As the demand for cleaner, more efficient energy sources accelerates, bifacial solar panels are emerging as a powerful innovation in solar technology.
Whether installed over reflective surfaces like white rooftops, snow, or sand, these double-sided photovoltaic systems are reshaping how energy is harvested in both residential and industrial settings.
Let’s explore their advantages, real-world applications, and whether they’re the right fit for your smart solar energy system in Malaysia.
What are bifacial solar panels?
Bifacial solar panels are a type of photovoltaic (PV) module engineered to absorb sunlight on both the front and rear surfaces, unlike traditional monofacial panels that generate electricity from only one side. These panels are typically made with transparent backsheets or dual layers of tempered glass, allowing light reflected from the ground (called albedo) to reach the rear cells.
Structurally, they use bifacial solar cells—often based on passivated emitter rear contact (PERC) or n-type TOPCon technology—which enable higher efficiency and improved thermal stability. This dual-sided configuration boosts overall energy yield, especially when installed in high-reflectivity environments such as concrete, snow, sand, or white roofing.
Key characteristics:
- Frontside captures direct sunlight
- Backside collects diffused or reflected light
- Built using glass-glass or glass-transparent backsheet materials
- Mounted on elevated or tilted racking systems to maximise rear exposure
Bifacial modules are compatible with both fixed-tilt and tracking systems, making them suitable for diverse installations — from commercial rooftops and ground-mounted solar farms to vertical solar fences and floating solar platforms.
For systems that require dependable performance across changing surface conditions, the Astro N7 bifacial panels provide reliable output with low degradation and TOPCon 4.0 cell technology.
How do bifacial panels work?
Bifacial solar panels generate electricity by capturing sunlight from both the front and back sides of the panel. The front side functions like a conventional photovoltaic panel, absorbing direct sunlight and converting it into electrical energy. What sets bifacial panels apart is their transparent or reflective back layer, which allows ambient or reflected light—known as albedo light—to reach the rear-side solar cells.
When installed above high-reflectivity surfaces such as white gravel, concrete, snow, or water, the rear side can significantly increase total energy output. This is especially effective when panels are mounted on elevated racking systems, which improve air circulation and light access underneath.
Key components involved:
- Photovoltaic cells: Usually based on high-efficiency PERC or n-type technologies
- Bifaciality factor: Measures the rear side’s performance as a percentage of the front side
- Reflective surface: Determines how much light reaches the rear cells
- Mounting structure: Affects tilt, elevation, and exposure to ground reflection
Some systems incorporate single-axis or dual-axis solar trackers, which adjust the panel angle throughout the day to optimise sun exposure on both sides. As a result, bifacial modules often deliver 10 to 30 percent more energy output compared to monofacial panels under the right conditions.
Benefits of bifacial solar technology
Bifacial solar panels offer several key advantages over traditional monofacial systems, particularly when optimised for high-reflectivity environments. These benefits go beyond energy generation, impacting financial returns, space efficiency, and long-term system resilience.
1. Higher energy yield
By harvesting sunlight from both sides, bifacial panels can produce 10 to 30 percent more energy, depending on the installation surface and tilt angle. The additional output significantly improves the specific yield (kWh per kWp), especially in open or snow-covered areas.
2. Improved return on investment (ROI)
The extra energy captured by the rear side translates to faster payback periods and greater long-term savings. While initial costs are slightly higher, the levelised cost of electricity (LCOE) often becomes lower over the lifespan of the system.
3. Durability and longevity
Most bifacial modules use glass-glass construction, which enhances resistance to environmental stress such as wind, humidity, and mechanical load. This extends the panel’s performance warranty, often up to 30 years.
4. Space optimisation
Because they generate more power per panel, bifacial modules allow designers to achieve higher output using fewer panels. This is especially useful in space-constrained installations like urban rooftops or small-scale commercial sites.
Ideal installation environments
The performance of bifacial solar panels is highly influenced by the environment in which they are installed. While they can be used in many of the same applications as monofacial panels, certain conditions significantly enhance their efficiency and return.
Before committing, many homeowners and businesses use a solar NEM calculator to estimate system savings based on roof size and energy usage.
High-albedo surfaces
Bifacial panels generate more power when placed above surfaces that reflect sunlight. These include concrete, white membrane rooftops, sand, snow, and light-coloured gravel. The stronger the reflectivity, the greater the rear-side energy contribution.
