AIKO AIKO-A790-GRH78Dw vs AIKO AIKO-G665-MCH72Mw
VS
The verdict
11 differences, and they point both ways
The largest is rated power: 125 W more power. 7 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 11 differencesHow alike are they
7
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
11 of 18 parameters
What actually differs
Parameter
A790-GRH78Dw
G665-MCH72Mw
Difference
Rated power
790 Wp
665 Wp
125 W more power
Weight
39.8 kg
28.2 kg
11.6 kg lighter
Weight per kWp
50.4 kg/kWp
42.4 kg/kWp
8.0 kg/kWp lighter
Open-circuit voltage
59.12 V
54.70 V
4.42 V apart
Module area
3.212 m²
2.701 m²
0.511 m² apart
Short-circuit current
16.92 A
15.30 A
1.62 A apart
Cell count
156
144
12 cells apart
Voltage at max power
49.17 V
45.40 V
3.77 V apart
Bifacial
Yes
No
Yes vs No
Current at max power
16.07 A
14.65 A
1.42 A apart
Dimensions
2465x1303x33 mm
2382x1134x33 mm
2465x1303x33 mm vs 2382x1134x33 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
Same temp coeff. for both panels (-0.260 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
A790-GRH78Dw
26,506 kWh
G665-MCH72Mw
22,312 kWh
Lifetime gap
4,194 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
A790-GRH78Dw
G665-MCH72Mw
Standard test conditions
25 °C
100.0% of rated power
790 W
665 W
Cool, bright day
40 °C
96.1% of rated power
759 W
639 W
Typical summer roof
55 °C
92.2% of rated power
728 W
613 W
Hot roof
70 °C
88.3% of rated power
698 W
587 W
03
Full specification
Parameter
A790-GRH78Dw
G665-MCH72Mw
Difference
Power and efficiency
Rated power
790 Wp
665 Wp
+125 W for A790-GRH78Dw
Module efficiency
24.60 %
24.60 %
Same
Power density
246.0 Wp/m²
246.2 Wp/m²
Effectively the same
Open-circuit voltage
59.12 V
54.70 V
4.42 V apart
Voltage at max power
49.17 V
45.40 V
3.77 V apart
Short-circuit current
16.92 A
15.30 A
1.62 A apart
Current at max power
16.07 A
14.65 A
1.42 A apart
Temperature
Temperature coefficient
-0.260 %/°C
-0.260 %/°C
Same
Mechanical
Dimensions
2465x1303x33 mm
2382x1134x33 mm
2465x1303x33 mm vs 2382x1134x33 mm
Module area
3.212 m²
2.701 m²
0.511 m² apart
Weight
39.8 kg
28.2 kg
-11.6 kg for G665-MCH72Mw
Weight per kWp
50.4 kg/kWp
42.4 kg/kWp
-8.0 kg/kWp for G665-MCH72Mw
Warranty and degradation
Product warranty
15 yrs
15 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
-
0.35 %/yr
Not published by AIKO
Technology
Cell technology
Back Contact
Back Contact
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
156
144
12 cells apart
Bifacial
Yes
No
Yes vs No
04
14,005 panels
Against the whole database
Efficiency
#51
vs
#51
Tied - the same position in the database
Power density
#69
vs
#42
G665-MCH72Mw leads by 27 places
Heat behaviour
#511
vs
#511
Tied - the same position in the database
Weight
#3,756
vs
#217
G665-MCH72Mw leads by 3,539 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#6
vs
#381
A790-GRH78Dw leads by 375 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: AIKO AIKO-A790-GRH78Dw or AIKO AIKO-G665-MCH72Mw?
According to our database: both panels are closely matched on key specs - the decision often comes down to price and local availability. See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of AIKO AIKO-A790-GRH78Dw and AIKO AIKO-G665-MCH72Mw?
AIKO AIKO-A790-GRH78Dw has a module efficiency of 24.60%, while AIKO AIKO-G665-MCH72Mw is 24.60%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does AIKO AIKO-A790-GRH78Dw use vs AIKO AIKO-G665-MCH72Mw?
AIKO AIKO-A790-GRH78Dw uses Back Contact cells; AIKO AIKO-G665-MCH72Mw 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 AIKO AIKO-A790-GRH78Dw and AIKO AIKO-G665-MCH72Mw?
AIKO AIKO-A790-GRH78Dw has a 30 years power warranty; AIKO AIKO-G665-MCH72Mw 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 AIKO AIKO-A790-GRH78Dw and AIKO AIKO-G665-MCH72Mw bifacial panels?
AIKO AIKO-A790-GRH78Dw is bifacial (captures light from both faces); AIKO AIKO-G665-MCH72Mw is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Shop prices: See 180 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.