AIKO AIKO-A620-MAE72Dw vs AIKO AIKO-A640-MAE72Dw
VS
The verdict
A640-MAE72Dw leads on the differences that matter
The largest is module efficiency: 0.80 pp more efficient. 16 of 19 comparable parameters are identical.
See all 3 differencesHow alike are they
16
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
3 of 19 parameters
What actually differs
Parameter
A620-MAE72Dw
A640-MAE72Dw
Difference
Module efficiency
24.00 %
24.80 %
0.80 pp more efficient
Power density
240.0 Wp/m²
247.7 Wp/m²
7.7 Wp/m² higher
Rated power
620 Wp
640 Wp
20 W more power
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.
A620-MAE72Dw
20,964 kWh
A640-MAE72Dw
21,640 kWh
Lifetime gap
676 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
A620-MAE72Dw
A640-MAE72Dw
Standard test conditions
25 °C
100.0% of rated power
620 W
640 W
Cool, bright day
40 °C
96.1% of rated power
596 W
615 W
Typical summer roof
55 °C
92.2% of rated power
572 W
590 W
Hot roof
70 °C
88.3% of rated power
547 W
565 W
03
Full specification
Parameter
A620-MAE72Dw
A640-MAE72Dw
Difference
Power and efficiency
Rated power
620 Wp
640 Wp
+20 W for A640-MAE72Dw
Module efficiency
24.00 %
24.80 %
+0.80 pp for A640-MAE72Dw
Power density
240.0 Wp/m²
247.7 Wp/m²
+7.7 Wp/m² for A640-MAE72Dw
Open-circuit voltage
54.57 V
55.09 V
Effectively the same
Voltage at max power
45.20 V
45.60 V
Effectively the same
Short-circuit current
14.46 A
14.78 A
Effectively the same
Current at max power
13.72 A
14.04 A
Effectively the same
Temperature
Temperature coefficient
-0.260 %/°C
-0.260 %/°C
Same
Mechanical
Dimensions
2278x1134x30 mm
2278x1134x30 mm
Same
Module area
2.583 m²
2.583 m²
Same
Weight
31.5 kg
31.5 kg
Same
Weight per kWp
50.8 kg/kWp
49.2 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
144
144
Same
Bifacial
No
No
Same
04
14,005 panels
Against the whole database
Efficiency
#303
vs
#12
A640-MAE72Dw leads by 291 places
Power density
#332
vs
#35
A640-MAE72Dw leads by 297 places
Heat behaviour
#511
vs
#511
Tied - the same position in the database
Weight
#4,216
vs
#2,805
A640-MAE72Dw leads by 1,411 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,432
vs
#647
A640-MAE72Dw leads by 785 places
05
Open the full database
More useful comparisons
Same series, other bin
AIKO AIKO-A620-MAE72Dw vs AIKO AIKO-A645-MAE72Dw
3 differences, the largest is module efficiency
Same series, other bin
AIKO AIKO-A620-MAE72Dw vs AIKO AIKO-A635-MAE72Dw
3 differences, the largest is module efficiency
Same series, other bin
AIKO AIKO-A620-MAE72Dw vs AIKO AIKO-A630-MAE72Dw
3 differences, the largest is module efficiency
Same series, other bin
AIKO AIKO-A620-MAE72Dw vs AIKO AIKO-A625-MAE72Dw
One difference: module efficiency
Same manufacturer
AIKO AIKO-A620-MAE72Dw vs AIKO AIKO-A805-GRH78Dw
12 differences, the largest is module efficiency
Same manufacturer
AIKO AIKO-A620-MAE72Dw vs AIKO AIKO-A800-GRH78Dw
12 differences, the largest is module efficiency
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: AIKO AIKO-A620-MAE72Dw or AIKO AIKO-A640-MAE72Dw?
According to our database: AIKO AIKO-A640-MAE72Dw has higher module efficiency (24.80% vs 24.00%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of AIKO AIKO-A620-MAE72Dw and AIKO AIKO-A640-MAE72Dw?
AIKO AIKO-A620-MAE72Dw has a module efficiency of 24.00%, while AIKO AIKO-A640-MAE72Dw is 24.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does AIKO AIKO-A620-MAE72Dw use vs AIKO AIKO-A640-MAE72Dw?
AIKO AIKO-A620-MAE72Dw uses Back Contact cells; AIKO AIKO-A640-MAE72Dw 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-A620-MAE72Dw and AIKO AIKO-A640-MAE72Dw?
AIKO AIKO-A620-MAE72Dw has a 30 years power warranty; AIKO AIKO-A640-MAE72Dw 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.
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.