Tongwei TWMNH-66HD620 vs Tongwei TWMNF-66HD740
VS
The verdict
TWMNF-66HD740 leads on the differences that matter
The largest is module efficiency: 0.80 pp more efficient. 10 of 19 comparable parameters are identical.
See all 9 differencesHow alike are they
10
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
9 of 19 parameters
What actually differs
Parameter
TWMNH-66HD620
TWMNF-66HD740
Difference
Module efficiency
23.00 %
23.80 %
0.80 pp more efficient
Rated power
620 Wp
740 Wp
120 W more power
Weight
32.5 kg
37.3 kg
4.8 kg lighter
Power density
229.5 Wp/m²
238.2 Wp/m²
8.7 Wp/m² higher
Short-circuit current
16.06 A
18.81 A
2.75 A apart
Module area
2.701 m²
3.106 m²
0.405 m² apart
Current at max power
15.19 A
17.75 A
2.56 A apart
Weight per kWp
52.4 kg/kWp
50.4 kg/kWp
2.0 kg/kWp lighter
Dimensions
2382x1134x30 mm
2384x1303x33 mm
2382x1134x30 mm vs 2384x1303x33 mm
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
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-66HD620
20,802 kWh
TWMNF-66HD740
24,828 kWh
Lifetime gap
4,026 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
TWMNH-66HD620
TWMNF-66HD740
Standard test conditions
25 °C
100.0% of rated power
620 W
740 W
Cool, bright day
40 °C
95.8% of rated power
594 W
709 W
Typical summer roof
55 °C
91.6% of rated power
568 W
678 W
Hot roof
70 °C
87.4% of rated power
542 W
647 W
03
Full specification
Parameter
TWMNH-66HD620
TWMNF-66HD740
Difference
Power and efficiency
Rated power
620 Wp
740 Wp
+120 W for TWMNF-66HD740
Module efficiency
23.00 %
23.80 %
+0.80 pp for TWMNF-66HD740
Power density
229.5 Wp/m²
238.2 Wp/m²
+8.7 Wp/m² for TWMNF-66HD740
Open-circuit voltage
49.10 V
49.80 V
Effectively the same
Voltage at max power
40.82 V
41.69 V
Effectively the same
Short-circuit current
16.06 A
18.81 A
2.75 A apart
Current at max power
15.19 A
17.75 A
2.56 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
32.5 kg
37.3 kg
-4.8 kg for TWMNH-66HD620
Weight per kWp
52.4 kg/kWp
50.4 kg/kWp
-2.0 kg/kWp for TWMNF-66HD740
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.40 %/yr
0.40 %/yr
Same
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
#1,919
vs
#433
TWMNF-66HD740 leads by 1,486 places
Power density
#2,191
vs
#431
TWMNF-66HD740 leads by 1,760 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#5,893
vs
#3,784
TWMNF-66HD740 leads by 2,109 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#2,525
vs
#183
TWMNF-66HD740 leads by 2,342 places
05
Open the full database
More useful comparisons
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Tongwei TWMNH-66HD620 vs Tongwei TWMHF-66HD740X
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Tongwei TWMNH-66HD620 vs Tongwei TWMHF-66HD735X
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Tongwei TWMNH-66HD620 vs Tongwei TWMHF-66HD730X
13 differences, the largest is temperature coefficient
06
Written summary
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07
Questions about this pairing
Which panel is better: Tongwei TWMNH-66HD620 or Tongwei TWMNF-66HD740?
According to our database: Tongwei TWMNF-66HD740 has higher module efficiency (23.80% vs 23.00%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TWMNH-66HD620 and Tongwei TWMNF-66HD740?
Tongwei TWMNH-66HD620 has a module efficiency of 23.00%, while Tongwei TWMNF-66HD740 is 23.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TWMNH-66HD620 use vs Tongwei TWMNF-66HD740?
Tongwei TWMNH-66HD620 uses TOPCon cells; Tongwei TWMNF-66HD740 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-66HD620 and Tongwei TWMNF-66HD740?
Tongwei TWMNH-66HD620 has a 30 years power warranty; Tongwei TWMNF-66HD740 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-66HD620 and Tongwei TWMNF-66HD740 bifacial panels?
Both Tongwei TWMNH-66HD620 and Tongwei TWMNF-66HD740 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 59 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.