Trina Solar TSM-635NEG19RC.20 vs Trina Solar TSM-NEG21C.20-730
VS
The verdict
6 differences, and they point both ways
The largest is rated power: 95 W more power. 13 of 19 comparable parameters are identical.
See all 6 differencesHow alike are they
13
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
6 of 19 parameters
What actually differs
Parameter
635NEG19RC.20
NEG21C.20-730
Difference
Rated power
635 Wp
730 Wp
95 W more power
Weight
33.0 kg
38.3 kg
5.3 kg lighter
Short-circuit current
16.44 A
18.58 A
2.14 A apart
Module area
2.701 m²
3.106 m²
0.405 m² apart
Current at max power
15.55 A
17.51 A
1.96 A apart
Dimensions
2382x1134x30 mm
2384x1303x33 mm
2382x1134x30 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.
635NEG19RC.20
21,306 kWh
NEG21C.20-730
24,493 kWh
Lifetime gap
3,187 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
635NEG19RC.20
NEG21C.20-730
Standard test conditions
25 °C
100.0% of rated power
635 W
730 W
Cool, bright day
40 °C
95.7% of rated power
607 W
698 W
Typical summer roof
55 °C
91.3% of rated power
580 W
666 W
Hot roof
70 °C
87.0% of rated power
552 W
635 W
03
Full specification
Parameter
635NEG19RC.20
NEG21C.20-730
Difference
Power and efficiency
Rated power
635 Wp
730 Wp
+95 W for NEG21C.20-730
Module efficiency
23.50 %
23.50 %
Same
Power density
235.1 Wp/m²
235.0 Wp/m²
Effectively the same
Open-circuit voltage
49.10 V
49.90 V
Effectively the same
Voltage at max power
40.84 V
41.70 V
Effectively the same
Short-circuit current
16.44 A
18.58 A
2.14 A apart
Current at max power
15.55 A
17.51 A
1.96 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
52.5 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
14,129 panels
Against the whole database
Efficiency
#749
vs
#749
Tied - the same position in the database
Power density
#777
vs
#836
635NEG19RC.20 leads by 59 places
Heat behaviour
#2,220
vs
#2,220
Tied - the same position in the database
Weight
#5,440
vs
#6,040
635NEG19RC.20 leads by 600 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,769
vs
#316
NEG21C.20-730 leads by 1,453 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.20-730?
According to our database: both panels are closely matched on key specs - the decision often comes down to price and local availability. 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.20-730?
Trina Solar TSM-635NEG19RC.20 has a module efficiency of 23.50%, while Trina Solar TSM-NEG21C.20-730 is 23.50%. 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.20-730?
Trina Solar TSM-635NEG19RC.20 uses TOPCon cells; Trina Solar TSM-NEG21C.20-730 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.20-730?
Trina Solar TSM-635NEG19RC.20 has a 30 years power warranty; Trina Solar TSM-NEG21C.20-730 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.20-730 bifacial panels?
Both Trina Solar TSM-635NEG19RC.20 and Trina Solar TSM-NEG21C.20-730 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 184 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.