Skip to main content
Tongwei TWMNF-66HD740
Tongwei Brand review

TWMNF-66HD740

740 Wp TOPCon Bifacial 80%
ComparePV verdict

Space saver, no clear weak spot

Rank 183 of 14,005
Compare panels Datasheet PDF
Power (Wp)
740
Strong · top 2%
Efficiency (%)
23.80
Strong · top 3%
Density (Wp/m²)
238.2
Strong · top 2%
Temp (%/°C)
-0.280
Strong · top 11%
Weight (kg)
37.3
Strong · top 19%
Warranty (yrs)
30
Typical · median 30 yrs

The TNC 2.0 TWMNF-66HD series from Tongwei is a next-generation line of photovoltaic modules built around N-type TOPCon cells, combining strong operational stability with limited long-term power degradation. The use of half-cut cell technology along with a dense busbar layout helps reduce resistive losses and improve heat dissipation, resulting in more stable energy output even under partial shading conditions. The bifacial design allows the module to capture additional energy from its rear side, making it especially valuable for installations on reflective ground surfaces or in ground-mounted and tracker-based systems. The TWMNF-66HD series is engineered for large commercial and industrial installations, where what matters is not only unit performance but also a low levelized cost of energy (LCOE) and straightforward integration with BoS components. Thanks to a reinforced frame and robust mechanical construction, the modules perform well under demanding climate conditions, including high snow and wind loads. This is a solution for investors and installers looking for efficient, predictable module performance over the long term, while staying competitively priced within the N-type module segment.

Ranking

420 panels in the segment TOPCon 700-750 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.80% 23.00% Strong · top 3% 433
Power density 238.2 230.2 Strong · top 2% 431
Temperature coefficient -0.280 -0.290 Strong · top 11% 1,309
Weight per kWp 50.4 52.9 Strong · top 19% 3,784
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

Utility-scale, commercial and shaded-installations.

Strengths
238.2 watts per square metre

Top 2% of the TOPCon 700-750 W segment, against a median of 230.2. Ranked 431st in the whole database.

23.80% module efficiency

Top 3% of the TOPCon 700-750 W segment, against a median of 23.00%. Ranked 433rd in the whole database.

-0.280 %/°C temperature coefficient

Top 11% of the TOPCon 700-750 W segment, against a median of -0.290.

Notes from the database
  • At 23.8% efficiency, this panel is 0.8pp above typical TOPCon 700-750W modules (median: 23.0%)
  • 238.2 W/m² power density - 8.0 W/m² more than TOPCon 700-750W median (230.2 W/m²), more power per roof area
  • At -0.28%/°C, hot weather performance is typical for TOPCon 700-750W panels
  • Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface
  • In the top 3% for efficiency among all TOPCon panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 740 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.80 % Strong Segment median 23.00%
Vmpp · Impp 41.69 V · 17.75 A Operating point at max power
Voc · Isc 49.80 V · 18.81 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 37.3 kg Strong Strong · top 19%
Cells 132 · TOPCon Monocrystalline
Bifaciality 80 % Rear output as a share of front
Coefficient Pmax -0.280 %/°C Strong top 11% of its segment
Coefficient Voc · Isc -0.240 · 0.046 %/°C
Product warranty 12 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 647 W guaranteed
Degradation 1.00 → 0.40 % 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 740 Wp appear here. The rest cover the whole series.

