Tongwei THC G12-66 Bifacial vs Tongwei TWMNF-66HD730
VS
The verdict
THC G12-66 Bifacial leads on the differences that matter
The largest is product warranty: 3 yrs longer. 13 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 5 differencesHow alike are they
13
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
5 of 18 parameters
What actually differs
Parameter
THC G12-66 Bifacial
TWMNF-66HD730
Difference
Product warranty
15 yrs
12 yrs
3 yrs longer
Module efficiency
23.80 %
23.50 %
0.30 pp more efficient
Power density
238.2 Wp/m²
235.0 Wp/m²
3.2 Wp/m² higher
Rated power
740 Wp
730 Wp
10 W more power
Open-circuit voltage
50.62 V
49.55 V
1.07 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.
THC G12-66 Bifacial
24,828 kWh
TWMNF-66HD730
24,493 kWh
Lifetime gap
335 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
THC G12-66 Bifacial
TWMNF-66HD730
Standard test conditions
25 °C
100.0% of rated power
740 W
730 W
Cool, bright day
40 °C
95.8% of rated power
709 W
699 W
Typical summer roof
55 °C
91.6% of rated power
678 W
669 W
Hot roof
70 °C
87.4% of rated power
647 W
638 W
03
Full specification
Parameter
THC G12-66 Bifacial
TWMNF-66HD730
Difference
Power and efficiency
Rated power
740 Wp
730 Wp
+10 W for THC G12-66 Bifacial
Module efficiency
23.80 %
23.50 %
+0.30 pp for THC G12-66 Bifacial
Power density
238.2 Wp/m²
235.0 Wp/m²
+3.2 Wp/m² for THC G12-66 Bifacial
Open-circuit voltage
50.62 V
49.55 V
1.07 V apart
Voltage at max power
42.32 V
41.37 V
Effectively the same
Short-circuit current
18.47 A
18.68 A
Effectively the same
Current at max power
17.49 A
17.65 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
51.1 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
#716
THC G12-66 Bifacial leads by 283 places
Power density
#431
vs
#800
THC G12-66 Bifacial leads by 369 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#3,317
vs
#4,435
THC G12-66 Bifacial leads by 1,118 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#130
vs
#302
THC G12-66 Bifacial leads by 172 places
05
Open the full database
More useful comparisons
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Tongwei THC G12-66 Bifacial vs Tongwei TWMNH-66HD
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Tongwei THC G12-66 Bifacial vs Tongwei TWMNH-48HC
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Tongwei TWMNF-66HD730 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-66HD730?
According to our database: Tongwei THC G12-66 Bifacial has higher module efficiency (23.80% vs 23.50%). 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-66HD730?
Tongwei THC G12-66 Bifacial has a module efficiency of 23.80%, while Tongwei TWMNF-66HD730 is 23.50%. 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-66HD730?
Tongwei THC G12-66 Bifacial uses TOPCon cells; Tongwei TWMNF-66HD730 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-66HD730?
Tongwei THC G12-66 Bifacial has a 30 years power warranty; Tongwei TWMNF-66HD730 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-66HD730 bifacial panels?
Both Tongwei THC G12-66 Bifacial and Tongwei TWMNF-66HD730 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 53 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.