Q1. What is a solar panel’s “low-light performance”? Why is it more important than the rated power?
When people buy solar panels, the first thing they notice is the rated power. This “power” is measured under standard laboratory conditions—an irradiance of 1,000 watts per square meter, equivalent to the sunlight intensity on a clear day at 35° north latitude at noon in summer, with air quality classified as AM 1.5.
However, in reality, sunlight rarely reaches 1000 W/m² for most of the day. At dawn, just as the sun rises, and in the evening, as it sets, light intensity is very low. Winter, overcast, and rainy days also constitute low-light environments. Low-light performance refers to whether a PV module can still generate electricity effectively and efficiently under these conditions of relatively low light intensity.
No matter how high a module’s rated power is, if it “shuts down” during overcast days, early mornings, or evenings, its actual power generation will be significantly reduced. Modules with excellent low-light performance deliver stable output around the clock—these are the modules that truly help you save more on electricity bills.
Q2: Just how strong is the Jinko’s Tiger Neo 3.0’s low-light performance? Are there specific data points?
In authoritative third-party field tests, the Tiger Neo 3.0 achieved a relative efficiency of 97% under low-light conditions, outperforming competing modules by 3.12 percentage points. Under low irradiance conditions of 200 W/m², the Tiger Neo 3.0 maintains a stable low-irradiance performance of 96%–97%, while competing BC modules typically range between 93% and 95%. This means the Tiger Neo 3.0 can capture more energy under low-light conditions, directly translating into additional power generation for the plant on cloudy and rainy days, as well as during peak-value time slots.
To illustrate with specific field data: In field tests conducted by TÜV Nord in Kagoshima, Japan, JinkoSolar’s TOPCon modules achieved a 29-day power generation of 119.61 kWh/kW, while N-type BC modules recorded 110.47 kWh/kW, resulting in an average long-term power generation gain of 8.27% per watt for TOPCon; Under low-irradiance conditions of less than 400 W/m², the per-watt gain was as high as 10.79%. These figures fully demonstrate the Tiger Neo 3.0’s exceptional performance in low-light environments.
Q3: Why does the Tiger Neo 3.0 maintain such high efficiency in low-light conditions? What is the underlying technical principle?
There are two core principles behind the Tiger Neo 3.0 excellent low-light performance: first, extremely low leakage current loss. And secondly, highly efficient response to the characteristic spectrum of low-light conditions (red light).
First, lower leakage current loss. The Tiger Neo 3.0 uses TOPCon cells, where the positive and negative electrodes are located on the front and back of the cell, respectively. This naturally achieves good isolation between the P-region and N-region, effectively blocking leakage current and resulting in a higher series resistance (Rsh). In contrast, the BC structure concentrates both the P-region and N-region on the rear side, where they intersect. Achieving high-quality isolation between them is technically challenging, resulting in multiple leakage pathways and a lower Rsh. While the impact of leakage current is negligible under strong light, it significantly increases under low-light conditions, severely affecting power output.
Secondly, superior red light response. During dawn, dusk, and on cloudy days, sunlight travels a longer path through the atmosphere at an oblique angle. Due to the Rayleigh scattering effect, the proportion of longer-wavelength red light increases significantly. The Tiger Neo 3.0’s TOPCon cell employs a localized N-poly structure on the back surface, where the heavily doped polycrystalline silicon region accounts for less than 30%. This results in a low photogenerated carrier recombination rate and minimal parasitic absorption, leading to higher red light response efficiency. In contrast, the heavily doped area on the back of BC cells is twice that of TOPCon cells, resulting in a significant waste of red light energy. As clearly shown by the external quantum efficiency (EQE) curves, TOPCon cells exhibit significantly higher responsivity in the infrared spectral range than BC cells—a distinct structural advantage inherent to their design.
Q4: What is “leakage current”? Why is the impact of leakage current magnified under low-light conditions?
Leakage current refers to the phenomenon where current that should flow to the external circuit “quietly leaks” internally due to imperfections in the PN junction, material impurities, or structural defects within the photovoltaic cell. In the equivalent circuit of the cell, this manifests as a shunt effect caused by the parallel resistance Rsh.
