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A650-GRH66Dw vs A790-GRH78Dw 8 of 18 identical Swap Change panels

AIKO AIKO-A650-GRH66Dw vs AIKO AIKO-A790-GRH78Dw

AIKO AIKO-A650-GRH66Dw
AIKO-A650-GRH66Dw
650 Wp 24.10 % Back Contact Bifacial
Open panel page Datasheet PDF
VS
AIKO AIKO-A790-GRH78Dw
AIKO-A790-GRH78Dw
790 Wp 24.60 % Back Contact Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

A790-GRH78Dw leads on the differences that matter

The largest is rated power: 140 W more power. 8 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 10 differences
How alike are they
8 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

10 of 18 parameters
Parameter A650-GRH66Dw A790-GRH78Dw Difference
Rated power 650 Wp 790 Wp 140 W more power
Module efficiency 24.10 % 24.60 % 0.50 pp more efficient
Weight 32.5 kg 39.8 kg 7.3 kg lighter
Open-circuit voltage 49.30 V 59.12 V 9.82 V apart
Module area 2.701 m² 3.212 m² 0.511 m² apart
Power density 240.6 Wp/m² 246.0 Wp/m² 5.3 Wp/m² higher
Voltage at max power 42.00 V 49.17 V 7.17 V apart
Cell count 132 156 24 cells apart
Dimensions 2382x1134x30 mm 2465x1303x33 mm 2382x1134x30 mm vs 2465x1303x33 mm
Current at max power 15.48 A 16.07 A 0.59 A apart
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.
A650-GRH66Dw
21,809 kWh
A790-GRH78Dw
26,506 kWh
Lifetime gap
4,697 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario A650-GRH66Dw A790-GRH78Dw
Standard test conditions 25 °C 100.0% of rated power 650 W 790 W
Cool, bright day 40 °C 96.1% of rated power 625 W 759 W
Typical summer roof 55 °C 92.2% of rated power 599 W 728 W
Hot roof 70 °C 88.3% of rated power 574 W 698 W
03

Full specification

Parameter A650-GRH66Dw A790-GRH78Dw Difference
Power and efficiency
Rated power 650 Wp 790 Wp +140 W for A790-GRH78Dw
Module efficiency 24.10 % 24.60 % +0.50 pp for A790-GRH78Dw
Power density 240.6 Wp/m² 246.0 Wp/m² +5.3 Wp/m² for A790-GRH78Dw
Open-circuit voltage 49.30 V 59.12 V 9.82 V apart
Voltage at max power 42.00 V 49.17 V 7.17 V apart
Short-circuit current 16.62 A 16.92 A Effectively the same
Current at max power 15.48 A 16.07 A 0.59 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.260 %/°C Same
Mechanical
Dimensions 2382x1134x30 mm 2465x1303x33 mm 2382x1134x30 mm vs 2465x1303x33 mm
Module area 2.701 m² 3.212 m² 0.511 m² apart
Weight 32.5 kg 39.8 kg -7.3 kg for A650-GRH66Dw
Weight per kWp 50.0 kg/kWp 50.4 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 132 156 24 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#219 vs #51
A790-GRH78Dw leads by 168 places
Power density
#233 vs #69
A790-GRH78Dw leads by 164 places
Heat behaviour
#511 vs #511
Tied - the same position in the database
Weight
#3,317 vs #3,756
A650-GRH66Dw leads by 439 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#884 vs #6
A790-GRH78Dw leads by 878 places
05

More useful comparisons

Open the full database
Same series, other bin
AIKO AIKO-A650-GRH66Dw vs AIKO AIKO-G660-MCH72Dw
9 differences, the largest is open-circuit voltage
Same series, other bin
AIKO AIKO-A650-GRH66Dw vs AIKO AIKO-A660-GRH66Dw
3 differences, the largest is module efficiency
Same series, other bin
AIKO AIKO-A650-GRH66Dw vs AIKO AIKO-A655-GRH66Dw
The same specification on paper
Same series, other bin
AIKO AIKO-A650-GRH66Dw vs AIKO AIKO-A645-GRH66Dw
One difference: module efficiency
Same series, other bin
AIKO AIKO-A650-GRH66Dw vs AIKO AIKO-A640-GRH66Dw
3 differences, the largest is module efficiency
Same series, other bin
AIKO AIKO-A790-GRH78Dw vs AIKO AIKO-A805-GRH78Dw
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: AIKO AIKO-A650-GRH66Dw or AIKO AIKO-A790-GRH78Dw?
According to our database: AIKO AIKO-A790-GRH78Dw has higher module efficiency (24.60% vs 24.10%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of AIKO AIKO-A650-GRH66Dw and AIKO AIKO-A790-GRH78Dw?
AIKO AIKO-A650-GRH66Dw has a module efficiency of 24.10%, while AIKO AIKO-A790-GRH78Dw is 24.60%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does AIKO AIKO-A650-GRH66Dw use vs AIKO AIKO-A790-GRH78Dw?
AIKO AIKO-A650-GRH66Dw uses Back Contact cells; AIKO AIKO-A790-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 AIKO AIKO-A650-GRH66Dw and AIKO AIKO-A790-GRH78Dw?
AIKO AIKO-A650-GRH66Dw has a 30 years power warranty; AIKO AIKO-A790-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 AIKO AIKO-A650-GRH66Dw and AIKO AIKO-A790-GRH78Dw bifacial panels?
Both AIKO AIKO-A650-GRH66Dw and AIKO AIKO-A790-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 179 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.