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GK-4-78HGBD-775M vs YH720W-33MHD/MH 4 of 18 identical Swap Change panels

Gokin GK-4-78HGBD-775M vs IBC Solar YH720W-33MHD/MH

Gokin GK-4-78HGBD-775M
Gokin
GK-4-78HGBD-775M
775 Wp 24.10 % Back Contact Bifacial
Open panel page Datasheet PDF
VS
IBC Solar
YH720W-33MHD/MH
720 Wp 23.18 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

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

The largest is module efficiency: 0.92 pp more efficient. 4 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 14 differences
How alike are they
4 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

14 of 18 parameters
Parameter GK-4-78HGBD-775M YH720W-33MHD/MH Difference
Module efficiency 24.10 % 23.18 % 0.92 pp more efficient
Temperature coefficient -0.260 %/°C -0.350 %/°C 0.090 %/°C better in heat
Rated power 775 Wp 720 Wp 55 W more power
Power density 241.3 Wp/m² 231.8 Wp/m² 9.5 Wp/m² higher
Product warranty 15 yrs 30 yrs 15 yrs longer
Open-circuit voltage 58.82 V 49.82 V 9.00 V apart
Module area 3.212 m² 3.106 m² 0.106 m² apart
Short-circuit current 16.71 A 18.13 A 1.42 A apart
Cell technology Back Contact TOPCon Back Contact vs TOPCon
Weight per kWp 49.9 kg/kWp 52.8 kg/kWp 2.8 kg/kWp lighter
Voltage at max power 48.87 V 41.52 V 7.35 V apart
Cell count 156 132 24 cells apart
Current at max power 15.86 A 17.34 A 1.48 A apart
Dimensions 2465x1303x33 mm 2384x1303x33 mm 2465x1303x33 mm vs 2384x1303x33 mm
02

What it means on a roof

Thirty years of production
Declared first-year losses, with 0.40% a year afterwards assumed for both panels, at 1,200 kWh/kWp a year
GK-4-78HGBD-775M
26,003 kWh
YH720W-33MHD/MH
24,157 kWh
Lifetime gap
1,846 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario GK-4-78HGBD-775M YH720W-33MHD/MH
Standard test conditions 25 °C 100.0% of rated power 775 W 720 W
Cool, bright day 40 °C 94.8% of rated power 745 W 682 W
Typical summer roof 55 °C 89.5% of rated power 715 W 644 W
Hot roof 70 °C 84.2% of rated power 684 W 607 W
03

Full specification

Parameter GK-4-78HGBD-775M YH720W-33MHD/MH Difference
Power and efficiency
Rated power 775 Wp 720 Wp +55 W for GK-4-78HGBD-775M
Module efficiency 24.10 % 23.18 % +0.92 pp for GK-4-78HGBD-775M
Power density 241.3 Wp/m² 231.8 Wp/m² +9.5 Wp/m² for GK-4-78HGBD-775M
Open-circuit voltage 58.82 V 49.82 V 9.00 V apart
Voltage at max power 48.87 V 41.52 V 7.35 V apart
Short-circuit current 16.71 A 18.13 A 1.42 A apart
Current at max power 15.86 A 17.34 A 1.48 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.350 %/°C +0.090 %/°C for GK-4-78HGBD-775M
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 38.0 kg Effectively the same
Weight per kWp 49.9 kg/kWp 52.8 kg/kWp -2.8 kg/kWp for GK-4-78HGBD-775M
Warranty and degradation
Product warranty 15 yrs 30 yrs +15 yrs for YH720W-33MHD/MH
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.35 %/yr - Not published by IBC Solar
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
#219 vs #1,424
GK-4-78HGBD-775M leads by 1,205 places
Power density
#227 vs #1,347
GK-4-78HGBD-775M leads by 1,120 places
Heat behaviour
#511 vs #10,419
GK-4-78HGBD-775M leads by 9,908 places
Weight
#3,297 vs #6,459
GK-4-78HGBD-775M leads by 3,162 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#29 vs #24
YH720W-33MHD/MH leads by 5 places
05

More useful comparisons

Open the full database
Same series, other bin
Gokin
Gokin GK-4-78HGBD-775M vs Gokin GK-4-78HGBD-780M
One difference: module efficiency
Same series, other bin
Gokin
Gokin GK-4-78HGBD-775M vs Gokin GK-4-78HGBD-770M
The same specification on paper
Same series, other bin
Gokin
Gokin GK-4-78HGBD-775M vs Gokin GK-4-78HGBD-765M
3 differences, the largest is module efficiency
Same series, other bin
Gokin
Gokin GK-4-78HGBD-775M vs Gokin GK-4-78HGBD-760M
3 differences, the largest is module efficiency
Same series, other bin
IBC Solar
IBC Solar YH720W-33MHD/MH vs IBC Solar YH715W-33MHD/MH
The same specification on paper
Same series, other bin
IBC Solar
IBC Solar YH720W-33MHD/MH vs IBC Solar YH710W-33MHD/MH
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 IBC Solar YH720W-33MHD/MH?
According to our database: Gokin GK-4-78HGBD-775M has higher module efficiency (24.10% vs 23.18%); Gokin GK-4-78HGBD-775M tolerates heat better (temp coeff -0.260%/°C vs -0.350%/°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-775M and IBC Solar YH720W-33MHD/MH?
Gokin GK-4-78HGBD-775M has a module efficiency of 24.10%, while IBC Solar YH720 W-33MHD/MH is 23.18%. 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 IBC Solar YH720W-33MHD/MH?
Gokin GK-4-78HGBD-775M uses Back Contact cells; IBC Solar YH720 W-33MHD/MH 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-775M and IBC Solar YH720W-33MHD/MH?
Gokin GK-4-78HGBD-775M has a 30 years power warranty; IBC Solar YH720 W-33MHD/MH 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 IBC Solar YH720W-33MHD/MH bifacial panels?
Both Gokin GK-4-78HGBD-775M and IBC Solar YH720 W-33MHD/MH 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 IBC 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.