When you evaluate solar panels for your photovoltaic (PV) system, you will encounter two categories of panel options: monocrystalline (mono) and polycrystalline (poly).
Both monocrystalline and polycrystalline solar panels serve the same function in the overall solar PV system: they capture energy from the sun and turn it into electricity. They are also both made from silicon, which is used for solar panels because it is an abundant, very durable element. Many solar panel manufacturers produce both monocrystalline and polycrystalline panels.
Both mono and poly solar panels can be good choices for your home, but there are key differences between the two types of technology that you should understand before making your final solar purchase decision.
Monocrystalline solar panels
To make solar cells for monocrystalline solar panels, silicon is formed into bars and cut into wafers. These types of panels are called “monocrystalline” to indicate that the silicon used is single-crystal silicon. Because the cell is composed of a single crystal, the electrons that generate a flow of electricity have more room to move. As a result, monocrystalline panels are more efficient than their polycrystalline counterparts.
Polycrystalline solar panels
Polycrystalline 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. Polycrystalline 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, polycrystalline solar panels have lower efficiency ratings than monocrystalline panels.
Mono vs. Poly solar panels: Which are right for you?
Saving money is one of the best reasons to solar, and whether you choose mono or poly solar panels, you’ll be decreasing your electricity bills. The option you choose comes down to your personal preferences, space constraints, and the financing option you choose.
Personal preferences: If the colour of your solar panels is important to you, remember that mono vs. poly solar panels tend to appear differently on your roof. The typical monocrystalline panel will tend to have a darker black colour, while the typical polycrystalline panel will tend to have a bluer colour. If where your panels were manufactured is important to you, then ensure you know enough about company that made your mono or poly solar panels.
Space constraints: You should prefer higher-efficiency solar panels if your PV system size is limited by the amount of space available on your roof. Because of this, paying the extra cost for more efficient monocrystalline panels that can help you maximize your electricity production will make more sense in these scenarios. Alternatively, if you have a lot of roof space or are installing ground-mounted solar, then lower-efficiency polycrystalline can be a more economic option.
Solar financing: How you finance your system can also play a part in determining which type of panel you choose. For example, if you choose a power purchase agreement (PPA), you pay per kilowatt-hour for the electricity produced by the system. This means that, above any type of equipment you’re being offered, your monthly payments will determine your savings. By contrast, if you are buying your system, paying more for high-efficiency monocrystalline panels can result in higher returns on your solar investment.
Compare Mono vs. Poly solar panel options before deciding on a system
We recommend you explore your options with both mono and poly solar panels before making a final purchase decision.