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640Wp
Longi Solar LR7-72HVDF-640M
Longi Solar Review

LR7-72HVDF-640M

MonocrystallineBifacial
23.70%
Efficiency
236.9 Wp/m²
Power Density
-0.260%/°C
Temp. Coeff. Pmax chart
569W from 640W
Power after 30 years
  • Efficiency of 23.7% is 0.9pp above the N-type 600-650W median (22.8%)
  • Power density of 236.9 W/m² packs 9.2 W/m² more into the same footprint vs N-type 600-650W median (227.7 W/m²)
  • Temperature coefficient of -0.26%/°C vs median -0.29%/°C means ~1% less power loss at 65°C
  • Weight of 33.5 kg is typical for N-type 600-650W panels
  • Bifacial design (70% factor) captures reflected light - adds 4-10% yield on ground-mount or white roof
Performance Profile
Price Offers 0
Shop Country Price Price/kWp
Series Hi-MO X10 Guardian (LR7-72HVDF 640~665M) 6 variants
Efficiency Range 23.7% - 24.6%
Avg. Efficiency 24.15%
Technology N-type
Dimensions 2382 × 1134 mm
Show series description

The Longi Solar Hi-MO X10 Guardian (LR7-72HVDF 640-665M) series is engineered to maintain high performance where other modules typically lose efficiency – in dusty conditions, seasonal shading, and at risk of hotspots. The key difference is the anti-dust frame design, which minimizes dirt accumulation on the glass edges, thereby reducing performance degradation over time and decreasing the need for cleaning. In practice, this ensures more reliable operation during dry seasons, on sites near roads, industrial facilities, or in polluted areas.

The modules feature back-contact architecture, which enhances light capture on the front side of the cells and supports energy yield even under challenging exposure conditions. Additionally, the series emphasizes shade resistance – experiencing fewer losses from shading caused by chimneys, skylights, obstacles, and pollution. Another important feature is reduced localized heating, increasing long-term safety and operational predictability. This makes it an excellent choice for large-scale PV farms and commercial & industrial (C&I) rooftops, where high performance, serviceability, and lower energy costs over the lifetime are key priorities.

Panels from the same series differ mainly in power output while having identical dimensions. Learn why →
Electrical Parameters (STC)
Nominal Power (Pmax)640 Wp
Module Efficiency23.70%
Voltage at Max Power (Vmpp)44.67 V
Current at Max Power (Impp)14.33 A
Open Circuit Voltage (Voc)54.02 V
Short Circuit Current (Isc)14.98 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 Count144
BifacialYes
Bifaciality Factor70%
Dimensions & Weight
Length2382 mm
Width1134 mm
Height30 mm
Weight33.5 kg
Area2.70 m²
Power Density236.9 Wp/m²
Warranty
Product Warranty15 years
Performance Warranty30 years
End-of-Warranty Output88.8%
First Year Degradation1.00%
Annual Degradation0.35%/year
Key Specifications
23.70%
Efficiency
640 Wp
Power
-0.26%/°C
Temp Coeff
30 yrs
Warranty