Trina Solar TSM-NEG19RC.20Q vs Trina Solar TSM-NEG21C.20Q-745
VS
The verdict
NEG19RC.20Q leads on the differences that matter
The largest is module efficiency: 0.80 pp more efficient. 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
NEG19RC.20Q
NEG21C.20Q-745
Difference
Module efficiency
24.80 %
24.00 %
0.80 pp more efficient
Rated power
670 Wp
745 Wp
75 W more power
Weight
33.0 kg
38.3 kg
5.3 kg lighter
Power density
248.0 Wp/m²
239.8 Wp/m²
8.2 Wp/m² higher
Short-circuit current
16.60 A
18.73 A
2.13 A apart
Module area
2.701 m²
3.106 m²
0.405 m² apart
Current at max power
15.94 A
17.62 A
1.68 A apart
Weight per kWp
49.3 kg/kWp
51.4 kg/kWp
2.2 kg/kWp lighter
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 (-0.260 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
NEG19RC.20Q
22,655 kWh
NEG21C.20Q-745
25,191 kWh
Lifetime gap
2,536 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
NEG19RC.20Q
NEG21C.20Q-745
Standard test conditions
25 °C
100.0% of rated power
670 W
745 W
Cool, bright day
40 °C
96.1% of rated power
644 W
716 W
Typical summer roof
55 °C
92.2% of rated power
618 W
687 W
Hot roof
70 °C
88.3% of rated power
592 W
658 W
03
Full specification
Parameter
NEG19RC.20Q
NEG21C.20Q-745
Difference
Power and efficiency
Rated power
670 Wp
745 Wp
+75 W for NEG21C.20Q-745
Module efficiency
24.80 %
24.00 %
+0.80 pp for NEG19RC.20Q
Power density
248.0 Wp/m²
239.8 Wp/m²
+8.2 Wp/m² for NEG19RC.20Q
Open-circuit voltage
50.95 V
50.30 V
Effectively the same
Voltage at max power
42.04 V
42.30 V
Effectively the same
Short-circuit current
16.60 A
18.73 A
2.13 A apart
Current at max power
15.94 A
17.62 A
1.68 A apart
Temperature
Temperature coefficient
-0.260 %/°C
-0.260 %/°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 NEG19RC.20Q
Weight per kWp
49.3 kg/kWp
51.4 kg/kWp
-2.2 kg/kWp for NEG19RC.20Q
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.35 %/yr
0.35 %/yr
Same
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
264
264
Same
Bifacial
Yes
Yes
Same
04
14,129 panels
Against the whole database
Efficiency
#13
vs
#329
NEG19RC.20Q leads by 316 places
Power density
#15
vs
#366
NEG19RC.20Q leads by 351 places
Heat behaviour
#515
vs
#515
Tied - the same position in the database
Weight
#2,832
vs
#4,829
NEG19RC.20Q leads by 1,997 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#497
vs
#150
NEG21C.20Q-745 leads by 347 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-NEG19RC.20Q or Trina Solar TSM-NEG21C.20Q-745?
According to our database: Trina Solar TSM-NEG19RC.20Q has higher module efficiency (24.80% vs 24.00%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Trina Solar TSM-NEG19RC.20Q and Trina Solar TSM-NEG21C.20Q-745?
Trina Solar TSM-NEG19RC.20Q has a module efficiency of 24.80%, while Trina Solar TSM-NEG21C.20Q-745 is 24.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Trina Solar TSM-NEG19RC.20Q use vs Trina Solar TSM-NEG21C.20Q-745?
Trina Solar TSM-NEG19RC.20Q uses TOPCon cells; Trina Solar TSM-NEG21C.20Q-745 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-NEG19RC.20Q and Trina Solar TSM-NEG21C.20Q-745?
Trina Solar TSM-NEG19RC.20Q has a 30 years power warranty; Trina Solar TSM-NEG21C.20Q-745 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-NEG19RC.20Q and Trina Solar TSM-NEG21C.20Q-745 bifacial panels?
Both Trina Solar TSM-NEG19RC.20Q and Trina Solar TSM-NEG21C.20Q-745 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 194 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.