Polycrystalline solar panels

 

— the cell of such panels consists of a large number of heterogeneous silicon crystals and includes a small amount of secondary raw materials (impurities from recycled solar panels or silicon waste from the metallurgical industry). The color of polycrystalline solar panels is dark blue. Such a structure slightly reduces the efficiency (up to about 16-18%), however, these panels are cheaper than monocrystalline ones and work effectively even in weak sunlight.