Trina Solar TSM-NEG21C.20Q-760 vs Gokin GK-4-78HGBD-780M
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
TSM-NEG21C.20Q-760
GK-4-78HGBD-780M
Difference
Product warranty
12 yrs
15 yrs
3 yrs longer
Rated power
760 Wp
780 Wp
20 W more power
Open-circuit voltage
50.90 V
58.92 V
8.02 V apart
Short-circuit current
18.85 A
16.78 A
2.07 A apart
Module area
3.106 m²
3.212 m²
0.106 m² apart
Cell technology
TOPCon
Back Contact
TOPCon vs Back Contact
Module efficiency
24.50 %
24.30 %
0.20 pp more efficient
Voltage at max power
42.90 V
48.97 V
6.07 V apart
Cell count
264
156
108 cells apart
Current at max power
17.72 A
15.93 A
1.79 A apart
Dimensions
2384x1303x33 mm
2465x1303x33 mm
2384x1303x33 mm vs 2465x1303x33 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.
TSM-NEG21C.20Q-760
25,698 kWh
GK-4-78HGBD-780M
26,374 kWh
Lifetime gap
676 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
TSM-NEG21C.20Q-760
GK-4-78HGBD-780M
Standard test conditions
25 °C
100.0% of rated power
760 W
780 W
Cool, bright day
40 °C
96.1% of rated power
730 W
750 W
Typical summer roof
55 °C
92.2% of rated power
701 W
719 W
Hot roof
70 °C
88.3% of rated power
671 W
689 W
03
Full specification
Parameter
TSM-NEG21C.20Q-760
GK-4-78HGBD-780M
Difference
Power and efficiency
Rated power
760 Wp
780 Wp
+20 W for GK-4-78HGBD-780M
Module efficiency
24.50 %
24.30 %
+0.20 pp for TSM-NEG21C.20Q-760
Power density
244.7 Wp/m²
242.8 Wp/m²
Effectively the same
Open-circuit voltage
50.90 V
58.92 V
8.02 V apart
Voltage at max power
42.90 V
48.97 V
6.07 V apart
Short-circuit current
18.85 A
16.78 A
2.07 A apart
Current at max power
17.72 A
15.93 A
1.79 A apart
Temperature
Temperature coefficient
-0.260 %/°C
-0.260 %/°C
Same
Mechanical
Dimensions
2384x1303x33 mm
2465x1303x33 mm
2384x1303x33 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
50.4 kg/kWp
49.6 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
12 yrs
15 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
TOPCon
Back Contact
TOPCon vs Back Contact
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
264
156
108 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#74
vs
#131
TSM-NEG21C.20Q-760 leads by 57 places
Power density
#86
vs
#138
TSM-NEG21C.20Q-760 leads by 52 places
Heat behaviour
#511
vs
#511
Tied - the same position in the database
Weight
#3,780
vs
#3,161
GK-4-78HGBD-780M leads by 619 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#66
vs
#15
GK-4-78HGBD-780M leads by 51 places
05
Open the full database
More useful comparisons
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Trina Solar TSM-NEG21C.20Q-760 vs Trina Solar TSM-NEG21C.20Q-755
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Trina Solar TSM-NEG21C.20Q-760 vs Trina Solar TSM-NEG21C.20Q-750
3 differences, the largest is module efficiency
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Trina Solar TSM-NEG21C.20Q-760 vs Trina Solar TSM-NEG21C.20Q-745
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Trina Solar TSM-NEG21C.20Q-760 vs Trina Solar TSM-NEG21C.20Q-740
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Trina Solar TSM-NEG21C.20Q-760 vs Trina Solar TSM-NEG21C.20Q-735
5 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20Q-760 vs Trina Solar TSM-NEG19RC.20Q
8 differences, the largest is rated power
06
Written summary
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07
Questions about this pairing
Which panel is better: Trina Solar TSM-NEG21C.20Q-760 or Gokin GK-4-78HGBD-780M?
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 Trina Solar TSM-NEG21C.20Q-760 and Gokin GK-4-78HGBD-780M?
Trina Solar TSM-NEG21C.20Q-760 has a module efficiency of 24.50%, while Gokin GK-4-78HGBD-780M is 24.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Trina Solar TSM-NEG21C.20Q-760 use vs Gokin GK-4-78HGBD-780M?
Trina Solar TSM-NEG21C.20Q-760 uses TOPCon cells; Gokin GK-4-78HGBD-780M 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 Trina Solar TSM-NEG21C.20Q-760 and Gokin GK-4-78HGBD-780M?
Trina Solar TSM-NEG21C.20Q-760 has a 30 years power warranty; Gokin GK-4-78HGBD-780M 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 Trina Solar TSM-NEG21C.20Q-760 and Gokin GK-4-78HGBD-780M bifacial panels?
Both Trina Solar TSM-NEG21C.20Q-760 and Gokin GK-4-78HGBD-780M 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 238 Trina Solar offers · See 7 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.