There are three types of bulk-buy solar panels on the market： 1. Mono silicon solar cells, Anern's half-cell mono solar panel series can reach a conversion efficiency of up to 22% 2. Poly silicon solar cells. The conversion efficiency is lower than that of mono-silicon cells,  which average conversion efficiency of the market is about 12%. 3. Amorphous silicon solar cells, whose main advantage is that they can generate electricity even in low sunlight conditions, But the conversion efficiency is lowest and unstable.