MY Solar MS740N-HJTGB vs Gokin GK-4-78HGBD-775M
VS
The verdict
13 differences, and they point both ways
The largest is rated power: 35 W more power. 5 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 13 differencesHow alike are they
5
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
13 of 18 parameters
What actually differs
Parameter
MS740N-HJTGB
GK-4-78HGBD-775M
Difference
Rated power
740 Wp
775 Wp
35 W more power
Product warranty
30 yrs
15 yrs
15 yrs longer
Temperature coefficient
-0.240 %/°C
-0.260 %/°C
0.020 %/°C better in heat
Open-circuit voltage
51.35 V
58.82 V
7.47 V apart
Module area
3.106 m²
3.212 m²
0.106 m² apart
Module efficiency
23.82 %
24.10 %
0.28 pp more efficient
Cell technology
HJT
Back Contact
HJT vs Back Contact
Short-circuit current
17.95 A
16.71 A
1.24 A apart
Power density
238.2 Wp/m²
241.3 Wp/m²
3.1 Wp/m² higher
Voltage at max power
43.25 V
48.87 V
5.62 V apart
Cell count
132
156
24 cells apart
Current at max power
17.13 A
15.86 A
1.27 A apart
Dimensions
2384x1303x35 mm
2465x1303x33 mm
2384x1303x35 mm vs 2465x1303x33 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
MS740N-HJTGB
24,828 kWh
GK-4-78HGBD-775M
26,003 kWh
Lifetime gap
1,175 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
MS740N-HJTGB
GK-4-78HGBD-775M
Standard test conditions
25 °C
100.0% of rated power
740 W
775 W
Cool, bright day
40 °C
96.1% of rated power
713 W
745 W
Typical summer roof
55 °C
92.2% of rated power
687 W
715 W
Hot roof
70 °C
88.3% of rated power
660 W
684 W
03
Full specification
Parameter
MS740N-HJTGB
GK-4-78HGBD-775M
Difference
Power and efficiency
Rated power
740 Wp
775 Wp
+35 W for GK-4-78HGBD-775M
Module efficiency
23.82 %
24.10 %
+0.28 pp for GK-4-78HGBD-775M
Power density
238.2 Wp/m²
241.3 Wp/m²
+3.1 Wp/m² for GK-4-78HGBD-775M
Open-circuit voltage
51.35 V
58.82 V
7.47 V apart
Voltage at max power
43.25 V
48.87 V
5.62 V apart
Short-circuit current
17.95 A
16.71 A
1.24 A apart
Current at max power
17.13 A
15.86 A
1.27 A apart
Temperature
Temperature coefficient
-0.240 %/°C
-0.260 %/°C
+0.020 %/°C for MS740N-HJTGB
Mechanical
Dimensions
2384x1303x35 mm
2465x1303x33 mm
2384x1303x35 mm vs 2465x1303x33 mm
Module area
3.106 m²
3.212 m²
0.106 m² apart
Weight
38.3 kg
38.7 kg
Effectively the same
Weight per kWp
51.8 kg/kWp
49.9 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
30 yrs
15 yrs
+15 yrs for MS740N-HJTGB
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
-
0.35 %/yr
Not published by MY Solar
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
04
14,005 panels
Against the whole database
Efficiency
#418
vs
#219
GK-4-78HGBD-775M leads by 199 places
Power density
#431
vs
#227
GK-4-78HGBD-775M leads by 204 places
Heat behaviour
#13
vs
#511
MS740N-HJTGB leads by 498 places
Weight
#5,125
vs
#3,297
GK-4-78HGBD-775M leads by 1,828 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#3
vs
#29
MS740N-HJTGB leads by 26 places
05
Open the full database
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06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: MY Solar MS740N-HJTGB or Gokin GK-4-78HGBD-775M?
According to our database: Gokin GK-4-78HGBD-775M has higher module efficiency (24.10% vs 23.82%); MY Solar MS740N-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 MY Solar MS740N-HJTGB and Gokin GK-4-78HGBD-775M?
MY Solar MS740N-HJTGB has a module efficiency of 23.82%, while Gokin GK-4-78HGBD-775M is 24.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does MY Solar MS740N-HJTGB use vs Gokin GK-4-78HGBD-775M?
MY Solar MS740N-HJTGB uses HJT cells; Gokin GK-4-78HGBD-775M 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 MY Solar MS740N-HJTGB and Gokin GK-4-78HGBD-775M?
MY Solar MS740N-HJTGB has a 30 years power warranty; Gokin GK-4-78HGBD-775M 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 MY Solar MS740N-HJTGB and Gokin GK-4-78HGBD-775M bifacial panels?
Both MY Solar MS740N-HJTGB and Gokin GK-4-78HGBD-775M 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.
Shop prices: See 2 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.