Tongwei TWMNH-66HS vs Tongwei THC G12-66 Bifacial
VS
The verdict
THC G12-66 Bifacial leads on the differences that matter
The largest is module efficiency: 0.66 pp more efficient. 7 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 11 differencesHow alike are they
7
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
11 of 18 parameters
What actually differs
Parameter
TWMNH-66HS
THC G12-66 Bifacial
Difference
Module efficiency
23.14 %
23.80 %
0.66 pp more efficient
Rated power
625 Wp
740 Wp
115 W more power
Weight
29.0 kg
37.0 kg
8.0 kg lighter
Power density
231.4 Wp/m²
238.2 Wp/m²
6.8 Wp/m² higher
Short-circuit current
16.14 A
18.47 A
2.33 A apart
Module area
2.701 m²
3.106 m²
0.405 m² apart
Weight per kWp
46.4 kg/kWp
50.0 kg/kWp
3.6 kg/kWp lighter
Current at max power
15.33 A
17.49 A
2.16 A apart
Open-circuit voltage
49.25 V
50.62 V
1.37 V apart
Dimensions
2382x1134x30 mm
2384x1303x33 mm
2382x1134x30 mm vs 2384x1303x33 mm
Voltage at max power
40.77 V
42.32 V
1.55 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.
TWMNH-66HS
20,970 kWh
THC G12-66 Bifacial
24,828 kWh
Lifetime gap
3,858 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
TWMNH-66HS
THC G12-66 Bifacial
Standard test conditions
25 °C
100.0% of rated power
625 W
740 W
Cool, bright day
40 °C
95.8% of rated power
599 W
709 W
Typical summer roof
55 °C
91.6% of rated power
573 W
678 W
Hot roof
70 °C
87.4% of rated power
546 W
647 W
03
Full specification
Parameter
TWMNH-66HS
THC G12-66 Bifacial
Difference
Power and efficiency
Rated power
625 Wp
740 Wp
+115 W for THC G12-66 Bifacial
Module efficiency
23.14 %
23.80 %
+0.66 pp for THC G12-66 Bifacial
Power density
231.4 Wp/m²
238.2 Wp/m²
+6.8 Wp/m² for THC G12-66 Bifacial
Open-circuit voltage
49.25 V
50.62 V
1.37 V apart
Voltage at max power
40.77 V
42.32 V
1.55 V apart
Short-circuit current
16.14 A
18.47 A
2.33 A apart
Current at max power
15.33 A
17.49 A
2.16 A apart
Temperature
Temperature coefficient
-0.280 %/°C
-0.280 %/°C
Same
Mechanical
Dimensions
2382x1134x30 mm
2384x1303x33 mm
2382x1134x30 mm vs 2384x1303x33 mm
Module area
2.701 m²
3.106 m²
0.405 m² apart
Weight
29.0 kg
37.0 kg
-8.0 kg for TWMNH-66HS
Weight per kWp
46.4 kg/kWp
50.0 kg/kWp
-3.6 kg/kWp for TWMNH-66HS
Warranty and degradation
Product warranty
15 yrs
15 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
-
-
Neither datasheet publishes this
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
#1,509
vs
#433
THC G12-66 Bifacial leads by 1,076 places
Power density
#1,513
vs
#431
THC G12-66 Bifacial leads by 1,082 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#1,141
vs
#3,317
TWMNH-66HS leads by 2,176 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,789
vs
#130
THC G12-66 Bifacial leads by 1,659 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 TWMNH-66HS or Tongwei THC G12-66 Bifacial?
According to our database: Tongwei THC G12-66 Bifacial has higher module efficiency (23.80% vs 23.14%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TWMNH-66HS and Tongwei THC G12-66 Bifacial?
Tongwei TWMNH-66HS has a module efficiency of 23.14%, 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 TWMNH-66HS use vs Tongwei THC G12-66 Bifacial?
Tongwei TWMNH-66HS 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 TWMNH-66HS and Tongwei THC G12-66 Bifacial?
Tongwei TWMNH-66HS 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 TWMNH-66HS and Tongwei THC G12-66 Bifacial bifacial panels?
Both Tongwei TWMNH-66HS 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.