A Solar Panels Design is a device that responds to light and converts light energy into electricity. There are many kinds of materials that can produce photovoltaic effect, such as monocrystalline silicon, polycrystalline silicon, amorphous silicon, gallium arsenide, selenium and other copper. Their power generation principle is basically the same, now crystal silicon as an example to describe the photovoltaic power generation process. P-type crystalline silicon doped with phosphorus can be N-type silicon, the formation of P-N junction.
When the light is irradiated on the surface of the Solar Panels Design, a part of the photons are absorbed by the silicon material; the energy of the photon is transferred to the silicon atoms so that the electrons are transitioned and the free electrons are formed on both sides of the PN junction to form a potential difference. When the external circuit is turned on , In the role of the voltage, there will be a current flowing through the external circuit to produce a certain output power. The essence of this process is the process of converting photon energy into electrical energy.
Solar power generation There are two ways of solar power: one is light → heat → electricity conversion; the other is the light → direct conversion mode.
(1) light → heat → electric conversion method: through the use of solar radiation generated by heat, usually by the solar collector will absorb the heat into the refrigerant refrigerant, and then drive the turbine power generation. The previous process is the light → heat transfer process; the latter process is hot → electrical conversion process, as with ordinary thermal power generation. The shortcomings of solar thermal power generation are inefficient and costly.
(2) light → electrical direct conversion: the way is the use of photoelectric effect, the solar radiation can be directly converted into electrical energy, light → electrical conversion of the basic device is the Solar Panels Design. The Solar Panels Design is a device that converts solar energy directly into electrical energy due to the photovoltaic effect. It is a semiconductor photodiode. When the sun shines on the photodiode, the photodiode turns the solar energy into electricity. Current. When many batteries in series or in parallel can become a relatively large output power of the Solar Panels Design array.
Solar Panels Designs are a promising new power source with three advantages: permanence, cleanliness and flexibility. Solar Panels Designs can be used as a long-term use; and solar power, compared to solar power, Solar Panels Designs can not cause environmental pollution; Solar Panels Designs can be large and small simultaneously, large to millions of kilowatts of medium-sized Power station, small to only one for the use of Solar Panels Designs, which is unmatched by other power supply.
Second, the solar panel power calculation method:
Solar AC power generation system is composed of solar panels, charging controller, inverter and battery together; solar DC power generation system does not include the inverter. In order to make the solar power system can provide enough power for the load, it is necessary according to the electrical power, a reasonable choice of components. Below the output power of 100W, 6 hours a day for example, to introduce the calculation method:
1, the first calculation of the number of watts per day (including the loss of the inverter): If the inverter conversion efficiency of 90%, then the output power of 100W, the actual output power should be 100W / 90 % = 111W; if used for 5 hours per day, the output power is 111W * 5 hours = 555Wh.
2, the calculation of solar panels according to the daily effective sunshine time of 6 hours, taking into account the charging efficiency and the loss of charging process, solar panel output power should be 555Wh / 6h / 70% = 130W. Of which 70% are charged during the actual use of solar panels.
Third, power generation efficiency:
Monocrystalline silicon solar photovoltaic conversion efficiency of the highest 24%, which is all types of Solar Panels Designs in the photoelectric conversion efficiency of the highest. However, the production cost of monocrystalline silicon Solar Panels Designs is so large that it can not be used extensively and widely. Polycrystalline silicon Solar Panels Designs from the production cost, monocrystalline silicon Solar Panels Designs than the cheaper, but the polysilicon Solar Panels Design photoelectric conversion efficiency will have to reduce a lot. In addition, the polysilicon Solar Panels Design life than monocrystalline silicon Solar Panels Designs shorter. Therefore, from the performance and price ratio, monocrystalline silicon Solar Panels Designs is also slightly better.
Researchers have found that some compound semiconductor materials are suitable for use as solar photovoltaic films. Such as CdS, CdTe, III-V compound semiconductors: GaAs, AIPInP, etc .; thin film Solar Panels Designs fabricated with these semiconductors exhibit good photoelectric conversion efficiency. With a gradient energy gap with a variety of semiconductor materials, solar energy absorption spectrum can be expanded, thereby improving the photoelectric conversion efficiency. So that a large number of thin film Solar Panels Design applications show broad prospects. Among these diverse semiconductor materials, Cu (In, Ga) Se2 is an excellent solar absorbing material. Based on it can be designed to photoelectric conversion efficiency than silicon significantly higher thin film Solar Panels Designs, can achieve the photoelectric conversion rate of 18%.