Do you know how to go about selecting solar panels?
Solar cells on the market today are divided into amorphous silicon and crystalline silicon. Among them, crystalline silicon can be further divided into polycrystalline silicon and monocrystalline silicon. The photoelectric conversion efficiency of the three materials is: monocrystalline silicon (up to 17%) > polycrystalline silicon (12-15%) > amorphous silicon (about 5%). But crystalline silicon (monocrystalline silicon and polycrystalline silicon) in the low light basically will not have current generation, amorphous silicon low light type good (in the low light energy would have been very little). So on balance, it is appropriate to use monocrystalline silicon or polycrystalline silicon solar cell materials.
When we buy solar cells, the focus of attention is the power of the solar cells. Generally speaking, the power of solar panels is proportional to the area of the solar wafers. The area of the solar cell wafer is not exactly equal to the area of the solar package panel, because some solar panels are large, but the gaps in the solar wafer arrangement are wide, so the solar panel power is not necessarily high.
Generally speaking, the greater the power of the solar panel, the better? This produces a large current in the sun and can quickly fill its built-in battery. However, in reality, the power of the solar panel and the portability of the solar charger are needed to find a balance point. It is usually considered that the minimum power of a solar charger should not be less than 0.75w. Sub-powered solar panels have a current generation of 140mA in standard bright light. The current generated in general sunlight is around 100mA. If the charging current is too small below the sub-power, there will basically be no significant effect.
With the widespread use of various solar products, the use of solar cells in our lives has become more and more widespread. But in the face of the various types of solar cells on the market, how do we choose them?
1, the choice of solar battery battery capacity
As the input energy of solar photovoltaic power generation system is extremely unstable, so generally need to configure the battery system to work, solar lamps and lanterns are no exception, must be configured battery to work. There are generally lead-acid batteries, Ni-Cd batteries, Ni-H batteries, their capacity selection directly affects the reliability of the system and the system price. Battery capacity selection generally follows the following principles: first of all, under the premise of being able to meet the night lighting, to store the energy of the solar modules during the day as much as possible, but also to store the electricity needed to meet the continuous rainy days and nights lighting. Battery capacity is too small to meet the needs of night lighting, battery capacity is too large, on the one hand, the battery is always in a state of power loss, affecting battery life, while causing waste.
2, the choice of solar cell packaging form
At present, there are two main forms of solar cell packaging, lamination and drip rubber, lamination process can ensure that the working life of solar cells more than 25 years, drip rubber, although beautiful at the time, but the working life of solar cells only 1 ~ 2 years. Therefore, for small power solar lawn lights below 1W, if there is no high life requirement, we can use the drip adhesive encapsulation form, for solar lights with a specified service life, we suggest using the laminated encapsulation form. In addition, there is a silicon gel for drip encapsulation solar cells, it is said that the working life can reach 10 years.
3, the choice of solar cell power
The solar cell output power Wp we are talking about is the output power of solar cells under standard solar lighting conditions, i.e.: 101 standard as defined by the European Commission, radiation intensity 1000W/m2, atmospheric mass AM1.5, cell temperature 25℃. This condition is about the same as the usual sunlight conditions around noon on a sunny day, which is not the rated output power as long as there is sunlight, as some people think, or even think that solar cells can be used normally under daylight at night. This means that the output power of a solar cell is random, and the output power of the same solar cell is different at different times and in different locations. Solar light information, between the aesthetic and energy-saving two, most choose energy-saving. The ideal tilt angle for solar cells is about 40 degrees, oriented due south.
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