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Tongwei Brand review

TWMNH-66HD605

605 Wp TOPCon Bifacial 80%
ComparePV verdict

Strong in heat, modest efficiency

Rank 3,690 of 14,005
Compare panels Datasheet PDF
Power (Wp)
605
Weak · bottom 15%
Efficiency (%)
22.40
Weak · bottom 23%
Density (Wp/m²)
224.0
Weak · bottom 23%
Temp (%/°C)
-0.280
Strong · top 7%
Weight (kg)
32.5
Typical · median 32.7 kg
Warranty (yrs)
30
Typical · median 30 yrs

The Tongwei TWMNH Bifacial Module (66) series is based on breakthrough N-type TOPCon cell technology, which effectively eliminates the problem of light-induced degradation and ensures higher efficiency in real-world weather conditions. The use of a bifacial (double-sided) design allows for effective energy generation not only from direct sunlight but also from rays reflected from the surroundings, which significantly increases the total energy yield of the system. These modules solve the problem of power drops during hot weather thanks to an exceptionally favorable temperature coefficient, which clearly distinguishes them from standard panels. This solution is primarily dedicated to demanding business investors and designers of photovoltaic farms, where maximizing the yield per unit area is of key importance. Thanks to the use of advanced multi-busbar technology, the panels are characterized by minimal internal losses and excellent resistance to mechanical loads. By choosing this series, the investor gains above-average durability and stability of parameters over a long time horizon, making it one of the most cost-effective options in the high-efficiency segment. It is the optimal choice for modern installations that must meet strict efficiency requirements, guaranteeing high energy reliability over many years of use.

Ranking

1,086 panels in the segment TOPCon 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 22.40% 22.80% Weak · bottom 23% 4,774
Power density 224.0 227.7 Weak · bottom 23% 4,780
Temperature coefficient -0.280 -0.290 Strong · top 7% 1,309
Weight per kWp 53.7 53.1 Typical 7,739
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 hot-climate.

Not ideal for

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

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.

Watch-outs
22.40% module efficiency

Bottom 23% of the TOPCon 600-650 W segment, against a median of 22.80%.

224.0 watts per square metre

Bottom 23% of the TOPCon 600-650 W segment, against a median of 227.7.

Notes from the database
  • Efficiency of 22.4% matches the TOPCon 600-650W median
  • At 224.0 W/m², this panel generates 3.7 W/m² less per unit area than TOPCon 600-650W median (227.7 W/m²)
  • Temperature coefficient of -0.28%/°C matches the TOPCon 600-650W median
  • Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof
  • In the top 34% for efficiency among all TOPCon panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 605 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.40 % Weak Segment median 22.80%
Vmpp · Impp 40.95 V · 14.78 A Operating point at max power
Voc · Isc 47.70 V · 15.80 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 32.5 kg Typical Typical · median 32.7 kg
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 12 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 529 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 605 Wp appear here. The rest cover the whole series.

Linear Power Output Warranty Linear Power Output Warranty Whole series I-V Curve (Current vs Voltage, Cell temperature 25°C) I-V Curve (Current vs Voltage, 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-66HD605 605 W 22.40% -0.280 32.5 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg +45 W, lighter, +2.8 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg +40 W, lighter, +2.6 pp
LR7-60HVH-560M 560 W 24.80% -0.260 25.0 kg -45 W, lighter, +2.4 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg +35 W, lighter, +2.4 pp
LR7-60HVH-555M 555 W 24.60% -0.260 25.0 kg -50 W, lighter, +2.2 pp
AIKO-A635-MAE72Mw 635 W 24.60% -0.260 27.0 kg +30 W, lighter, +2.2 pp
TWMNH-48HC 450 W 16.66% -0.280 29.0 kg -155 W, lighter, -5.7 pp
TWMNH-54HD 515 W 19.07% -0.280 29.0 kg -90 W, lighter, -3.3 pp
TWMNH-66HD600 600 W 22.20% -0.280 32.5 kg Very close match
TWMNH-66HD610 610 W 22.60% -0.280 32.5 kg +0.2 pp
TWMNH-66HD615 615 W 22.80% -0.280 32.5 kg +10 W, +0.4 pp
TWMNH-66HD620 620 W 23.00% -0.280 32.5 kg +15 W, +0.6 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +75 W, lighter, +2.8 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +70 W, lighter, +2.6 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +95 W, cooler, +2.6 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +90 W, cooler, +2.5 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 maximum power output of the Tongwei TWMNH Bifacial Module (66)?
Modules from the TWMNH Bifacial (66) series reach a maximum power output of up to 605 Wp. This is achieved through high-efficiency N-type TOPCon cells combined with a bifacial design that further boosts real-world energy yield. This power class places the series in the high-performance segment, appealing for PV farms and large commercial installations where energy output per square meter of roof or ground matters most.
Is the Tongwei TWMNH Bifacial Module (66) series still available for purchase?
No, production of the TWMNH Bifacial Module (66) series has ended and the model has been discontinued from the manufacturer's current lineup. Panels may still be found through distributors as remaining stock, but buyers should verify the production date and warranty validity, or consider newer Tongwei models with comparable or improved specifications as an alternative.
How does N-TOPCon technology in the Tongwei TWMNH modules differ from standard PERC panels?
N-TOPCon cells use an N-type silicon wafer, unlike the P-type substrate common in PERC cells, making them significantly less susceptible to light-induced degradation (LID) and light- and elevated-temperature-induced degradation (LeTID). As a result, TWMNH modules maintain higher efficiency throughout their service life, and their improved temperature coefficient means smaller power losses on hot days.
What warranty comes with the Tongwei TWMNH Bifacial Module (66)?
The manufacturer provides a 12-year product warranty covering material and workmanship defects, along with a 30-year power output warranty guaranteeing the module maintains its rated performance over the long term. This is a standard benchmark for high-end TOPCon panels and an important factor when calculating the return on investment over decades of system operation.
Are Tongwei TWMNH bifacial panels suitable for large ground-mounted solar farms?
Yes, the bifacial design of this series performs especially well in ground-mounted installations, where the rear side of the module can capture additional energy from light reflected off the ground, such as light-colored gravel or grass. Combined with power output up to 605 Wp, TWMNH modules help maximize energy yield per unit of surface area, a key consideration for commercial solar farm investors.
Is Tongwei a Tier 1 manufacturer, and what does that mean for buyers of TWMNH panels?
Yes, Tongwei holds Tier 1 manufacturer status, reflecting strong financial stability, high production capacity, and proven reliability as tracked by independent industry analyses such as Bloomberg NEF. For buyers, this translates into lower risk when it comes to honoring warranty claims down the line and confidence in the manufacturing process quality, even though the TWMNH (66) series itself has since been discontinued.
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