1. Classification of solar cells:
Solar cells currently on the market are divided into amorphous silicon and crystalline silicon. Crystalline silicon can be divided into polycrystalline silicon and monocrystalline silicon. Judging from the photoelectric conversion efficiency of the three materials: monocrystalline silicon (up to 17%) > polycrystalline silicon (12 to 15%) > amorphous silicon (about 5%). However, crystalline silicon (monocrystalline silicon and polycrystalline silicon) basically does not generate current under low light, and amorphous silicon is good under low light (it has very little energy under low light). Therefore, from an overall point of view, it is suitable to use monocrystalline silicon or polycrystalline silicon solar cell materials.
Second, the selection method of solar cells
1 When we purchase solar cells, the emphasis is on the ppower of solar cells. Generally speaking, the power of solar panels is the same. like the power of solar cells. Directly proportional to the surface area of the solar panel. The surface area of the solar cell wafer is not completely equal to the surface area of the solar package panel, because although some solar panels are large, the gaps between single solar wafers are very wide and the power of these panels solar is not necessarily high.
Knowledge about purchasing solar batteries
2. Generally speaking, the larger the power of the solar panel, the better, so that the current generated in the sun is large and it can be built. -in quickly. The battery is fully charged. But in reality, you have to find a balance between the power of the solar panel and the portability of the solar charger. It is generally believed that the minimum power of a solar chargercannot be less than 0.75W, and an under-power solar panel can produce 140mA current under standard strong light. The current generated under sunlight is about 100mA. If the charging current is too low below underpower, there will be almost no obvious effect.