Poly solar panels generally have good efficiencies.Their advantage is a lower price point. In addition, poly solar panels tend to have a blue hue instead of the black hue of mono panels. Poly solar panels are also made from silicon. However, instead of using a single crystal of silicon, manufacturers melt many fragments of silicon together to form the wafers for the panel. poly solar panels are also referred to as “multi-crystalline,” or many-crystal silicon. Because there are many crystals in each cell, there is to less freedom for the electrons to move. As a result, poly solar panels have lower efficiency ratings than mono panels.