Gokin GK-4-78HGBD-780M vs Trina Solar TSM-NEG21C.20Q-760
VS
The verdict
GK-4-78HGBD-780M leads on the differences that matter
The largest is product warranty: 3 yrs longer. 8 of 19 comparable parameters are identical.
See all 11 differencesHow alike are they
8
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
11 of 19 parameters
What actually differs
Parameter
GK-4-78HGBD-780M
TSM-NEG21C.20Q-760
Difference
Product warranty
15 yrs
12 yrs
3 yrs longer
Rated power
780 Wp
760 Wp
20 W more power
Open-circuit voltage
58.92 V
50.90 V
8.02 V apart
Short-circuit current
16.78 A
18.85 A
2.07 A apart
Module area
3.212 m²
3.106 m²
0.106 m² apart
Cell technology
Back Contact
TOPCon
Back Contact vs TOPCon
Module efficiency
24.30 %
24.50 %
0.20 pp more efficient
Voltage at max power
48.97 V
42.90 V
6.07 V apart
Cell count
156
264
108 cells apart
Current at max power
15.93 A
17.72 A
1.79 A apart
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
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.
GK-4-78HGBD-780M
26,374 kWh
TSM-NEG21C.20Q-760
25,698 kWh
Lifetime gap
676 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
GK-4-78HGBD-780M
TSM-NEG21C.20Q-760
Standard test conditions
25 °C
100.0% of rated power
780 W
760 W
Cool, bright day
40 °C
96.1% of rated power
750 W
730 W
Typical summer roof
55 °C
92.2% of rated power
719 W
701 W
Hot roof
70 °C
88.3% of rated power
689 W
671 W
03
Full specification
Parameter
GK-4-78HGBD-780M
TSM-NEG21C.20Q-760
Difference
Power and efficiency
Rated power
780 Wp
760 Wp
+20 W for GK-4-78HGBD-780M
Module efficiency
24.30 %
24.50 %
+0.20 pp for TSM-NEG21C.20Q-760
Power density
242.8 Wp/m²
244.7 Wp/m²
Effectively the same
Open-circuit voltage
58.92 V
50.90 V
8.02 V apart
Voltage at max power
48.97 V
42.90 V
6.07 V apart
Short-circuit current
16.78 A
18.85 A
2.07 A apart
Current at max power
15.93 A
17.72 A
1.79 A apart
Temperature
Temperature coefficient
-0.260 %/°C
-0.260 %/°C
Same
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
38.3 kg
Effectively the same
Weight per kWp
49.6 kg/kWp
50.4 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
0.35 %/yr
Same
Technology
Cell technology
Back Contact
TOPCon
Back Contact vs TOPCon
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
156
264
108 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#131
vs
#74
TSM-NEG21C.20Q-760 leads by 57 places
Power density
#138
vs
#86
TSM-NEG21C.20Q-760 leads by 52 places
Heat behaviour
#511
vs
#511
Tied - the same position in the database
Weight
#3,161
vs
#3,780
GK-4-78HGBD-780M leads by 619 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#15
vs
#66
GK-4-78HGBD-780M leads by 51 places
05
Open the full database
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Trina Solar TSM-NEG21C.20Q-760 vs Trina Solar TSM-NEG21C.20Q-755
One difference: module efficiency
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3 differences, the largest is module efficiency
06
Written summary
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07
Questions about this pairing
Which panel is better: Gokin GK-4-78HGBD-780M or Trina Solar TSM-NEG21C.20Q-760?
According to our database: Trina Solar TSM-NEG21C.20Q-760 has higher module efficiency (24.50% vs 24.30%). 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 Trina Solar TSM-NEG21C.20Q-760?
Gokin GK-4-78HGBD-780M has a module efficiency of 24.30%, while Trina Solar TSM-NEG21C.20Q-760 is 24.50%. 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 Trina Solar TSM-NEG21C.20Q-760?
Gokin GK-4-78HGBD-780M uses Back Contact cells; Trina Solar TSM-NEG21C.20Q-760 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 Trina Solar TSM-NEG21C.20Q-760?
Gokin GK-4-78HGBD-780M has a 30 years power warranty; Trina Solar TSM-NEG21C.20Q-760 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 Trina Solar TSM-NEG21C.20Q-760 bifacial panels?
Both Gokin GK-4-78HGBD-780M and Trina Solar TSM-NEG21C.20Q-760 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 7 Gokin offers · See 238 Trina Solar 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.