Bifacial Solar Panels vs. Monofacial: Which Is the Best Choice for the UK
Manan Shah
Last Updated 2 weeks ago
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Can your roof generate 25% more electricity without taking up a single extra square meter of space? And with energy prices still painfully high, is there a smarter solar technology that could slash your payback period by years?
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So let’s say you’ve just installed solar panels on your home in Manchester, and are excited to lower your bills and go green. The system looks great,10 solar panels on your south-facing roof, and they’re working fine. But then, one day, you visit your neighbour, who has the same setup: 10 panels, the same roof angle, installed around the same time, and yet, their energy generation is 18% higher than yours. How could this be possible? Well, the answer is simple: bifacial solar panels, something you didn’t even consider.
These double-sided panels capture reflected sunlight from the roof, which helps boost efficiency and makes a massive difference. It’s a simple and yet powerful technology that uses every last drop of sunlight, something you now wish you’d known about from the start.
The scenario above doesn’t have to be you, because you’re still looking into solar panel installation, which is why you’re reading this blog, to find the best solar panels for UK conditions, and we’ve got two types for you to look at, and of course, compare. Stick around because in this blog, we’ll be looking into the key differences between bifacial and monofacial panels, examining their performance, costs, benefits, and the best choice for your specific needs in the UK climate. We’ll also discuss DMEG bifacial solar panels, a top-tier option offered by Solar 4 Good, and explain why they may be the perfect fit for your next solar installation.
TL:DR (Summary)
- Bifacial vs. Monofacial Panels: Bifacial solar panels capture sunlight from both sides, boosting energy efficiency by up to 30%, especially in cloudy or overcast conditions, making them ideal for the UK’s unpredictable weather. Monofacial panels are simpler, more affordable but less efficient.
- Performance in the UK: Bifacial panels thrive in the UK due to their ability to capture reflected light from surfaces like light-coloured roofs or snow. They perform well even in low-light conditions, providing better energy generation in winter and on overcast days.
- Cost and ROI: While bifacial panels come with a higher initial cost, they offer faster payback and better long-term savings due to increased energy output. Monofacial panels are cheaper upfront but provide less energy and take longer to pay off.
- Best Option: Choose bifacial panels if you want higher efficiency and better long-term performance and are willing to invest more upfront. Go for monofacial panels if you’re on a budget or have straightforward solar needs with plenty of direct sunlight.
What Are Bifacial Solar Panels, and How Do They Actually Work?
Bifacial solar panels are exactly what they sound like: solar panels that generate electricity from both sides, so basically, double-sided solar panels. Unlike traditional monofacial panels with an opaque backing, bifacial modules feature transparent rear surfaces (typically dual-glass construction) that allow them to capture reflected and diffused light from below.
Here’s the clever part: while the front-facing cells do the heavy lifting by capturing direct sunlight, the rear-facing cells collect:
- Light reflected from the ground surface (roof tiles, white pebbles, concrete, even grass)
- Diffused atmospheric light that bounces around on overcast days
- Early morning and late evening light at low angles
- Light reflected from nearby surfaces, like white walls or conservatories
What’s The Technology behind double-sided solar panels?
Most modern bifacial panels use N-type monocrystalline cells with TOPCon (Tunnel Oxide Passivated Contact) technology. N-type cells are inherently more efficient at capturing low-light conditions compared to traditional P-type cells, making them the ideal match for the UK’s often grey skies.
The dual-glass construction provides additional benefits:
- Enhanced durability: Glass-on-glass design offers superior protection against harsh British weather
- Lower degradation rates: Typically 0.4% annually vs 0.7% industry average
- Extended lifespan: Often rated for 30+ years with warranties to match
- Better heat dissipation: Improved airflow on both sides keeps panels cooler and more efficient
The Science Behind Bifacial Panel Performance in UK Conditions
You might feel that bifacial panels would need blazing Mediterranean sunshine to justify high efficiency and fancy design, but that’s not the case; in fact, the UK’s climate actually provides several advantages which push solar panels that are double-sided to work at their absolute best:
Advantages
High Diffuse Radiation
Britain’s frequent cloud cover creates abundant diffuse radiation, sunlight scattered by clouds and atmospheric particles. Research from the UK’s largest bifacial solar plant demonstrates that bifacial modules show greater efficiency in capturing infrared radiation, particularly beneficial in diffuse lighting conditions.
