Australia is one of the largest solar markets, with rising electricity prices and growing demand for renewable energy due to abundant sunshine. Businesses, farmers, and homeowners seek to maximize energy production, so choosing the right solar technology is crucial.
Monofacial and bifacial are two dominating technologies in the solar market. Monofacial solar panels have been used for decades, and bifacial solar panels are becoming popular for generating electricity from both the front and rear sides. This guide compares bifacial solar panels vs monofacial solar panels to help you understand which technology performs best in different Australian environments.
What are Monofacial Solar Panels?
Monofacial solar panels generate electricity from the rear or front side. They are made from a single, highly purified crystal of silicone. These panels are commonly used in residential and commercial setups.
When monofacial panels are exposed to sunlight, PV cells convert solar energy into electricity. The rear side of these panels is usually covered with an opaque protective backsheet (silver, black, or white). This sheet prevents monofacial solar panels from capturing reflected sunlight.
Top benefits of monofacial solar panels include the lightweight structure, lower upfront cost, easier installation, long-term performance, and suitability for conventional rooftop setups.
What are Bifacial Solar Panels?
Bifacial solar panels generate electricity from both front and back (rear) sides. These panels use a transparent backsheet or glass (instead of the opaque backsheet used in monofacial panels) to allow reflected sunlight to reach the rear-side solar cells.
Remember, the rear side of bifacial solar panels does not receive direct sunlight; it captures scattered and reflected sunlight from surrounding surfaces, such as snow, sand, concrete, water, and light-colored ground cover.
Top advantages of bifacial solar panels include improved low-light performance, better land utilization, higher energy yield, better performance in reflective environments, and longer lifespan.
Bifacial Solar Panels vs Monofacial: Performance in Different Australian Environments
This section compares the performance of monofacial and bifacial solar panels in different Australian conditions.
Residential Rooftops
Generally, monofacial panels are considered the best choice for residential installations because panels are mounted close to the roof surface, roofs offer limited back-side exposure, installation costs are lower, and performance remains predictable. Many suburban homes don’t provide enough reflected sunlight to fully benefit from bifacial panels.
Though bifacial solar panels can be installed for residential applications, the gains are often modest. Limited reflected light reaches the rear side of these panels.
Commercial Flat Roofs
If budget is a priority for commercial installations, monofacial solar panels offer a cost-effective solution for electricity production. They come with minimal design complexity and reliable energy generation.
On the other hand, bifacial solar panels generate maximum electricity when installed above reflective roofing materials, e.g., light-colored surfaces or white membranes.
Benefits of installing bifacial panels on commercial buildings include better use of available roofspace, enhanced annual energy production, and improved economics over time.
Commercial properties allow installers to elevate panels above the roof surface. It ensures maximum reflected sunlight reaches the rear side of the panels.
Solar Farms
Large-scale solar installation projects enable developers to optimize every aspect of solar system design, such as ground treatment, panel height, tracking systems, and row spacing. These factors help maximize rear-side capture.
Typically, solar farms are ground-mounted and are installed on large reflective surfaces. Therefore, bifacial solar panels are better than monofacial panels in this specific environment.
Desert and Outback Regions
Australian desert and outback regions are one of the best environments in the world for bifacial solar panels because the conditions strongly favor rear-side reflected light capture. Very high solar irradiance in regions like the Nullarbor Plain and the Pilbara increases overall energy production.
Low cloud cover and clear skies are added benefits, as they provide more consistent direct and diffuse sunlight year-round. Similarly, dry soil and light-colored sand reflect more sunlight than darker agricultural land. It enhances rear-side generation.
Rear-side capture makes bifacial solar panels more suitable than monofacial solar panels for deserts and outback regions in Australia.
Agricultural Solar Installations
The integration of agriculture and solar energy, also known as agrivoltaics, is gaining popularity across Australia. Farmers are more focused on installing solar systems above vineyards, crops, and grazing lands.
Agricultural lands offer more favorable conditions for bifacial solar technology because solar panels are elevated above the ground, structures are designed to increase airflow, open space exists beneath the modules, and vegetation/soil reflect sunlight. All these factors improve rear-side capture of sunlight.
Monofacial panels can perform well under direct sunlight, but they miss rear-side capture. Bifacial panels are attractive for horticultural projects, cropping systems, and sheep grazing operations.
