Tongwei TWMNF-66HD745 vs Tongwei TWMNF-66HD
VS
The verdict
66HD745 leads on the differences that matter
The largest is module efficiency: 1.00 pp more efficient. 12 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 6 differencesHow alike are they
12
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
6 of 18 parameters
What actually differs
Parameter
66HD745
66HD
Difference
Module efficiency
24.00 %
23.00 %
1.00 pp more efficient
Power density
239.8 Wp/m²
230.2 Wp/m²
9.7 Wp/m² higher
Rated power
745 Wp
715 Wp
30 W more power
Product warranty
12 yrs
15 yrs
3 yrs longer
Weight per kWp
50.1 kg/kWp
53.0 kg/kWp
2.9 kg/kWp lighter
Voltage at max power
41.86 V
40.86 V
1.00 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.
66HD745
24,996 kWh
66HD
23,990 kWh
Lifetime gap
1,006 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
66HD745
66HD
Standard test conditions
25 °C
100.0% of rated power
745 W
715 W
Cool, bright day
40 °C
95.8% of rated power
714 W
685 W
Typical summer roof
55 °C
91.6% of rated power
682 W
655 W
Hot roof
70 °C
87.4% of rated power
651 W
625 W
03
Full specification
Parameter
66HD745
66HD
Difference
Power and efficiency
Rated power
745 Wp
715 Wp
+30 W for 66HD745
Module efficiency
24.00 %
23.00 %
+1.00 pp for 66HD745
Power density
239.8 Wp/m²
230.2 Wp/m²
+9.7 Wp/m² for 66HD745
Open-circuit voltage
49.95 V
49.11 V
Effectively the same
Voltage at max power
41.86 V
40.86 V
1.00 V apart
Short-circuit current
18.87 A
18.50 A
Effectively the same
Current at max power
17.80 A
17.50 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
37.3 kg
37.9 kg
Effectively the same
Weight per kWp
50.1 kg/kWp
53.0 kg/kWp
-2.9 kg/kWp for 66HD745
Warranty and degradation
Product warranty
12 yrs
15 yrs
+3 yrs for 66HD
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
132
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#303
vs
#1,919
66HD745 leads by 1,616 places
Power density
#339
vs
#2,018
66HD745 leads by 1,679 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#3,586
vs
#6,744
66HD745 leads by 3,158 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#148
vs
#450
66HD745 leads by 302 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-66HD745 or Tongwei TWMNF-66HD?
According to our database: Tongwei TWMNF-66HD745 has higher module efficiency (24.00% vs 23.00%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TWMNF-66HD745 and Tongwei TWMNF-66HD?
Tongwei TWMNF-66HD745 has a module efficiency of 24.00%, while Tongwei TWMNF-66HD is 23.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TWMNF-66HD745 use vs Tongwei TWMNF-66HD?
Tongwei TWMNF-66HD745 uses TOPCon cells; Tongwei TWMNF-66HD 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 TWMNF-66HD745 and Tongwei TWMNF-66HD?
Tongwei TWMNF-66HD745 has a 30 years power warranty; Tongwei TWMNF-66HD 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-66HD745 and Tongwei TWMNF-66HD bifacial panels?
Both Tongwei TWMNF-66HD745 and Tongwei TWMNF-66HD 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.