Low Sun Angles
Our northern latitude means the sun sits lower in the sky, even at midday. This creates more opportunities for light to reach the rear surface of panels, especially during spring and autumn when generation is crucial.
Reflective Surfaces
Ground albedo studies conducted at Heriot-Watt University found that white surfaces like tiles and pebbles can boost rear irradiance gain by over 30%. Even standard concrete provides a 20%+ rear gain. With many UK homes featuring light-coloured roof tiles or ground surfaces, the reflective potential is enormous.
Ready to go Solar ?
What Are Monofacial Panels and How Do They Work?
If you’ve ever seen a rooftop covered in solar panels, chances are they were monofacial panels, the traditional, one-sided kind most people are familiar with. These panels have been powering homes and businesses for decades, using solar cells that only absorb sunlight from the front.
They’re simple, reliable, and have earned their place as the standard in solar technology. But because they only collect light from one side, their efficiency depends entirely on how much direct sunlight hits the surface. In bright, sunny areas, they perform beautifully, but in places where light is more scattered or reflected, they can’t make use of that extra energy bouncing around.
Their key features include:
- Single-Sided Capture: Only captures sunlight on the front-facing side.
- Lower Efficiency: Monofacial panels can capture less energy since they don’t take advantage of reflected light.
- Simplicity: Monofacial panels are easier to manufacture and install, making them more cost-effective than bifacial panels.
Monofacial panels remain the pragmatic choice and make more sense for:
- North-facing installations: Where bifacial gains are minimal anyway
- Heavily shaded properties: Where direct sunlight is already limited
- Flat roofs with low mounting height: Insufficient clearance for rear light capture
- Budget-conscious installations: Where every pound counts
- Older roof structures: They may struggle with the extra weight of dual-glass panels
Monofacial panels typically achieve efficiency ratings between 15 and 20%, delivering reliable performance in straightforward installations.
Bifacial vs. Monofacial: Key Differences
Here’s a table summarising the key differences between bifacial and monofacial solar panels:
Aspect
Energy Capture Efficiency
They can increase efficiency by up to 30% by capturing light from both sides.
Limited to capturing sunlight only from the front.
Performance in Cloudy Conditions
They perform better in overcast conditions due to reflected sunlight.
Perform poorly in cloudy or overcast conditions, as they rely solely on direct sunlight
Cost
Higher upfront cost due to a more complex design and manufacturing process
More affordable and budget-friendly, but often less efficient.
Installation Considerations
More versatile; requires reflective surfaces below, like light-coloured rooftops or concrete.
Easier to install and integrate into most roof types, good for retrofits.
Performance Comparison between Bifacial solar panels and Monofacial Solar panels
Criteria
Panel Efficiency
22-27%
15-22%
Bifacial
Low-Light Performance
Excellent
Good
Bifacial
Annual Degradation
0.4-0.5%
0.7%
Bifacial
Expected Lifespan
30+ years
25-28 years
Bifacial
Financial Comparison (4kWp System)
Criteria
Installation Cost
£5,500-£6,600
£4,000-£5,000
+£1,000-£1,500
Annual Savings
£550-£800
£400-£600
+£150-£200
Payback Period
8-11 years
8-10 years
Similar
25-Year Profit
£7,150-£13,400
£5,000-£10,000
+£2,000-£3,000+
Warranty
25-30 years
20-25 years
+5 years
Comparison in terms of installation and Practical Considerations
Criteria
Best Roof Orientation
South, SE, SW facing
Any orientation
Mounting Requirements
15-20cm rear clearance needed
Standard mounting
Ideal Ground surface
Light-coloured, reflective
Any surface
Panel Weight
26-28kg (dual-glass)
20-24kg (lighter)
Aesthetics
Modern, sleek, transparent backing
Traditional, opaque backing
Best Applications
Ground-mounted, elevated roofs, commercial
Budget installs, shaded sites, north-facing
Reminder:
While bifacial panels come with a higher initial cost, their higher energy generation and faster ROI make them a smarter investment in the long run.
