It is necessary to determine how many square meters of solar panels to buy according to the electricity demand of one's own family. At present, solar cells on the market are divided into amorphous silicon and crystalline silicon. Among them, crystalline silicon can be divided into polycrystalline silicon and single crystal silicon. From the perspective of the photoelectric conversion efficiency of the three materials: monocrystalline silicon (up to 17%) > polycrystalline silicon (12~15%) > amorphous silicon (about 5%). Crystalline silicon (single crystal silicon and polycrystalline silicon) basically does not generate current under low light, and amorphous silicon has good low light performance (in low light, there is little energy). So on the whole, monocrystalline silicon or polycrystalline silicon solar cell materials should be used, and considering the high price of monocrystalline silicon materials, polycrystalline silicon materials are generally used. If you choose a polycrystalline silicon solar panel with a power of about 250W, then a 5KW system requires 20 panels.

The solar photovoltaic bracket is a special bracket designed for placing, installing and fixing solar panels in the solar photovoltaic power generation system. The general materials are aluminum alloy and stainless steel, which have a longer service life after hot-dip galvanizing.