Both are good products. The specific difference is that monocrystalline panels have a higher power generation on sunny days, higher conversion efficiency, and slower attenuation than polycrystalline panels. Under cloudy weather conditions, the partial weak light of polycrystalline silicon panels is better than that of monocrystalline silicon. Therefore, polycrystalline silicon is mainly used in rainy weather in the south. Users in the north mainly use monocrystalline silicon because the climate in the north is better than in the south. When using solar panels, they must face 12 o'clock. The angle between the panel and the ground should be 30-45 degrees, and the viewpoint should face south. Do not place the solar panel on the ground, as this will result in low power generation.