Solar chargers are sought after by the market because of their novel concept and ease of use. At present, solar chargers have neither national nor industry standards, leading to huge price gaps on the market and uneven quality. The author once discovered that there are as many as 40 solar chargers on sale in the market, and they are also known as "candlelights, lights, and light can be charged." So what kind of solar charger is a good solar charger? What kind of standard solar charger must achieve? The author wants to rely on his own experience in solar photovoltaic power generation products (including solar chargers) for more than ten years to publish his own views. Before discussing this topic, it is necessary to review what we learned in junior high school as “the law of conservation of energyâ€: energy will neither be destroyed nor created, it will only be transformed from one form to another, or from one The object is transferred to another object, and the total amount of energy remains unchanged during the process of conversion and transfer. With this knowledge reserve, we now have a basic sense of judgment, so we can use unscrupulous merchants to obtain the so-called "candle light, light can be charged as long as there is light," as a tone of humor or jokes. Another important criterion for measuring the quality of a control circuit is whether the control circuit has been protected in various ways. Generally speaking, a good solar charger, the control circuit should have: over-current protection (automatically limit the current when the current is too high, will not cause damage to the charging device), overshoot protection (when the battery power reaches the setting When the limit is reached, the battery will be automatically charged to prevent battery damage or even possible explosion. Over-discharge protection (mainly used to protect the battery from deep discharge and damage to the battery), temperature protection (when the control circuit temperature Exceeding the set temperature, the charger will automatically stop working to protect the battery). If none of these protections are implemented on the control circuit or most of them are not done, then the quality risk of the solar charger will be passed on to digital devices such as mobile phones that need to be recharged, which may cause losses to consumers. As we, Victor, developed their own solar chargers, the first thing that comes to mind is how to ensure safety. We have done a lot of work in this area. Therefore, consumers should not just look at the price when buying a solar charger. Although the circuit protection design is not perfect, the charger may not necessarily damage your charged device, but it is still necessary to spend money to buy a peace of mind. Because solar chargers use different environments than ordinary electronic products, solar chargers have the highest requirements for built-in batteries. But this is precisely where consumers easily overlooked, but also some places lack of social responsibility manufacturers are easy to make hands and feet. In the market, the price of a battery of the same capacity may be several times the difference, so some of the cottage manufacturers are aiming for a huge profit, and many very cheap chargers have to use batteries after the renovation of the secondary batteries. The battery is B product and C product. This will not have a short battery life, it may also bring personal safety risks to consumers. Holster Gift Tape,Mini Round Retractable Tape Measure,Long Distance Round Retractable Tape Measure,Round Retractable Tape Measure Shangqiu Jinda Tools Co.,Ltd , https://www.jindameasur.com
The evaluation of whether a solar charger is practical or whether it is a good product mainly depends on three aspects:
solar panel
Solar cells currently available in the market are classified into amorphous silicon and crystalline silicon. Among them, crystalline silicon can be further divided into polysilicon and monocrystalline silicon. The photoelectric conversion efficiency from three materials is: Monocrystalline silicon (up to 17%)> Polysilicon (12 to 15%)> Amorphous silicon (about 5%). However, crystalline silicon (monocrystalline silicon and polysilicon) is not likely to generate current under low light, and amorphous silicon is of low light type (the energy is low in weak light). Therefore, synthetically, it is advisable to use monocrystalline or polycrystalline silicon as a material for solar cells.
Next, we must focus on the power of solar panels. In general, the power of solar panels is directly proportional to the area of ​​solar wafers (the area of ​​solar cells is not exactly the same as the area of ​​solar panels, because there is solar energy. Although the panel is large, but the solar wafers are arranged in a wide gap, so the solar panel power is not necessarily high.For example, we have VSC-03 although the solar panel is not large, but the wafers are arranged closely and achieve a 0.75W in a relatively small area. Power). In general, the greater the power of the solar panel, the better, so that the current generated in the sun is large, and it can quickly fill its built-in battery. But in reality, we need to find a balance between the power of solar panels and the portability of solar chargers. Generally speaking, we believe that the minimum power of solar charger can't be lower than 0.75w, (this power has the solar panel produced under the standard light intensity with 140mA current. In the general sunlight produces a current of about 100mA) if less than this If the power charging current is too small, there is basically no noticeable effect.
Control circuit
If the solar panel is the front end of the charger, responsible for collecting solar energy and converting the solar energy into electricity, then the control circuit is the backbone of the entire product. It mainly undertakes two functions: First, the current generated by the front end is stored to the built-in battery as much as possible to eliminate or minimize the waste; second, as much as possible when the charger recharges the mobile phone and other equipment, the built-in battery Ride's electricity is output to mobile phones and other devices, and as little as possible power loss on the line. Unfortunately, due to cognitive or technical problems, the current domestic manufacturers have not paid enough attention to the optimization of solar charger control circuit design, resulting in a poor practicality of the solar charger produced: the front-end generated current can not be fully stored To the battery; when the built-in battery is used to charge a device such as a mobile phone, a large part of the current is wasted on the line and cannot be input to the charging device.
Therefore, when consumers choose solar chargers, they need to pay more attention to these two indicators: the second conversion rate (front-end generated by the electricity stored in the battery to the efficiency) and discharge efficiency (built-in battery power input to the need for charging equipment effectiveness). The higher these two efficiencies, the better. In general, the secondary storage efficiency is now well achieved at 95%, and the discharge efficiency can reach over 83%.
battery
Solar charger should be built-in battery should be lithium polymer battery is better than usual we usually have lithium battery (liquid lithium ion), polymer battery lithium ion gel to install, the activity is much smaller than liquid lithium-ion battery, so not Explosion will occur. And for the use of solar charger environment, the polymer battery is best processed at high temperature, increase the battery temperature limit.
Finally, it should be noted that the shell surface treatment and its various accessories. The common solar charger on the market is mainly plastic shells, and the surface treatment mainly includes bright oil, rubber paint, and UV. Lubricating oil is cheaper, and the surface is prone to scratches. Rubber lacquer feels very comfortable, but paint will fall off as usage time increases. UV is generally used only on high-end mobile phones and is expensive. With UV treatment, the surface of the product is smooth and fine, while the hardness is good, and paint is not removed, leaving no scratches.
If the solar charger has a DC adapter, it is necessary to pay more attention to the quality of the DC adapter. After all, this is related to product and personal safety.