GK-4-78HGBD-780M vs GSD8K66H-735WT 6 of 19 identical Swap Change panels

Gokin GK-4-78HGBD-780M vs Sharp GSD8K66H-735WT

Q: Which panel is better: Gokin GK-4-78HGBD-780M or Sharp GSD8K66H-735WT?

According to our database: Gokin GK-4-78HGBD-780M has higher module efficiency (24.30% vs 23.66%). See the full spec comparison and 30-year energy simulation above for a complete picture.

Q: What is the efficiency of Gokin GK-4-78HGBD-780M and Sharp GSD8K66H-735WT?

Gokin GK-4-78HGBD-780M has a module efficiency of 24.30%, while Sharp GSD8K66H-735WT is 23.66%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does Gokin GK-4-78HGBD-780M use vs Sharp GSD8K66H-735WT?

Gokin GK-4-78HGBD-780M uses Back Contact cells; Sharp GSD8K66H-735WT uses HJT. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.

Q: What is the warranty on Gokin GK-4-78HGBD-780M and Sharp GSD8K66H-735WT?

Gokin GK-4-78HGBD-780M has a 30 years power warranty; Sharp GSD8K66H-735WT 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.

Q: Are Gokin GK-4-78HGBD-780M and Sharp GSD8K66H-735WT bifacial panels?

Both Gokin GK-4-78HGBD-780M and Sharp GSD8K66H-735WT 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.

Gokin

GK-4-78HGBD-780M

780 Wp 24.30 % Back Contact Bifacial

Open panel page Datasheet PDF

Sharp

GSD8K66H-735WT

735 Wp 23.66 % HJT Bifacial

Open panel page Datasheet PDF

The verdict

GK-4-78HGBD-780M leads on the differences that matter

The largest is module efficiency: 0.64 pp more efficient. 6 of 19 comparable parameters are identical.

See all 13 differences

How alike are they

6 of 19 comparable
parameters are identical

identical differs

What actually differs

13 of 19 parameters

Parameter GK-4-78HGBD-780M GSD8K66H-735WT Difference

Module efficiency 24.30 % 23.66 % 0.64 pp more efficient

Rated power 780 Wp 735 Wp 45 W more power

Product warranty 15 yrs 25 yrs 10 yrs longer

Power density 242.8 Wp/m² 236.6 Wp/m² 6.2 Wp/m² higher

Open-circuit voltage 58.92 V 51.50 V 7.42 V apart

Module area 3.212 m² 3.106 m² 0.106 m² apart

Weight per kWp 49.6 kg/kWp 53.1 kg/kWp 3.4 kg/kWp lighter

Cell technology Back Contact HJT Back Contact vs HJT

Voltage at max power 48.97 V 43.60 V 5.37 V apart

Cell count 156 132 24 cells apart

Short-circuit current 16.78 A 17.72 A 0.94 A apart

Dimensions 2465x1303x33 mm 2384x1303x35 mm 2465x1303x33 mm vs 2384x1303x35 mm

Current at max power 15.93 A 16.87 A 0.94 A apart

What it means on a roof

Thirty years of production

Each panel's own declared degradation curve, at 1,200 kWh/kWp a year

Cell temperature

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

26,374 kWh

GSD8K66H-735WT

24,853 kWh

Lifetime gap

1,521 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario GK-4-78HGBD-780M GSD8K66H-735WT

Standard test conditions 25 °C 100.0% of rated power 780 W 735 W

Cool, bright day 40 °C 96.1% of rated power 750 W 706 W

Typical summer roof 55 °C 92.2% of rated power 719 W 678 W

Hot roof 70 °C 88.3% of rated power 689 W 649 W

Full specification

Parameter GK-4-78HGBD-780M GSD8K66H-735WT Difference

Power and efficiency

Rated power 780 Wp 735 Wp +45 W for GK-4-78HGBD-780M

Module efficiency 24.30 % 23.66 % +0.64 pp for GK-4-78HGBD-780M

Power density 242.8 Wp/m² 236.6 Wp/m² +6.2 Wp/m² for GK-4-78HGBD-780M

Open-circuit voltage 58.92 V 51.50 V 7.42 V apart

Voltage at max power 48.97 V 43.60 V 5.37 V apart

Short-circuit current 16.78 A 17.72 A 0.94 A apart

Current at max power 15.93 A 16.87 A 0.94 A apart

Temperature

Temperature coefficient -0.260 %/°C -0.260 %/°C Same

Mechanical

Dimensions 2465x1303x33 mm 2384x1303x35 mm 2465x1303x33 mm vs 2384x1303x35 mm

Module area 3.212 m² 3.106 m² 0.106 m² apart

Weight 38.7 kg 39.0 kg Effectively the same

Weight per kWp 49.6 kg/kWp 53.1 kg/kWp -3.4 kg/kWp for GK-4-78HGBD-780M

Warranty and degradation

Product warranty 15 yrs 25 yrs +10 yrs for GSD8K66H-735WT

Performance warranty 30 yrs 30 yrs Same

Annual degradation 0.35 %/yr 0.35 %/yr Same

Technology

Cell technology Back Contact HJT Back Contact vs HJT

Cell type Monocrystalline Monocrystalline Same

Cell count 156 132 24 cells apart

Bifacial Yes Yes Same

Against the whole database

14,005 panels

Efficiency

#131 vs #602

GK-4-78HGBD-780M leads by 471 places

Power density

#138 vs #582

GK-4-78HGBD-780M leads by 444 places

Heat behaviour

#511 vs #511

Tied - the same position in the database

Weight

#3,161 vs #6,818

GK-4-78HGBD-780M leads by 3,657 places

Warranty

#21 vs #21

Tied - the same position in the database

Overall

#15 vs #21

GK-4-78HGBD-780M leads by 6 places

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Sharp

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The same specification on paper

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Written summary

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Questions about this pairing

Which panel is better: Gokin GK-4-78HGBD-780M or Sharp GSD8K66H-735WT?

According to our database: Gokin GK-4-78HGBD-780M has higher module efficiency (24.30% vs 23.66%). 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 Sharp GSD8K66H-735WT?

Gokin GK-4-78HGBD-780M has a module efficiency of 24.30%, while Sharp GSD8K66H-735WT is 23.66%. 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 Sharp GSD8K66H-735WT?

Gokin GK-4-78HGBD-780M uses Back Contact cells; Sharp GSD8K66H-735WT uses HJT. 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 Sharp GSD8K66H-735WT?

Gokin GK-4-78HGBD-780M has a 30 years power warranty; Sharp GSD8K66H-735WT 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 Sharp GSD8K66H-735WT bifacial panels?

Both Gokin GK-4-78HGBD-780M and Sharp GSD8K66H-735WT 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 Sharp 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.