The cells on monocrystalline (mono) and polycrystalline (poly) panels are formed by creating a large silicon ingot, which is then sliced up into cells and laid out across a panel. The difference between the two is in the method used to create the initial silicon ingot. Mono cells use a process that consumes more energy and only grows in a circular form, but the result is silicon of higher purity (hence higher efficiency) and a more uniform, darker finish, something many homeowners find appealing.
Polycrystalline cells require less energy and can be moulded into a square shape, which reduces wasted silicon when they’re sliced into wafers. They aren’t quite as efficient as monocrystalline cells and generally have a dark blue, non-uniform appearance. When it comes to choosing the right panels for you, neither monocrystalline or polycrystalline cells are a clear indicator of quality. That being said, most mono panels are more efficient than their equivalent poly counterparts. While this is not the only factor to keep in mind when determining the quality and efficiency of panel, it is well worth keeping in mind when making your panel purchase decision.
