Gokin GK-4-78HGBD-775M vs MY Solar MS730N-HJTGB
VS
The verdict
GK-4-78HGBD-775M leads on the differences that matter
The largest is rated power: 45 W more power. 4 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 14 differencesHow alike are they
4
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
14 of 18 parameters
What actually differs
Parameter
GK-4-78HGBD-775M
MS730N-HJTGB
Difference
Rated power
775 Wp
730 Wp
45 W more power
Module efficiency
24.10 %
23.50 %
0.60 pp more efficient
Product warranty
15 yrs
30 yrs
15 yrs longer
Temperature coefficient
-0.260 %/°C
-0.240 %/°C
0.020 %/°C better in heat
Power density
241.3 Wp/m²
235.0 Wp/m²
6.3 Wp/m² higher
Open-circuit voltage
58.82 V
51.05 V
7.77 V apart
Module area
3.212 m²
3.106 m²
0.106 m² apart
Cell technology
Back Contact
HJT
Back Contact vs HJT
Short-circuit current
16.71 A
17.81 A
1.10 A apart
Voltage at max power
48.87 V
42.97 V
5.90 V apart
Cell count
156
132
24 cells apart
Weight per kWp
49.9 kg/kWp
52.5 kg/kWp
2.5 kg/kWp lighter
Current at max power
15.86 A
16.99 A
1.13 A apart
Dimensions
2465x1303x33 mm
2384x1303x35 mm
2465x1303x33 mm vs 2384x1303x35 mm
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
GK-4-78HGBD-775M
26,003 kWh
MS730N-HJTGB
24,493 kWh
Lifetime gap
1,510 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
GK-4-78HGBD-775M
MS730N-HJTGB
Standard test conditions
25 °C
100.0% of rated power
775 W
730 W
Cool, bright day
40 °C
96.1% of rated power
745 W
704 W
Typical summer roof
55 °C
92.2% of rated power
715 W
677 W
Hot roof
70 °C
88.3% of rated power
684 W
651 W
03
Full specification
Parameter
GK-4-78HGBD-775M
MS730N-HJTGB
Difference
Power and efficiency
Rated power
775 Wp
730 Wp
+45 W for GK-4-78HGBD-775M
Module efficiency
24.10 %
23.50 %
+0.60 pp for GK-4-78HGBD-775M
Power density
241.3 Wp/m²
235.0 Wp/m²
+6.3 Wp/m² for GK-4-78HGBD-775M
Open-circuit voltage
58.82 V
51.05 V
7.77 V apart
Voltage at max power
48.87 V
42.97 V
5.90 V apart
Short-circuit current
16.71 A
17.81 A
1.10 A apart
Current at max power
15.86 A
16.99 A
1.13 A apart
Temperature
Temperature coefficient
-0.260 %/°C
-0.240 %/°C
+0.020 %/°C for MS730N-HJTGB
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
38.3 kg
Effectively the same
Weight per kWp
49.9 kg/kWp
52.5 kg/kWp
-2.5 kg/kWp for GK-4-78HGBD-775M
Warranty and degradation
Product warranty
15 yrs
30 yrs
+15 yrs for MS730N-HJTGB
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.35 %/yr
-
Not published by MY Solar
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
04
14,005 panels
Against the whole database
Efficiency
#219
vs
#716
GK-4-78HGBD-775M leads by 497 places
Power density
#227
vs
#800
GK-4-78HGBD-775M leads by 573 places
Heat behaviour
#511
vs
#13
MS730N-HJTGB leads by 498 places
Weight
#3,297
vs
#5,993
GK-4-78HGBD-775M leads by 2,696 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#29
vs
#8
MS730N-HJTGB leads by 21 places
05
Open the full database
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06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: Gokin GK-4-78HGBD-775M or MY Solar MS730N-HJTGB?
According to our database: Gokin GK-4-78HGBD-775M has higher module efficiency (24.10% vs 23.50%); MY Solar MS730N-HJTGB tolerates heat better (temp coeff -0.240%/°C vs -0.260%/°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 MY Solar MS730N-HJTGB?
Gokin GK-4-78HGBD-775M has a module efficiency of 24.10%, while MY Solar MS730N-HJTGB is 23.50%. 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 MY Solar MS730N-HJTGB?
Gokin GK-4-78HGBD-775M uses Back Contact cells; MY Solar MS730N-HJTGB 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-775M and MY Solar MS730N-HJTGB?
Gokin GK-4-78HGBD-775M has a 30 years power warranty; MY Solar MS730N-HJTGB 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 MY Solar MS730N-HJTGB bifacial panels?
Both Gokin GK-4-78HGBD-775M and MY Solar MS730N-HJTGB 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.
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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.