Trina Solar TSM-NEG19RC.20Q vs Trina Solar TSM-NEG21C.20-740
VS
The verdict
NEG19RC.20Q leads on the differences that matter
The largest is module efficiency: 1.00 pp more efficient. 7 of 19 comparable parameters are identical.
See all 12 differencesHow alike are they
7
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
12 of 19 parameters
What actually differs
Parameter
NEG19RC.20Q
NEG21C.20-740
Difference
Module efficiency
24.80 %
23.80 %
1.00 pp more efficient
Rated power
670 Wp
740 Wp
70 W more power
Temperature coefficient
-0.260 %/°C
-0.290 %/°C
0.030 %/°C better in heat
Power density
248.0 Wp/m²
238.2 Wp/m²
9.8 Wp/m² higher
Weight
33.0 kg
38.3 kg
5.3 kg lighter
Short-circuit current
16.60 A
18.66 A
2.06 A apart
Module area
2.701 m²
3.106 m²
0.405 m² apart
Annual degradation
0.35 %/yr
0.40 %/yr
0.05 %/yr slower
Cell count
264
132
132 cells apart
Weight per kWp
49.3 kg/kWp
51.8 kg/kWp
2.5 kg/kWp lighter
Current at max power
15.94 A
17.58 A
1.64 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
NEG19RC.20Q
22,655 kWh
NEG21C.20-740
24,828 kWh
Lifetime gap
2,173 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
NEG19RC.20Q
NEG21C.20-740
Standard test conditions
25 °C
100.0% of rated power
670 W
740 W
Cool, bright day
40 °C
95.7% of rated power
644 W
708 W
Typical summer roof
55 °C
91.3% of rated power
618 W
676 W
Hot roof
70 °C
87.0% of rated power
592 W
643 W
03
Full specification
Parameter
NEG19RC.20Q
NEG21C.20-740
Difference
Power and efficiency
Rated power
670 Wp
740 Wp
+70 W for NEG21C.20-740
Module efficiency
24.80 %
23.80 %
+1.00 pp for NEG19RC.20Q
Power density
248.0 Wp/m²
238.2 Wp/m²
+9.8 Wp/m² for NEG19RC.20Q
Open-circuit voltage
50.95 V
50.30 V
Effectively the same
Voltage at max power
42.04 V
42.10 V
Effectively the same
Short-circuit current
16.60 A
18.66 A
2.06 A apart
Current at max power
15.94 A
17.58 A
1.64 A apart
Temperature
Temperature coefficient
-0.260 %/°C
-0.290 %/°C
+0.030 %/°C for NEG19RC.20Q
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
51.8 kg/kWp
-2.5 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
0.40 %/yr
-0.05 %/yr for NEG19RC.20Q
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
264
132
132 cells apart
Bifacial
Yes
Yes
Same
04
14,129 panels
Against the whole database
Efficiency
#13
vs
#462
NEG19RC.20Q leads by 449 places
Power density
#15
vs
#460
NEG19RC.20Q leads by 445 places
Heat behaviour
#515
vs
#2,220
NEG19RC.20Q leads by 1,705 places
Weight
#2,832
vs
#5,156
NEG19RC.20Q leads by 2,324 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#497
vs
#185
NEG21C.20-740 leads by 312 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.20-740?
According to our database: Trina Solar TSM-NEG19RC.20Q has higher module efficiency (24.80% vs 23.80%); Trina Solar TSM-NEG19RC.20Q 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-NEG19RC.20Q and Trina Solar TSM-NEG21C.20-740?
Trina Solar TSM-NEG19RC.20Q has a module efficiency of 24.80%, 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-NEG19RC.20Q use vs Trina Solar TSM-NEG21C.20-740?
Trina Solar TSM-NEG19RC.20Q 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-NEG19RC.20Q and Trina Solar TSM-NEG21C.20-740?
Trina Solar TSM-NEG19RC.20Q 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-NEG19RC.20Q and Trina Solar TSM-NEG21C.20-740 bifacial panels?
Both Trina Solar TSM-NEG19RC.20Q 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 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.