Solar Panel Efficiency

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Last Updated on 18th September 2024

Most Efficient Solar Panels in the UK 2024

Solar panel technology has come a long way in recent years with efficiency rates steadily improving as manufacturers innovate and refine their designs.

In the UK, homeowners looking to maximise their solar energy production have a range of high-performance options to choose from with monocrystalline panels currently standing out as the most efficient type available on the market.

In this article, we'll examine some of the most efficient solar panels in the UK while also explaining what solar panel efficiency means and why it's an important factor to consider when investing in a solar energy system.

For ease, here is a quick breakdown of some of the most efficient solar panels in the UK:

PanelEfficiency
1. AIKO N-Type ABC Series White24.0%
2. REA Fusion 223.9%
3. AIKO N-Type ABC Series Black23.8%
4. Longi Solar Hi-Mo X6 Scientist23.3%
5. Canadian Solar TOPHiKu623.2%
6. SunPower Maxeon 6 AC23.0%
7. REC Alpha Pure-RX Series22.6%
8. DMEGC 450W All Black Monofacial Single Glass22.5%
9. Perlight 450W Double Glass Black22.5%
10. Trina Vertex S21.8%

This list is not exhaustive and some panels with comparable efficiencies may be excluded.


1. AIKO N-Type ABC Series White

💡 Efficiency: 24%

AIKO's N-Type ABC Series White solar panels represent some of the most efficient photovoltaic modules currently available on the market. These panels use innovative All Back Contact (ABC) technology which helps them achieve an impressive efficiency of up to 24%. This means they can convert nearly a quarter of the sunlight they receive into usable electricity, outperforming many other panels available today.

The panels have a sleek, all-white design without visible lines on the front making them an attractive addition to any roof. They're built to last with a 15-year product warranty and a 30-year performance warranty. One of their key advantages is better performance in high temperatures and partially shaded conditions which is great for real-world use. The panels also degrade very slowly over time and maintain high performance for many years.

For homeowners looking to maximise their solar energy production with a reliable, efficient and visually appealing option, AIKO's N-Type ABC Series White panels offer a compelling choice.


2. REA Fusion 2

💡 Efficiency: 23.9%

REA Fusion 2 solar panels boast an impressive efficiency of 23.9% and are particularly well-suited for the UK's often cloudy weather as they're optimised to perform well in low-light conditions.

They feature a unique bifacial design allowing them to absorb sunlight from both the front and back of the panel, potentially increasing energy production. The panels come with a robust 25-year product and performance warranty. While they're on the pricier side, they offer advanced features like integrated microinverters for improved performance and panel-level monitoring.


3. AIKO N-Type ABC Series Black

💡 Efficiency: 23.8%

AIKO's N-Type ABC Series Black solar panels are cutting-edge devices that offer impressive performance and sleek aesthetics similar to their white counterparts. Both versions use innovative ABC technology which places all electrical contacts on the back of the panel.

Both colour options boast high efficiency ratings with the black series reaching up to 23.8%. This minor difference in efficiency is due to the black panels absorbing more heat which can slightly reduce performance. Both versions use N-Type cells known for superior performance in low-light conditions and offer the same strong warranty package.

Ultimately, the choice between the two often comes down to personal aesthetic preference and specific installation requirements.


4. Longi Solar Hi-Mo X6 Scientist

💡 Efficiency: 23.3%

The Longi Solar Hi-MO X6 Scientist is a cutting-edge solar panel that stands out for its high efficiency and advanced technology. This panel boasts an impressive efficiency rating of up to 23.3% and uses Longi's innovative Hybrid Passivated Back Contact (HPBC) cell technology which places all electrical contacts on the back of the cell which allows for more sunlight absorption on the front surface.

The panel offers a power output range of 440-450 watts for residential models making it suitable for homeowners looking to maximise energy production with limited roof space. Longi backs these panels with a 15-year product warranty and a 25-year performance warranty.

While the Hi-MO X6 Scientist panels may come at a premium price due to their advanced features, they offer excellent durability and performance which could potentially lead to greater energy savings over time.


5. Canadian Solar TOPHiKu6

💡 Efficiency: 23.2%

Canadian Solar's TOPHiKu6 series is a high-performance line of solar panels designed for both residential and commercial use. These panels stand out for their impressive efficiency and use advanced N-type TOPCon (Tunnel Oxide Passivated Contact) cell technology which helps improve performance and reduce energy loss.

These panels are built to last with a 25-year product warranty and a 30-year performance warranty. The TOPHiKu6 panels are also designed to perform well in various conditions including low-light and high-temperature environments. With power outputs ranging from 420W to 470W for residential models, these panels offer a great balance of efficiency and power.


6. SunPower Maxeon 6 AC

💡 Efficiency: 23%

The SunPower Maxeon 6 AC is a cutting-edge solar panel designed for residential use. It combines high efficiency with advanced technology, converting up to 23% of sunlight into usable electricity. What sets this panel apart is its built-in Enphase microinverter which allows each panel to operate independently. This means if one panel is shaded or has an issue, the others continue working at full capacity which maximises overall system performance.

