Monocrystalline vs Polycrystalline Solar Panels: What’s the Difference?

Written-by

Janet Richardson

Reviewed-by

Richard Burdett

Updated on

Oct 07, 2026

Monocrystalline vs Polycrystalline Solar Panels: What’s the Difference?

Monocrystalline and polycrystalline solar panels are two types of photovoltaic panels used to convert sunlight into electricity, and each has distinct advantages and disadvantages.

Crystalline silicon solar panels are currently the most popular option for home use on the market. These include monocrystalline and polycrystalline models. As a result, many people think that they are the same, and forget that they actually have quite a number of differences. This page takes you through these, as well as how the panels work and the cost of investment. However, the UK domestic market has changed considerably in recent years. Most new residential panels are now monocrystalline, while polycrystalline panels have become increasingly uncommon in new installations.

Monocrystalline Solar Cells

Monocrystalline solar cells are also known as single crystalline cells. They are incredibly easy to identify because they are typically a dark black in colour. Monocrystalline cells are made from single-crystal silicon, which allows electrons to move efficiently through the cell and helps modern monocrystalline panels achieve high conversion efficiencies. Additionally, monocrystalline cells are also highly space-efficient and are now the dominant choice for UK domestic solar installations.

Although they are all described as monocrystalline, modern panels are not necessarily based on the same underlying cell technology. Technologies such as P-type PERC, N-type TOPCon, HJT and back-contact cells can all be used in monocrystalline panels and can affect efficiency, degradation, temperature performance and price. We explain these differences in more detail in our guide to monocrystalline solar panels.

They also have the advantage of being designed for a long operational life. In fact, many manufacturers will offer warranties of 25 years or more on this type of system. Historically, monocrystalline panels were considerably more expensive than polycrystalline alternatives. However, manufacturing improvements and the widespread adoption of monocrystalline technology have greatly reduced this difference, and polycrystalline panels are now rarely offered for new UK domestic installations.

Here are some of the advantages of monocrystalline solar cells:

• They have high levels of efficiency at around 18–23% for most residential panels
• They require less space compared to other types due to their high efficiency
• Manufacturers typically offer long warranties, often 25 years or more
• They can perform well in lower-light conditions, although performance varies between individual panel technologies and models
• Often have a more aesthetic appearance

Here are some of the disadvantages to monocrystalline solar cells:

• They have historically been more expensive to manufacture than polycrystalline cells, although this price difference has narrowed considerably
• Like all silicon solar cells, their output falls as cell temperature increases. The extent of this loss depends on the particular panel and its temperature coefficient
• Some monocrystalline manufacturing processes can produce silicon waste, although modern manufacturing techniques have reduced material losses considerably

Polycrystalline Solar Cells

Polycrystalline solar cells are also known as polysilicon and multi-silicon cells. They became commercially established during the early development of the solar industry. Most interestingly, polycrystalline cells do not undergo the same single-crystal manufacturing process as the monocrystalline cells. Instead, the silicon is melted and then poured into a square mould. This is what creates the specific shape of the polycrystalline cells.

One of the benefits of this process is that the solar cells were traditionally much more affordable. This is because the manufacturing process was simpler and produced less silicon waste than traditional monocrystalline manufacturing. However, they are less efficient than modern monocrystalline solar cells, and also require more space to produce the same amount of power. This is due to the multiple silicon crystal structures within the cell, which can restrict the movement of electrons compared with single-crystal silicon. Polycrystalline panels also generally have lower efficiencies than the modern monocrystalline panels now used for most domestic installations.

Although polycrystalline panels are still found on many existing UK solar installations, they are now increasingly uncommon as a choice for new domestic systems. The solar industry has largely moved towards higher-efficiency monocrystalline technologies.

Here are some of the advantages of polycrystalline solar cells:

• The manufacturing process has traditionally been cheaper and easier than for monocrystalline cells
• It can produce less silicon waste
• Suitable for larger roofs where space is not an issue

Here are some of the disadvantages to polycrystalline solar cells:

• Efficiency is typically lower than modern monocrystalline panels, so they are not the most efficient on the market
• They have lower output rates which make them less space efficient. So more roof space is needed for installation
• Blue colour may not be so appealing
• They are now rarely offered for new UK domestic solar installations

Want to Know More?

Have you found yourself interested in solar panels? If you want to know more then make sure you head to our solar panel guides, where you can find detailed information about solar panel technology, costs and installation. You can also use our installer directory to find solar panel installers in your area.