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GK-4-78HGBD-780M vs JKM710-735N-66HL5-BDV-Z3-EU (735W bin) 4 of 19 identical Swap Change panels

Gokin GK-4-78HGBD-780M vs Jinko Solar JKM710-735N-66HL5-BDV-Z3-EU (735W bin)

Gokin GK-4-78HGBD-780M
Gokin
GK-4-78HGBD-780M
780 Wp 24.30 % Back Contact Bifacial
Open panel page Datasheet PDF
VS
Jinko Solar JKM710-735N-66HL5-BDV-Z3-EU (735W bin)
JKM710-735N-66HL5-BDV-Z3-EU (735W bin)
735 Wp 23.66 % TOPCon 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. 4 of 19 comparable parameters are identical.

See all 15 differences
How alike are they
4 of 19 comparable
parameters are identical
identical differs
01

What actually differs

15 of 19 parameters
Parameter GK-4-78HGBD-780M JKM710-735N-66HL5-BDV-Z3-EU (735W bin) Difference
Module efficiency 24.30 % 23.66 % 0.64 pp more efficient
Rated power 780 Wp 735 Wp 45 W more power
Temperature coefficient -0.260 %/°C -0.290 %/°C 0.030 %/°C better in heat
Product warranty 15 yrs 12 yrs 3 yrs longer
Power density 242.8 Wp/m² 236.6 Wp/m² 6.2 Wp/m² higher
Open-circuit voltage 58.92 V 49.52 V 9.40 V apart
Short-circuit current 16.78 A 18.88 A 2.10 A apart
Module area 3.212 m² 3.106 m² 0.106 m² apart
Cell technology Back Contact TOPCon Back Contact vs TOPCon
Annual degradation 0.35 %/yr 0.40 %/yr 0.05 %/yr slower
Voltage at max power 48.97 V 41.23 V 7.74 V apart
Cell count 156 132 24 cells apart
Current at max power 15.93 A 17.83 A 1.90 A apart
Weight 38.7 kg 37.5 kg 1.2 kg lighter
Dimensions 2465x1303x33 mm 2384x1303x33 mm 2465x1303x33 mm vs 2384x1303x33 mm
02

What it means on a roof

Thirty years of production
Each panel's own declared degradation curve, at 1,200 kWh/kWp a year
GK-4-78HGBD-780M
26,374 kWh
JKM710-735N-66HL5-BDV-Z3-EU (735W bin)
24,661 kWh
Lifetime gap
1,713 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario GK-4-78HGBD-780M JKM710-735N-66HL5-BDV-Z3-EU (735W bin)
Standard test conditions 25 °C 100.0% of rated power 780 W 735 W
Cool, bright day 40 °C 95.7% of rated power 750 W 703 W
Typical summer roof 55 °C 91.3% of rated power 719 W 671 W
Hot roof 70 °C 87.0% of rated power 689 W 639 W
03

Full specification

Parameter GK-4-78HGBD-780M JKM710-735N-66HL5-BDV-Z3-EU (735W bin) 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 49.52 V 9.40 V apart
Voltage at max power 48.97 V 41.23 V 7.74 V apart
Short-circuit current 16.78 A 18.88 A 2.10 A apart
Current at max power 15.93 A 17.83 A 1.90 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.290 %/°C +0.030 %/°C for GK-4-78HGBD-780M
Mechanical
Dimensions 2465x1303x33 mm 2384x1303x33 mm 2465x1303x33 mm vs 2384x1303x33 mm
Module area 3.212 m² 3.106 m² 0.106 m² apart
Weight 38.7 kg 37.5 kg -1.2 kg for JKM710-735N-66HL5-BDV-Z3-EU (735W bin)
Weight per kWp 49.6 kg/kWp 51.0 kg/kWp Effectively the same
Warranty and degradation
Product warranty 15 yrs 12 yrs +3 yrs for GK-4-78HGBD-780M
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.35 %/yr 0.40 %/yr -0.05 %/yr for GK-4-78HGBD-780M
Technology
Cell technology Back Contact TOPCon Back Contact vs TOPCon
Cell type Monocrystalline Monocrystalline Same
Cell count 156 132 24 cells apart
Bifacial Yes Yes Same
04

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 #2,165
GK-4-78HGBD-780M leads by 1,654 places
Weight
#3,161 vs #4,360
GK-4-78HGBD-780M leads by 1,199 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#15 vs #239
GK-4-78HGBD-780M leads by 224 places
05

More useful comparisons

Open the full database
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Gokin GK-4-78HGBD-780M vs Gokin GK-4-78HGBD-775M
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Gokin GK-4-78HGBD-780M vs Gokin GK-4-78HGBD-770M
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Gokin GK-4-78HGBD-780M vs Gokin GK-4-78HGBD-765M
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Gokin GK-4-78HGBD-780M vs Gokin GK-4-78HGBD-760M
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Same series, other bin
Jinko Solar JKM710-735N-66HL5-BDV-Z3-EU (735W bin) vs Jinko Solar JKM735N-66HL5-BDV-Z3-EU
The same specification on paper
Same series, other bin
Jinko Solar JKM710-735N-66HL5-BDV-Z3-EU (735W bin) vs Jinko Solar JKM735N-66HL5-BDV-Z6-EU
The same specification on paper
06

Written summary

07

Questions about this pairing

Which panel is better: Gokin GK-4-78HGBD-780M or Jinko Solar JKM710-735N-66HL5-BDV-Z3-EU (735W bin)?
According to our database: Gokin GK-4-78HGBD-780M has higher module efficiency (24.30% vs 23.66%); Gokin GK-4-78HGBD-780M tolerates heat better (temp coeff -0.260%/°C vs -0.290%/°C). 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 Jinko Solar JKM710-735N-66HL5-BDV-Z3-EU (735W bin)?
Gokin GK-4-78HGBD-780M has a module efficiency of 24.30%, while Jinko Solar JKM710-735N-66HL5-BDV-Z3-EU (735 W bin) 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 Jinko Solar JKM710-735N-66HL5-BDV-Z3-EU (735W bin)?
Gokin GK-4-78HGBD-780M uses Back Contact cells; Jinko Solar JKM710-735N-66HL5-BDV-Z3-EU (735 W bin) uses TOPCon. 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 Jinko Solar JKM710-735N-66HL5-BDV-Z3-EU (735W bin)?
Gokin GK-4-78HGBD-780M has a 30 years power warranty; Jinko Solar JKM710-735N-66HL5-BDV-Z3-EU (735 W bin) 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 Jinko Solar JKM710-735N-66HL5-BDV-Z3-EU (735W bin) bifacial panels?
Both Gokin GK-4-78HGBD-780M and Jinko Solar JKM710-735N-66HL5-BDV-Z3-EU (735 W bin) 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 Jinko Solar 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.