The Maxeon 6 AC is also known for its durability with a design that resists cracking, corrosion and degradation over time. SunPower backs this panel with an impressive 40-year warranty, one of the longest in the industry. This warranty covers both the panel and its performance which gives homeowners peace of mind. The panel is also designed to perform well in various conditions including low light and high temperatures making it suitable for a wide range of climates.


7. REC Alpha Pure-RX Series

💡 Efficiency: 22.6%

The REC Alpha Pure-RX Series is a cutting-edge line of solar panels designed for both residential and commercial use. These panels stand out for their high efficiency with a conversion rate of up to 22.6%.

The Alpha Pure-RX Series uses advanced heterojunction cell technology which helps the panels perform better in hot conditions – a common issue for solar panels. They're built to last with a strong frame that can withstand heavy snow and high winds. REC has also made these panels more environmentally friendly by removing lead from all components making them fully compliant with RoHS regulations.

The panels come with a robust warranty offering 25 years of coverage for both the product and its performance when installed by an REC certified professional. With their sleek, all-black design and high power output, the Alpha Pure-RX Series offers a compelling combination of aesthetics, performance and durability for homeowners looking to maximise their solar energy production.


8. DMEGC 450W All Black Monofacial Single Glass

💡 Efficiency: 22.5%

The DMEGC 450W All Black Monofacial Single Glass solar panel is a high-performance module that stands out for its sleek all-black design which makes it visually appealing on rooftops. With an impressive efficiency of 22.5%, the panel uses N-type monocrystalline cells which are known for their superior performance and durability.

It's built to withstand harsh weather conditions including heavy snow loads and high winds. DMEGC also offers a strong warranty package with a 25-year product warranty and a 30-year performance warranty. The panel weighs about 20.9 kg and uses tempered solar glass with an anti-reflective coating to maximise light absorption. While it may be priced higher than some competitors, many users find the combination of high efficiency, durability and attractive design worth the investment for their solar energy needs.


9. Perlight 450W Double Glass Black

💡 Efficiency: 22.5%

The Perlight 450W Double Glass Black solar panel uses advanced monocrystalline PERC (Passivated Emitter Rear Cell) half-cell technology which contributes to its high efficiency and power output. The double glass construction adds durability and protection against harsh weather conditions which potentially extends the panel's lifespan.

With a power output of 450 watts, it's on the higher end of residential solar panels which allows homeowners to generate more electricity with fewer panels. Perlight offers a strong warranty package, typically including a 12-year product warranty and a 30-year performance warranty.

The Perlight 450W Double Glass Black panel is designed to perform well in various conditions, including low-light environments, making it a versatile choice for many solar installations.


10. Trina Vertex S

💡 Efficiency: 21.8%

The Trina Vertex S offers an impressive balance of power, efficiency and aesthetics. With power outputs ranging from 405W to 430W and efficiencies up to 21.8%, these panels can generate significant electricity from limited roof space.

The Vertex S uses advanced monocrystalline PERC cells with multi-busbar (MBB) technology which improves light capture and reduces electrical resistance. A unique feature is its use of larger 210mm cells cut into thirds which allows for a compact panel size while maintaining high power output.

The all-black design of some models provides an attractive appearance on rooftops. Trina Solar backs these panels with a 15-year product warranty and a 25-year performance warranty which ensures long-term reliability. The Vertex S is also designed to be compatible with most inverters and mounting systems which makes it a versatile choice for various solar installations.


What is Solar Panel Efficiency?

Solar panel efficiency refers to the rate at which a panel converts sunlight into usable electricity. This is typically expressed as a percentage with higher percentages indicating greater efficiency. For example, if a solar panel has an efficiency rating of 18%, it means that 18% of the sunlight hitting the panel could be converted into electrical energy.

For typical home systems in the UK, solar panel efficiency generally falls between 15% and 23%. However, it's important to note that efficiency is just one factor to consider when evaluating solar panels. We'll discuss this more later.


Why is it Important?

Solar panel efficiency is important because it directly influences the amount of electricity generated from sunlight which impacts both energy savings and the overall return on investment for homeowners. Higher efficiency panels convert a greater percentage of sunlight into usable electricity which allows for more energy production from the same amount of space.

However, it's important to note that generally, more efficient solar panels are also more expensive. Despite the higher initial cost, the increased energy output could lead to lower utility bills and a reduced carbon footprint.


Factors affecting Solar Panel Efficiency

Solar panel efficiency is influenced by various factors ranging from environmental conditions to technological aspects. Understanding these factors can help optimise your solar energy system:

Sun intensity

The intensity of sunlight directly impacts solar panel efficiency. Higher sun intensity generally leads to increased energy production. However, the relationship isn't always linear:

  • Solar irradiance varies throughout the day and year affecting panel output.

  • Geographic location plays a crucial role with regions closer to the equator typically receiving more intense sunlight.

  • Seasonal changes can significantly impact sun intensity and, consequently, solar panel performance.