Ready to go Solar ?
DMEGC Solar Panels: An Overview
When it comes to solar panels that balance innovation, reliability, and real-world performance, DMEGC panels stand out as one of the industry’s quiet powerhouses. Based in China and backed by over four decades of manufacturing expertise, DMEGC has built a global reputation for producing high-quality photovoltaic (PV) panels that perform exceptionally well in all kinds of conditions.
Solar4Good is a proud installer of DMEGC bifacial panels. We trust their performance and reliability, an ideal match for the UK’s varied climate. These panels are built for efficiency, durability, and long-term value, helping homeowners generate more clean energy and save more over time.
Key Features of DMEGC solar panels
- Manufacturing excellence: As a listed solar panel company under the Hengdian Group, DMEGC Solar brings over 45 years of manufacturing expertise, with 60 GW+ shipments and a solid Tier 1 Bloomberg ranking.
- Cutting-Edge Technology: DMEGC specialises in N-type TOPCon modules with efficiencies up to 23.5%, featuring low degradation and high bifaciality.
- Superior Performance Features: DMEGC panels excel in diverse lighting conditions, from cloudy skies to early mornings, thanks to their superior low-light response. For UK homeowners battling grey weather, this adds hundreds of pounds annually.
- Faster ROI: Because DMEG bifacial solar panels generate more energy, they offer a faster return on investment (ROI). Over time, you’ll recoup the initial installation costs and enjoy the benefits of lower energy bills.
What’s The Best Option for Your Home: Bifacial or Monofacial?
Making a choice between bifacial and monofacial solar panels depends on several factors, including budget, energy goals, and your roof setup. Here’s a quick glance through to help you decide
Choose Bifacial Panels If:
Choose Monofacial Panels If:
You want to maximise energy production, especially in areas with abundant reflected light (e.g., light-coloured roofs, pavements, or snow).
You’re on a tighter budget and need a more affordable option.
You’re willing to invest in higher-quality, long-term performance.
You live in an area with strong direct sunlight most of the year.
Underestimating Ongoing Costs
You should allocate a budget for inverter replacement (typically £1,500-£3,000 at years 10 and 20) and annual maintenance (£500-£1,500 depending on system size).
You want a system that performs well even in the UK’s unpredictable weather conditions. You have the budget to cover the initial higher cost.
You need a simpler installation and are not concerned with maximising efficiency.
Bottom Line:
The choice between bifacial and monofacial panels comes down to your home and goals. Bifacial panels offer extra energy from reflected light, making them ideal for UK roofs with light-coloured surfaces. Monofacial panels are simpler, more affordable, and still reliable for straightforward installations. Both reduce bills and carbon emissions; it’s just a matter of how much efficiency you want to gain, and we’re here to help you make the right choice.
Final Thoughts
Bifacial solar panels are not a futuristic upgrade; they’re a practical solution that helps UK homeowners make the most of every ray of sunlight, direct or reflected. With proven technology, longer lifespans, and increasing affordability, they’re fast becoming the go-to choice for anyone serious about energy independence and long-term savings.
If you’re ready to find out whether bifacial solar panels are the right fit for your property, Solar4Good can help. Our experts will assess your roof, lighting conditions, and energy needs to design a system that maximises your return on investment, whether that means bifacial or monofacial panels. Start your solar journey today with Solar4Good and turn every bit of sunlight into smarter savings
FAQs
Yes, especially if you’re looking to maximise your energy production. While they cost more initially, they provide better efficiency and a faster return on investment.
Bifacial panels have a lifespan of around 25–30 years, with some even offering better durability than traditional panels.
Yes, but to maximise performance, bifacial panels should be installed in areas where reflected light can increase energy production, such as on light-coloured roofs or concrete.
Yes, bifacial panels perform well in the UK’s variable weather, especially due to their ability to capture reflected sunlight from snow, concrete, or rooftops.