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Tongwei Brand review

TWMNF-66HD700XX

700 Wp N-type Bifacial 80%
ComparePV verdict

Strong in heat, modest efficiency

Rank 1,213 of 14,005
Compare panels Datasheet PDF
Power (Wp)
700
Weak · bottom 10%
Efficiency (%)
22.50
Weak · bottom 3%
Density (Wp/m²)
225.3
Weak · bottom 10%
Temp (%/°C)
-0.280
Strong · top 19%
Weight (kg)
37.9
Typical · median 38.0 kg
Warranty (yrs)
30
Typical · median 30 yrs

Tongwei TWMNF N-type Half-Cell Bifacial Module (66) 66HD700-720W was designed for installations where maximum yield from every square meter counts - without compromising on reliability. The application of N-type technology in a half-cell configuration improves performance under partial shading and minimizes losses in daily, variable sunlight conditions. The bifacial glass-glass construction additionally utilizes reflected light from the ground, effectively boosting energy production on PV farms, carports, and large roofs with light membranes.

A key feature is the focus on stable parameters over time - the series offers ultra-low degradation and a 30-year linear power output warranty, facilitating financial planning and reducing the energy cost over the entire lifetime. This is further supported by solutions limiting the risk of micro-cracks and high mechanical strength, crucial in windy and snowy conditions. It is the choice for C&I and utility investors seeking more energy from the same surface area and a more certain return on investment.

Ranking

90 panels in the segment N-type 700-750 W
Metric This panel Median Position in segment Overall rank
Module efficiency 22.50% 22.88% Weak · bottom 3% 4,222
Power density 225.3 228.6 Weak · bottom 10% 3,989
Temperature coefficient -0.280 -0.290 Strong · top 19% 1,309
Weight per kWp 54.1 53.5 Typical 8,357
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

1 positive · 2 caution
Best for

Utility-scale, commercial and shaded-installations.

Not ideal for

Tight roof space and roofs where every square metre has to count.

Strengths
-0.280 %/°C temperature coefficient

Top 19% of the N-type 700-750 W segment, against a median of -0.290.

Watch-outs
22.50% module efficiency

Bottom 3% of the N-type 700-750 W segment, against a median of 22.88%. Ranked 4,222nd in the whole database.

225.3 watts per square metre

Bottom 10% of the N-type 700-750 W segment, against a median of 228.6. Ranked 3,989th in the whole database.

Notes from the database
  • At 22.5% efficiency, this panel is on par with typical N-type 700-750W modules
  • Power density of 225.3 W/m² is 3.3 W/m² below N-type 700-750W median (228.6 W/m²) - needs more roof space
  • At -0.28%/°C, hot weather performance is typical for N-type 700-750W panels
  • Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof
  • Ranked #4222 out of 14005 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 700 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.50 % Weak Segment median 22.88%
Vmpp · Impp 40.35 V · 17.59 A Operating point at max power
Voc · Isc 48.66 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 · N-type Monocrystalline
Bifaciality 80 % Rear output as a share of front
Coefficient Pmax -0.280 %/°C Strong top 19% 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 612 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 700 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-66HD700XX 700 W 22.50% -0.280 37.9 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg -50 W, lighter, +2.7 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg Cooler, lighter, +2.7 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg -25 W, lighter, +2.5 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg Cooler, lighter, +2.5 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg Cooler, lighter, +2.4 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg -30 W, lighter, +2.3 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg -30 W, lighter, +2.3 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg -30 W, lighter, +2.3 pp
TWMPF-66HD655 655 W 21.10% -0.330 37.9 kg -45 W, hotter, -1.4 pp
TWMPF-66HD660 660 W 21.20% -0.330 37.9 kg -40 W, hotter, -1.3 pp
TWMPF-66HD665 665 W 21.40% -0.330 37.9 kg -35 W, hotter, -1.1 pp
TWMPF-66HD670 670 W 21.60% -0.330 37.9 kg -30 W, hotter, -0.9 pp
TWMPF-66HD675 675 W 21.70% -0.330 37.9 kg -25 W, hotter, -0.8 pp
TWMNF-66HD705 705 W 22.70% -0.280 37.9 kg Very close match
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +105 W, cooler, +2.6 pp
AIKO-A800-GRH78Dw 800 W 24.90% -0.260 39.8 kg +100 W, cooler, +2.4 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
Is the Tongwei TWMNF 66HD700-720W series still available for purchase?
The Tongwei TWMNF N-type Half-cell Bifacial Module(66) 66HD700-720W has been discontinued and replaced by newer manufacturer series. Units may still be available from distributors with remaining stock, but we recommend contacting your supplier to confirm current availability and warranty terms for purchased units.
What does N-type technology mean in Tongwei TWMNF panels and how does it differ from P-type?
N-type cells used in the TWMNF series show lower degradation over time and better tolerance to metal impurities in silicon than traditional P-type cells. In practice this means higher initial efficiency, a smaller first-year power drop, and more stable energy output throughout the 30-year linear power warranty period.
Are Tongwei TWMNF 66HD panels bifacial, and how much extra energy does that provide?
Yes, the TWMNF 66HD series uses a glass-glass bifacial construction, generating power from both sides of the module. The rear side captures light reflected from the ground, roof, or surroundings, which - depending on surface albedo and mounting height - can increase total energy yield by several to over a dozen percent compared to monofacial panels.
What warranty applies to the Tongwei TWMNF 66HD700-720W panels?
The manufacturer covers the TWMNF 66HD700-720W series with a 12-year product warranty and a 30-year linear power output warranty. This warranty structure guarantees a predictable power degradation curve over time, helping investors accurately model ROI and levelized cost of energy (LCOE) across the entire lifecycle of the installation.
Are Tongwei TWMNF 66HD700-720W panels suitable for solar farms and carports?
With power output up to 720 Wp and a glass-glass bifacial construction, these panels are primarily suited for large-scale C&I and utility installations - solar farms, carports, and large flat roofs with a light-colored membrane that boost rear-side light reflection. The high per-unit power reduces the number of modules needed to reach a target installation capacity.
Can Tongwei TWMNF panels withstand heavy snow and wind loads?
The TWMNF series is engineered for high mechanical load resistance, reducing the risk of cell microcracks under heavy snow and strong wind. The rigid glass-glass construction further increases module stiffness and durability in demanding climates, which is important when designing large ground-mount and rooftop installations.
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