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640Wp
Tongwei TWMNH-66HD640
Tongwei Review

TWMNH-66HD640

MonocrystallineBifacial
23.70%
Efficiency
236.9 Wp/m²
Power Density
-0.280%/°C
Temp. Coeff. Pmax chart
559W from 640W
Power after 30 years
  • 23.7% module efficiency - 0.9pp better than the N-type 600-650W median of 22.8%
  • 236.9 W/m² power density - 9.2 W/m² more than N-type 600-650W median (227.7 W/m²), more power per roof area
  • At -0.28%/°C, hot weather performance is typical for N-type 600-650W panels
  • Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface
  • Ranked #365 out of 11891 panels for efficiency in the database
Performance Profile
Price Offers 0
Shop Country Price Price/kWp
Series TWMNH-66HD 5 variants
Efficiency Range 23.5% - 24.2%
Avg. Efficiency 23.88%
Technology N-type
Dimensions 2382 × 1134 mm
Show series description

Tongwei TWMNH-66HD series are N-type half-cut modules designed for high energy yield in real-world operating conditions – including low irradiance and applications subject to periodic shading. The key advantage lies in combining technologies boosting both-sided gain with solutions enhancing long-term reliability: high bifaciality translates to additional rear-side generation, while ultra-low degradation helps maintain predictable energy production for years. This series also features 908 Technology (0BB), an interconnection architecture minimizing optical losses and improving resistance to micro-cracking, crucial during transport and operation. Furthermore, Stencil Printing and TPE support metallization precision and cell performance quality, contributing to stable parameters. The TWMNH-66HD is ideal for C&I and utility-scale PV farms, where low LCOE, reliability, and maximum yield per square meter matter.

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)41.38 V
Current at Max Power (Impp)15.47 A
Open Circuit Voltage (Voc)49.75 V
Short Circuit Current (Isc)16.33 A
Max System Voltage1500 V
Temperature Coefficients
Temp. Coeff. Pmax-0.280%/°C
Temp. Coeff. Voc-0.240%/°C
Temp. Coeff. Isc0.046%/°C
NOCT-
Cell Technology
Cell TypeMonocrystalline
Cell Count132
BifacialYes
Bifaciality Factor80%
Dimensions & Weight
Length2382 mm
Width1134 mm
Height30 mm
Weight32.2 kg
Area2.70 m²
Power Density236.9 Wp/m²
Warranty
Product Warranty12 years
Performance Warranty30 years
End-of-Warranty Output87.4%
First Year Degradation1.00%
Annual Degradation0.40%/year
Key Specifications
23.70%
Efficiency
640 Wp
Power
-0.28%/°C
Temp Coeff
30 yrs
Warranty