Weather

Weather conditions have a substantial effect on solar panel efficiency:

Impact of heat:

Contrary to popular belief, high temperatures can actually reduce solar panel efficiency:

  • As temperature increases, the voltage output of a solar panel decreases which could lead to lower power production.

  • Proper ventilation and panel placement can help mitigate heat-related efficiency losses.

Impact of clouds:

Cloud cover can significantly affect solar panel performance:

  • Cloudy conditions reduce the amount of sunlight reaching the panels which could decrease energy production.

  • However, solar panels can still generate electricity on cloudy days just at reduced efficiency.

Panel design

The design and technology of solar panels play a crucial role in their efficiency:

  • Different types of solar cells (monocrystalline, polycrystalline and thin-film) offer varying levels of efficiency.

  • Anti-reflective coatings and light-trapping textures can improve a panel's ability to absorb sunlight.

  • Advances in cell technology, such as multi-junction cells, continue to push the boundaries of solar panel efficiency.

Shading

Shading is a critical factor that can significantly reduce solar panel efficiency:

  • Even partial shading of a single cell can disproportionately affect the entire panel's output.

  • Objects such as trees, buildings or even neighbouring solar panels can cast shadows that reduce sunlight exposure.

  • To minimise shading issues, careful site assessment and panel positioning is essential.

Solar Panel Orientation

For optimal energy production in the UK, solar panels should ideally face south. This orientation allows panels to capture the maximum amount of sunlight throughout the day. However, if your roof does not permit a south-facing installation, east or west orientations are also viable options:

  • East-facing panels generate more electricity in the morning making them suitable for households that use energy during those hours.

  • West-facing panels tend to produce more energy in the afternoon and evening which can benefit households with higher energy consumption later in the day.

Solar Panel Angle

The angle at which solar panels are installed is crucial for maximising their efficiency in the UK. The optimal tilt for solar panels generally falls between 30° and 40° from horizontal depending on your specific location:

  • This angle allows solar panels to effectively capture sunlight throughout the year.

  • For homes with flat roofs, adjustable mounts can be employed to achieve the ideal angle for maximum energy production.

If you need more information, you can read our guide on the best angle and direction for solar panels.


Other Important Aspects to Consider

Beyond efficiency, here are some other important aspects to consider when looking into solar panel installation:

Energy usage & system size

Understanding your household's energy consumption is essential for determining the appropriate size of your solar panel system. By assessing your energy needs, you can work with solar installers to calculate the optimal system size that will effectively meet your consumption patterns while maximising efficiency.

Aesthetics

The visual impact of solar panels is an important consideration for many homeowners. Modern solar panels come in various designs with options that feature a sleeker and more streamlined appearance.

Some manufacturers offer all-black panels which provide a more uniform look that can blend seamlessly with your roof. While some options may come at a higher cost, they can enhance the overall appearance of your home while still providing the benefits of solar energy.

Battery storage

Incorporating battery storage into your solar panel system can significantly enhance its effectiveness and energy independence. Batteries allow you to store excess energy generated during sunny days for use during non-sunlight hours or during peak demand times when electricity rates may be higher. Though, it is important to note that battery storage usually comes at an additional cost to the solar system.

Roof condition & space

The condition and characteristics of your roof play a vital role in the feasibility of installing solar panels. Before proceeding with installation, ensure that your roof is in good condition and capable of supporting the weight of the panels. Also, consider any obstructions such as chimneys or skylights that may limit panel placement and reduce overall efficiency.

You can read our article on 'is my roof suitable for solar panels' for more information.

Cost considerations

Financial considerations are often a primary concern when evaluating solar panel installation. When assessing costs, it’s crucial to factor in potential savings on electricity bills as well as any income generated from surplus energy fed back into the grid.

Understanding the estimated payback period is also essential as it helps you assess whether the long-term savings and benefits justify the initial investment. This allows you to make an informed decision about whether solar panels are a worthwhile addition to your home.


Most Efficient Solar Panels FAQs

What types of solar panels are the most efficient?

Monocrystalline solar panels are generally considered the most efficient type available followed by polycrystalline panels and thin-film.


How does weather affect solar panel efficiency?

Weather conditions can significantly impact solar panel efficiency. While panels can still generate electricity on cloudy days, their output will be lower compared to sunny days. Also, extreme temperatures can also affect performance with higher temperatures likely reducing efficiency.


How long do solar panels last?

Most solar panels are designed to last between 25 and 30 years. While their efficiency may gradually decrease over time, high-quality panels typically maintain at least 80% of their original output after 25 years.


Are more efficient solar panels worth the higher cost?

While more efficient solar panels tend to come with a higher upfront cost, they can lead to greater long-term savings by generating more electricity and reducing reliance on grid power. Homeowners should weigh the initial investment against potential savings on energy bills and consider their specific energy needs.


How do I choose the right solar panel system for my home?

To choose the right solar panel system, assess your household's energy consumption, consider your roof's orientation and compare different panel types based on efficiency and cost. You can also request quotes from qualified and respected solar panel installers to find out more.