How Bifacial Solar Panels Increase Energy Output

Quick Answer: Bifacial solar panels generate electricity from both the front and rear sides of the module, allowing them to capture direct, reflected, and diffused sunlight. When installed in suitable conditions, they can typically produce 5–20% more energy than comparable monofacial panels. They are particularly well suited to installations that maximise rear-side light capture, such as ground-mounted systems, solar carports, and some commercial rooftops.

As solar technology continues to advance, efficiency remains one of the biggest priorities for homeowners, businesses, and project developers. One innovation gaining attention is bifacial solar panels, which are designed to generate more electricity by capturing sunlight from both sides of the module.

Unlike traditional solar panels that only absorb sunlight from the front, bifacial technology makes use of reflected and diffused light that would otherwise go unused. This can increase overall energy production without requiring additional roof or ground space.

In this guide, we'll explain how bifacial solar panels work, how they compare with traditional monofacial panels, the conditions that maximise their performance, and how REA Power's advanced solar technologies support higher energy generation.

What Are Bifacial Solar Panels?

Bifacial solar panels are photovoltaic (PV) modules that generate electricity from both the front and rear sides of the panel.

The front surface captures direct sunlight just like a conventional solar panel. The transparent rear side, however, also converts sunlight reflected from the ground and nearby surfaces into additional electricity. By making use of this extra light, bifacial modules can increase overall system output under the right installation conditions.

Most modern bifacial modules feature dual-glass construction, replacing the traditional opaque backsheet with a second layer of tempered glass. This design allows more light to reach the rear solar cells while improving durability, weather resistance, and long-term performance.

How Do Bifacial Solar Panels Produce More Energy?

The key advantage of bifacial solar panels is their ability to capture reflected and diffused sunlight.

When sunlight reaches the ground or surrounding surfaces, part of it is reflected back towards the rear of the panel. Unlike monofacial modules, bifacial panels convert this reflected light into additional electricity, increasing total energy production.

Several factors influence how much extra energy a bifacial panel can generate.

Ground Reflectivity (Albedo)

The amount of reflected sunlight depends largely on the surface below the solar panels. This property is known as ground albedo.

Highly reflective surfaces include:

• White gravel
• Concrete
• Light-coloured roofing materials
• Reflective roof membranes
• Snow

Darker surfaces such as asphalt, grass, or soil absorb more sunlight and generally provide lower bifacial gains.

Mounting Height

The space between the panel and the surface below also affects performance.

Elevated installations allow more reflected sunlight to reach the rear cells, making ground-mounted systems, solar carports, and raised rooftop installations particularly well suited to bifacial technology.

System Design

Panel tilt, spacing, shading, orientation, and local environmental conditions all influence how much additional energy can be generated. A professionally designed system helps maximise the performance of bifacial solar panels based on the specific installation site.

Bifacial vs Monofacial Solar Panels

Understanding bifacial vs monofacial technology helps determine which solution is best suited to your project.

Monofacial panels remain an excellent option for many residential systems. However, bifacial solar panels can generate additional electricity without increasing the number of installed modules, making them an attractive choice where installation conditions allow effective rear-side light capture.

How Much More Energy Can Bifacial Solar Panels Produce?

There is no single figure that applies to every installation, as performance depends on the design of the solar system and the surrounding environment.

In many applications, bifacial solar panels can generate approximately 5–20% more electricity than comparable monofacial panels. The highest gains are generally achieved in elevated or ground-mounted installations with highly reflective surfaces, while standard pitched residential roofs typically see more modest improvements. Systems installed over highly reflective surfaces with adequate mounting height may achieve even greater energy gains.

Rather than focusing on a fixed percentage, it's more useful to consider the factors that influence performance. Ground reflectivity, mounting height, system layout, and local climate all play an important role in determining how much additional energy bifacial technology can deliver over the lifetime of the system.

Best Installation Conditions for Bifacial Solar Panels

Bifacial solar panels can be installed in a variety of environments, but some installations provide greater opportunities for rear-side light capture than others.

The best conditions for maximising energy output include:

Ground-mounted arrays and solar carports often achieve the greatest energy gains because the panels are elevated, allowing more reflected sunlight to reach the rear cells. Commercial buildings with light-coloured roofing materials or reflective roof membranes can also benefit from increased rear-side energy capture.

