Tongwei TWMNF-66HD vs Tongwei TWMNF-66HD750
VS
The verdict
66HD750 leads on the differences that matter
The largest is module efficiency: 1.10 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
66HD
66HD750
Difference
Module efficiency
23.00 %
24.10 %
1.10 pp more efficient
Power density
230.2 Wp/m²
241.4 Wp/m²
11.3 Wp/m² higher
Rated power
715 Wp
750 Wp
35 W more power
Product warranty
15 yrs
12 yrs
3 yrs longer
Weight per kWp
53.0 kg/kWp
49.7 kg/kWp
3.3 kg/kWp lighter
Voltage at max power
40.86 V
42.02 V
1.16 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.
66HD
23,990 kWh
66HD750
25,164 kWh
Lifetime gap
1,174 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
66HD
66HD750
Standard test conditions
25 °C
100.0% of rated power
715 W
750 W
Cool, bright day
40 °C
95.8% of rated power
685 W
719 W
Typical summer roof
55 °C
91.6% of rated power
655 W
687 W
Hot roof
70 °C
87.4% of rated power
625 W
656 W
03
Full specification
Parameter
66HD
66HD750
Difference
Power and efficiency
Rated power
715 Wp
750 Wp
+35 W for 66HD750
Module efficiency
23.00 %
24.10 %
+1.10 pp for 66HD750
Power density
230.2 Wp/m²
241.4 Wp/m²
+11.3 Wp/m² for 66HD750
Open-circuit voltage
49.11 V
50.10 V
Effectively the same
Voltage at max power
40.86 V
42.02 V
1.16 V apart
Short-circuit current
18.50 A
18.93 A
Effectively the same
Current at max power
17.50 A
17.85 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
37.3 kg
Effectively the same
Weight per kWp
53.0 kg/kWp
49.7 kg/kWp
-3.3 kg/kWp for 66HD750
Warranty and degradation
Product warranty
15 yrs
12 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
#1,919
vs
#219
66HD750 leads by 1,700 places
Power density
#2,018
vs
#219
66HD750 leads by 1,799 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#6,744
vs
#3,210
66HD750 leads by 3,534 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#450
vs
#122
66HD750 leads by 328 places
05
Open the full database
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The same specification on paper
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: Tongwei TWMNF-66HD or Tongwei TWMNF-66HD750?
According to our database: Tongwei TWMNF-66HD750 has higher module efficiency (24.10% 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-66HD and Tongwei TWMNF-66HD750?
Tongwei TWMNF-66HD has a module efficiency of 23.00%, while Tongwei TWMNF-66HD750 is 24.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TWMNF-66HD use vs Tongwei TWMNF-66HD750?
Tongwei TWMNF-66HD uses TOPCon cells; Tongwei TWMNF-66HD750 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-66HD and Tongwei TWMNF-66HD750?
Tongwei TWMNF-66HD has a 30 years power warranty; Tongwei TWMNF-66HD750 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-66HD and Tongwei TWMNF-66HD750 bifacial panels?
Both Tongwei TWMNF-66HD and Tongwei TWMNF-66HD750 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.