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Tongwei TWMNH-66HD655
Tongwei Brand review

TWMNH-66HD655

655 Wp N-type Bifacial 80%
ComparePV verdict

Light for its output, no clear weak spot

Rank 1,006 of 14,129
Compare panels Datasheet PDF
Power (Wp)
655
Typical for its class
Efficiency (%)
24.20
Typical · median 23.31%
Density (Wp/m²)
242.5
Typical · median 233.2
Temp (%/°C)
-0.280
Typical · median -0.290
Weight (kg)
32.2
Strong · 1.3 kg below median
Warranty (yrs)
30
Typical · median 30 yrs

Tongwei TWMNH-66HD series are N-type half-cut modules designed for high energy yield in real-world operating conditions - including low irradiance and applications subject to periodic shading. The key advantage lies in combining technologies boosting both-sided gain with solutions enhancing long-term reliability: high bifaciality translates to additional rear-side generation, while ultra-low degradation helps maintain predictable energy production for years. This series also features 908 Technology (0BB), an interconnection architecture minimizing optical losses and improving resistance to micro-cracking, crucial during transport and operation. Furthermore, Stencil Printing and TPE support metallization precision and cell performance quality, contributing to stable parameters. The TWMNH-66HD is ideal for C&I and utility-scale PV farms, where low LCOE, reliability, and maximum yield per square meter matter.

Ranking

110 panels in the segment N-type 650-700 W
Metric This panel Median Position in segment Overall rank
Module efficiency 24.20% 23.31% Typical 206
Power density 242.5 233.2 Typical 192
Temperature coefficient -0.280 -0.290 Typical 1,347
Weight per kWp 49.2 51.0 Strong · top 23% 2,782
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 · 0 caution
Best for

Commercial, utility-scale and shaded-installations.

Strengths
49.2 kg per kWp

Top 23% of the N-type 650-700 W segment, against a median of 51.0.

Notes from the database
  • Efficiency of 24.2% is 0.9pp above the N-type 650-700W median (23.3%)
  • Power density of 242.5 W/m² packs 9.3 W/m² more into the same footprint vs N-type 650-700W median (233.2 W/m²)
  • At -0.28%/°C, hot weather performance is typical for N-type 650-700W panels
  • Weight of 32.2 kg (1.3 kg below N-type 650-700W median of 33.5 kg) allows easier transport and roof mounting
  • Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof

Specifications

Open datasheet PDF
Nominal power (Pmax) 655 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 24.20 % Typical Segment median 23.31%
Vmpp · Impp 41.78 V · 15.68 A Operating point at max power
Voc · Isc 50.15 V · 16.52 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2382×1134×30 mm · 2.70 m² of roof
Weight 32.2 kg Strong Strong · 1.3 kg below median
Cells 132 · N-type Monocrystalline
Bifaciality 80 % Rear output as a share of front
Coefficient Pmax -0.280 %/°C Typical median -0.290 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 572 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 655 Wp appear here. The rest cover the whole series.

Linear Power Output Warranty Linear Power Output Warranty Whole series Cell temperature 25°C 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
-0.280 %/°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 TWMNH-66HD655 655 W 24.20% -0.280 32.2 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +1.0 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +25 W, lighter, +1.0 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg Cooler, lighter, +0.8 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +0.8 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +45 W, heavier, +0.8 pp
WST-675BKX72-A2 675 W 25.00% -0.260 32.1 kg +20 W, cooler, +0.8 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +40 W, heavier, +0.7 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Cooler, lighter, +0.6 pp
TWMNH-48HC 450 W 16.66% -0.280 29.0 kg -205 W, lighter, -7.5 pp
TWMNH-54HD 515 W 19.07% -0.280 29.0 kg -140 W, lighter, -5.1 pp
TWMNH-66HD600 600 W 22.20% -0.280 32.5 kg -55 W, -2.0 pp
TWMNH-66HD605 605 W 22.40% -0.280 32.5 kg -50 W, -1.8 pp
TWMNH-66HD610 610 W 22.60% -0.280 32.5 kg -45 W, -1.6 pp
TWMNH-66HD615 615 W 22.80% -0.280 32.5 kg -40 W, -1.4 pp
TWMNH-66HD620 620 W 23.00% -0.280 32.5 kg -35 W, -1.2 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg Cooler, lighter, +0.6 pp

Found 1144 panels of the same or similar size to this one, within ±10 mm. See them here Found 1150 panels of the same or similar size to this one, within ±25 mm. See them here Found 1261 panels of the same or similar size to this one, within ±50 mm. See them here Found 1942 panels of the same or similar size to this one, within ±100 mm. See them here

About the TWMNH-66HD 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 power output of the Tongwei TWMNH-66HD panel and how many cells does it have?
The most powerful variant in the TWMNH-66HD series reaches 655 Wp with efficiency up to 24.2%. The module is built from 132 N-type half-cut cells in a dual-glass configuration, delivering high power density per unit area - important where roof or ground space is limited in C&I projects and PV farms.
What warranty comes with the Tongwei TWMNH-66HD solar panels?
The manufacturer provides a 12-year product warranty and a 30-year power output warranty, guaranteeing 99% of nominal power after the first year and no less than 87.4% after 30 years. Tongwei is a Tier 1 manufacturer headquartered in China, which adds confidence for long-term warranty support.
What is 908 Technology (0BB) used in the TWMNH-66HD, and what benefits does it offer?
908 Technology (0BB) is a busbar-free cell interconnection architecture based on multi-wire bonding. It reduces optical losses caused by busbar shading and improves mechanical resistance to microcracks that can occur during transport, installation, and operation. In practice, this means more stable energy output and lower risk of degradation from cell damage.
How much extra energy does bifaciality add on the TWMNH-66HD, and where does it perform best?
Thanks to high bifaciality, the module generates additional energy from its rear side by capturing light reflected off the ground - the gain depends on the mounting surface's albedo and typically ranges from a few to over a dozen percent of front-side power. This works best on PV farms with light-colored ground or gravel and in ground-mounted C&I installations where the panel is raised above the surface.
Are Tongwei TWMNH-66HD panels suitable for a sloped residential roof?
The TWMNH-66HD is a large module measuring about 2382x1134 mm and weighing around 32 kg, designed primarily for C&I installations and PV farms where maximum yield per square meter and low LCOE matter most. For typical sloped residential roofs, smaller and lighter modules are a better fit, as they're easier to transport and mount on rafters.
How does the TWMNH-66HD perform in high summer temperatures?
The module has a power temperature coefficient of -0.28%/°C, better than many P-type panels, meaning less power loss as cell operating temperature rises above 25°C. In practice, TWMNH-66HD panels lose less efficiency on hot days than older technologies, resulting in higher real-world energy production during summer.
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