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Tongwei Brand review

TWMNF-66HDH70X

720 Wp TOPCon Bifacial 80%
ComparePV verdict

Strong in heat, no clear weak spot

Rank 524 of 14,129
Compare panels Datasheet PDF
Power (Wp)
720
Typical for its class
Efficiency (%)
23.20
Strong · top 25%
Density (Wp/m²)
231.8
Typical · median 230.2
Temp (%/°C)
-0.280
Strong · top 11%
Weight (kg)
37.9
Typical · median 38.0 kg
Warranty (yrs)
30
Typical · median 30 yrs

The Tongwei TWMNF 66HD700-720W series is designed for installations where maximizing yield from the same surface area and long-term reliability are key priorities. These are bifacial modules in a dual glass construction, capable of truly utilizing reflected light from the ground surface - making them ideal for flat rooftops, ballasted systems, and ground-mounted or rooftop solar farms with light-colored ground cover or membrane roofs.

They stand out in the competitive market due to the combination of N-type TOPCon cells with technologies enhancing current flow and micro-crack resistance. The result is more stable performance over time, reduced risk of power losses, and higher energy production in less-than-ideal conditions - such as diffuse light, higher temperatures, or periodic soiling.

This is an excellent choice for C&I and utility-scale investors seeking to lower the energy cost-of-ownership throughout the installation's lifecycle and prioritizing ultra-low degradation and a 30-year linear power warranty.

Ranking

420 panels in the segment TOPCon 700-750 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.20% 23.00% Strong · top 25% 1,349
Power density 231.8 230.2 Typical 1,390
Temperature coefficient -0.280 -0.290 Strong · top 11% 1,347
Weight per kWp 52.6 52.9 Typical 6,317
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

2 positive · 0 caution
Best for

Commercial, utility-scale and hot-climate.

Strengths
-0.280 %/°C temperature coefficient

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

23.20% module efficiency

Top 25% of the TOPCon 700-750 W segment, against a median of 23.00%.

Notes from the database
  • At 23.2% efficiency, this panel is on par with typical TOPCon 700-750W modules
  • At 231.8 W/m² power density, roof space requirements are typical for TOPCon 700-750W panels
  • 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
  • #1349 for efficiency, #1347 for temperature performance out of 14129 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 720 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.20 % Strong Segment median 23.00%
Vmpp · Impp 41.03 V · 17.55 A Operating point at max power
Voc · Isc 49.28 V · 18.55 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 37.9 kg Typical Typical · median 38.0 kg
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
NOCT 45 °C At 800 W/m², 20 °C ambient
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 629 W guaranteed
Degradation 1.00 % First year

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 (Cell temperature 25°C) I-V Curve (Cell temperature 25°C) Whole series P-V Curve (Power vs Voltage at varying irradiance) P-V Curve (Power vs Voltage at varying irradiance) 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-66HDH70X 720 W 23.20% -0.280 37.9 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 Cooler, 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, -0.7 pp
TWMNF-66HD705 705 W 22.70% -0.280 37.9 kg -15 W, -0.5 pp
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +85 W, cooler, +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 TWMNF 66HD700–720W series

6 answered

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

What is N-type TOPCon technology in Tongwei TWMNF 66HD700-720W panels and what are its advantages?
N-type TOPCon cells use a passivated rear contact that reduces recombination losses, delivering higher efficiency (22.5-23.5%) and lower LID/LeTID degradation than standard PERC cells. Combined with a multi-busbar design, they also offer better resistance to microcracks. In the TWMNF 66HD700-720W series this translates into up to 720 Wp from a single 132-cell module and more stable long-term output.
What does the bifacial dual glass design mean and which installations suit the TWMNF 66HD700-720W series?
The dual glass bifacial design lets the rear side of the module capture light reflected off the ground, boosting energy yield. It performs especially well on flat roofs with light-colored membranes, ballasted mounting systems, and utility-scale PV farms with bright ground cover, where the bifacial gain can add several to over ten percent compared to a monofacial module.
What warranty covers the Tongwei TWMNF 66HD700-720W series?
The manufacturer provides a 12-year product warranty and a 30-year linear power warranty, standard for a premium tier-1 offering. Thanks to ultra-low annual degradation, the module retains a high share of its nominal power even near the end of its service life, lowering the levelized cost of energy (LCOE) over the system's lifetime.
Do TWMNF 66HD700-720W panels perform well in high-temperature conditions?
Yes. TOPCon cells have a favorable temperature coefficient of power (around -0.28%/°C), better than typical PERC cells. This means a smaller power loss as the module heats up, which matters on flat roofs or in utility-scale installations in warmer climates, where panels run hotter than tilted, well-ventilated rooftop arrays.
Is the Tongwei TWMNF 66HD700-720W series still available for purchase?
No, this series has been discontinued and replaced by the manufacturer's newer models. Availability is now limited to remaining distributor stock. This matters for larger C&I or utility-scale projects that need module batch consistency - sourcing additional panels from this exact series later may prove difficult.
How much does the TWMNF 66HD700-720W module weigh and does it need special mounting hardware?
The module measures roughly 2384x1303x33 mm and weighs nearly 38 kg, heavier than typical modules due to its dual glass construction (glass on both sides instead of a rear backsheet). Before installation, check the load capacity of the roof structure or ballast system - standard design practice for utility-scale and C&I projects.
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