Trina Solar TSM-NEG21C.20Q-755 vs Trina Solar TSM-NEG9RC.27-425
VS
The verdict
NEG21C.20Q-755 leads on the differences that matter
The largest is module efficiency: 3.00 pp more efficient. 7 of 19 comparable parameters are identical.
See all 12 differencesHow alike are they
7
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
12 of 19 parameters
What actually differs
Parameter
NEG21C.20Q-755
NEG9RC.27-425
Difference
Module efficiency
24.30 %
21.30 %
3.00 pp more efficient
Rated power
755 Wp
425 Wp
330 W more power
Power density
243.1 Wp/m²
212.7 Wp/m²
30.3 Wp/m² higher
Temperature coefficient
-0.260 %/°C
-0.290 %/°C
0.030 %/°C better in heat
Weight
38.3 kg
21.0 kg
17.3 kg lighter
Product warranty
12 yrs
15 yrs
3 yrs longer
Short-circuit current
18.81 A
10.56 A
8.25 A apart
Module area
3.106 m²
1.998 m²
1.108 m² apart
Annual degradation
0.35 %/yr
0.40 %/yr
0.05 %/yr slower
Current at max power
17.69 A
9.92 A
7.77 A apart
Cell count
264
144
120 cells apart
Dimensions
2384x1303x33 mm
1762x1134x30 mm
2384x1303x33 mm vs 1762x1134x30 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
NEG21C.20Q-755
25,529 kWh
NEG9RC.27-425
14,260 kWh
Lifetime gap
11,269 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
NEG21C.20Q-755
NEG9RC.27-425
Standard test conditions
25 °C
100.0% of rated power
755 W
425 W
Cool, bright day
40 °C
95.7% of rated power
726 W
407 W
Typical summer roof
55 °C
91.3% of rated power
696 W
388 W
Hot roof
70 °C
87.0% of rated power
667 W
370 W
03
Full specification
Parameter
NEG21C.20Q-755
NEG9RC.27-425
Difference
Power and efficiency
Rated power
755 Wp
425 Wp
+330 W for NEG21C.20Q-755
Module efficiency
24.30 %
21.30 %
+3.00 pp for NEG21C.20Q-755
Power density
243.1 Wp/m²
212.7 Wp/m²
+30.3 Wp/m² for NEG21C.20Q-755
Open-circuit voltage
50.70 V
50.90 V
Effectively the same
Voltage at max power
42.70 V
42.90 V
Effectively the same
Short-circuit current
18.81 A
10.56 A
8.25 A apart
Current at max power
17.69 A
9.92 A
7.77 A apart
Temperature
Temperature coefficient
-0.260 %/°C
-0.290 %/°C
+0.030 %/°C for NEG21C.20Q-755
Mechanical
Dimensions
2384x1303x33 mm
1762x1134x30 mm
2384x1303x33 mm vs 1762x1134x30 mm
Module area
3.106 m²
1.998 m²
1.108 m² apart
Weight
38.3 kg
21.0 kg
-17.3 kg for NEG9RC.27-425
Weight per kWp
50.7 kg/kWp
49.4 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
12 yrs
15 yrs
+3 yrs for NEG9RC.27-425
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.35 %/yr
0.40 %/yr
-0.05 %/yr for NEG21C.20Q-755
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
264
144
120 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#131
vs
#8,519
NEG21C.20Q-755 leads by 8,388 places
Power density
#136
vs
#8,733
NEG21C.20Q-755 leads by 8,597 places
Heat behaviour
#511
vs
#2,165
NEG21C.20Q-755 leads by 1,654 places
Weight
#4,131
vs
#2,909
NEG9RC.27-425 leads by 1,222 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#91
vs
#10,224
NEG21C.20Q-755 leads by 10,133 places
05
Open the full database
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Trina Solar TSM-NEG21C.20Q-755 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-755 or Trina Solar TSM-NEG9RC.27-425?
According to our database: Trina Solar TSM-NEG21C.20Q-755 has higher module efficiency (24.30% vs 21.30%); Trina Solar TSM-NEG21C.20Q-755 tolerates heat better (temp coeff -0.260%/°C vs -0.290%/°C). 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-755 and Trina Solar TSM-NEG9RC.27-425?
Trina Solar TSM-NEG21C.20Q-755 has a module efficiency of 24.30%, while Trina Solar TSM-NEG9RC.27-425 is 21.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Trina Solar TSM-NEG21C.20Q-755 use vs Trina Solar TSM-NEG9RC.27-425?
Trina Solar TSM-NEG21C.20Q-755 uses TOPCon cells; Trina Solar TSM-NEG9RC.27-425 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 Trina Solar TSM-NEG21C.20Q-755 and Trina Solar TSM-NEG9RC.27-425?
Trina Solar TSM-NEG21C.20Q-755 has a 30 years power warranty; Trina Solar TSM-NEG9RC.27-425 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-755 and Trina Solar TSM-NEG9RC.27-425 bifacial panels?
Both Trina Solar TSM-NEG21C.20Q-755 and Trina Solar TSM-NEG9RC.27-425 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 248 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.