Tongwei TWMNF-66HD720 vs Tongwei THC G12-66 Bifacial
VS
The verdict
THC G12-66 Bifacial leads on the differences that matter
The largest is module efficiency: 0.60 pp more efficient. 11 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 7 differencesHow alike are they
11
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
7 of 18 parameters
What actually differs
Parameter
TWMNF-66HD720
THC G12-66 Bifacial
Difference
Module efficiency
23.20 %
23.80 %
0.60 pp more efficient
Product warranty
12 yrs
15 yrs
3 yrs longer
Power density
231.8 Wp/m²
238.2 Wp/m²
6.4 Wp/m² higher
Rated power
720 Wp
740 Wp
20 W more power
Weight per kWp
52.6 kg/kWp
50.0 kg/kWp
2.6 kg/kWp lighter
Open-circuit voltage
49.28 V
50.62 V
1.34 V apart
Voltage at max power
41.03 V
42.32 V
1.29 V apart
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.
TWMNF-66HD720
24,157 kWh
THC G12-66 Bifacial
24,828 kWh
Lifetime gap
671 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
TWMNF-66HD720
THC G12-66 Bifacial
Standard test conditions
25 °C
100.0% of rated power
720 W
740 W
Cool, bright day
40 °C
95.8% of rated power
690 W
709 W
Typical summer roof
55 °C
91.6% of rated power
660 W
678 W
Hot roof
70 °C
87.4% of rated power
629 W
647 W
03
Full specification
Parameter
TWMNF-66HD720
THC G12-66 Bifacial
Difference
Power and efficiency
Rated power
720 Wp
740 Wp
+20 W for THC G12-66 Bifacial
Module efficiency
23.20 %
23.80 %
+0.60 pp for THC G12-66 Bifacial
Power density
231.8 Wp/m²
238.2 Wp/m²
+6.4 Wp/m² for THC G12-66 Bifacial
Open-circuit voltage
49.28 V
50.62 V
1.34 V apart
Voltage at max power
41.03 V
42.32 V
1.29 V apart
Short-circuit current
18.55 A
18.47 A
Effectively the same
Current at max power
17.55 A
17.49 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
37.9 kg
37.0 kg
Effectively the same
Weight per kWp
52.6 kg/kWp
50.0 kg/kWp
-2.6 kg/kWp for THC G12-66 Bifacial
Warranty and degradation
Product warranty
12 yrs
15 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
#1,306
vs
#433
THC G12-66 Bifacial leads by 873 places
Power density
#1,347
vs
#431
THC G12-66 Bifacial leads by 916 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#6,266
vs
#3,317
THC G12-66 Bifacial leads by 2,949 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#516
vs
#130
THC G12-66 Bifacial leads by 386 places
05
Open the full database
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The same specification on paper
06
Written summary
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07
Questions about this pairing
Which panel is better: Tongwei TWMNF-66HD720 or Tongwei THC G12-66 Bifacial?
According to our database: Tongwei THC G12-66 Bifacial has higher module efficiency (23.80% vs 23.20%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TWMNF-66HD720 and Tongwei THC G12-66 Bifacial?
Tongwei TWMNF-66HD720 has a module efficiency of 23.20%, while Tongwei THC G12-66 Bifacial is 23.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TWMNF-66HD720 use vs Tongwei THC G12-66 Bifacial?
Tongwei TWMNF-66HD720 uses TOPCon cells; Tongwei THC G12-66 Bifacial 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 TWMNF-66HD720 and Tongwei THC G12-66 Bifacial?
Tongwei TWMNF-66HD720 has a 30 years power warranty; Tongwei THC G12-66 Bifacial 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 TWMNF-66HD720 and Tongwei THC G12-66 Bifacial bifacial panels?
Both Tongwei TWMNF-66HD720 and Tongwei THC G12-66 Bifacial 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.