Tongwei THC G12-66 Bifacial vs Tongwei TWMNF-66HD740
VS
The verdict
THC G12-66 Bifacial leads on the differences that matter
The largest is product warranty: 3 yrs longer. 17 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See the one differenceHow alike are they
17
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
1 of 18 parameters
What actually differs
Parameter
THC G12-66 Bifacial
TWMNF-66HD740
Difference
Product warranty
15 yrs
12 yrs
3 yrs longer
02
What it means on a roof
Thirty years of production
A 1.0% first-year loss then 0.40% a year, assumed for both panels, at 1,200 kWh/kWp a year
Same temp coeff. for both panels (-0.280 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
THC G12-66 Bifacial
24,828 kWh
TWMNF-66HD740
24,828 kWh
Lifetime gap
No difference
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
THC G12-66 Bifacial
TWMNF-66HD740
Standard test conditions
25 °C
100.0% of rated power
740 W
740 W
Cool, bright day
40 °C
95.8% of rated power
709 W
709 W
Typical summer roof
55 °C
91.6% of rated power
678 W
678 W
Hot roof
70 °C
87.4% of rated power
647 W
647 W
03
Full specification
Parameter
THC G12-66 Bifacial
TWMNF-66HD740
Difference
Power and efficiency
Rated power
740 Wp
740 Wp
Same
Module efficiency
23.80 %
23.80 %
Same
Power density
238.2 Wp/m²
238.2 Wp/m²
Same
Open-circuit voltage
50.62 V
49.80 V
Effectively the same
Voltage at max power
42.32 V
41.69 V
Effectively the same
Short-circuit current
18.47 A
18.81 A
Effectively the same
Current at max power
17.49 A
17.75 A
Effectively the same
Temperature
Temperature coefficient
-0.280 %/°C
-0.280 %/°C
Same
Mechanical
Dimensions
2384x1303x33 mm
2384x1303x33 mm
Same
Module area
3.106 m²
3.106 m²
Same
Weight
37.0 kg
37.3 kg
Effectively the same
Weight per kWp
50.0 kg/kWp
50.4 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
15 yrs
12 yrs
+3 yrs for THC G12-66 Bifacial
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
-
0.40 %/yr
Not published by Tongwei
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
132
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#433
vs
#433
Tied - the same position in the database
Power density
#431
vs
#431
Tied - the same position in the database
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#3,317
vs
#3,784
THC G12-66 Bifacial leads by 467 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#130
vs
#183
THC G12-66 Bifacial leads by 53 places
05
Open the full database
More useful comparisons
Same series, other bin
Tongwei THC G12-66 Bifacial vs Tongwei TWMNF-66HD
6 differences, the largest is module efficiency
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Tongwei THC G12-66 Bifacial vs Tongwei TWMNH-66HS
11 differences, the largest is module efficiency
Same series, other bin
Tongwei THC G12-66 Bifacial vs Tongwei TWMNH-66HD
11 differences, the largest is module efficiency
Same series, other bin
Tongwei THC G12-66 Bifacial vs Tongwei TWMNH-54HD
11 differences, the largest is module efficiency
Same series, other bin
Tongwei THC G12-66 Bifacial vs Tongwei TWMNH-48HC
11 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMNF-66HD740 vs Tongwei TWMNF-66HD750
3 differences, the largest is module efficiency
06
Written summary
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07
Questions about this pairing
Which panel is better: Tongwei THC G12-66 Bifacial or Tongwei TWMNF-66HD740?
According to our database: both panels are closely matched on key specs - the decision often comes down to price and local availability. See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei THC G12-66 Bifacial and Tongwei TWMNF-66HD740?
Tongwei THC G12-66 Bifacial has a module efficiency of 23.80%, while Tongwei TWMNF-66HD740 is 23.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei THC G12-66 Bifacial use vs Tongwei TWMNF-66HD740?
Tongwei THC G12-66 Bifacial uses TOPCon cells; Tongwei TWMNF-66HD740 uses TOPCon. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.
What is the warranty on Tongwei THC G12-66 Bifacial and Tongwei TWMNF-66HD740?
Tongwei THC G12-66 Bifacial has a 30 years power warranty; Tongwei TWMNF-66HD740 has a 30 years power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80-87%). Product (materials) warranties are usually shorter.
Are Tongwei THC G12-66 Bifacial and Tongwei TWMNF-66HD740 bifacial panels?
Both Tongwei THC G12-66 Bifacial and Tongwei TWMNF-66HD740 are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.
Shop prices: See 71 Tongwei offers
Every figure here is from the manufacturers' own datasheets - a dash means the value is not published, never an estimate. The thirty-year projection and the temperature scenarios are calculations from those figures, and each states its assumption above.