Busting the Bi-Facial Myth for Roof-Mounted Solar Panels at 10 Degrees Inclination

In recent years, solar energy has become a prominent topic for homeowners in Malta, leading many to consider investing in roof-mounted solar panels. Among the options available, bi-facial solar panels have emerged as a popular subject of marketing hype. However, it's crucial to distinguish between genuine benefits and inflated claims, especially when it comes to performance at specific inclinations. In this post, we will explore the misconceptions surrounding bifacial solar panels rated at 580 W, which are often misleadingly promoted as generating 900 W or higher, simply due to their design.

View of solar panels roof-mounted installation.

Understanding Bi-Facial Solar Panels

Bi-facial solar panels are designed to capture sunlight not only from the front but also from the rear, potentially improving their efficiency. This technology seems promising, as it theoretically allows for increased energy generation. However, as with many technologies, the benefits can vary significantly based on specific conditions.

The Allure of Higher Power Ratings

Marketing campaigns frequently tout the higher potential output of bi-facial panels. While it's true that these panels can capture reflected sunlight, the actual gains are often overstated. Many homeowners may be led to believe that their bi-facial solar panels will perform considerably better than traditional panels, particularly at low inclinations like 10 degrees.

To put this into perspective, consider a scenario where a residential roof is equipped with bi-facial panels. The panels may nominally support a higher output, but numerous factors dictate how much of that potential is realized. For example, the amount of light reflected from the ground depends heavily on the surface type, angle of incidence, and even local weather conditions.

Close-up view showcasing the installation of a rooftop solar system at 10 degrees inclination.

The Reality of Low-Inclination Gains

At an inclination of just 10 degrees, the effectiveness of bi-facial panels is considerably diminished. Reflective surfaces like white concrete or light-colored rooftops are necessary to enhance light capture, yet the conditions for optimal performance rarely align in residential settings. This does not mean bi-facial panels are ineffective; it simply indicates that the expected gains are unrealistic under certain conditions.

Studies have shown that the actual reflective gain at lower inclinations can be marginal. According to industry standards, the typical enhancement for bi-facial panels ranges from 5% to 15%. However, this is normally if panels are installed at heights of 1.5 m from the ground. This is still significantly lower than the marketed numbers often presented to consumers. When one considers that most rooftop solar panels are installed close to ground and at low inclinations, these numbers can be actually lower. Therefore when evaluating solar panel options, it’s vital to consider the real-world applicability of these promised gains.

Focus on the Front-Face Power Rating

When deciding between solar panel options, it's essential to focus primarily on the power rating of the front face of the panel for rooftop mounted systems. The effectiveness of the front face is a more stable indicator of the energy your solar panel can produce. Many customers misguidedly fixate on the supposed additional output from the rear side, which may not be guaranteed.

The front-side rating provides a more accurate picture of performance based on real-world lighting conditions. Considering that bi-facial gains are susceptible to various factors, homeowners should prioritize panels with proven front-face efficiencies instead of inflated total output numbers.

High angle view illustrating a SunPower Maxeon flat rooftop installation in the Maltese Islands .

Debunking Misleading Marketing

In Malta's current solar market, numerous misleading marketing campaigns are exploiting the confusion surrounding bi-facial panels. By presenting bi-facial panels in comparison to traditional panels without proper context, suppliers can mislead consumers into believing they're receiving significantly more power for their investment.

By understanding the actual performance capabilities of bi-facial panels, homeowners can make informed decisions based on factual data rather than enticing marketing claims. The sun's strength on the solar panels is primarily n the front face of the panel. That is the reality.

The Bottom Line: Making Informed Decisions

In conclusion, while bi-facial solar panels offer a compelling narrative, it is essential to scrutinize their actual performance in real-world applications, especially at inclinations of 10 degrees. Discerning the difference between marketing hype and factual data can save you money and maximize your solar investment.

For residential customers in Malta, the focus should remain on transparent, reliable power ratings that reflect the actual capabilities of the solar technology being considered. Don’t get caught up in glamorous numbers that sound good on paper but may not deliver under your specific circumstances.

In choosing the right solar panel for your home, remember that clarity is key. for rooftop systems, the primary factor should always be the wattage indicated for the front face of the solar panel. Any additional benefits form the underside is a bonus.

The Path Forward: Embrace Knowledge

Consulting with an expert may provide additional clarity and ensure your investment aligns with realistic expectations. At Alternative Technologies ltd, we will always be factual, honest and transparent. We will not play with numbers and figures to sugar coat an offer.

Remember, knowledge is your best ally in making informed choices for your renewable energy needs. Explore various products, compare front-face power ratings, and make decisions based on understanding rather than hype. By doing so, you will find a system that meets your needs and contributes positively to your energy consumption and financial situation.