Under strong light conditions (e.g., 1000 W/m² at noon), the photogenerated current is very high. Even if some leakage current exists, its proportion is very small, and its impact on output power is negligible. However, under low-light conditions (e.g., 200 W/m² in the morning), the photogenerated current decreases significantly, while the magnitude of the leakage current decreases only slightly (determined by the cell’s intrinsic characteristics). Consequently, the proportion of leakage current in the total current increases significantly, and its negative impact on output power becomes pronounced.
To use an analogy: it is like a water pipe with a few small pinholes. When water pressure is high (at noon), a large volume of water is sprayed out, and the small amount leaking from the pinholes is barely noticeable; but when water pressure is low (in the morning or evening) and the flow becomes a trickle, the proportion of water leaking from the pinholes becomes very large. The Tiger Neo 3.0’s TOPCon structure features a mature process and excellent interface quality, with extremely few leakage pathways (equivalent to virtually no pinholes), allowing it to collect the vast majority of the current even under low-light conditions.
Q5: What is the core technology behind the Tiger Neo 3.0’s exceptional low-light performance?
The Tiger Neo 3.0’s low-light advantages stem from two core technologies:
First, high-quality leakage current control. TOPCon cells inherently benefit from a bifacial structure, with the P-region and N-region located on opposite sides of the silicon wafer, effectively isolating the two regions. Building on this, the tunneling oxide passivation technology provides exceptional chemical passivation, significantly reducing interface defects and ensuring high-quality PN junctions. At the same time, sophisticated edge preparation processes deliver excellent edge insulation and passivation. Together, these three elements form the core foundation of “low leakage current,” ensuring stable output under low-light conditions.
Secondly, the localized N-poly structure. The back side of TOPCon cells employs a localized N-poly structure, where the heavily doped polycrystalline silicon area accounts for less than 30%. This results in fewer defects and a lower recombination rate, leading to higher response efficiency to red light. In contrast, the heavily doped area on the back side of BC cells is twice that of TOPCon cells, causing photo-generated carriers to be depleted before they can convert into current.
Q6: How does the solar spectrum change in low-light conditions? Why does the proportion of red light increase?
This is determined by the Rayleigh scattering effect in atmospheric optics. As sunlight passes through the atmosphere to reach the Earth’s surface, it scatters off molecules in the air (such as nitrogen and oxygen). The intensity of scattering is inversely proportional to the fourth power of the wavelength—shorter-wavelength light (such as blue and violet light) is scattered more intensely, while longer-wavelength light (such as red light) is scattered less and has greater penetrating power.
At noon, when the sun is directly overhead, the path of sunlight through the atmosphere is shortest, and the attenuation of light across all wavelength bands is relatively uniform. However, in the early morning and evening, the sun is close to the horizon, and the path of sunlight as it travels obliquely through the atmosphere becomes significantly longer (up to more than 10 times that of midday). Short-wavelength blue and green light is heavily scattered in the atmosphere (which is why we see the sky as blue and why the sun appears red at sunrise and sunset), while long-wavelength red light penetrates the atmosphere more easily to reach the ground. Consequently, under low-light conditions (especially in the early morning and evening), the proportion of red light in the ground-level solar spectrum is significantly higher than in the standard spectrum.
The Tiger Neo 3.0 capitalizes on this physical principle by optimizing its cell structure to enhance red-light responsiveness, thereby achieving highly efficient power generation that “works with the natural conditions” in low-light environments.
Q7: In which scenarios is the Tiger Neo 3.0 best suited? Specifically, in which types of projects does its low-light performance advantage yield the greatest benefits?
The Tiger Neo 3.0’s low-light performance advantage is particularly pronounced in the following scenarios, where it is recommended as the top choice:
First, high-latitude regions. Examples include Northern Europe, Northeast China, and Northern Canada, where winter daylight hours are short, the sun’s altitude angle is low, and the proportion of low-light periods is extremely high. The Tiger Neo 3.0 can maximize power generation within these limited daylight windows.
