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720Wp
Tongwei Review

TWMHF-66HD720X

MonocrystallineBifacial
23.20%
Efficiency
231.8 Wp/m²
Power Density
-0.240%/°C
Temp. Coeff. Pmax chart
635W from 720W
Power after 30 years
  • Efficiency of 23.2% matches the N-type 700-750W median
  • 231.8 W/m² power density - 3.2 W/m² more than N-type 700-750W median (228.6 W/m²), more power per roof area
  • At -0.24%/°C (vs median -0.29%/°C), loses ~2% less power in hot conditions
  • At 37.0 kg, weight matches the N-type 700-750W median
  • Bifacial design (85% factor) captures reflected light - adds 4-13% yield on ground-mount or white roof
Performance Profile
Price Offers 0
Shop Country Price Price/kWp
Series TWMHF (66HD715–740W) 6 variants
Efficiency Range 23.0% - 23.8%
Avg. Efficiency 23.42%
Technology N-type
Dimensions 2384 × 1303 mm
Show series description

The Tongwei TWMHF (66HD715-740W) series is designed to deliver maximum yield from every square meter – where power per module and accelerating project completion matter. The application of N-type cells in a half-cut architecture helps reduce resistive losses and better withstand partial shading, translating to a more stable performance in variable weather conditions.

Modules in this series utilize bifacial designs, enabling them to further harness reflected light from the ground – a tangible advantage on flat roofs, PV farms, and structures over light surfaces (e.g., light tiles, light screed). An additional benefit is low annual power degradation over the long term, facilitating energy production planning and improving investment bankability.

TWMHF 66HD is an excellent choice for installers and investors who wish to reduce the number of modules, simplify the logistical mounting, and maintain high string power without compromising reliability.

Panels from the same series differ mainly in power output while having identical dimensions. Learn why →
Electrical Parameters (STC)
Nominal Power (Pmax)720 Wp
Module Efficiency23.20%
Voltage at Max Power (Vmpp)41.94 V
Current at Max Power (Impp)17.17 A
Open Circuit Voltage (Voc)50.30 V
Short Circuit Current (Isc)18.08 A
Max System Voltage1500 V
Temperature Coefficients
Temp. Coeff. Pmax-0.240%/°C
Temp. Coeff. Voc-0.220%/°C
Temp. Coeff. Isc0.040%/°C
NOCT44°C
Cell Technology
Cell TypeMonocrystalline
Cell Count132
BifacialYes
Bifaciality Factor85%
Dimensions & Weight
Length2384 mm
Width1303 mm
Height33 mm
Weight37.0 kg
Area3.11 m²
Power Density231.8 Wp/m²
Warranty
Product Warranty15 years
Performance Warranty30 years
End-of-Warranty Output88.1%
First Year Degradation1.00%
Annual Degradation0.38%/year
Key Specifications
23.20%
Efficiency
720 Wp
Power
-0.24%/°C
Temp Coeff
30 yrs
Warranty