Tongwei TWMNF-66HD710XX vs Tongwei TWMNF-66HD720XX
VS
The verdict
66HD720XX leads on the differences that matter
The largest is module efficiency: 0.30 pp more efficient. 15 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 3 differencesHow alike are they
15
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
3 of 18 parameters
What actually differs
Parameter
66HD710XX
66HD720XX
Difference
Module efficiency
22.90 %
23.20 %
0.30 pp more efficient
Power density
228.6 Wp/m²
231.8 Wp/m²
3.2 Wp/m² higher
Rated power
710 Wp
720 Wp
10 W more power
02
What it means on a roof
Thirty years of production
Declared first-year losses, with 0.40% a year afterwards 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.
66HD710XX
23,822 kWh
66HD720XX
24,157 kWh
Lifetime gap
335 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
66HD710XX
66HD720XX
Standard test conditions
25 °C
100.0% of rated power
710 W
720 W
Cool, bright day
40 °C
95.8% of rated power
680 W
690 W
Typical summer roof
55 °C
91.6% of rated power
650 W
660 W
Hot roof
70 °C
87.4% of rated power
621 W
629 W
03
Full specification
Parameter
66HD710XX
66HD720XX
Difference
Power and efficiency
Rated power
710 Wp
720 Wp
+10 W for 66HD720XX
Module efficiency
22.90 %
23.20 %
+0.30 pp for 66HD720XX
Power density
228.6 Wp/m²
231.8 Wp/m²
+3.2 Wp/m² for 66HD720XX
Open-circuit voltage
48.94 V
49.28 V
Effectively the same
Voltage at max power
40.69 V
41.03 V
Effectively the same
Short-circuit current
18.59 A
18.55 A
Effectively the same
Current at max power
17.64 A
17.55 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
37.9 kg
37.9 kg
Same
Weight per kWp
53.4 kg/kWp
52.6 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
-
-
Neither datasheet publishes this
Technology
Cell technology
N-type
N-type
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
132
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#2,359
vs
#1,306
66HD720XX leads by 1,053 places
Power density
#2,474
vs
#1,347
66HD720XX leads by 1,127 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#7,271
vs
#6,266
66HD720XX leads by 1,005 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#817
vs
#516
66HD720XX leads by 301 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-66HD710XX or Tongwei TWMNF-66HD720XX?
According to our database: Tongwei TWMNF-66HD720XX has higher module efficiency (23.20% vs 22.90%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TWMNF-66HD710XX and Tongwei TWMNF-66HD720XX?
Tongwei TWMNF-66HD710XX has a module efficiency of 22.90%, while Tongwei TWMNF-66HD720XX is 23.20%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TWMNF-66HD710XX use vs Tongwei TWMNF-66HD720XX?
Tongwei TWMNF-66HD710XX uses N-type cells; Tongwei TWMNF-66HD720XX uses N-type. 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-66HD710XX and Tongwei TWMNF-66HD720XX?
Tongwei TWMNF-66HD710XX has a 30 years power warranty; Tongwei TWMNF-66HD720XX 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-66HD710XX and Tongwei TWMNF-66HD720XX bifacial panels?
Both Tongwei TWMNF-66HD710XX and Tongwei TWMNF-66HD720XX 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.