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A805-GRH78Dw vs A640-MAE72Dw 7 of 18 identical Swap Change panels

AIKO AIKO-A805-GRH78Dw vs AIKO AIKO-A640-MAE72Dw

AIKO AIKO-A805-GRH78Dw
AIKO-A805-GRH78Dw
805 Wp 25.10 % Back Contact Bifacial Incomplete
Open panel page Datasheet PDF
VS
AIKO AIKO-A640-MAE72Dw
AIKO-A640-MAE72Dw
640 Wp 24.80 % Back Contact
Open panel page Datasheet PDF
The verdict

A805-GRH78Dw leads on the differences that matter

The largest is rated power: 165 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 differences
How alike are they
7 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

11 of 18 parameters
Parameter A805-GRH78Dw A640-MAE72Dw Difference
Rated power 805 Wp 640 Wp 165 W more power
Weight 39.8 kg 31.5 kg 8.3 kg lighter
Open-circuit voltage 59.42 V 55.09 V 4.33 V apart
Short-circuit current 17.13 A 14.78 A 2.35 A apart
Module area 3.212 m² 2.583 m² 0.629 m² apart
Module efficiency 25.10 % 24.80 % 0.30 pp more efficient
Current at max power 16.28 A 14.04 A 2.24 A apart
Cell count 156 144 12 cells apart
Voltage at max power 49.46 V 45.60 V 3.86 V apart
Bifacial Yes No Yes vs No
Dimensions 2465x1303x33 mm 2278x1134x30 mm 2465x1303x33 mm vs 2278x1134x30 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.
A805-GRH78Dw
27,009 kWh
A640-MAE72Dw
21,473 kWh
Lifetime gap
5,536 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario A805-GRH78Dw A640-MAE72Dw
Standard test conditions 25 °C 100.0% of rated power 805 W 640 W
Cool, bright day 40 °C 96.1% of rated power 774 W 615 W
Typical summer roof 55 °C 92.2% of rated power 742 W 590 W
Hot roof 70 °C 88.3% of rated power 711 W 565 W
03

Full specification

Parameter A805-GRH78Dw A640-MAE72Dw Difference
Power and efficiency
Rated power 805 Wp 640 Wp +165 W for A805-GRH78Dw
Module efficiency 25.10 % 24.80 % +0.30 pp for A805-GRH78Dw
Power density 250.6 Wp/m² 247.7 Wp/m² Effectively the same
Open-circuit voltage 59.42 V 55.09 V 4.33 V apart
Voltage at max power 49.46 V 45.60 V 3.86 V apart
Short-circuit current 17.13 A 14.78 A 2.35 A apart
Current at max power 16.28 A 14.04 A 2.24 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.260 %/°C Same
Mechanical
Dimensions 2465x1303x33 mm 2278x1134x30 mm 2465x1303x33 mm vs 2278x1134x30 mm
Module area 3.212 m² 2.583 m² 0.629 m² apart
Weight 39.8 kg 31.5 kg -8.3 kg for A640-MAE72Dw
Weight per kWp 49.4 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 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

Against the whole database

14,005 panels
Efficiency
#3 vs #12
A805-GRH78Dw leads by 9 places
Power density
#3 vs #35
A805-GRH78Dw leads by 32 places
Heat behaviour
#511 vs #511
Tied - the same position in the database
Weight
#2,977 vs #2,805
A640-MAE72Dw leads by 172 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1 vs #647
A805-GRH78Dw leads by 646 places
05

More useful comparisons

Open the full database
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AIKO AIKO-A805-GRH78Dw vs AIKO AIKO-A795-GRH78Dw
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AIKO AIKO-A805-GRH78Dw vs AIKO AIKO-A790-GRH78Dw
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AIKO AIKO-A805-GRH78Dw vs AIKO AIKO-A785-GRH78Dw
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AIKO AIKO-A805-GRH78Dw vs AIKO AIKO-A780-GRH78Dw
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Same series, other bin
AIKO AIKO-A805-GRH78Dw vs AIKO AIKO-A775-GRH78Dw
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: AIKO AIKO-A805-GRH78Dw or AIKO AIKO-A640-MAE72Dw?
According to our database: AIKO AIKO-A805-GRH78Dw has higher module efficiency (25.10% vs 24.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of AIKO AIKO-A805-GRH78Dw and AIKO AIKO-A640-MAE72Dw?
AIKO AIKO-A805-GRH78Dw has a module efficiency of 25.10%, 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-A805-GRH78Dw use vs AIKO AIKO-A640-MAE72Dw?
AIKO AIKO-A805-GRH78Dw 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-A805-GRH78Dw and AIKO AIKO-A640-MAE72Dw?
AIKO AIKO-A805-GRH78Dw 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.
Are AIKO AIKO-A805-GRH78Dw and AIKO AIKO-A640-MAE72Dw bifacial panels?
AIKO AIKO-A805-GRH78Dw is bifacial (captures light from both faces); AIKO AIKO-A640-MAE72Dw 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.