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660Wp
Longi Solar Review

LR8-66HYD-660M

MonocrystallineBifacial
Datasheet
24.40%
Efficiency
244.3 Wp/m²
Power Density
-0.260%/°C
Temp. Coeff. Pmax chart
586W from 660W
Power after 30 years
Smart Insights (data-driven)
  • Efficiency of 24.4% matches the Back Contact 650-700W median
  • Power density of 244.3 W/m² matches the Back Contact 650-700W median
  • At -0.26%/°C, hot weather performance is typical for Back Contact 650-700W panels
  • 70% bifaciality enables rear-side power generation, boosting yield by 4-10% on reflective surfaces
  • Ranked #71 out of 11672 panels for efficiency in the database
Performance Profile
Price Offers 0
Shop Country Price Price/kWp
Series Hi-MO 9 10 variants
Efficiency Range 23.1% - 24.8%
Avg. Efficiency 23.96%
Technology Back Contact
Dimensions 2382 × 1134 mm
Show series description

Longi Solar Hi-MO 9 is a breakthrough series of modules that redefines performance standards through the use of advanced HPBC 2.0 cell technology. This solution eliminates losses resulting from shading the front part of the cell by busbars, which directly translates into record efficiency and modern aesthetics. These panels are the ideal choice for investors seeking maximum energy yield from limited roof area, effectively solving the problem of space shortages in ambitious projects. Thanks to its optimized internal structure, Hi-MO 9 demonstrates exceptional resistance to degradation and stable operation even in low-light conditions, guaranteeing real gains on cloudy days. The innovative design also ensures an excellent temperature coefficient, limiting power drops during summer heat. This series is dedicated to both demanding households and large-scale solar farms, where the lowest levelized cost of energy is key. Compared to the competition, Hi-MO 9 stands out with a unique hybrid structure that combines the highest efficiency with long-term mechanical reliability. It is a safe and future-proof choice for anyone focusing on the highest quality of workmanship and the most modern technological thought in the photovoltaic industry.

Panels from the same series differ mainly in power output while having identical dimensions. Learn why →
Electrical Parameters (STC)
Nominal Power (Pmax)660 Wp
Module Efficiency24.40%
Voltage at Max Power (Vmpp)41.40 V
Current at Max Power (Impp)15.95 A
Open Circuit Voltage (Voc)50.21 V
Short Circuit Current (Isc)16.65 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 Factor70%
Dimensions & Weight
Length2382 mm
Width1134 mm
Height30 mm
Weight33.5 kg
Area2.70 m²
Power Density244.3 Wp/m²
Warranty
Product Warranty12 years
Performance Warranty30 years
End-of-Warranty Output88.8%
First Year Degradation1.00%
Annual Degradation0.35%/year
Key Specifications
24.40%
Efficiency
660 Wp
Power
-0.26%/°C
Temp Coeff
30 yrs
Warranty
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