Trina Solar TSM-635NEG19RC.20 vs Trina Solar TSM-NEG21C.20Q-740
VS
The verdict
NEG21C.20Q-740 leads on the differences that matter
The largest is rated power: 105 W more power. 6 of 19 comparable parameters are identical.
See all 13 differencesHow alike are they
6
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
13 of 19 parameters
What actually differs
Parameter
635NEG19RC.20
NEG21C.20Q-740
Difference
Rated power
635 Wp
740 Wp
105 W more power
Temperature coefficient
-0.290 %/°C
-0.260 %/°C
0.030 %/°C better in heat
Weight
33.0 kg
38.3 kg
5.3 kg lighter
Short-circuit current
16.44 A
18.69 A
2.25 A apart
Module area
2.701 m²
3.106 m²
0.405 m² apart
Module efficiency
23.50 %
23.80 %
0.30 pp more efficient
Power density
235.1 Wp/m²
238.2 Wp/m²
3.1 Wp/m² higher
Annual degradation
0.40 %/yr
0.35 %/yr
0.05 %/yr slower
Current at max power
15.55 A
17.58 A
2.03 A apart
Cell count
132
264
132 cells apart
Open-circuit voltage
49.10 V
50.10 V
1.00 V apart
Dimensions
2382x1134x30 mm
2384x1303x33 mm
2382x1134x30 mm vs 2384x1303x33 mm
Voltage at max power
40.84 V
42.10 V
1.26 V apart
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
635NEG19RC.20
21,306 kWh
NEG21C.20Q-740
25,022 kWh
Lifetime gap
3,716 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
635NEG19RC.20
NEG21C.20Q-740
Standard test conditions
25 °C
100.0% of rated power
635 W
740 W
Cool, bright day
40 °C
95.7% of rated power
607 W
711 W
Typical summer roof
55 °C
91.3% of rated power
580 W
682 W
Hot roof
70 °C
87.0% of rated power
552 W
653 W
03
Full specification
Parameter
635NEG19RC.20
NEG21C.20Q-740
Difference
Power and efficiency
Rated power
635 Wp
740 Wp
+105 W for NEG21C.20Q-740
Module efficiency
23.50 %
23.80 %
+0.30 pp for NEG21C.20Q-740
Power density
235.1 Wp/m²
238.2 Wp/m²
+3.1 Wp/m² for NEG21C.20Q-740
Open-circuit voltage
49.10 V
50.10 V
1.00 V apart
Voltage at max power
40.84 V
42.10 V
1.26 V apart
Short-circuit current
16.44 A
18.69 A
2.25 A apart
Current at max power
15.55 A
17.58 A
2.03 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.260 %/°C
+0.030 %/°C for NEG21C.20Q-740
Mechanical
Dimensions
2382x1134x30 mm
2384x1303x33 mm
2382x1134x30 mm vs 2384x1303x33 mm
Module area
2.701 m²
3.106 m²
0.405 m² apart
Weight
33.0 kg
38.3 kg
-5.3 kg for 635NEG19RC.20
Weight per kWp
52.0 kg/kWp
51.8 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.40 %/yr
0.35 %/yr
-0.05 %/yr for NEG21C.20Q-740
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
264
132 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#716
vs
#433
NEG21C.20Q-740 leads by 283 places
Power density
#741
vs
#431
NEG21C.20Q-740 leads by 310 places
Heat behaviour
#2,165
vs
#511
NEG21C.20Q-740 leads by 1,654 places
Weight
#5,408
vs
#5,125
NEG21C.20Q-740 leads by 283 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,750
vs
#185
NEG21C.20Q-740 leads by 1,565 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-635NEG19RC.20 or Trina Solar TSM-NEG21C.20Q-740?
According to our database: Trina Solar TSM-NEG21C.20Q-740 has higher module efficiency (23.80% vs 23.50%); Trina Solar TSM-NEG21C.20Q-740 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-635NEG19RC.20 and Trina Solar TSM-NEG21C.20Q-740?
Trina Solar TSM-635NEG19RC.20 has a module efficiency of 23.50%, while Trina Solar TSM-NEG21C.20Q-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-635NEG19RC.20 use vs Trina Solar TSM-NEG21C.20Q-740?
Trina Solar TSM-635NEG19RC.20 uses TOPCon cells; Trina Solar TSM-NEG21C.20Q-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-635NEG19RC.20 and Trina Solar TSM-NEG21C.20Q-740?
Trina Solar TSM-635NEG19RC.20 has a 30 years power warranty; Trina Solar TSM-NEG21C.20Q-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-635NEG19RC.20 and Trina Solar TSM-NEG21C.20Q-740 bifacial panels?
Both Trina Solar TSM-635NEG19RC.20 and Trina Solar TSM-NEG21C.20Q-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 214 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.