Current-Voltage (I-V) Curves at different irradiance levels (Cell temperature 25°C) Current-Voltage (I-V) Curves at different irradiance levels (Cell temperature 25°C) Whole series Power-Voltage (P-V) Curves at different irradiance levels Power-Voltage (P-V) Curves at different irradiance levels 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
-0.280 %/°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 TWMNF-66HD740 740 W 23.80% -0.280 37.3 kg You are here
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg -40 W, lighter, +1.2 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg -45 W, lighter, +1.1 pp
AIKO-A690-MAE78Dw 690 W 24.70% -0.260 34.5 kg -50 W, lighter, +0.9 pp
AIKO-A790-GRH78Dw 790 W 24.60% -0.260 39.8 kg +50 W, heavier, +0.8 pp
TSM-NEG21C.20Q-760 760 W 24.50% -0.260 38.3 kg +20 W, cooler, +0.7 pp
AIKO-A785-GRH78Dw 785 W 24.40% -0.260 39.8 kg +45 W, heavier, +0.6 pp
GK-4-78HGBD-780M 780 W 24.30% -0.260 38.7 kg +40 W, cooler, +0.5 pp
AIKO-A780-GRH78Dw 780 W 24.30% -0.260 39.8 kg +40 W, heavier, +0.5 pp
JT755SLk(B) 755 W 24.30% -0.240 36.4 kg +15 W, cooler, +0.5 pp
TSM-NEG21C.20Q-755 755 W 24.30% -0.260 38.3 kg +15 W, cooler, +0.5 pp
TWMPF-66HD655 655 W 21.10% -0.330 37.9 kg -85 W, hotter, -2.7 pp
TWMPF-66HD660 660 W 21.20% -0.330 37.9 kg -80 W, hotter, -2.6 pp
TWMPF-66HD665 665 W 21.40% -0.330 37.9 kg -75 W, hotter, -2.4 pp
TWMPF-66HD670 670 W 21.60% -0.330 37.9 kg -70 W, hotter, -2.2 pp
TWMPF-66HD675 675 W 21.70% -0.330 37.9 kg -65 W, hotter, -2.1 pp
TWMNF-66HD700XX 700 W 22.50% -0.280 37.9 kg -40 W, -1.3 pp
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +65 W, heavier, +1.3 pp

Found 1390 panels of the same or similar size to this one, within ±10 mm. See them here Found 1400 panels of the same or similar size to this one, within ±25 mm. See them here Found 1400 panels of the same or similar size to this one, within ±50 mm. See them here Found 1432 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
How do the N-type TOPCon cells in the TNC 2.0 TWMNF-66HD series differ from older PERC cells?
N-type TOPCon cells used in the TWMNF-66HD show lower power degradation over time and better performance at high temperatures than traditional PERC cells. The panels reach an efficiency of 23.5-24.1%, with a temperature coefficient of Pmax of only -0.28%/°C, meaning smaller output losses on hot days. This translates into higher energy yield over the module's 30-year service life.
What is the maximum power output of the Tongwei TWMNF-66HD panels and how many cells do they contain?
The TNC 2.0 TWMNF-66HD series delivers up to 750 Wp, with variants ranging from 730 to 750 Wp. The module is built with 132 half-cut cells, which reduces resistive losses and improves shading tolerance compared to panels with full-size cells. High unit power lowers the number of modules needed for large commercial installations.
How much extra energy does the bifacial design of the TWMNF-66HD panels generate?
The dual-sided, bifacial construction lets the module capture additional energy reflected off the ground on its rear side. The actual gain depends on the albedo of the surface below the array, mounting height, and tilt angle, but with a bright ground surface such as gravel it can add anywhere from a few to over ten percent more annual energy compared to a monofacial module. The effect is most pronounced in ground-mount and tracker installations.
What warranty comes with the Tongwei TNC 2.0 TWMNF-66HD panels?
The manufacturer offers a 12-year product warranty along with a 30-year linear power warranty, guaranteeing 99% output after the first year and 87.4% after 30 years. This is standard for modern N-type modules and gives investors predictable long-term economics for their solar installation.
Are the TWMNF-66HD panels suitable for large commercial and industrial roofs?
Yes, the module measures 2384x1303x33 mm and weighs about 37.3 kg, which is typical for large C&I and utility-scale panels. A reinforced frame provides resistance to heavy snow and wind loads, and the high unit power of 750 Wp reduces the number of modules, cabling, and mounting hardware needed, lowering BoS costs for large rooftop and ground-mount installations.
Is Tongwei a reliable, established solar panel manufacturer?
Tongwei is a Tier 1 manufacturer based in China and one of the world's largest suppliers of solar cells and modules, present in the supply chain of many global commercial and utility-scale projects. Tier 1 status reflects financial stability and a long track record, which matters when enforcing the 30-year power warranty and securing bank financing for large PV projects.
Add to compare