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GK-4-78HGBD-780M vs AIKO-A785-GRH78Dw 17 of 18 identical Swap Change panels

Gokin GK-4-78HGBD-780M vs AIKO AIKO-A785-GRH78Dw

Gokin GK-4-78HGBD-780M
Gokin
GK-4-78HGBD-780M
780 Wp 24.30 % Back Contact Bifacial
Open panel page Datasheet PDF
VS
AIKO AIKO-A785-GRH78Dw
AIKO-A785-GRH78Dw
785 Wp 24.40 % Back Contact Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

GK-4-78HGBD-780M 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-780M AIKO-A785-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-780M
26,171 kWh
AIKO-A785-GRH78Dw
26,338 kWh
Lifetime gap
167 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario GK-4-78HGBD-780M AIKO-A785-GRH78Dw
Standard test conditions 25 °C 100.0% of rated power 780 W 785 W
Cool, bright day 40 °C 96.1% of rated power 750 W 754 W
Typical summer roof 55 °C 92.2% of rated power 719 W 724 W
Hot roof 70 °C 88.3% of rated power 689 W 693 W
03

Full specification

Parameter GK-4-78HGBD-780M AIKO-A785-GRH78Dw Difference
Power and efficiency
Rated power 780 Wp 785 Wp Effectively the same
Module efficiency 24.30 % 24.40 % Effectively the same
Power density 242.8 Wp/m² 244.4 Wp/m² Effectively the same
Open-circuit voltage 58.92 V 59.02 V Effectively the same
Voltage at max power 48.97 V 49.07 V Effectively the same
Short-circuit current 16.78 A 16.85 A Effectively the same
Current at max power 15.93 A 16.00 A Effectively the 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-780M
Weight per kWp 49.6 kg/kWp 50.7 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
#131 vs #99
AIKO-A785-GRH78Dw leads by 32 places
Power density
#138 vs #87
AIKO-A785-GRH78Dw leads by 51 places
Heat behaviour
#511 vs #511
Tied - the same position in the database
Weight
#3,161 vs #4,120
GK-4-78HGBD-780M leads by 959 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#15 vs #10
AIKO-A785-GRH78Dw leads by 5 places
05

More useful comparisons

Open the full database
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Gokin
Gokin GK-4-78HGBD-780M vs Gokin GK-4-78HGBD-775M
One difference: module efficiency
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Gokin GK-4-78HGBD-780M vs Gokin GK-4-78HGBD-770M
3 differences, the largest is module efficiency
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Gokin GK-4-78HGBD-780M vs Gokin GK-4-78HGBD-765M
3 differences, the largest is module efficiency
Same series, other bin
Gokin
Gokin GK-4-78HGBD-780M vs Gokin GK-4-78HGBD-760M
3 differences, the largest is module efficiency
Same series, other bin
AIKO AIKO-A785-GRH78Dw vs AIKO AIKO-A805-GRH78Dw
3 differences, the largest is module efficiency
Same series, other bin
AIKO AIKO-A785-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-780M or AIKO AIKO-A785-GRH78Dw?
According to our database: AIKO AIKO-A785-GRH78Dw has higher module efficiency (24.40% vs 24.30%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Gokin GK-4-78HGBD-780M and AIKO AIKO-A785-GRH78Dw?
Gokin GK-4-78HGBD-780M has a module efficiency of 24.30%, while AIKO AIKO-A785-GRH78Dw is 24.40%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Gokin GK-4-78HGBD-780M use vs AIKO AIKO-A785-GRH78Dw?
Gokin GK-4-78HGBD-780M uses Back Contact cells; AIKO AIKO-A785-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-780M and AIKO AIKO-A785-GRH78Dw?
Gokin GK-4-78HGBD-780M has a 30 years power warranty; AIKO AIKO-A785-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-780M and AIKO AIKO-A785-GRH78Dw bifacial panels?
Both Gokin GK-4-78HGBD-780M and AIKO AIKO-A785-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.