Coastal Areas
Bifacial solar panels in Australian coastal regions outperform monofacial panels, but the benefit is moderate and mainly depends on site design and surface reflectivity. Bifacial panels produce electricity from both direct sunlight on the front of the modules and reflected light from water, sand, and nearby surfaces.
Beach-adjacent solar sites or coastal environments like the Gold Coast benefit from high diffuse light from ocean reflection, light-colored sand with moderate reflectivity, clear skies, and higher solar irradiation in many regions.
The sea surfaces reflect sunlight poorly, resulting in limited bifacial gain. In some coastal regions, variability in cloud cover reduces the consistency of direct irradiance. Similarly, humidity and salt mist may cause corrosion and soiling, which reduce overall solar panel efficiency if not properly maintained.
Simply put, installation height and reflective sand help bifacial panels produce more electricity than monofacial panels in coastal regions. However, factors such as humidity and salt require special attention.
Other Differences between Bifacial and Monofacial Solar Panels
Monofacial and bifacial solar panels also differ in design, efficiency, cost, energy output, durability, and installation flexibility. Let’s look at each factor one by one.
Design
Monofacial solar panels can only absorb sunlight from their front-side modules, whereas bifacial panels have a dual-sided design to capture light reflected from the ground or nearby surfaces, as stated earlier.
Efficiency
The efficiency of monofacial solar panels depends on how much direct sunlight they receive, as they can capture sunlight from one side. Whereas bifacial solar panels, due to their ability to capture reflected light, can be up to 30% more efficient than monofacial panels.
Cost
Cost-effectiveness makes monofacial panels a great option for Australian businesses and homeowners who prefer installing affordable solar systems. In contrast, bifacial panels are expensive upfront, but they can provide a better return on investment due to higher electricity generation.
Energy Output
Monofacial panels produce less electricity because they capture sunlight only from the front. In contrast, the dual-sided light-capture capability of bifacial solar panels helps them generate more electricity. If you install bifacial solar panels on surfaces that receive reflected sunlight, you will see a noticeable increase in energy output.
Durability
Most monofacial solar panels use a polymer backsheet. Humidity, UV exposure, and heat can degrade this sheet over time. These panels are more sensitive to microcracking and moisture-related aging in harsh environments.
Whereas bifacial solar panels have glass on both front and back sides, which provides better resistance to moisture ingress. Moreover, they perform better in snow and high wind pressure and have slower long-term degradation rates.
Installation Flexibility
Monofacial solar panels offer faster and easier installation. They are more flexible for tight spaces and rooftops. They can be mounted on standard racks or closer to the ground. These panels are less sensitive to design details like ground conditions or height.
Bifacial solar panels are heavier and are installed higher above the ground to capture reflected light. They need a more careful system design to achieve maximum rear-side gain.
In terms of installation flexibility, monofacial panels are a clear winner, as they offer cost-effective, flexible, and simple installation.
Final Words
Bifacial solar panels capture reflected sunlight that conventional (monofacial) panels leave behind, helping them produce more electricity. However, the performance of bifacial panels largely depends on the surrounding environment.
In Australia’s white-roof commercial projects, agrivoltaic setups, and utility-scale solar farms, bifacial panels offer long-term and more efficient solar energy solutions.
In contrast, the average suburban rooftop in Perth, Melbourne, Sydney, and Brisbane often lacks the reflective surfaces and cannot unlock the full benefits of bifacial technology.
High-quality monofacial solar panels are the most affordable choice for most Australian homeowners.
FAQs
Are bifacial solar panels better than monofacial solar panels?
It depends on the installation environment. Choose monofacial solar panels if you need straightforward installation, rear-side exposure is limited, you have a standard residential rooftop, or budget is your primary concern.
Choose bifacial panels if your site has reflective surfaces, you need a ground-mounted system, you operate an agricultural property or farm, or you have a commercial facility.
How much additional energy do bifacial solar panels produce?
Generally, bifacial panels generate 1-10% more energy on residential rooftops, 10-20% more energy on commercial flat roofs, 10-25% more energy on ground-mounted solar setups, and up to 30% more energy in high-reflectivity environments such as white surfaces or deserts.
Do bifacial panels perform better in hot climates like Australia?
Yes, Australia offers abundant sunlight and reflective surfaces that make bifacial technology ideal for many regions, especially in deserts and inland areas.
Do bifacial panels last longer than monofacial solar panels?
Yes, bifacial panels tend to last longer in most cases due to their dual-glass construction, which improves resistance to environmental degradation, moisture, and heat.
