Tongwei TWMHF-66HD740X vs Tongwei TWMNH-66HD615
VS
The verdict
TWMHF-66HD740X leads on the differences that matter
The largest is module efficiency: 1.00 pp more efficient. 5 of 19 comparable parameters are identical.
See all 14 differencesHow alike are they
5
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
14 of 19 parameters
What actually differs
Parameter
TWMHF-66HD740X
TWMNH-66HD615
Difference
Module efficiency
23.80 %
22.80 %
1.00 pp more efficient
Temperature coefficient
-0.240 %/°C
-0.280 %/°C
0.040 %/°C better in heat
Rated power
740 Wp
615 Wp
125 W more power
Power density
238.2 Wp/m²
227.7 Wp/m²
10.5 Wp/m² higher
Weight
37.0 kg
32.5 kg
4.5 kg lighter
Product warranty
15 yrs
12 yrs
3 yrs longer
Short-circuit current
18.47 A
16.00 A
2.47 A apart
Module area
3.106 m²
2.701 m²
0.405 m² apart
Cell technology
N-type
TOPCon
N-type vs TOPCon
Weight per kWp
50.0 kg/kWp
52.8 kg/kWp
2.8 kg/kWp lighter
Current at max power
17.49 A
15.13 A
2.36 A apart
Open-circuit voltage
50.62 V
48.90 V
1.72 V apart
Dimensions
2384x1303x33 mm
2382x1134x30 mm
2384x1303x33 mm vs 2382x1134x30 mm
Voltage at max power
42.32 V
40.65 V
1.67 V apart
02
What it means on a roof
Thirty years of production
Each panel's own declared degradation curve, at 1,200 kWh/kWp a year
TWMHF-66HD740X
24,925 kWh
TWMNH-66HD615
20,634 kWh
Lifetime gap
4,291 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
TWMHF-66HD740X
TWMNH-66HD615
Standard test conditions
25 °C
100.0% of rated power
740 W
615 W
Cool, bright day
40 °C
95.8% of rated power
713 W
589 W
Typical summer roof
55 °C
91.6% of rated power
687 W
563 W
Hot roof
70 °C
87.4% of rated power
660 W
538 W
03
Full specification
Parameter
TWMHF-66HD740X
TWMNH-66HD615
Difference
Power and efficiency
Rated power
740 Wp
615 Wp
+125 W for TWMHF-66HD740X
Module efficiency
23.80 %
22.80 %
+1.00 pp for TWMHF-66HD740X
Power density
238.2 Wp/m²
227.7 Wp/m²
+10.5 Wp/m² for TWMHF-66HD740X
Open-circuit voltage
50.62 V
48.90 V
1.72 V apart
Voltage at max power
42.32 V
40.65 V
1.67 V apart
Short-circuit current
18.47 A
16.00 A
2.47 A apart
Current at max power
17.49 A
15.13 A
2.36 A apart
Temperature
Temperature coefficient
-0.240 %/°C
-0.280 %/°C
+0.040 %/°C for TWMHF-66HD740X
Mechanical
Dimensions
2384x1303x33 mm
2382x1134x30 mm
2384x1303x33 mm vs 2382x1134x30 mm
Module area
3.106 m²
2.701 m²
0.405 m² apart
Weight
37.0 kg
32.5 kg
-4.5 kg for TWMNH-66HD615
Weight per kWp
50.0 kg/kWp
52.8 kg/kWp
-2.8 kg/kWp for TWMHF-66HD740X
Warranty and degradation
Product warranty
15 yrs
12 yrs
+3 yrs for TWMHF-66HD740X
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.38 %/yr
0.40 %/yr
Effectively the same
Technology
Cell technology
N-type
TOPCon
N-type vs TOPCon
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
#2,714
TWMHF-66HD740X leads by 2,281 places
Power density
#431
vs
#3,077
TWMHF-66HD740X leads by 2,646 places
Heat behaviour
#13
vs
#1,309
TWMHF-66HD740X leads by 1,296 places
Weight
#3,317
vs
#6,546
TWMHF-66HD740X leads by 3,229 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#130
vs
#2,879
TWMHF-66HD740X leads by 2,749 places
05
Open the full database
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Tongwei TWMNH-66HD615 vs Tongwei TWMNF-66HD750
11 differences, the largest is module efficiency
06
Written summary
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07
Questions about this pairing
Which panel is better: Tongwei TWMHF-66HD740X or Tongwei TWMNH-66HD615?
According to our database: Tongwei TWMHF-66HD740X has higher module efficiency (23.80% vs 22.80%); Tongwei TWMHF-66HD740X tolerates heat better (temp coeff -0.240%/°C vs -0.280%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TWMHF-66HD740X and Tongwei TWMNH-66HD615?
Tongwei TWMHF-66HD740X has a module efficiency of 23.80%, while Tongwei TWMNH-66HD615 is 22.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TWMHF-66HD740X use vs Tongwei TWMNH-66HD615?
Tongwei TWMHF-66HD740X uses N-type cells; Tongwei TWMNH-66HD615 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 TWMHF-66HD740X and Tongwei TWMNH-66HD615?
Tongwei TWMHF-66HD740X has a 30 years power warranty; Tongwei TWMNH-66HD615 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 TWMHF-66HD740X and Tongwei TWMNH-66HD615 bifacial panels?
Both Tongwei TWMHF-66HD740X and Tongwei TWMNH-66HD615 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.
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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.