Elevated or angled mounting
Installing bifacial panels on raised structures improves airflow and allows more reflected light to reach the rear side. Systems with tilt angles between 10 to 30 degrees often achieve optimal exposure. This makes them well-suited for carports, canopies, and ground-mounted arrays.
Open surroundings
Installations with minimal shading and open perimeters benefit the most from bifacial technology. Shaded or enclosed environments reduce the amount of rear irradiance and limit performance gains.
Vertical applications
Bifacial modules are increasingly used in vertical setups such as fences, noise barriers, and perimeter enclosures. In these cases, both sides can receive sunlight during different times of the day, making them especially effective for east-west orientations.
Floating solar platforms
In water-based solar farms, the reflective properties of water enhance the effectiveness of bifacial modules. These systems can also benefit from the natural cooling effect of water, which improves panel efficiency.
By carefully selecting the right environment, system designers can unlock the full potential of bifacial technology and achieve superior long-term energy production.
Challenges and considerations
While bifacial solar panels offer compelling benefits, they also come with specific limitations and factors that should be addressed during the planning and installation phases. Understanding these challenges helps ensure that the system delivers the expected performance and return.
Higher upfront costs
Bifacial modules typically cost more than standard monofacial panels due to their advanced materials and manufacturing processes. Additionally, installation may involve customised mounting systems or reflectivity-enhancing surfaces, which can further raise project costs.
Complex installation requirements
To optimise rear-side exposure, bifacial panels must be installed with precision. This includes maintaining adequate clearance from the ground, selecting the right tilt angle, and avoiding obstructions that could cast shadows. These requirements may increase labour time and design complexity.
Performance variability
Unlike monofacial systems, the energy output of bifacial panels depends heavily on the surrounding environment. Sites with low surface reflectivity or frequent shading may not experience the full performance advantage. This makes site assessment a critical step before deployment.
Limited compatibility with certain rooftops
Some residential rooftops, especially sloped or shaded ones, may not provide the ideal conditions for bifacial modules. In such cases, traditional monofacial panels may offer better cost-efficiency with simpler installation.
Monitoring and modelling limitations
Standard energy yield simulation tools may not accurately predict bifacial performance, especially for the rear side. More advanced software or empirical data is often required to estimate real-world output, which may not be available for all projects.
By addressing these considerations early, installers and system owners can make informed decisions and avoid underperformance or budget overruns.
Are bifacial panels right for you?
Bifacial solar panels offer measurable advantages, but they are not the best fit for every installation. Whether you are a homeowner or a commercial property owner, assessing the suitability of bifacial modules requires a close look at your site conditions, energy goals, and budget.
Start by evaluating the physical environment. If your property includes surfaces with high reflectivity, such as concrete, sand, or snow, bifacial panels are likely to deliver a meaningful boost in energy output. Open spaces with minimal shading are also ideal, as rear-side exposure plays a critical role in overall performance.
Consider your system’s structural setup. Bifacial modules perform best when mounted on elevated racking or tracking systems that allow reflected light to reach the rear side. If your installation site cannot accommodate these configurations due to design or structural limitations, the performance advantage may be reduced.
Cost is another key factor. While bifacial technology offers long-term savings, the initial investment is generally higher. For homeowners with limited budgets, monofacial systems may offer a faster payback. However, businesses or utility-scale projects may benefit from the long-term efficiency and durability gains that bifacial modules provide.
Lastly, review your energy goals. If your objective is to maximise output per square metre or future-proof your installation with cutting-edge solar design, bifacial panels present a compelling option. On the other hand, if simplicity, lower upfront cost, or installation speed are your main priorities, standard solar panels may remain the better choice.
Bifacial solar panels offer a smart upgrade for those seeking better energy yield and long-term efficiency. Their ability to capture light from both sides makes them ideal for reflective surfaces and open, unshaded areas.
Trust in Malaysia’s leading solar PV system supplier
To maximise these benefits, working with the right supplier is crucial. Unitrade is one of Malaysia’s leading providers of high-efficiency solar PV systems, offering Huawei-certified inverters, premium bifacial modules like the Astro N-series, and full support for NEM 3.0 integration.
With a strong engineering background and end-to-end project execution, Unitrade delivers tailored solar solutions for both residential and commercial needs.