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What is the difference between 66-cell and 72 cell solar panels?

Views: 5000     Author: Nicole     Publish Time: 10-21-2024      Origin: Site

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1. What is 66-Cell and 72-Cell Solar Panels

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.


2. Example: LONGi Models: LR8-66HGD-605M vs. LR7-72HGD-605M

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.


3. Electrical Performance Comparison

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.


4. Operating Parameters

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%/℃


5. Application Scenarios

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.


6. Shadowing and Reliability

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.


7. Conclusion: Which Panel Should You Choose?

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.


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