Trina Solar TSM-635NEG19RC.20 vs Trina Solar TSM-NEG21C.20-740
VS
The verdict
NEG21C.20-740 leads on the differences that matter
The largest is rated power: 105 W more power. 9 of 19 comparable parameters are identical.
See all 10 differencesHow alike are they
9
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
10 of 19 parameters
What actually differs
Parameter
635NEG19RC.20
NEG21C.20-740
Difference
Rated power
635 Wp
740 Wp
105 W more power
Weight
33.0 kg
38.3 kg
5.3 kg lighter
Short-circuit current
16.44 A
18.66 A
2.22 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
Current at max power
15.55 A
17.58 A
2.03 A apart
Open-circuit voltage
49.10 V
50.30 V
1.20 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
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.
635NEG19RC.20
21,306 kWh
NEG21C.20-740
24,828 kWh
Lifetime gap
3,522 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
635NEG19RC.20
NEG21C.20-740
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
708 W
Typical summer roof
55 °C
91.3% of rated power
580 W
676 W
Hot roof
70 °C
87.0% of rated power
552 W
643 W
03
Full specification
Parameter
635NEG19RC.20
NEG21C.20-740
Difference
Power and efficiency
Rated power
635 Wp
740 Wp
+105 W for NEG21C.20-740
Module efficiency
23.50 %
23.80 %
+0.30 pp for NEG21C.20-740
Power density
235.1 Wp/m²
238.2 Wp/m²
+3.1 Wp/m² for NEG21C.20-740
Open-circuit voltage
49.10 V
50.30 V
1.20 V apart
Voltage at max power
40.84 V
42.10 V
1.26 V apart
Short-circuit current
16.44 A
18.66 A
2.22 A apart
Current at max power
15.55 A
17.58 A
2.03 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
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
0.40 %/yr
Same
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
132
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#716
vs
#433
NEG21C.20-740 leads by 283 places
Power density
#741
vs
#431
NEG21C.20-740 leads by 310 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#5,408
vs
#5,125
NEG21C.20-740 leads by 283 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,750
vs
#185
NEG21C.20-740 leads by 1,565 places
05
Open the full database
More useful comparisons
Same series, other bin
Trina Solar TSM-635NEG19RC.20 vs Trina Solar TSM-NEG21C.20Q-760
13 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-635NEG19RC.20 vs Trina Solar TSM-NEG21C.20Q-755
13 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-635NEG19RC.20 vs Trina Solar TSM-NEG21C.20Q-750
13 differences, the largest is rated power
Same series, other bin
Trina Solar TSM-635NEG19RC.20 vs Trina Solar TSM-NEG21C.20Q-745
13 differences, the largest is rated power
Same series, other bin
Trina Solar TSM-635NEG19RC.20 vs Trina Solar TSM-NEG21C.20 740
10 differences, the largest is rated power
Same series, other bin
Trina Solar TSM-635NEG19RC.20 vs Trina Solar TSM-NEG21C.20Q-740
13 differences, the largest is rated power
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: Trina Solar TSM-635NEG19RC.20 or Trina Solar TSM-NEG21C.20-740?
According to our database: Trina Solar TSM-NEG21C.20-740 has higher module efficiency (23.80% vs 23.50%). 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.20-740?
Trina Solar TSM-635NEG19RC.20 has a module efficiency of 23.50%, 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-635NEG19RC.20 use vs Trina Solar TSM-NEG21C.20-740?
Trina Solar TSM-635NEG19RC.20 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-635NEG19RC.20 and Trina Solar TSM-NEG21C.20-740?
Trina Solar TSM-635NEG19RC.20 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-635NEG19RC.20 and Trina Solar TSM-NEG21C.20-740 bifacial panels?
Both Trina Solar TSM-635NEG19RC.20 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 213 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.