Standard residential rooftops can still benefit from bifacial technology, although rear-side energy gains are typically more modest than in elevated or ground-mounted systems because the panels are mounted closer to the roof surface. The overall performance depends on factors such as roof design, mounting system, surrounding surfaces, and local environmental conditions.

How REA Power's Type X Technology Supports Higher Performance

High-performing solar panels rely on more than just bifacial technology. REA Power's Type X solar modules combine a bifacial dual-glass design with N-Type and Back-contact Cell Technology to improve efficiency, durability, and long-term energy production.

The dual-glass construction allows the rear side of the module to capture reflected sunlight while helping protect the solar cells from environmental exposure. Combined with advanced cell architecture, Type X modules are engineered to reduce electrical losses and deliver reliable performance across residential, commercial, and utility-scale applications.

For projects seeking a simplified installation, REA Power also offers a Bifacial AC Solar Module with an integrated microinverter, providing module-level power conversion while retaining the benefits of bifacial energy generation.

Are Bifacial Solar Panels Worth It?

For many projects, the answer is yes—but the benefits depend on how and where the system is installed.

Residential Systems

Homeowners can benefit from bifacial solar panels, particularly where elevated mounting systems, flat roofs, pergolas, or light-coloured roofing materials allow more reflected sunlight to reach the rear of the modules. On conventional pitched roofs, however, the additional energy gain is generally smaller than in installations with greater rear-side light exposure.

Commercial and Utility-Scale Projects

Commercial buildings and large-scale solar developments often provide ideal conditions for bifacial technology. Flat roofs, solar carports, and ground-mounted systems typically allow greater rear-side light capture, helping maximise electricity generation and improve long-term returns on investment.

Why Choose REA Power?

Choosing a solar manufacturer means looking beyond panel efficiency alone. Quality engineering, product reliability, and ongoing innovation all contribute to long-term system performance.

REA Power develops advanced solar technologies for residential, commercial, and utility-scale energy projects across Australia, the UK, Europe, and other international markets. Its product range includes high-performance solar modules featuring N-Type cell architecture, Back-contact Cell Technology, dual-glass bifacial designs, and integrated AC solar solutions.

Designed for long-term reliability and backed by comprehensive product and performance warranties, REA Power's solar technologies help customers achieve dependable energy generation across a wide range of climates and installation environments.

Key Takeaways

Bifacial solar panels offer an effective way to increase solar energy production by capturing sunlight from both the front and rear of the module. When installed in suitable conditions, they can generate more electricity than traditional monofacial panels without increasing the number of solar modules required.

While the level of additional energy depends on factors such as ground reflectivity, mounting height, and system design, bifacial technology can improve the long-term performance and value of residential, commercial, and utility-scale solar systems.

If you're exploring advanced solar solutions, REA Power offers innovative technologies designed to maximise efficiency, durability, and long-term performance.

Ready to learn more? Contact REA Power on 1300 360 047 or visit https://reapower.com.au/pages/contact to speak with our team about the right solar and battery solution for your project.

Frequently Asked Questions

How much extra energy do bifacial solar panels produce?

Bifacial solar panels typically generate 5% to 20% more electricity under suitable installation conditions. Standard pitched residential roofs usually achieve smaller gains than elevated or ground-mounted systems, as performance depends on installation height, ground reflectivity, panel spacing, and overall system design.

Do bifacial panels work on a normal roof installation?

Yes. Bifacial panels can be installed on standard residential roofs, although the additional energy gain is usually smaller than in elevated or ground-mounted systems where more reflected sunlight reaches the rear of the module.

Are bifacial solar panels worth the additional investment?

They can be. Projects with favourable installation conditions often achieve higher lifetime energy production, improving the overall value of the solar system. A professional assessment can help determine whether bifacial technology is the right choice for your property.

What conditions are best for bifacial solar panels?

Bifacial solar panels perform best when installed above reflective surfaces with adequate clearance beneath the modules. Ground-mounted systems, solar carports, elevated rooftops, and commercial buildings with reflective roofing materials generally provide the greatest rear-side energy gains.