the spaceship, because have good sea level of person who reflect, have what earth of cloud seem very blue. Though their may up to the the earth surface to 70%, about 47% among them is become directly hotly, enables the temperature to keep, about 23% are accumulated in the sea water or the ice , among them a part is cooked and evaporated for water into the energy of the cloud or the rain. Only accounts for 0.2% with wind , wave and convection of mankind's direct relation ,etc. with its energy in the energy , invite 0.37X10¹²kW. And use the persons who grow up of animals and plants on the earth, namely living beings of the so-called photosynthesis can, only about 0.02%, is about 400X10⁸kW. However, the friend's important relation of keeping to the earth environment of energy of this.
Must through nearly 300 million years coal that can form, but only in several hundred years nearby totally mankind.
In this ecosystem, the mankind creates the use of the tool and fire with intelligence, take the place of and hand in bearing via the city, make the living environment improved, this is a civilized origin, the marvellously most quick electronic engineering that especially progress in modern times, born and regard electric crystal as the solid state electrons of the centre , passed the communication , traffic , industry and even development to space science and technology, have formed the highly informationalized society. In addition, open the era of using the nuclear energy on the energy, all these let people have comfortable civilization every day. However, in the extremely rapidly progressive economic civilization here, as regards ecological view, it is really to a great great calamity . Or since the dawn of human civilization, kerosene accumulated by the sun energy and stone carbon fuel, invent steam engine to nearly totally burnt in less than 300 years in watt. And, because the chemical reaction burnt makes the atmosphere polluted, acid rain and accumulation of the carbon dioxide cause the greenhouse effects phenomenon.

The mankind started the button of industrial revolution at the beginning of the 18th century, begin to come by way of consuming a large number of petrochemical industry energy, support the sustainable development of the industrial economy, result in abusing various kinds of resources , make the ecological environment destroy seriously. Generally realize in the whole world, the mankind must be giving consideration to the development in economy (Economic Growth) And must mediate each other in the environmental protection (Environmental Protection ) and 3E tactics of obtaining sufficient and steady energy (Energy Security ), could be possible to continue development forever. And in Kyoto Protocol (Kyoto Protocol ) of 1997, the common understanding information expressed in the outline convention of the climate of the United Nations (UNFCC ), have already sketched the contours of the existence subject that the mankind should face seriously clearly.

1.The solar cell can change the light energy into the direct current (not store energy ) directly.
2.Do not need fuel , have no offal with pollute , not rotate the package and noise.
3.The life-span of the solar cell can be up to more than 20 years for a long time.
4.The size of appearance can be changed at will, use the extensive (small products to consume --Such as the calculator, it is large to the power plant ).
5.The size of generation changes with intensity of sunlight , the deficiency of the peak electricity that can be auxiliary (connecting in parallel type).
6.Design hot or half a completely mere template in order to separate radiation , can combine with the building.

1、hold the electric system independently:
Store to and bind it in the battery group via the control circuit the electricity emerging in sunlight in the daytime , look at and need to change the flowing device via going against again, change the direct current in the battery into the alternating current, the supplying power device is used.

http://solarpv.itri.org.tw/performance/demo.asp