How can double-sided double-glass topcon monocrystalline solar photovoltaic modules improve the system efficiency of double-glass modules in hot regions?
Publish Time: 2025-10-21
Amid the global energy transition, photovoltaic power generation is rapidly expanding into high-temperature, high-irradiation regions, such as the Middle East, North Africa, western China, and India. However, high temperatures pose a significant challenge to the power generation performance of traditional photovoltaic modules: as temperatures rise, the open-circuit voltage of the cells decreases, resulting in power output degradation and lowering the overall system efficiency. The double-sided double-glass topcon monocrystalline solar photovoltaic module, with its excellent temperature characteristics, bifacial power generation capabilities, and high reliability, is an ideal choice for photovoltaic power plants in hot regions, significantly improving the actual power generation efficiency of the system in high-temperature environments.1. Excellent Temperature Coefficient: Reduced High-Temperature Power LossesThe power generation efficiency of photovoltaic modules is significantly affected by temperature. Its performance is typically measured by the "power temperature coefficient," which is the percentage decrease in output power for every 1°C increase in temperature. When the module operating temperature rises to 70°C or higher, the power degradation of Topcon modules is approximately 15%-20% less than that of PERC modules. For example, under typical operating conditions with an ambient temperature of 40°C and a module surface temperature of 75°C, Topcon modules experience nearly 3 percentage points less temperature-related power loss than PERC modules. This translates directly into higher daily energy production, significantly improving system energy output in high-temperature environments.2. Bifacial Power Gain: Maximizing Ground-Reflected LightBifacial, double-glass Topcon modules not only efficiently absorb direct and diffuse sunlight on the front side, but also absorb ground-reflected light on the back side for additional power generation. In hot regions, many PV plants are built on high-albedo surfaces such as deserts, Gobi deserts, or light-colored rooftops, where ground reflectivity can reach 25%-40%. Bifacial modules leverage this advantage, achieving a backside power gain of 5%-25%. This is particularly true around noon, when the sun's altitude is high and the module tilt is low, resulting in more reflected light on the back side and a significant power gain. Furthermore, the glass backsheet offers higher light transmittance and long-term stability than traditional polymer backsheets, ensuring continued high efficiency of the rear-side cells. In high-temperature environments, this bifacial gain further offsets some of the frontside power loss caused by high temperatures, improving overall system power generation stability.3. Double-glass construction improves heat dissipation and long-term reliabilityBifacial double-glass modules utilize a front- and back-sheet encapsulation structure with tempered glass, offering improved thermal conductivity compared to traditional backsheet modules. Glass has superior thermal conductivity compared to polymer backsheets, helping to dissipate heat within the module and lowering the cell operating temperature. Furthermore, the double-glass structure eliminates the need for an organic backsheet, preventing yellowing, cracking, or delamination from prolonged exposure to high temperatures and UV radiation, significantly improving the module's weather resistance and service life. In hot, dry, or dusty environments, double-glass modules exhibit excellent dust resistance and self-cleaning capabilities, minimizing power loss caused by dust obstruction. Stable thermal performance and mechanical strength enable Topcon double-glass modules to maintain high efficiency even in harsh climates, reducing degradation and extending the efficient power generation cycle.4. Low degradation and high first-year energy yieldTopcon technology inherently features extremely low light-induced degradation and photothermal degradation, with first-year degradation limited to less than 1%, significantly superior to the 2%-3% of PERC modules. This advantage is particularly pronounced under high-temperature and high-irradiance conditions. Traditional PERC modules tend to experience significant power drop during initial operation in hot regions, while Topcon modules maintain more stable output, ensuring high power generation from the outset and improving overall lifetime energy revenue.In summary, the double-sided double-glass topcon monocrystalline solar photovoltaic module demonstrates significant system efficiency advantages in hot regions through its lower temperature coefficient, higher bifacial power gain, superior heat dissipation, and long-term reliability. It not only effectively mitigates power losses caused by high temperatures, but also continuously improves energy output year-round through its bifaciality and low attenuation characteristics.
