As solar energy becomes increasingly popular, selecting the right solar panel is essential for optimising energy production and return on investment. Among the key options are monofacial and bifacial solar panels, each with unique features suited to different applications. 

Monofacial panels generate electricity from sunlight on their front side, making them a simple and cost-effective choice. Bifacial panels, however, can generate power from both sides, capturing reflected light for potentially higher energy output, making them ideal for maximising solar efficiency.

Key Differences Between Monofacial and Bifacial Solar Panels

Solar panels are one of the most important components when harnessing solar energy. While traditional panels have been around for a long time, newer innovations like bifacial panels have taken the market by storm.
Let us discuss the key differences between monofacial and bifacial solar panels to help you understand which one might be best for your needs.

Design:

  • Monofacial are the classic solar panels you often see. They capture sunlight from only one side i.e. the front. The back is covered with an opaque material, usually white or black.

  • Bifacial panels are designed to absorb sunlight from both the front and back. The rear side of bifacial panels is often covered with a transparent back sheet or glass, allowing light to pass through and be absorbed from both sides. This dual-sided design can increase energy production, especially in environments with reflective surfaces like snow or light-coloured roofs.

Efficiency:

  • Monofacial panels only capture sunlight from the front, therefore their efficiency is limited to how much sunlight hits that side. They are still effective, but only as long as there’s direct sunlight on them.

  • Bifacial panels take advantage of sunlight reflected off surfaces like the ground or nearby buildings. This additional light absorption can boost their efficiency by as much as 30%, making them a smart choice for areas with high reflectivity like snowy or sandy environments.

Energy Output:

  • Energy output for monofacial panels is limited to the direct sunlight hitting the front. They’re ideal for homes and buildings where you can position them directly toward the sun

  • Bifacial panels produce significantly more energy due to the dual-sided light capture. If you install them in a space where the ground or surrounding area reflects light, you will see a noticeable boost in energy production.

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Cost

  • Monofacial panels are more affordable, making them a great option for homeowners and businesses looking to install solar power on a budget.

  • Bifacial panels tend to be more expensive upfront, their higher efficiency means they can offer a better return on investment over time due to the increased energy production.

Best Use Cases:

  • Monofacial panels are perfect for rooftops and areas where there isn’t much reflection from the ground. They work best in more standard setups where sunlight primarily hits them from above.

  • Bifacial panels thrive in wide open spaces, particularly where there are highly reflective surfaces like snow, water, or even light-coloured rooftops. They’re ideal for ground-mounted systems or commercial installations with room to maximise the rear-side benefits.

Installation Considerations:

  • Monofacial panels are generally easier to install, requiring standard mounting systems and Installation plays a significant role in the effectiveness of both monofacial and bifacial solar panels.

  • Bifacial panels require more planning and potentially higher upfront costs on elevated installations, specific tilts, and surfaces that reflect light well, like white concrete or snow-covered ground.

Durability:

  • Monofacial panels are sturdy and reliable, but because they have an opaque back, they can be more vulnerable to wear and tear if exposed from the rear side.

  • Bifacial panels often have a glass back, which not only lets in light but also provides extra protection from environmental factors like moisture and dust. This makes them more durable in the long run.

Different Environments:

  • Monofacial panels perform well in most settings, making them a versatile choice for urban rooftops and small installations.

  • Bifacial panels, however, excel in open areas with reflective surfaces, such as rural or industrial sites. In these environments, the additional light captured by the rear side can significantly boost energy production.

Shade and Reflection:

  • Monofacial Panels may experience reduced efficiency if partially shaded and shade can negatively impact the performance of both panel types, but bifacial panels can mitigate some of these effects by capturing ambient light on their rear side.

  • Reflection is another critical factor for bifacial panels; surfaces like snow, water, or light-coloured roofs can enhance their output. Monofacial panels do not benefit from these conditions.

A monofacial solar panel is shown with a sun above.
A bifacial solar panel is shown taking sunlight from two sides.

Government Incentives and Discounts:

  • Government incentives and rebates can influence the cost-effectiveness of solar panels. These programs often do not differentiate between monofacial and bifacial panels, offering similar benefits for both.

  • However, regions promoting higher solar efficiency may provide additional incentives for bifacial installations, making them more attractive in certain areas.

Future Trends

  • The simplicity, lower cost, and proven performance make Monofacial Panels a reliable choice for many applications. Advances in monofacial technology, such as improved cell efficiency and better materials, ensure that they will remain a viable option for solar installations.

  • Bifacial technology is rapidly evolving, with ongoing research focused on improving efficiency, reducing costs, and enhancing durability. Future innovations may include better reflective materials, more efficient rear-side cells, and advancements in transparent backing materials. As these technologies develop, bifacial panels may become even more competitive in the solar market.

FeatureMonofacial solar panelBifacial solar panel
Sunlight absorptionFront side onlyBoth front and rear sides
EfficiencyStandard efficiency, reliant on direct sunlightUp to 30% higher efficiency by using reflected light
Energy outputLimited to direct sunlightIncreased output from rear side reflection
DesignOpaque backingTransparent or semi transparent backing
Ideal useRooftops or non reflective areasOpen Spaces with reflective surfaces
DurabilityStandard durabilityMore durable with glass back design
CostLower upfront costHigher upfront cost but better long term ROI
AppearanceTraditional opaque panelsSleek modern transparent design

Conclusion

Monofacial panels are an excellent choice for those looking for a cost-effective, reliable solution with straightforward installation. They are particularly suited for environments where reflective surfaces are minimal, and space is limited. Bifacial panels are ideal for projects where maximising energy output is a priority, especially in areas with abundant reflected light. They are also well-suited for installations in open spaces where the rear side can capture additional sunlight. Whether you choose monofacial or bifacial panels, Alpex offers high-quality solar solutions tailored to meet your energy needs and maximise efficiency.

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FAQs

Bifacial panels can generate more energy by capturing sunlight on both sides, making them more efficient in certain conditions. They are ideal for installations in open spaces with reflective surfaces.

Bifacial panels can be worth the extra cost in environments where their dual-sided design maximises energy production. Over time, the additional energy output may offset the higher initial investment

Yes, bifacial panels can be installed in residential areas, but their performance may be less optimal compared to open or reflective environments. Monofacial panels might be more cost-effective for typical residential settings.

Government incentives generally apply to both panel types. However, in regions promoting higher efficiency, additional incentives may favour bifacial panels, making them a more attractive option in those areas.

Author : Lakhan Singh

Lakhan, an industry veteran with 34 years of experience, joined Alpex in 2020 and leads plant operations. He ensures overall responsibility for high-quality photovoltaic solar panel production, focusing on cost efficiency, productivity, and technology upgrades in line with market trends.