Even though silicon is a component of polycrystalline solar panels as well, single-crystal silicon is not used. The wafers for polycrystalline solar panels are created by melting a number of silicon shards together. They are referred to as "poly" or multi crystalline for this reason. Polycrystalline solar panels have a little lower efficiency, however this has the advantage of being a more inexpensive choice for clients. Furthermore, when you search for polycrystalline solar panels for sale, the vendors may emphasise the blue colour of these panels as opposed to the black colour of the monocrystalline panels.