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Tongwei Brand review

TWMNH-66HD

620 Wp TOPCon Bifacial 80%
ComparePV verdict

Strong in heat, no clear weak spot

Rank 2,013 of 14,005
Compare panels Datasheet PDF
Power (Wp)
620
Typical for its class
Efficiency (%)
22.95
Typical · median 22.80%
Density (Wp/m²)
229.5
Typical · median 227.7
Temp (%/°C)
-0.280
Strong · top 7%
Weight (kg)
29.0
Strong · 3.7 kg below median
Warranty (yrs)
30
Typical · median 30 yrs

The Tongwei TNC and THC panel series is a technological breakthrough based on N-type cells that redefines efficiency standards in modern photovoltaics. The use of advanced TOPCon and HJT structures allows for achieving parameters unavailable to older technologies, which directly translates to a greater amount of energy harvested from the same roof area. TNC models stand out with minimal annual degradation, providing investors with long-term security and financial stability throughout the entire service life. In turn, the THC line, based on heterojunction technology, offers an excellent temperature coefficient, thanks to which the modules operate extremely efficiently even during extreme summer heat. These products effectively solve the problem of limited installation space, delivering more power from every square meter of the installation. The manufacturer's unique vertical integration guarantees the highest quality of silicon, which distinguishes these series from the competition in terms of durability and purity of components. The TNC and THC series is the optimal choice for business and residential projects where the priority is maximizing energy yields while reducing operating costs. This is a solution for those looking for future technology ready to work in the demanding Polish climate.

Ranking

1,086 panels in the segment TOPCon 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 22.95% 22.80% Typical 2,268
Power density 229.5 227.7 Typical 2,191
Temperature coefficient -0.280 -0.290 Strong · top 7% 1,309
Weight per kWp 46.8 53.1 Strong · top 11% 1,343
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 7% of the TOPCon 600-650 W segment, against a median of -0.290. Ranked 1,309th in the whole database.

46.8 kg per kWp

Top 11% of the TOPCon 600-650 W segment, against a median of 53.1.

Notes from the database
  • At 22.9% efficiency, this panel is on par with typical TOPCon 600-650W modules
  • At 229.5 W/m² power density, roof space requirements are typical for TOPCon 600-650W panels
  • Temperature coefficient of -0.28%/°C matches the TOPCon 600-650W median
  • Weight of 29.0 kg (3.7 kg below TOPCon 600-650W median of 32.7 kg) allows easier transport and roof mounting
  • 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces

Specifications

Open datasheet PDF
Nominal power (Pmax) 620 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.95 % Typical Segment median 22.80%
Vmpp · Impp 40.82 V · 15.19 A Operating point at max power
Voc · Isc 49.10 V · 16.06 A Sizes the string length
Dimensions 2382×1134×30 mm · 2.70 m² of roof
Weight 29.0 kg Strong Strong · 3.7 kg below median
Cells 132 · TOPCon Monocrystalline
Bifaciality 80 % Rear output as a share of front
Coefficient Pmax -0.280 %/°C Strong top 7% of its segment
Coefficient Voc · Isc -0.240 · 0.046 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 15 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs

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 620 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
-
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-66HD 620 W 22.95% -0.280 29.0 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg +30 W, cooler, +2.2 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg +25 W, cooler, +2.1 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg +50 W, cooler, +1.9 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg +50 W, cooler, +1.9 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg +20 W, cooler, +1.9 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg +50 W, heavier, +1.9 pp
TWMNH-48HC 450 W 16.66% -0.280 29.0 kg -170 W, -6.3 pp
TWMNH-54HD 515 W 19.07% -0.280 29.0 kg -105 W, -3.9 pp
TWMNH-66HD600 600 W 22.20% -0.280 32.5 kg -20 W, heavier, -0.8 pp
TWMNH-66HD605 605 W 22.40% -0.280 32.5 kg -15 W, heavier, -0.6 pp
TWMNH-66HD610 610 W 22.60% -0.280 32.5 kg -10 W, heavier, -0.3 pp
TWMNH-66HD615 615 W 22.80% -0.280 32.5 kg Heavier
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +60 W, cooler, +2.2 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +55 W, cooler, +2.1 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +80 W, heavier, +2.1 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +75 W, heavier, +1.9 pp

Found 1119 panels of the same or similar size to this one, within ±10 mm. See them here Found 1125 panels of the same or similar size to this one, within ±25 mm. See them here Found 1236 panels of the same or similar size to this one, within ±50 mm. See them here Found 1917 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What is the difference between Tongwei's TNC and THC panel series?
The TNC series uses N-type TOPCon cells, delivering high efficiency and minimal annual degradation, ideal for projects focused on stable, long-term energy yield. The THC series is based on heterojunction (HJT) technology, offering a better temperature coefficient so modules lose less power during hot weather. The choice depends on installation climate and investment priorities.
What is the maximum power output of Tongwei TNC and THC panels?
The most powerful variants in both series reach up to 740 Wp, placing them among the top-tier bifacial N-type modules currently available. Higher wattage per panel reduces the number of modules needed to reach a target system size, lowering mounting structure and installation labor costs.
Are Tongwei TNC/THC panels bifacial, and is it worth it?
Yes, both series feature bifacial construction, allowing panels to generate additional energy from light reflected off the ground or roof surface. This typically boosts overall energy yield, especially with bright surfaces or elevated ground-mount installations. The bifacial gain is less pronounced on standard dark-roof residential installations.
What warranty comes with Tongwei TNC and THC series panels?
The manufacturer offers a 15-year product warranty and a 30-year linear power warranty, among the longest currently available in the PV market. This warranty structure gives investors confidence in long-term durability and predictable energy output over the entire lifespan of the installation.
Is Tongwei a reliable, established solar panel manufacturer?
Tongwei is a Tier 1 manufacturer headquartered in China with full vertical integration, from polysilicon production through to finished modules. This supply chain control ensures consistent, high-quality silicon and stable production output, which matters for larger commercial and industrial-scale projects.
Do Tongwei TOPCon panels perform well in hot summer conditions?
Yes, the TOPCon and HJT cells used in the TNC and THC series have a favorable temperature coefficient, limiting power loss at high module operating temperatures compared to older technologies like PERC. This matters especially in summer, when rooftop panel temperatures can significantly exceed ambient air temperature.
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