Second, cloudy and rainy regions. This includes areas with a high average number of cloudy days per year, such as the Sichuan Basin, the Yunnan-Guizhou Plateau, the United Kingdom, and Japan. Empirical data shows that the Tiger Neo 3.0 maintains excellent power generation performance even in environments where over 90% of days are cloudy or rainy
Third, offshore solar and tidal flat power plants. These environments are often characterized by low-light conditions such as sea fog and cloud cover. The Tiger Neo 3.0’s outstanding performance during dawn and dusk effectively boosts total daily power generation.
Fourth, commercial and industrial distributed rooftop systems. When combined with time-of-use pricing mechanisms, the increased power generation during high-tariff morning and evening hours directly translates into higher returns. The Tiger Neo 3.0’s “early start, late stop” characteristics perfectly align with the peak-and-off-peak patterns of commercial and industrial electricity consumption.
Fifth, agricultural PV and mountainous power plants. In scenarios with complex lighting conditions and significant morning and evening shading, the Tiger Neo 3.0 low-light performance effectively compensates for losses caused by uneven sunlight.
Q8: How does low-light performance relate to my actual daily power generation? How much more can I earn?
Low-light performance directly determines the total effective generation time of the power plant throughout the day and the stability of power generation on cloudy and rainy days. According to field data from the China Photovoltaic Quality Testing Center (CPVT) in Yinchuan, Ningxia, power generation during low-irradiance periods (below 400 W/m²) accounts for 24% of the total monthly output—meaning that low-light periods contribute nearly a quarter of the total electricity, and the quality of low-light performance directly impacts a quarter of the revenue.
In terms of revenue: Taking a 10 MW distributed project in Shandong as an example, Tiger Neo series modules generate 2.7% more power during morning and evening hours compared to BC modules. Combined with the local time-of-use electricity pricing structure, this can save over 200,000 yuan in electricity costs annually. Under peak-off-peak pricing mechanisms, electricity rates are typically higher during morning and evening hours. Modules with excellent low-light performance can generate more power during these high-rate periods, achieving true “peak-shaving arbitrage” and significantly boosting the power plant’s lifetime revenue.
Q9: How can I determine if the Tiger Neo 3.0’s low-light performance is suitable for my project?
You can make a quick assessment by considering the following points:
1. Consider the climate characteristics of the project location. If the area has a high average number of cloudy days per year (e.g., over 150 days/year) or frequent winter haze/rain, the Tiger Neo 3.0’s low-light advantage will be particularly pronounced.
2. Consider the electricity pricing mechanism. If your project operates under time-of-use pricing, and electricity rates are higher in the morning and evening than at midday, the additional power generated by the Tiger Neo 3.0 during these periods will directly translate to higher revenue from electricity sales.
3. Consider the installation environment. If there are obstructions near the power plant (such as shadows from mountains or buildings), or if the module installation angle is relatively low, the ability to utilize diffuse light during low-light conditions in the morning and evening becomes particularly important, making the Tiger Neo 3.0 an ideal choice.
4. Focus on full lifecycle returns. We recommend using professional simulation software (such as PVsyst) to input local, actual meteorological data and compare the annual power generation differences among various modules. Thanks to its superior low-light performance, the Tiger Neo 3.0 typically recoups the initial investment premium within 5–7 years, with the remaining 20+ years generating net returns.
Q10: As a regular user, how can I verify the low-light performance of the Tiger Neo 3.0 ? Is there a simple, intuitive way to observe this?
Users who have installed Tiger Neo 3.0 modules can experience its low-light performance firsthand using the following methods:
1. Observe the “early start, late stop” phenomenon. In the early morning shortly after sunrise, or in the evening before sunset, compared to power plants in the same region equipped with other types of modules, Tiger Neo 3.0 power plants typically begin power output earlier (the inverter starts sooner) and stop generating power later.
2. Monitor power generation on cloudy or rainy days. On cloudy or overcast days, the decline in power generation for the Tiger Neo 3.0 is less than what is typically expected. If your power plant is equipped with a power generation monitoring system, you can compare actual power generation on cloudy days with theoretical estimates to verify its low-light performance.
3. Refer to field test reports. JinkoSolar’s official website regularly publish third-party field test data. Users can review test results from their region or areas with similar climates for reference.
The low-light performance advantage of the Tiger Neo 3.0 is not merely a theoretical projection but a proven capability validated by extensive outdoor field testing—a benefit users will experience firsthand in real-world operation.