For those who like outdoor travel and wilderness adventures, portable solar power should be an essential part of the equipment because it can be used for your camping LED lights, mobile phones, digital cameras, PSPs, GPS, mp4 players, laptops, etc. Digimon provides reliable green power protection, but currently portable solar power products are still in the initial stage of development in China, and the quality of products on the market is also uneven. Here is a brief introduction to how to choose a portable solar power supply, which provides a useful reference for you to purchase such products.
The portable solar power equipment is divided into three parts from the composition: one, solar panels; two, dedicated storage batteries; three, standard accessories.
In general, the quality and performance of portable solar power products are mainly: solar panels and dedicated storage batteries:
Solar panels Currently, there are three types of solar panels on the market: single crystal silicon, 2, polysilicon, 3, amorphous silicon. The following three solar panels are introduced from the perspective of consumers:
Monocrystalline silicon solar panel
1. Monocrystalline silicon solar cell: The current production process has been finalized. It is a kind of semiconductor battery that is used in the production of solar power. It is characterized by good stability and high photoelectric conversion rate. According to the current development level of solar energy technology, monocrystalline silicon solar energy The photoelectric conversion rate of the battery can reach 15%-18%. The photoelectric conversion rate of the monocrystalline silicon solar cell used in China's Shenzhou No.7 and Changyi No.1 is 40% (haha~~ Of course this is still only In the high-tech fields such as national defense and aerospace, the technical problems are too expensive, and it is estimated that it can be promoted in the private sector in seven or eight years);
Polycrystalline solar panel
2, polycrystalline silicon solar cells: the advantages of comparing single crystal solar cells are low cost, better sensitivity than single crystal silicon, both sunlight and incandescent lamps can be sensitive, but the shortcoming is also obvious, photoelectric conversion rate is only: 11% -13 %, with the development of technology, the efficiency is also improving, but the efficiency of single crystal silicon is still slightly inferior;
Amorphous silicon solar panel
3. Amorphous silicon solar cells: The problem with amorphous silicon solar cells is that the photoelectric conversion efficiency is low, and the international advanced level is about 10%. At present, the domestic is only: 6%--8% and not stable enough, often with conversion efficiency. The phenomenon of decline, so it has not been widely used for large-scale solar power, and most of it is used for low-light power, such as pocket-sized electronic calculators, electronic clocks and so on. After the estimation of the efficiency decline problem, the amorphous silicon solar cell will promote the development of solar energy utilization. At least the current cost as a portable solar power battery is relatively low. ~ One point, cheap, but not practical! !
Having said that, my friends must still blame: In the end, how to distinguish between three types of silicon solar panels, I specially took three photos for my friends, the difference is still very big! !
Therefore, on the whole, the battery of portable solar power is still dominated by monocrystalline silicon and polycrystalline silicon, but there are also some merchants who use the amorphous silicon solar panel for one-sided pursuit of low price without considering the use of functions. Friends should keep their eyes open when you buy, and you can understand, oh~~ Don’t spend money to buy a useless DD.
Dedicated storage battery
Portable solar power portable solar power supplies on the market now come with dedicated storage batteries for charging on cloudy days and nights.
In terms of materials, there are lithium batteries and nickel-metal hydride batteries.
Lithium battery: two kinds of liquid Lithium-ion Battery and polymer lithium battery
The characteristic of the lithium battery is that there is no memory effect in charge and discharge, and it can be charged at any time.
The liquid lithium ion battery is the lithium battery used in the traditional mobile phone/digital camera; the polymer lithium ion battery has the advantages of thinning, arbitrary area and arbitrary shape, and does not cause leakage, combustion and explosion. The problem is that the battery casing can be made of aluminum-plastic composite film, so that the specific capacity of the whole battery can be improved; the polymer lithium ion battery can also use the polymer as the positive electrode material, and the mass ratio energy will be higher than the current liquid lithium ion. The battery is increased by more than 50%. In addition, polymer lithium-ion batteries are more efficient than lithium-ion batteries in terms of operating voltage, charge and discharge cycle life, and the like. As cost decreases, polymer lithium-ion batteries will replace traditional liquid lithium-ion batteries.
Nickel-metal hydride batteries: The biggest problem is the memory effect of charge and discharge, the defect of charging and discharging efficiency, and generally the voltage of each battery unit is smaller than that of lithium-ion batteries, so the general portable solar power source is no longer used. Nickel-metal hydride batteries are used as storage batteries.
In addition: the qualified portable solar power battery will have a charge overload, over-voltage and over-current protection function, the battery will automatically shut down after charging, no longer charge, discharge to a certain extent will automatically cut off the power to protect the battery and electricity equipment.
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