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A655-GRH66Dw vs G660-MCH72Dw 12 of 19 identical Swap Change panels

AIKO AIKO-A655-GRH66Dw vs AIKO AIKO-G660-MCH72Dw

AIKO AIKO-A655-GRH66Dw
AIKO-A655-GRH66Dw
655 Wp 24.20 % Back Contact Bifacial
Open panel page Datasheet PDF
VS
AIKO AIKO-G660-MCH72Dw
AIKO-G660-MCH72Dw
660 Wp 24.40 % Back Contact Bifacial
Open panel page Datasheet PDF
The verdict

G660-MCH72Dw leads on the differences that matter

The largest is open-circuit voltage: 4.80 V apart. 12 of 19 comparable parameters are identical.

See all 7 differences
How alike are they
12 of 19 comparable
parameters are identical
identical differs
01

What actually differs

7 of 19 parameters
Parameter A655-GRH66Dw G660-MCH72Dw Difference
Open-circuit voltage 49.40 V 54.20 V 4.80 V apart
Short-circuit current 16.69 A 15.18 A 1.51 A apart
Module efficiency 24.20 % 24.40 % 0.20 pp more efficient
Cell count 132 144 12 cells apart
Voltage at max power 42.10 V 45.50 V 3.40 V apart
Weight 32.5 kg 33.5 kg 1.0 kg lighter
Current at max power 15.56 A 14.51 A 1.05 A apart
02

What it means on a roof

Thirty years of production
Each panel's own declared degradation curve, 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.
A655-GRH66Dw
22,148 kWh
G660-MCH72Dw
22,317 kWh
Lifetime gap
169 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario A655-GRH66Dw G660-MCH72Dw
Standard test conditions 25 °C 100.0% of rated power 655 W 660 W
Cool, bright day 40 °C 96.1% of rated power 629 W 634 W
Typical summer roof 55 °C 92.2% of rated power 604 W 609 W
Hot roof 70 °C 88.3% of rated power 578 W 583 W
03

Full specification

Parameter A655-GRH66Dw G660-MCH72Dw Difference
Power and efficiency
Rated power 655 Wp 660 Wp Effectively the same
Module efficiency 24.20 % 24.40 % +0.20 pp for G660-MCH72Dw
Power density 242.5 Wp/m² 244.3 Wp/m² Effectively the same
Open-circuit voltage 49.40 V 54.20 V 4.80 V apart
Voltage at max power 42.10 V 45.50 V 3.40 V apart
Short-circuit current 16.69 A 15.18 A 1.51 A apart
Current at max power 15.56 A 14.51 A 1.05 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.260 %/°C Same
Mechanical
Dimensions 2382x1134x30 mm 2382x1134x30 mm Same
Module area 2.701 m² 2.701 m² Same
Weight 32.5 kg 33.5 kg -1.0 kg for A655-GRH66Dw
Weight per kWp 49.6 kg/kWp 50.8 kg/kWp Effectively the same
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.35 %/yr 0.35 %/yr Same
Technology
Cell technology Back Contact Back Contact Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 144 12 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#184 vs #99
G660-MCH72Dw leads by 85 places
Power density
#172 vs #88
G660-MCH72Dw leads by 84 places
Heat behaviour
#511 vs #511
Tied - the same position in the database
Weight
#3,162 vs #4,172
A655-GRH66Dw leads by 1,010 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#738 vs #576
G660-MCH72Dw leads by 162 places
05

More useful comparisons

Open the full database
Same series, other bin
AIKO AIKO-A655-GRH66Dw vs AIKO AIKO-A660-GRH66Dw
One difference: module efficiency
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AIKO AIKO-A655-GRH66Dw vs AIKO AIKO-A650-GRH66Dw
The same specification on paper
Same series, other bin
AIKO AIKO-A655-GRH66Dw vs AIKO AIKO-A645-GRH66Dw
3 differences, the largest is module efficiency
Same series, other bin
AIKO AIKO-A655-GRH66Dw vs AIKO AIKO-A640-GRH66Dw
3 differences, the largest is module efficiency
Same series, other bin
AIKO AIKO-G660-MCH72Dw vs AIKO AIKO-G655-MCH72Dw
One difference: module efficiency
Same series, other bin
AIKO AIKO-G660-MCH72Dw vs AIKO AIKO-G650-MCH72Dw
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: AIKO AIKO-A655-GRH66Dw or AIKO AIKO-G660-MCH72Dw?
According to our database: AIKO AIKO-G660-MCH72Dw has higher module efficiency (24.40% vs 24.20%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of AIKO AIKO-A655-GRH66Dw and AIKO AIKO-G660-MCH72Dw?
AIKO AIKO-A655-GRH66Dw has a module efficiency of 24.20%, while AIKO AIKO-G660-MCH72Dw is 24.40%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does AIKO AIKO-A655-GRH66Dw use vs AIKO AIKO-G660-MCH72Dw?
AIKO AIKO-A655-GRH66Dw uses Back Contact cells; AIKO AIKO-G660-MCH72Dw 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-A655-GRH66Dw and AIKO AIKO-G660-MCH72Dw?
AIKO AIKO-A655-GRH66Dw has a 30 years power warranty; AIKO AIKO-G660-MCH72Dw 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-A655-GRH66Dw and AIKO AIKO-G660-MCH72Dw bifacial panels?
Both AIKO AIKO-A655-GRH66Dw and AIKO AIKO-G660-MCH72Dw 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.