Views: 5000 Author: Nicole Publish Time: 10-21-2024 Origin: Site
66-Cell Solar Panels:
Known for lower voltage and higher current, making them more compatible with a wider range of inverters.
Ideal for residential and off-grid installations due to their flexibility in design.
Typically more resilient to partial shading, which helps maintain efficiency on rooftops with multiple orientations.
72-Cell Solar Panels:
Provide higher voltage, which allows for longer strings in large installations.
Commonly used in utility-scale or commercial projects where maximizing system voltage is essential.
With more cells, these panels are more prone to hot-spot effects under partial shading, requiring careful placement.
Below is a direct comparison between LONGi's 66-cell LR8-66HGD-605M and 72-cell LR7-72HGD-605M to demonstrate their practical differences.
Mechanical Parameters | 66-cell LR8-66HGD-605M | 72-cell LR7-72HGD-605M |
Cell Orientation | 132 (6*22), 182*210mm | 144 (6*24), 182*199mm |
Junction Box | IP68, three diodes | |
Glass | Dual glass, 2.0+2.0mm heat strengthened glass | |
Weight | 33.5kg | |
Dimension | 2382*1134*30mm | |
Packaging | 36pcs per pallet, 720pcs per 40’HC |
Key Takeaway:
While both panels share the same size, weight, and packaging, the 72-cell panel (LR7-72HGD-605M) uses more cells, potentially increasing production costs and internal resistance, which can influence efficiency.
Electrical Characteristics | 66-cell LR8-66HGD-605M | 72-cell LR7-72HGD-605M |
Testing Condition | STC : AM1.5 1000W/m2, 25℃ | |
Maximum Power (Pmax/W) | 605W | |
Open Circuit Voltage (Voc/V) | 48.18V | 52.44V |
Short Circuit Current (Isc/A) | 15.90A | 14.61A |
Voltage at Maximum Power (Vmp/V) | 40.31V | 44.00V |
Current at Maximum Power (Imp/A) | 15.01A | 13.75A |
Module Efficiency(%) | 22.40% |
Voltage vs. Current Trade-Off:
66-Cell LR8-66HGD-605M
provides higher current, which helps reduce energy losses and improve system performance under low-light conditions.
72-Cell LR7-72HGD-605M
offers higher voltage, making it more suitable for high-voltage grid-tied systems where longer strings are required.
Operating Parameters | 66-cell LR8-66HGD-605M | 72-cell LR7-72HGD-605M |
Operational Temperature | -40℃ ~ +85℃ | |
Power Output Tolerance | 0 ~ 3% | |
Maximum System Voltage | 35A | 30A |
Nominal Operating Cell Temperature | 45±2℃ | |
Protection Class | Class II | |
Bifaciality | 80±5% | |
Hailstone Test | 25mm Hailstone at the speed of 23m/s | |
Temperature Coefficient of Pmax | -0.280%/℃ |
LR8-66HGD-605M (66-Cell Panel)
Residential and Off-Grid Systems: Its lower voltage and higher current make it easier to pair with a variety of inverters and MPPT controllers.
Partial Shading Tolerance: With fewer cells, it offers better resistance to shading effects, making it suitable for rooftops with multiple orientations.
Low-Light Performance: Higher current helps maintain energy output under cloudy or low-irradiance conditions, which is important for residential systems.
LR7-72HGD-605M (72-Cell Panel)
Grid-Connected Installations: Ideal for utility-scale projects and large commercial systems due to its higher voltage, which allows for longer strings and fewer inverters.
Cost-Effective for Large Installations: Reduces the number of strings required, simplifying the overall system design.
Placement Considerations: Requires careful planning to avoid shading, as its increased cell count makes it more susceptible to hot-spot effects.
66-Cell Panels (LR8-66HGD-605M):
More resistant to partial shading, making them a reliable choice for residential rooftops where shading from trees or nearby buildings is common.
72-Cell Panels (LR7-72HGD-605M):
Prone to hot-spot effects due to the higher cell count, which could impact system performance if not carefully installed in open, unshaded areas.
66-Cell Solar Panels (e.g., LR8-66HGD-605M)
Best For: Residential, off-grid, and rooftop systems.
Why: Its higher current, better shading tolerance, and flexibility in system design make it ideal for environments with variable irradiance or complex roof layouts.
72-Cell Solar Panels (e.g., LR7-72HGD-605M)
Best For: Utility-scale, grid-connected, and commercial projects.
Why: The higher voltage supports longer strings, reducing the number of components required in large installations.
Both 66-cell and 72-cell PV Modules serve distinct purposes.
For trade partners targeting diverse markets, offering both models ensures a comprehensive product portfolio that meets varying customer needs.
Use 66-cell panels for flexible, small-scale installations, and opt for 72-cell panels for large, high-voltage systems that prioritize efficiency at scale.