Tongwei TWMNH-66HS vs Tongwei TNC M10-78 Bifacial
VS
The verdict
TWMNH-66HS leads on the differences that matter
The largest is weight: 4.8 kg lighter. 4 of 17 comparable parameters are identical, with 2 more left out because at least one datasheet does not publish them.
See all 13 differencesHow alike are they
4
of 17 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
13 of 17 parameters
What actually differs
Parameter
TWMNH-66HS
TNC M10-78 Bifacial
Difference
Weight
29.0 kg
33.8 kg
4.8 kg lighter
Module efficiency
23.14 %
22.70 %
0.44 pp more efficient
Weight per kWp
46.4 kg/kWp
53.2 kg/kWp
6.8 kg/kWp lighter
Product warranty
15 yrs
12 yrs
3 yrs longer
Open-circuit voltage
49.25 V
57.20 V
7.95 V apart
Short-circuit current
16.14 A
13.82 A
2.32 A apart
Module area
2.701 m²
2.795 m²
0.094 m² apart
Power density
231.4 Wp/m²
227.2 Wp/m²
4.2 Wp/m² higher
Rated power
625 Wp
635 Wp
10 W more power
Voltage at max power
40.77 V
48.05 V
7.28 V apart
Current at max power
15.33 A
13.22 A
2.11 A apart
Bifacial
Yes
No
Yes vs No
Dimensions
2382x1134x30 mm
2465x1134 mm
2382x1134x30 mm vs 2465x1134 mm
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
TNC M10-78 Bifacial
21,306 kWh
Lifetime gap
336 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
TWMNH-66HS
TNC M10-78 Bifacial
Standard test conditions
25 °C
100.0% of rated power
625 W
635 W
Cool, bright day
40 °C
95.8% of rated power
599 W
608 W
Typical summer roof
55 °C
91.6% of rated power
573 W
582 W
Hot roof
70 °C
87.4% of rated power
546 W
555 W
03
Full specification
Parameter
TWMNH-66HS
TNC M10-78 Bifacial
Difference
Power and efficiency
Rated power
625 Wp
635 Wp
+10 W for TNC M10-78 Bifacial
Module efficiency
23.14 %
22.70 %
+0.44 pp for TWMNH-66HS
Power density
231.4 Wp/m²
227.2 Wp/m²
+4.2 Wp/m² for TWMNH-66HS
Open-circuit voltage
49.25 V
57.20 V
7.95 V apart
Voltage at max power
40.77 V
48.05 V
7.28 V apart
Short-circuit current
16.14 A
13.82 A
2.32 A apart
Current at max power
15.33 A
13.22 A
2.11 A apart
Temperature
Temperature coefficient
-0.280 %/°C
-0.280 %/°C
Same
Mechanical
Dimensions
2382x1134x30 mm
2465x1134 mm
2382x1134x30 mm vs 2465x1134 mm
Module area
2.701 m²
2.795 m²
0.094 m² apart
Weight
29.0 kg
33.8 kg
-4.8 kg for TWMNH-66HS
Weight per kWp
46.4 kg/kWp
53.2 kg/kWp
-6.8 kg/kWp for TWMNH-66HS
Warranty and degradation
Product warranty
15 yrs
12 yrs
+3 yrs for TWMNH-66HS
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
-
Not published by Tongwei
Bifacial
Yes
No
Yes vs No
04
14,005 panels
Against the whole database
Efficiency
#1,509
vs
#3,307
TWMNH-66HS leads by 1,798 places
Power density
#1,513
vs
#3,252
TWMNH-66HS leads by 1,739 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#1,141
vs
#7,071
TWMNH-66HS leads by 5,930 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,789
vs
#2,385
TWMNH-66HS leads by 596 places
05
Open the full database
More useful comparisons
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11 differences, the largest is module efficiency
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Tongwei TWMNH-66HS vs Tongwei TWMNF-66HD
7 differences, the largest is rated power
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Tongwei TWMNH-66HS vs Tongwei TWMNH-66HD
The same specification on paper
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Tongwei TWMNH-66HS vs Tongwei TWMNH-54HD
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Same series, other bin
Tongwei TWMNH-66HS vs Tongwei TWMNH-48HC
6 differences, the largest is module efficiency
Same series, other bin
Tongwei TNC M10-78 Bifacial vs Tongwei TNC G12-66 Monofacial
9 differences, the largest is rated power
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: Tongwei TWMNH-66HS or Tongwei TNC M10-78 Bifacial?
According to our database: Tongwei TWMNH-66HS has higher module efficiency (23.14% vs 22.70%). 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 TNC M10-78 Bifacial?
Tongwei TWMNH-66HS has a module efficiency of 23.14%, while Tongwei TNC M10-78 Bifacial is 22.70%. 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 TNC M10-78 Bifacial?
Tongwei TWMNH-66HS uses TOPCon cells; Tongwei TNC M10-78 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 TNC M10-78 Bifacial?
Tongwei TWMNH-66HS has a 30 years power warranty; Tongwei TNC M10-78 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 TNC M10-78 Bifacial bifacial panels?
Tongwei TWMNH-66HS is bifacial (captures light from both faces); Tongwei TNC M10-78 Bifacial is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Shop prices: See 72 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.