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Tongwei Brand review

TWMNH-66HS635

635 Wp N-type
ComparePV verdict

Light for its output, no clear weak spot

Rank 1,712 of 14,129
Compare panels Datasheet PDF
Power (Wp)
635
Strong · top 22%
Efficiency (%)
23.50
Strong · top 12%
Density (Wp/m²)
235.1
Strong · top 12%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
29.0
Strong · 3.8 kg below median
Warranty (yrs)
30
Typical · median 30 yrs

Tongwei TWMNH series photovoltaic panels are based on advanced N-type TOPCon cells, which represents a significant technological leap compared to traditional P-type modules. The use of Super Multi-Busbar (SMBB) technology allows for more efficient light capturing and a significant reduction in the current flow path, which directly translates into lower internal power losses. For investors, an effective solution to the problem of degradation caused by light and high ambient temperatures is key - the TWMNH series is characterized by exceptional resistance to LID and LeTID degradation and a very favorable temperature coefficient. As a result, photovoltaic systems operate extremely efficiently even on hot summer days, generating more energy from the same roof or ground area. These modules are primarily dedicated to demanding commercial and industrial installations, where the priority is maximizing the return on investment in the long term. What clearly distinguishes them from market competition is their high efficiency in low-light conditions and precise quality control at every stage of cell production, which guarantees full repeatability of technical parameters. By choosing the TWMNH series, the investor gains the assurance of stable and failure-free system operation for many decades, making these panels one of the most cost-effective choices in today's modern photovoltaics market.

Ranking

368 panels in the segment N-type 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.50% 22.77% Strong · top 12% 749
Power density 235.1 227.7 Strong · top 12% 777
Temperature coefficient -0.290 -0.290 Typical 2,220
Weight per kWp 45.7 52.8 Strong · top 7% 833
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 hot-climate.

Strengths
45.7 kg per kWp

Top 7% of the N-type 600-650 W segment, against a median of 52.8. Ranked 833rd in the whole database.

235.1 watts per square metre

Top 12% of the N-type 600-650 W segment, against a median of 227.7.

23.50% module efficiency

Top 12% of the N-type 600-650 W segment, against a median of 22.77%.

Notes from the database
  • At 23.5% efficiency, this panel is 0.7pp above typical N-type 600-650W modules (median: 22.8%)
  • Power density of 235.1 W/m² packs 7.4 W/m² more into the same footprint vs N-type 600-650W median (227.7 W/m²)
  • Temperature coefficient of -0.29%/°C matches the N-type 600-650W median
  • At 29.0 kg, this panel is 3.8 kg lighter than N-type 600-650W median (32.8 kg) - easier handling during installation
  • In the top 5% for efficiency among all N-type panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 635 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.50 % Strong Segment median 22.77%
Vmpp · Impp 41.11 V · 15.45 A Operating point at max power
Voc · Isc 49.65 V · 16.26 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2382×1134×35 mm · 2.70 m² of roof
Weight 29.0 kg Strong Strong · 3.8 kg below median
Cells 132 · N-type Monocrystalline
Coefficient Pmax -0.290 %/°C Typical median -0.290 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 555 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 635 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

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
-

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

Heat losses
-0.290 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Tongwei TWMNH-66HS635 635 W 23.50% -0.290 29.0 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +1.7 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +45 W, cooler, +1.7 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +40 W, cooler, +1.5 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +1.5 pp
WST-675BKX72-A2 675 W 25.00% -0.260 32.1 kg +40 W, heavier, +1.5 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg +35 W, cooler, +1.3 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg +35 W, cooler, +1.3 pp
TWMNH-48HC 450 W 16.66% -0.280 29.0 kg -185 W, -6.8 pp
TWMNH-54HD 515 W 19.07% -0.280 29.0 kg -120 W, -4.4 pp
TWMNH-66HD600 600 W 22.20% -0.280 32.5 kg -35 W, heavier, -1.3 pp
TWMNH-66HD605 605 W 22.40% -0.280 32.5 kg -30 W, heavier, -1.1 pp
TWMNH-66HD610 610 W 22.60% -0.280 32.5 kg -25 W, heavier, -0.9 pp
TWMNH-66HD615 615 W 22.80% -0.280 32.5 kg -20 W, heavier, -0.7 pp
TWMNH-66HD620 620 W 23.00% -0.280 32.5 kg -15 W, heavier, -0.5 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +65 W, heavier, +1.5 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +60 W, heavier, +1.4 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 series

6 answered

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

How does N-type TOPCon cell technology in the Tongwei TWMNH series differ from traditional P-type cells?
N-type TOPCon cells used in the TWMNH series feature an additional passivation layer that significantly reduces electron recombination on the rear side of the cell. In practice, this delivers higher efficiency (often above 23%), lower degradation over time, and better performance at high temperatures compared to classic P-type PERC modules. It's a newer-generation technology now considered the premium standard in solar.
What warranty comes with Tongwei TWMNH panels and what does it cover?
The TWMNH series comes with a 15-year product warranty covering material and manufacturing defects, plus a 30-year linear power output warranty. This means the manufacturer guarantees a defined minimum energy generation level over three decades, with a slow, predictable power decline over time - an important factor when calculating long-term return on investment.
Are Tongwei TWMNH panels rated at 635 W suitable for residential installations, or only commercial ones?
TWMNH panels rated up to 635 Wp have large form factors and high output current, making them primarily designed for commercial, industrial, and utility-scale solar farm installations where maximizing power per square meter matters most. On a typical sloped residential roof they may be too large and heavy for convenient installation - smaller residential-class modules are usually a better fit in that case.
Are Tongwei TWMNH panels bifacial, generating power from the rear side as well?
No, TWMNH series panels in this configuration are mono-facial modules - they generate power only from the front side. This makes installation simpler and less dependent on ground reflectivity compared to bifacial panels, which need a bright, light-reflecting surrounding surface to fully exploit rear-side generation potential.
How do TWMNH panels perform during summer heat on a hot rooftop?
Thanks to TOPCon cell technology and Super Multi-Busbar (SMBB) design, the TWMNH series has a favorable power temperature coefficient, meaning less output loss as module temperature rises on hot days. These panels are also resistant to LID and LeTID degradation, caused by the combination of light exposure and high heat, so they retain more power in summer than typical P-type modules.
Is Tongwei a reliable Tier 1 solar panel manufacturer, and are TWMNH panels a safe investment choice?
Yes, Tongwei is a Chinese manufacturer classified as Tier 1, reflecting its financial stability, large-scale cell production, and long-standing international market presence. The TWMNH series undergoes rigorous quality control at every production stage, and these models remain in active production and available for purchase, making them a safe choice for long-term commercial investments.
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