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Tongwei Brand review

TWMHF-66HD720X

720 Wp N-type Bifacial 85%
ComparePV verdict

Strong in heat, no clear weak spot

Rank 334 of 14,129
Compare panels Datasheet PDF
Power (Wp)
720
Strong · top 23%
Efficiency (%)
23.20
Strong · top 18%
Density (Wp/m²)
231.8
Strong · top 23%
Temp (%/°C)
-0.240
Strong · top 3%
Weight (kg)
37.0
Strong · top 20%
Warranty (yrs)
30
Typical · median 30 yrs

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.

Ranking

93 panels in the segment N-type 700-750 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.20% 22.90% Strong · top 18% 1,349
Power density 231.8 228.6 Strong · top 23% 1,390
Temperature coefficient -0.240 -0.290 Strong · top 3% 13
Weight per kWp 51.4 53.4 Strong · top 20% 4,801
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

3 positive · 0 caution
Best for

Commercial, utility-scale and shaded-installations.

Strengths
-0.240 %/°C temperature coefficient

Top 3% of the N-type 700-750 W segment, against a median of -0.290. Ranked 13th in the whole database.

23.20% module efficiency

Top 18% of the N-type 700-750 W segment, against a median of 22.90%.

51.4 kg per kWp

Top 20% of the N-type 700-750 W segment, against a median of 53.4.

Notes from the database
  • 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
  • 85% bifaciality enables rear-side power generation, boosting yield by 4-13% on reflective surfaces
  • In the top 10% for efficiency among all N-type panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 720 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.20 % Strong Segment median 22.90%
Vmpp · Impp 41.94 V · 17.17 A Operating point at max power
Voc · Isc 50.30 V · 18.08 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2384×1303×33 mm · 3.11 m² of roof
Weight 37.0 kg Strong Strong · top 20%
Cells 132 · N-type Monocrystalline
Bifaciality 85 % Rear output as a share of front
Coefficient Pmax -0.240 %/°C Strong top 3% of its segment
Coefficient Voc · Isc -0.220 · 0.040 %/°C
NOCT 44 °C At 800 W/m², 20 °C ambient
Product warranty 15 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 88.1 % Equals 635 W guaranteed
Degradation 1.00 → 0.38 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by Tongwei in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 720 Wp appear here. The rest cover the whole series.

Linear Power Output Warranty Linear Power Output Warranty Whole series I-V Curve (Current vs Voltage, Cell temperature 25°C) I-V Curve (Current vs Voltage, Cell temperature 25°C) Whole series

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-
With bifacial gain
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.240 %/°C against a segment median of -0.290
-
Bifacial gain
Rear gain over light concrete: -
-

Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.

Filter these
Size
Panel Power Eff. Temp. Weight Difference
Tongwei TWMHF-66HD720X 720 W 23.20% -0.240 37.0 kg You are here
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg -40 W, lighter, +2.0 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg -45 W, lighter, +1.8 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg Hotter, lighter, +1.8 pp
WST-675BKX72-A2 675 W 25.00% -0.260 32.1 kg -45 W, lighter, +1.8 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg -25 W, lighter, +1.7 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg -50 W, lighter, +1.6 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg -50 W, lighter, +1.6 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg -50 W, lighter, +1.6 pp
TWMPF-66HD655 655 W 21.10% -0.330 37.9 kg -65 W, hotter, -2.1 pp
TWMPF-66HD660 660 W 21.20% -0.330 37.9 kg -60 W, hotter, -2.0 pp
TWMPF-66HD665 665 W 21.40% -0.330 37.9 kg -55 W, hotter, -1.8 pp
TWMPF-66HD670 670 W 21.60% -0.330 37.9 kg -50 W, hotter, -1.6 pp
TWMPF-66HD675 675 W 21.70% -0.330 37.9 kg -45 W, hotter, -1.5 pp
TWMNF-66HD700XX 700 W 22.50% -0.280 37.9 kg -20 W, hotter, -0.7 pp
TWMNF-66HD705 705 W 22.70% -0.280 37.9 kg -15 W, hotter, -0.5 pp
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +85 W, heavier, +1.9 pp

Found 1393 panels of the same or similar size to this one, within ±10 mm. See them here Found 1403 panels of the same or similar size to this one, within ±25 mm. See them here Found 1403 panels of the same or similar size to this one, within ±50 mm. See them here Found 1435 panels of the same or similar size to this one, within ±100 mm. See them here

About the TWMHF (66HD715–740W) series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this module's own.

What is the maximum efficiency of Tongwei TWMHF 66HD modules and how does it translate to up to 740W output?
TWMHF 66HD modules reach efficiency up to 23.00% thanks to N-type TOPCon cells arranged in a half-cut architecture (132 cells in a 6x22 layout). With dimensions of roughly 2384x1303 mm, this allows a single module to deliver up to 740 Wp, meaning fewer modules are needed to reach a target system power and lower mounting structure and installation labor costs.
How much more energy does a bifacial TWMHF panel produce compared to a standard monofacial module?
Thanks to its bifacial design, the module also generates current from its rear side, capturing light reflected off the ground. Depending on surface albedo (light gravel, white roofing membrane, snow), the real-world energy gain can range from a few to over ten percent compared to a comparable monofacial module - bifaciality of N-type cells is typically higher than that of standard P-type cells.
What warranty comes with Tongwei TWMHF 66HD solar panels?
Tongwei, a Tier 1 manufacturer, provides a 15-year product warranty and a 30-year linear power output warranty on this module. This level of coverage and the manufacturer's reputation make it easier to secure project financing (bankability) and to plan long-term energy production from the system throughout its operating life.
Are TWMHF 66HD panels suitable for large solar farms, or better suited to rooftop installations?
Given the high power output of a single module (up to 740 Wp), a weight of about 38 kg, and dimensions of roughly 2384x1303 mm, the TWMHF 66HD series is primarily designed for large ground-mounted, utility-scale PV plants, where minimizing module count and optimizing string configuration matter most. It also works on large flat roofs, provided the mounting structure and installation logistics are properly planned.
How do TWMHF panels perform in high temperatures and under partial shading?
The module has a power temperature coefficient of -0.30%/°C, meaning a smaller power drop as operating temperature rises compared to typical P-type cells, resulting in higher energy yield in summer. The half-cut architecture further splits cells into smaller segments, reducing the impact of partial shading, such as from chimneys or trees, on overall module output.
Is Tongwei a manufacturer that can be trusted for a large-scale PV investment?
Tongwei is a Chinese, Tier 1-rated manufacturer and one of the world's largest suppliers of solar cells and modules, which translates into supply chain stability and reliable access to warranty service. Tier 1 status is also frequently required by banks and insurers when financing PV projects, making it easier to secure a loan for an installation using TWMHF modules.
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