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Tongwei Brand review

TWMHF-66HD700

700 Wp HJT Bifacial 90%
ComparePV verdict

Middle of its segment, modest efficiency

Rank 950 of 14,129
Compare panels Datasheet PDF
Power (Wp)
700
Weak · bottom 8%
Efficiency (%)
22.50
Weak · bottom 4%
Density (Wp/m²)
225.3
Weak · bottom 8%
Temp (%/°C)
-0.240
Typical · median -0.240
Weight (kg)
37.5
Typical · median 38.3 kg
Warranty (yrs)
30
Typical · median 30 yrs

Tongwei TWMHF photovoltaic panels are an advanced solution based on HJT cell technology, which pushes the efficiency limits of traditional silicon modules. This series combines the advantages of crystalline and thin-film silicon, which translates into exceptional energy conversion efficiency even on heavily cloudy days. A key advantage of the design is an extremely low temperature coefficient, thanks to which the modules lose significantly less power on hot days compared to standard P-type technologies. The use of N-type cells completely eliminates light-induced degradation, ensuring stable parameters for decades. The TWMHF series solves the problem of limited installation space by offering maximization of energy yield per square meter, making it an ideal choice for demanding prosumers and photovoltaic farms focused on a fast return on investment. What distinguishes them from competitors' products is the use of an innovative bifacial structure, allowing for the effective use of reflected light. Solid construction and high resistance to mechanical loads guarantee installation safety in the variable Polish climate. This is a product dedicated to investors seeking uncompromising quality and the latest solar engineering achievements that realistically increase the profitability of every PV system.

Ranking

222 panels in the segment HJT 700-750 W
Metric This panel Median Position in segment Overall rank
Module efficiency 22.50% 23.02% Weak · bottom 4% 4,281
Power density 225.3 230.2 Weak · bottom 8% 4,048
Temperature coefficient -0.240 -0.240 Typical 13
Weight per kWp 53.6 53.6 Typical 7,655
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 2 caution
Best for

Utility-scale and hot-climate.

Not ideal for

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

Watch-outs
22.50% module efficiency

Bottom 4% of the HJT 700-750 W segment, against a median of 23.02%. Ranked 4,281st in the whole database.

225.3 watts per square metre

Bottom 8% of the HJT 700-750 W segment, against a median of 230.2. Ranked 4,048th in the whole database.

Notes from the database
  • Efficiency of 22.5% is 0.5pp below the HJT 700-750W median (23.0%)
  • At 225.3 W/m², this panel generates 4.9 W/m² less per unit area than HJT 700-750W median (230.2 W/m²)
  • Temperature coefficient of -0.24%/°C matches the HJT 700-750W median
  • Bifacial design (90% factor) captures reflected light - adds 4-14% yield on ground-mount or white roof
  • #4281 for efficiency, #13 for temperature performance out of 14129 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 700 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.50 % Weak Segment median 23.02%
Vmpp · Impp 42.17 V · 16.60 A Operating point at max power
Voc · Isc 50.14 V · 17.45 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2384×1303×35 mm · 3.11 m² of roof
Weight 37.5 kg Typical Typical · median 38.3 kg
Cells 132 · HJT Monocrystalline
Bifaciality 90 % Rear output as a share of front
Coefficient Pmax -0.240 %/°C Typical median -0.240 of its segment
Coefficient Voc · Isc -0.220 · 0.040 %/°C
NOCT 44 °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
End-of-warranty output 88.1 % Equals 617 W guaranteed
Degradation 1.00 → 0.38 % 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 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 Power-Voltage (P-V) Curve Power-Voltage (P-V) Curve 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
-0.240 %/°C against a segment median of -0.240
-
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 TWMHF-66HD700 700 W 22.50% -0.240 37.5 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 Hotter, 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 Hotter, lighter, +2.5 pp
WST-675BKX72-A2 675 W 25.00% -0.260 32.1 kg -25 W, lighter, +2.5 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg Hotter, 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
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 Hotter
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +105 W, heavier, +2.6 pp
AIKO-A800-GRH78Dw 800 W 24.90% -0.260 39.8 kg +100 W, heavier, +2.4 pp

Found 1393 panels of the same or similar size to this one, within ±10 mm. See them here Found 1403 panels of the same or similar size to this one, within ±25 mm. See them here Found 1403 panels of the same or similar size to this one, within ±50 mm. See them here Found 1435 panels of the same or similar size to this one, within ±100 mm. See them here

About the TWMHF series

6 answered

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

What is HJT technology used in Tongwei TWMHF panels and how does it differ from PERC or TOPCon?
HJT (heterojunction) combines crystalline silicon with thin amorphous silicon layers, delivering higher conversion efficiency and lower thermal losses than classic PERC cells. Compared to TOPCon, HJT cells have an even lower temperature coefficient and perform better under diffuse light, such as on cloudy days, resulting in higher energy yield under variable irradiance conditions.
Are bifacial Tongwei TWMHF panels worth installing on a pitched roof, or only on the ground?
The bifacial design works best on ground-mounted racking, carports, or elevated flat-roof installations, where the rear side can capture light reflected from the ground. On a standard pitched roof, the bifacial gain is limited due to lack of space beneath the panel, but the module still performs well as a high-efficiency monofacial panel.
What warranty do Tongwei TWMHF solar panels come with?
TWMHF panels are backed by a 15-year product warranty and a 30-year linear power warranty, exceeding the standard 25 years typical of PERC-based modules. The extended power warranty results from the N-type cells, which are not subject to light-induced degradation (LID), making power output decline slower and more predictable over the panel's lifetime.
Do Tongwei TWMHF panels lose less power on hot days than standard modules?
Yes, a key advantage of HJT technology is a very low power temperature coefficient, meaning the module loses significantly less efficiency as cell temperature rises above 25°C. In practice, on hot sunny days a TWMHF panel generates higher energy yield than a comparably rated P-type module, which experiences noticeably larger power drops in heat.
Are Tongwei TWMHF panels rated up to 720 Wp suitable for limited roof space?
Yes, the high unit power of up to 720 Wp allows a higher total system capacity with fewer modules, which is valuable on limited roof space. This maximizes energy production per square meter, a benefit especially appreciated by installers working on small or irregularly shaped roofs where achieving target system power is otherwise difficult.
Is the Tongwei TWMHF series still available for purchase?
The TWMHF series has been discontinued by Tongwei and replaced by newer HJT module families. Units may still be available through distributors as remaining stock, but buyers should verify current inventory and confirm warranty support with the seller, since the manufacturer no longer accepts new orders for this specific model.
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