GSD8K66H-740WT vs GK-4-78HGBD-780M 6 of 19 identical Swap Change panels

Sharp GSD8K66H-740WT vs Gokin GK-4-78HGBD-780M

Q: Which panel is better: Sharp GSD8K66H-740WT or Gokin GK-4-78HGBD-780M?

According to our database: Gokin GK-4-78HGBD-780M has higher module efficiency (24.30% vs 23.82%). See the full spec comparison and 30-year energy simulation above for a complete picture.

Q: What is the efficiency of Sharp GSD8K66H-740WT and Gokin GK-4-78HGBD-780M?

Sharp GSD8K66H-740WT has a module efficiency of 23.82%, while Gokin GK-4-78HGBD-780M is 24.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does Sharp GSD8K66H-740WT use vs Gokin GK-4-78HGBD-780M?

Sharp GSD8K66H-740WT uses HJT cells; Gokin GK-4-78HGBD-780M uses Back Contact. 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 Sharp GSD8K66H-740WT and Gokin GK-4-78HGBD-780M?

Sharp GSD8K66H-740WT has a 30 years power warranty; Gokin GK-4-78HGBD-780M 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 Sharp GSD8K66H-740WT and Gokin GK-4-78HGBD-780M bifacial panels?

Both Sharp GSD8K66H-740WT and Gokin GK-4-78HGBD-780M 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.

Sharp

GSD8K66H-740WT

740 Wp 23.82 % HJT Bifacial

Open panel page Datasheet PDF

Gokin

GK-4-78HGBD-780M

780 Wp 24.30 % Back Contact Bifacial

Open panel page Datasheet PDF

The verdict

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

The largest is rated power: 40 W more power. 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 GSD8K66H-740WT GK-4-78HGBD-780M Difference

Rated power 740 Wp 780 Wp 40 W more power

Module efficiency 23.82 % 24.30 % 0.48 pp more efficient

Product warranty 25 yrs 15 yrs 10 yrs longer

Open-circuit voltage 51.70 V 58.92 V 7.22 V apart

Module area 3.106 m² 3.212 m² 0.106 m² apart

Power density 238.2 Wp/m² 242.8 Wp/m² 4.6 Wp/m² higher

Cell technology HJT Back Contact HJT vs Back Contact

Weight per kWp 52.7 kg/kWp 49.6 kg/kWp 3.1 kg/kWp lighter

Voltage at max power 43.80 V 48.97 V 5.17 V apart

Cell count 132 156 24 cells apart

Short-circuit current 17.76 A 16.78 A 0.98 A apart

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

Current at max power 16.91 A 15.93 A 0.98 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.

GSD8K66H-740WT

25,022 kWh

GK-4-78HGBD-780M

26,374 kWh

Lifetime gap

1,352 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario GSD8K66H-740WT GK-4-78HGBD-780M

Standard test conditions 25 °C 100.0% of rated power 740 W 780 W

Cool, bright day 40 °C 96.1% of rated power 711 W 750 W

Typical summer roof 55 °C 92.2% of rated power 682 W 719 W

Hot roof 70 °C 88.3% of rated power 653 W 689 W

Full specification

Parameter GSD8K66H-740WT GK-4-78HGBD-780M Difference

Power and efficiency

Rated power 740 Wp 780 Wp +40 W for GK-4-78HGBD-780M

Module efficiency 23.82 % 24.30 % +0.48 pp for GK-4-78HGBD-780M

Power density 238.2 Wp/m² 242.8 Wp/m² +4.6 Wp/m² for GK-4-78HGBD-780M

Open-circuit voltage 51.70 V 58.92 V 7.22 V apart

Voltage at max power 43.80 V 48.97 V 5.17 V apart

Short-circuit current 17.76 A 16.78 A 0.98 A apart

Current at max power 16.91 A 15.93 A 0.98 A apart

Temperature

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

Mechanical

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

Module area 3.106 m² 3.212 m² 0.106 m² apart

Weight 39.0 kg 38.7 kg Effectively the same

Weight per kWp 52.7 kg/kWp 49.6 kg/kWp -3.1 kg/kWp for GK-4-78HGBD-780M

Warranty and degradation

Product warranty 25 yrs 15 yrs +10 yrs for GSD8K66H-740WT

Performance warranty 30 yrs 30 yrs Same

Annual degradation 0.35 %/yr 0.35 %/yr Same

Technology

Cell technology HJT Back Contact HJT vs Back Contact

Cell type Monocrystalline Monocrystalline Same

Cell count 132 156 24 cells apart

Bifacial Yes Yes Same

Against the whole database

14,005 panels

Efficiency

#418 vs #131

GK-4-78HGBD-780M leads by 287 places

Power density

#431 vs #138

GK-4-78HGBD-780M leads by 293 places

Heat behaviour

#511 vs #511

Tied - the same position in the database

Weight

#6,344 vs #3,161

GK-4-78HGBD-780M leads by 3,183 places

Warranty

#21 vs #21

Tied - the same position in the database

Overall

#12 vs #15

GSD8K66H-740WT leads by 3 places

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Written summary

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Questions about this pairing

Which panel is better: Sharp GSD8K66H-740WT or Gokin GK-4-78HGBD-780M?

According to our database: Gokin GK-4-78HGBD-780M has higher module efficiency (24.30% vs 23.82%). See the full spec comparison and 30-year energy simulation above for a complete picture.

What is the efficiency of Sharp GSD8K66H-740WT and Gokin GK-4-78HGBD-780M?

Sharp GSD8K66H-740WT has a module efficiency of 23.82%, while Gokin GK-4-78HGBD-780M is 24.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

What cell technology does Sharp GSD8K66H-740WT use vs Gokin GK-4-78HGBD-780M?

Sharp GSD8K66H-740WT uses HJT cells; Gokin GK-4-78HGBD-780M 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 Sharp GSD8K66H-740WT and Gokin GK-4-78HGBD-780M?

Sharp GSD8K66H-740WT has a 30 years power warranty; Gokin GK-4-78HGBD-780M 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 Sharp GSD8K66H-740WT and Gokin GK-4-78HGBD-780M bifacial panels?

Both Sharp GSD8K66H-740WT and Gokin GK-4-78HGBD-780M 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 Sharp and Gokin as manufacturers Portfolio, efficiency, cell technologies and warranty terms

Shop prices: See 6 Sharp offers · See 7 Gokin 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.