Trina Solar TSM-NEG9RC.27-425 vs Trina Solar TSM-NEG21C.20 740
VS
The verdict
NEG21C.20 740 leads on the differences that matter
The largest is module efficiency: 2.50 pp more efficient. 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
NEG9RC.27-425
NEG21C.20 740
Difference
Module efficiency
21.30 %
23.80 %
2.50 pp more efficient
Rated power
425 Wp
740 Wp
315 W more power
Power density
212.7 Wp/m²
238.2 Wp/m²
25.5 Wp/m² higher
Weight
21.0 kg
38.3 kg
17.3 kg lighter
Product warranty
15 yrs
12 yrs
3 yrs longer
Short-circuit current
10.56 A
18.66 A
8.10 A apart
Module area
1.998 m²
3.106 m²
1.108 m² apart
Current at max power
9.92 A
17.58 A
7.66 A apart
Cell count
144
132
12 cells apart
Weight per kWp
49.4 kg/kWp
51.8 kg/kWp
2.3 kg/kWp lighter
Dimensions
1762x1134x30 mm
2384x1303x33 mm
1762x1134x30 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 (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
NEG9RC.27-425
14,260 kWh
NEG21C.20 740
24,828 kWh
Lifetime gap
10,568 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
NEG9RC.27-425
NEG21C.20 740
Standard test conditions
25 °C
100.0% of rated power
425 W
740 W
Cool, bright day
40 °C
95.7% of rated power
407 W
708 W
Typical summer roof
55 °C
91.3% of rated power
388 W
676 W
Hot roof
70 °C
87.0% of rated power
370 W
643 W
03
Full specification
Parameter
NEG9RC.27-425
NEG21C.20 740
Difference
Power and efficiency
Rated power
425 Wp
740 Wp
+315 W for NEG21C.20 740
Module efficiency
21.30 %
23.80 %
+2.50 pp for NEG21C.20 740
Power density
212.7 Wp/m²
238.2 Wp/m²
+25.5 Wp/m² for NEG21C.20 740
Open-circuit voltage
50.90 V
50.30 V
Effectively the same
Voltage at max power
42.90 V
42.10 V
Effectively the same
Short-circuit current
10.56 A
18.66 A
8.10 A apart
Current at max power
9.92 A
17.58 A
7.66 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
1762x1134x30 mm
2384x1303x33 mm
1762x1134x30 mm vs 2384x1303x33 mm
Module area
1.998 m²
3.106 m²
1.108 m² apart
Weight
21.0 kg
38.3 kg
-17.3 kg for NEG9RC.27-425
Weight per kWp
49.4 kg/kWp
51.8 kg/kWp
-2.3 kg/kWp for NEG9RC.27-425
Warranty and degradation
Product warranty
15 yrs
12 yrs
+3 yrs for NEG9RC.27-425
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.40 %/yr
0.40 %/yr
Same
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
144
132
12 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#8,519
vs
#433
NEG21C.20 740 leads by 8,086 places
Power density
#8,733
vs
#431
NEG21C.20 740 leads by 8,302 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#2,909
vs
#5,125
NEG9RC.27-425 leads by 2,216 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#10,224
vs
#185
NEG21C.20 740 leads by 10,039 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: Trina Solar TSM-NEG9RC.27-425 or Trina Solar TSM-NEG21C.20 740?
According to our database: Trina Solar TSM-NEG21C.20 740 has higher module efficiency (23.80% vs 21.30%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Trina Solar TSM-NEG9RC.27-425 and Trina Solar TSM-NEG21C.20 740?
Trina Solar TSM-NEG9RC.27-425 has a module efficiency of 21.30%, while Trina Solar TSM-NEG21C.20 740 is 23.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Trina Solar TSM-NEG9RC.27-425 use vs Trina Solar TSM-NEG21C.20 740?
Trina Solar TSM-NEG9RC.27-425 uses TOPCon cells; Trina Solar TSM-NEG21C.20 740 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-NEG9RC.27-425 and Trina Solar TSM-NEG21C.20 740?
Trina Solar TSM-NEG9RC.27-425 has a 30 years power warranty; Trina Solar TSM-NEG21C.20 740 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-NEG9RC.27-425 and Trina Solar TSM-NEG21C.20 740 bifacial panels?
Both Trina Solar TSM-NEG9RC.27-425 and Trina Solar TSM-NEG21C.20 740 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
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.