Tongwei TWMNF-66HD vs AIKO AIKO-A785-GRH78Dw
VS
The verdict
AIKO-A785-GRH78Dw leads on the differences that matter
The largest is module efficiency: 1.40 pp more efficient. 4 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 14 differencesHow alike are they
4
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
14 of 18 parameters
What actually differs
Parameter
TWMNF-66HD
AIKO-A785-GRH78Dw
Difference
Module efficiency
23.00 %
24.40 %
1.40 pp more efficient
Rated power
715 Wp
785 Wp
70 W more power
Power density
230.2 Wp/m²
244.4 Wp/m²
14.2 Wp/m² higher
Temperature coefficient
-0.280 %/°C
-0.260 %/°C
0.020 %/°C better in heat
Open-circuit voltage
49.11 V
59.02 V
9.91 V apart
Module area
3.106 m²
3.212 m²
0.106 m² apart
Short-circuit current
18.50 A
16.85 A
1.65 A apart
Weight
37.9 kg
39.8 kg
1.9 kg lighter
Cell technology
TOPCon
Back Contact
TOPCon vs Back Contact
Voltage at max power
40.86 V
49.07 V
8.21 V apart
Cell count
132
156
24 cells apart
Weight per kWp
53.0 kg/kWp
50.7 kg/kWp
2.3 kg/kWp lighter
Current at max power
17.50 A
16.00 A
1.50 A apart
Dimensions
2384x1303x33 mm
2465x1303x33 mm
2384x1303x33 mm vs 2465x1303x33 mm
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
TWMNF-66HD
23,990 kWh
AIKO-A785-GRH78Dw
26,338 kWh
Lifetime gap
2,348 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
TWMNF-66HD
AIKO-A785-GRH78Dw
Standard test conditions
25 °C
100.0% of rated power
715 W
785 W
Cool, bright day
40 °C
95.8% of rated power
685 W
754 W
Typical summer roof
55 °C
91.6% of rated power
655 W
724 W
Hot roof
70 °C
87.4% of rated power
625 W
693 W
03
Full specification
Parameter
TWMNF-66HD
AIKO-A785-GRH78Dw
Difference
Power and efficiency
Rated power
715 Wp
785 Wp
+70 W for AIKO-A785-GRH78Dw
Module efficiency
23.00 %
24.40 %
+1.40 pp for AIKO-A785-GRH78Dw
Power density
230.2 Wp/m²
244.4 Wp/m²
+14.2 Wp/m² for AIKO-A785-GRH78Dw
Open-circuit voltage
49.11 V
59.02 V
9.91 V apart
Voltage at max power
40.86 V
49.07 V
8.21 V apart
Short-circuit current
18.50 A
16.85 A
1.65 A apart
Current at max power
17.50 A
16.00 A
1.50 A apart
Temperature
Temperature coefficient
-0.280 %/°C
-0.260 %/°C
+0.020 %/°C for AIKO-A785-GRH78Dw
Mechanical
Dimensions
2384x1303x33 mm
2465x1303x33 mm
2384x1303x33 mm vs 2465x1303x33 mm
Module area
3.106 m²
3.212 m²
0.106 m² apart
Weight
37.9 kg
39.8 kg
-1.9 kg for TWMNF-66HD
Weight per kWp
53.0 kg/kWp
50.7 kg/kWp
-2.3 kg/kWp for AIKO-A785-GRH78Dw
Warranty and degradation
Product warranty
15 yrs
15 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
-
-
Neither datasheet publishes this
Technology
Cell technology
TOPCon
Back Contact
TOPCon vs Back Contact
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
156
24 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#1,919
vs
#99
AIKO-A785-GRH78Dw leads by 1,820 places
Power density
#2,018
vs
#87
AIKO-A785-GRH78Dw leads by 1,931 places
Heat behaviour
#1,309
vs
#511
AIKO-A785-GRH78Dw leads by 798 places
Weight
#6,744
vs
#4,120
AIKO-A785-GRH78Dw leads by 2,624 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#450
vs
#10
AIKO-A785-GRH78Dw leads by 440 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-66HD or AIKO AIKO-A785-GRH78Dw?
According to our database: AIKO AIKO-A785-GRH78Dw has higher module efficiency (24.40% vs 23.00%); AIKO AIKO-A785-GRH78Dw tolerates heat better (temp coeff -0.260%/°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 TWMNF-66HD and AIKO AIKO-A785-GRH78Dw?
Tongwei TWMNF-66HD has a module efficiency of 23.00%, while AIKO AIKO-A785-GRH78Dw is 24.40%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TWMNF-66HD use vs AIKO AIKO-A785-GRH78Dw?
Tongwei TWMNF-66HD uses TOPCon cells; AIKO AIKO-A785-GRH78Dw uses Back Contact. 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 AIKO AIKO-A785-GRH78Dw?
Tongwei TWMNF-66HD has a 30 years power warranty; AIKO AIKO-A785-GRH78Dw 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 AIKO AIKO-A785-GRH78Dw bifacial panels?
Both Tongwei TWMNF-66HD and AIKO AIKO-A785-GRH78Dw 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 72 Tongwei offers · See 171 AIKO 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.