When deciding to invest in solar energy, one of the most important choices you’ll face is the type of panel technology to install: bifacial or monofacial solar panels.
Both have their advantages but understanding the key differences, benefits, costs, and suitability in the UK climate will help you make the most informed decision for your property, whether you’re a homeowner, landlord, or managing a commercial site.
With energy bills continuing to rise and government grants still available for solar PV installation, now is the ideal time to explore your options.
What’s the Difference Between Bifacial and Monofacial Solar Panels?
The fundamental difference lies in energy capture. Monofacial solar panels absorb sunlight from only one side, the front.
In contrast, bifacial panels absorb sunlight from both the front and back surfaces, allowing them to harness reflected and diffused light from surroundings like rooftops, gravel, snow, or reflective membranes.
| Feature | Monofacial Panels | Bifacial Panels |
|---|---|---|
| Light Absorption | Front side only | Both front and back |
| Efficiency (under ideal setup) | ~18–20% | 22%+ (can be up to 27% with reflection) |
| Installation Style | Rooftop (flush mount) | Rooftop, elevated, ground-mounted |
| Cost | Cheaper upfront | Higher initial cost but better ROI |
| Best for UK Weather? | Good | Better with the right installation |
Are Bifacial Solar Panels Worth It in the UK?
Yes, bifacial panels can be highly effective in the UK, especially in areas where space allows for optimal tilt or elevated mounting systems.
While the UK doesn’t get as much direct sunlight as sunnier countries, it excels in diffused light, which bifacial panels can utilise more effectively.
According to the UK Met Office, the North East region receives an average of 1,200–1,500 hours of sunshine annually, meaning bifacial panels can still deliver impressive gains.
Additionally, studies have shown that bifacial panels can yield up to 11–30% more energy than monofacial panels in certain setups.
This can be especially useful when trying to maximise output on limited roof space, which also ties into how many solar panels you can fit on your roof.
How Do Installation Conditions Affect Performance?
Performance depends significantly on how panels are mounted and what surfaces surround them. Here’s how different conditions compare:
Best Conditions for Bifacial Panels:
- Elevated or tilted installations with air gaps
- Reflective ground surfaces (e.g., white roofing membrane, concrete, gravel)
- Minimal shading from nearby structures
Less Ideal:
- Flush-mounted on dark, non-reflective roofs
- Heavy tree coverage or shadowing
If your property has a flat roof or open ground space, bifacial panels could be a very smart investment.
If your property has a flat roof or open ground space, bifacial panels could be a very smart investment.
For flat setups specifically, there’s growing interest in whether you can install solar panels on a flat roof, and yes, you can, with elevated racking systems to support bifacial performance.
Are Bifacial Panels More Expensive Than Monofacial Panels?
Typically, yes, bifacial panels come at a 10–20% higher cost than standard monofacial options. However, the increased energy output often balances this out over time.
Cost Breakdown (approximate UK figures):
- Monofacial panels: £5,500–£7,500 for a 4kW system
- Bifacial panels: £6,500–£9,000 for a 4kW system (incl. installation)
Still, total cost varies depending on roof type, access, inverter choice, and system configuration.
Additionally, your roof type matters, and some materials like rubber or concrete roofs have specific considerations when it comes to panel installation. Read our guide to understand how solar panels can be installed on rubber roofs.
For a tailored quote, Future Heat provides local, expert solar panel installation in Tyne and Wear, Newcastle, and across the North East.
Can You Get UK Government Grants for Solar Panels?
Absolutely, especially for homeowners and landlords improving energy efficiency. You may be eligible for one of the following schemes:
ECO4 Scheme (Energy Company Obligation)
- The ECO4 scheme supports low-income households to install renewable systems like solar PV.
Smart Export Guarantee (SEG)
- The Smart Export Guarantee (SEG) allows you to get paid for surplus solar electricity exported back to the grid.
- All major UK energy suppliers must offer SEG tariffs.
Zero VAT on Solar (until 2027)
- Solar panel systems and installations are currently 0% VAT-rated in the UK.
- Official GOV UK source
These grants and incentives significantly reduce payback periods, especially when using bifacial panels to maximise output.
If you’re trying to work out the return, you may be wondering how long it takes for solar panels to pay for themselves. Bifacial systems often shorten that payback window due to higher efficiency.
Which Type of Solar Panel Should You Choose?
Here’s how to decide:
Choose Monofacial if:
- You have a sloped roof with limited space.
- Budget is a key consideration.
- Aesthetics matter more (monofacial panels tend to be sleeker).
Choose Bifacial if:
- You want maximum energy output per panel.
- Your installation allows for ground mounting or elevated flat-roof installation.
- You’re planning for long-term savings and can invest a bit more upfront.
Both types qualify for grants and incentives, but your setup will determine what’s optimal.
If you’re unsure how to go about it, understanding how to choose a solar panel installer is just as important as selecting the right panel type.
How Long Do Bifacial and Monofacial Panels Last?
Both panel types have a lifespan of 25–30 years. They also come with performance warranties:
- Monofacial: 80–85% output guarantee after 25 years
- Bifacial: 85–90% output guarantee after 30 years (depending on manufacturer)
In terms of durability, bifacial panels often use glass on both sides, making them more robust, although slightly heavier.
Frequently Asked Questions (FAQs)
Technically yes, but it’s not recommended unless both types are on separate MPPT (Maximum Power Point Tracking) inputs. Mixing can lead to efficiency losses.
Yes. Bifacial panels typically use dual-glass construction, making them 2–5 kg heavier per panel, which may require a stronger mounting system.
They will still operate from front-side exposure, but rear-side performance may drop. Clearing debris or snow is advised for maximum gain.
Yes — landlords can offset solar installation costs against rental income for tax purposes. Consult a tax advisor or HMRC property income guide.
Absolutely. Bifacial panels are ideal for solar canopies, pergolas, carports, and even agrivoltaics, thanks to their dual-sided generation and transparency.
Our Verdict
Choosing between bifacial vs monofacial solar panels ultimately comes down to your site conditions, energy goals, and budget. In the UK where diffused light and reflective surfaces are common, bifacial panels offer a compelling case for long-term energy gains.
But monofacial panels remain cost-effective and reliable for most standard installations.
Regardless of your choice, pairing your system with government grants, zero VAT, and SEG payments makes solar more affordable than ever.
Myles Robinson is a seasoned expert in the boiler and home improvement industry, with over a decade of experience. He is deeply committed to environmental sustainability, actively promoting energy-efficient heating solutions to help households reduce their carbon footprint. By combining industry expertise with a dedication to environmental responsibility, Myles continues to lead efforts in transforming home heating practices towards a more sustainable future.
