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GK-4-78HGBD-775M vs AIKO-A775-GRH78Dw 17 of 18 identical Swap Change panels

Gokin GK-4-78HGBD-775M vs AIKO AIKO-A775-GRH78Dw

Gokin GK-4-78HGBD-775M
Gokin
GK-4-78HGBD-775M
775 Wp 24.10 % Back Contact Bifacial
Open panel page Datasheet PDF
VS
AIKO AIKO-A775-GRH78Dw
AIKO-A775-GRH78Dw
775 Wp 24.10 % Back Contact Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

GK-4-78HGBD-775M leads on the differences that matter

The largest is weight: 1.1 kg lighter. 17 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See the one difference
How alike are they
17 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

1 of 18 parameters
Parameter GK-4-78HGBD-775M AIKO-A775-GRH78Dw Difference
Weight 38.7 kg 39.8 kg 1.1 kg lighter
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.
GK-4-78HGBD-775M
26,003 kWh
AIKO-A775-GRH78Dw
26,003 kWh
Lifetime gap
No difference
Output when it is hot
Rated power carried across the range a module actually sees
Scenario GK-4-78HGBD-775M AIKO-A775-GRH78Dw
Standard test conditions 25 °C 100.0% of rated power 775 W 775 W
Cool, bright day 40 °C 96.1% of rated power 745 W 745 W
Typical summer roof 55 °C 92.2% of rated power 715 W 715 W
Hot roof 70 °C 88.3% of rated power 684 W 684 W
03

Full specification

Parameter GK-4-78HGBD-775M AIKO-A775-GRH78Dw Difference
Power and efficiency
Rated power 775 Wp 775 Wp Same
Module efficiency 24.10 % 24.10 % Same
Power density 241.3 Wp/m² 241.3 Wp/m² Same
Open-circuit voltage 58.82 V 58.82 V Same
Voltage at max power 48.87 V 48.87 V Same
Short-circuit current 16.71 A 16.71 A Same
Current at max power 15.86 A 15.86 A Same
Temperature
Temperature coefficient -0.260 %/°C -0.260 %/°C Same
Mechanical
Dimensions 2465x1303x33 mm 2465x1303x33 mm Same
Module area 3.212 m² 3.212 m² Same
Weight 38.7 kg 39.8 kg -1.1 kg for GK-4-78HGBD-775M
Weight per kWp 49.9 kg/kWp 51.4 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 156 156 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#219 vs #219
Tied - the same position in the database
Power density
#227 vs #227
Tied - the same position in the database
Heat behaviour
#511 vs #511
Tied - the same position in the database
Weight
#3,297 vs #4,724
GK-4-78HGBD-775M leads by 1,427 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#29 vs #30
GK-4-78HGBD-775M leads by 1 place
05

More useful comparisons

Open the full database
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Gokin GK-4-78HGBD-775M vs Gokin GK-4-78HGBD-780M
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Gokin GK-4-78HGBD-775M vs Gokin GK-4-78HGBD-770M
The same specification on paper
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Gokin GK-4-78HGBD-775M vs Gokin GK-4-78HGBD-765M
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Gokin GK-4-78HGBD-775M vs Gokin GK-4-78HGBD-760M
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Same series, other bin
AIKO AIKO-A775-GRH78Dw vs AIKO AIKO-A805-GRH78Dw
3 differences, the largest is module efficiency
Same series, other bin
AIKO AIKO-A775-GRH78Dw vs AIKO AIKO-A800-GRH78Dw
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Gokin GK-4-78HGBD-775M or AIKO AIKO-A775-GRH78Dw?
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 Gokin GK-4-78HGBD-775M and AIKO AIKO-A775-GRH78Dw?
Gokin GK-4-78HGBD-775M has a module efficiency of 24.10%, while AIKO AIKO-A775-GRH78Dw is 24.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Gokin GK-4-78HGBD-775M use vs AIKO AIKO-A775-GRH78Dw?
Gokin GK-4-78HGBD-775M uses Back Contact cells; AIKO AIKO-A775-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 Gokin GK-4-78HGBD-775M and AIKO AIKO-A775-GRH78Dw?
Gokin GK-4-78HGBD-775M has a 30 years power warranty; AIKO AIKO-A775-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 Gokin GK-4-78HGBD-775M and AIKO AIKO-A775-GRH78Dw bifacial panels?
Both Gokin GK-4-78HGBD-775M and AIKO AIKO-A775-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.
Compare Gokin and AIKO as manufacturers Portfolio, efficiency, cell technologies and warranty terms

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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.