Tongwei TWMNF-66HD745 vs Tongwei THC G12-66 Bifacial
VS
The verdict
THC G12-66 Bifacial leads on the differences that matter
The largest is product warranty: 3 yrs longer. 16 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 2 differencesHow alike are they
16
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
2 of 18 parameters
What actually differs
Parameter
TWMNF-66HD745
THC G12-66 Bifacial
Difference
Product warranty
12 yrs
15 yrs
3 yrs longer
Module efficiency
24.00 %
23.80 %
0.20 pp more efficient
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-66HD745
24,996 kWh
THC G12-66 Bifacial
24,828 kWh
Lifetime gap
168 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
TWMNF-66HD745
THC G12-66 Bifacial
Standard test conditions
25 °C
100.0% of rated power
745 W
740 W
Cool, bright day
40 °C
95.8% of rated power
714 W
709 W
Typical summer roof
55 °C
91.6% of rated power
682 W
678 W
Hot roof
70 °C
87.4% of rated power
651 W
647 W
03
Full specification
Parameter
TWMNF-66HD745
THC G12-66 Bifacial
Difference
Power and efficiency
Rated power
745 Wp
740 Wp
Effectively the same
Module efficiency
24.00 %
23.80 %
+0.20 pp for TWMNF-66HD745
Power density
239.8 Wp/m²
238.2 Wp/m²
Effectively the same
Open-circuit voltage
49.95 V
50.62 V
Effectively the same
Voltage at max power
41.86 V
42.32 V
Effectively the same
Short-circuit current
18.87 A
18.47 A
Effectively the same
Current at max power
17.80 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
37.3 kg
37.0 kg
Effectively the same
Weight per kWp
50.1 kg/kWp
50.0 kg/kWp
Effectively the same
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
#303
vs
#433
TWMNF-66HD745 leads by 130 places
Power density
#339
vs
#431
TWMNF-66HD745 leads by 92 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#3,586
vs
#3,317
THC G12-66 Bifacial leads by 269 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#148
vs
#130
THC G12-66 Bifacial leads by 18 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: Tongwei TWMNF-66HD745 or Tongwei THC G12-66 Bifacial?
According to our database: Tongwei TWMNF-66HD745 has higher module efficiency (24.00% vs 23.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TWMNF-66HD745 and Tongwei THC G12-66 Bifacial?
Tongwei TWMNF-66HD745 has a module efficiency of 24.00%, 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-66HD745 use vs Tongwei THC G12-66 Bifacial?
Tongwei TWMNF-66HD745 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-66HD745 and Tongwei THC G12-66 Bifacial?
Tongwei TWMNF-66HD745 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-66HD745 and Tongwei THC G12-66 Bifacial bifacial panels?
Both Tongwei TWMNF-66HD745 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.