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665Wp
Longi Solar LR8-66HVD-665M
Longi Solar Review

LR8-66HVD-665M

MonocrystallineBifacial
Datasheet
24.62%
Efficiency
246.2 Wp/m²
Power Density
-0.260%/°C
Temp. Coeff. Pmax chart
591W from 665W
Power after 30 years
Smart Insights (data-driven)
  • Efficiency of 24.6% matches the Back Contact 650-700W median
  • At 246.2 W/m² power density, roof space requirements are typical for Back Contact 650-700W panels
  • At -0.26%/°C, hot weather performance is typical for Back Contact 650-700W panels
  • Bifacial design (75% factor) captures reflected light - adds 4-11% yield on ground-mount or white roof
  • Ranked #31 out of 11672 panels for efficiency in the database
Performance Profile
Price Offers 0
Shop Country Price Price/kWp
Series Hi-MO X10 Scientist / LR8-66HVD 640~665M 6 variants
Efficiency Range 23.7% - 24.6%
Avg. Efficiency 24.16%
Technology Back Contact
Dimensions 2382 × 1134 mm
Show series description

This Longi Solar Hi-MO X10 Scientist LR8-66HVD 640-665M series is designed for investors seeking maximum energy production from limited roof space and reliable performance in real-world conditions. The application of N-TaiRay cells and HPBC 2.0 architecture enables better light utilization and minimizes typical losses associated with conventional modules featuring visible front grids. The result is not only high efficiency but also more predictable energy generation under variable sunlight conditions.

A practical advantage of this series is A+ Anti-Shading – a solution that supports energy gains when the module is partially shaded by a chimney, tree, or structural elements. Furthermore, the construction is engineered for safety by reducing the risk of hotspots and offering lower susceptibility to micro-cracks.

This is an excellent choice for modern residential installations and premium projects where yield, aesthetics (lack of visible front gridlines), and durability are prioritized over the compromises typical of less expensive solutions.

Panels from the same series differ mainly in power output while having identical dimensions. Learn why →
Electrical Parameters (STC)
Nominal Power (Pmax)665 Wp
Module Efficiency24.62%
Voltage at Max Power (Vmpp)41.28 V
Current at Max Power (Impp)16.11 A
Open Circuit Voltage (Voc)50.02 V
Short Circuit Current (Isc)16.78 A
Max System Voltage1500 V
Temperature Coefficients
Temp. Coeff. Pmax-0.260%/°C
Temp. Coeff. Voc-0.200%/°C
Temp. Coeff. Isc0.050%/°C
NOCT45°C
Cell Technology
Cell TypeMonocrystalline
Cell Count132
BifacialYes
Bifaciality Factor75%
Dimensions & Weight
Length2382 mm
Width1134 mm
Height30 mm
Weight33.5 kg
Area2.70 m²
Power Density246.2 Wp/m²
Warranty
Product Warranty15 years
Performance Warranty30 years
End-of-Warranty Output88.8%
First Year Degradation1.00%
Annual Degradation0.35%/year
Key Specifications
24.62%
Efficiency
665 Wp
Power
-0.26%/°C
Temp Coeff
30 yrs
Warranty
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