A solar cell is a device that responds to light and converts light energy into electricity. Solar panel structures There are many kinds of materials that can produce photovoltaic effect, Solar panel structures 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, Solar panel structures the formation of P-N junction.
When the light is irradiated on the surface of the solar cell, Solar panel structures 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. Solar panel structures When the external circuit is turned on , In the role of the voltage, Solar panel structures 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; Solar panel structures the latter process is hot → electrical conversion process, as with ordinary thermal power generation. Solar panel structures The shortcomings of solar thermal power generation are inefficient and costly.
(2) light → electrical direct conversion: the way is the use of photoelectric effect, Solar panel structures the solar radiation can be directly converted into electrical energy, light → electrical conversion of the basic device is the solar cell. The solar cell 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, Solar panel structures 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 cell array.
Solar cells are a promising new power source with three advantages: permanence, cleanliness and flexibility. Solar cells can be used as a long-term use; and solar power, compared to solar power, Solar panel structures solar cells can not cause environmental pollution; solar cells 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 cells,Solar panel structures which is unmatched by other power supply.
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, Solar panel structures it is necessary according to the electrical power, Solar panel structures a reasonable choice of components.
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 structures solar panel output power should be 555Wh / 6h / 70% = 130W. Of which 70% are charged during the actual use of solar panels.