Trina Solar TSM-NEG21C.20 735 vs Trina Solar TSM-635NEG19RC.20
VS
The verdict
NEG21C.20 735 leads on the differences that matter
The largest is rated power: 100 W more power. 10 of 19 comparable parameters are identical.
See all 9 differencesHow alike are they
10
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
9 of 19 parameters
What actually differs
Parameter
NEG21C.20 735
635NEG19RC.20
Difference
Rated power
735 Wp
635 Wp
100 W more power
Weight
38.3 kg
33.0 kg
5.3 kg lighter
Short-circuit current
18.62 A
16.44 A
2.18 A apart
Module area
3.106 m²
2.701 m²
0.405 m² apart
Module efficiency
23.70 %
23.50 %
0.20 pp more efficient
Current at max power
17.55 A
15.55 A
2.00 A apart
Open-circuit voltage
50.10 V
49.10 V
1.00 V apart
Dimensions
2384x1303x33 mm
2382x1134x30 mm
2384x1303x33 mm vs 2382x1134x30 mm
Voltage at max power
41.90 V
40.84 V
1.06 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.
NEG21C.20 735
24,661 kWh
635NEG19RC.20
21,306 kWh
Lifetime gap
3,355 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
NEG21C.20 735
635NEG19RC.20
Standard test conditions
25 °C
100.0% of rated power
735 W
635 W
Cool, bright day
40 °C
95.7% of rated power
703 W
607 W
Typical summer roof
55 °C
91.3% of rated power
671 W
580 W
Hot roof
70 °C
87.0% of rated power
639 W
552 W
03
Full specification
Parameter
NEG21C.20 735
635NEG19RC.20
Difference
Power and efficiency
Rated power
735 Wp
635 Wp
+100 W for NEG21C.20 735
Module efficiency
23.70 %
23.50 %
+0.20 pp for NEG21C.20 735
Power density
236.6 Wp/m²
235.1 Wp/m²
Effectively the same
Open-circuit voltage
50.10 V
49.10 V
1.00 V apart
Voltage at max power
41.90 V
40.84 V
1.06 V apart
Short-circuit current
18.62 A
16.44 A
2.18 A apart
Current at max power
17.55 A
15.55 A
2.00 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
2384x1303x33 mm
2382x1134x30 mm
2384x1303x33 mm vs 2382x1134x30 mm
Module area
3.106 m²
2.701 m²
0.405 m² apart
Weight
38.3 kg
33.0 kg
-5.3 kg for 635NEG19RC.20
Weight per kWp
52.1 kg/kWp
52.0 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
#549
vs
#749
NEG21C.20 735 leads by 200 places
Power density
#614
vs
#777
NEG21C.20 735 leads by 163 places
Heat behaviour
#2,220
vs
#2,220
Tied - the same position in the database
Weight
#5,616
vs
#5,440
635NEG19RC.20 leads by 176 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#234
vs
#1,769
NEG21C.20 735 leads by 1,535 places
05
Open the full database
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The same specification on paper
Same series, other bin
Trina Solar TSM-NEG21C.20 735 vs Trina Solar TSM-NEG21C.20 740
The same specification on paper
06
Written summary
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07
Questions about this pairing
Which panel is better: Trina Solar TSM-NEG21C.20 735 or Trina Solar TSM-635NEG19RC.20?
According to our database: Trina Solar TSM-NEG21C.20 735 has higher module efficiency (23.70% 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-NEG21C.20 735 and Trina Solar TSM-635NEG19RC.20?
Trina Solar TSM-NEG21C.20 735 has a module efficiency of 23.70%, while Trina Solar TSM-635NEG19RC.20 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-NEG21C.20 735 use vs Trina Solar TSM-635NEG19RC.20?
Trina Solar TSM-NEG21C.20 735 uses TOPCon cells; Trina Solar TSM-635NEG19RC.20 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.20 735 and Trina Solar TSM-635NEG19RC.20?
Trina Solar TSM-NEG21C.20 735 has a 30 years power warranty; Trina Solar TSM-635NEG19RC.20 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.20 735 and Trina Solar TSM-635NEG19RC.20 bifacial panels?
Both Trina Solar TSM-NEG21C.20 735 and Trina Solar TSM-635NEG19RC.20 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 195 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.