With the rise of mobile technology, mobile power is essential; and the most appropriate way, than its direct weaving into our clothes. Scientists have recently invented the solar power wire, moving towards the goal of flexible electronics.
Each piece of new solar cells, such as the size of the palm of your hand, is soft and does not exceed half a millimeter thick and produces about 75 milliwatts of electricity. Made into a large area can be bent into a roll, for curtains and wallpaper. It is only a layer of titanium oxide, with screen printing technology fixed to the flexible substrate, the material and production costs are quite cheap.
"There are several elements that make it very attractive," said Shawshank Priia, who runs the project. "First, it is not necessary to manufacture in a high temperature environment, making the equipment relatively inexpensive and easy to operate." Second, Potentially extensible, made of wallpaper for residential power supply, running alarm system, charging the phone, lighting the LED lights.
The most useful feature of solar panels is its ability to absorb scattered light. It can not only use the sun, but also the use of LED, incandescent and fluorescent light emitted. You may see such a strange situation: the system lights up the lights, and part of the lights and let the system re-recovery, and then power, for the same light power.
At present, the flexible solar panels operating efficiency of about 10%, slightly behind the ordinary silicon panel efficiency peak (13% -15%), the team that efficiency can be increased to more than its rigid brother level, and ultimately woven into clothes, Manufacturing military backpack and so on. If re-integrated into some other technology (such as piezoelectric power generation), allowing the soldiers to charge in the field.
The solar light is on the semiconductor p-n junction to form a new hole-electron pair. Under the action of the p-n junction electric field, the holes flow from the p region to the n region. The electrons flow from the n region to the p region, and the current is formed after turning on the circuit. This is the photoelectric effect of the working principle of solar cells.
Solar power generation There are two ways of solar power generation, one is light - heat - electricity conversion, the other is the optical - electrical direct conversion.
(1) light - heat - electric conversion method through the use of solar radiation generated by thermal power, 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 conversion process; the latter process is the thermo-electrical conversion process.
(2) optical - electrical direct conversion method is the use of photoelectric effect, the solar radiation can be directly converted into electrical energy, optical - electrical conversion of the basic device is the solar cell. Solar cells are 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 cell array.
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 per day for example, to introduce the calculation method:
1. First calculate the number of watts per day (including the loss of the inverter): If the conversion efficiency of the inverter is 90%, then when the output power is 100W, the actual output power should be 100W / 90 % = 111W; if used for 5 hours per day, the power consumption is 111W * 5 hours = 555Wh.
2. 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, the solar panel output power should be 555Wh / 6h / 70% = 130W. Of which 70% is charged during the actual use of solar panels power.