Solar panels are a central part of solar street lights and the most valuable part of solar street lights. Its role is to convert the solar radiation into electricity, or sent to the battery for storage. In many solar cells more common and more practical are monocrystalline silicon solar cells, polycrystalline silicon solar cells and amorphous silicon solar cells and other three. Solar sunshine is good enough in the western region, the use of polycrystalline silicon solar cells is better, because the production process of polycrystalline silicon solar cells is relatively simple, the price is lower than the single crystal. In cloudy and rainy days, the sun is relatively not very adequate in the South, the use of monocrystalline silicon solar cells is better, because the performance parameters of monocrystalline silicon solar cells is relatively stable. Amorphous silicon solar cells in the absence of sunlight is better, because amorphous silicon solar cells on the sunlight conditions require relatively low.