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NEG9RC.27-450 vs NEG21C.20Q-755 4 of 19 identical Swap Change panels

Trina Solar TSM-NEG9RC.27-450 vs Trina Solar TSM-NEG21C.20Q-755

Trina Solar TSM-NEG9RC.27-450
TSM-NEG9RC.27-450
450 Wp 22.50 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Trina Solar TSM-NEG21C.20Q-755
TSM-NEG21C.20Q-755
755 Wp 24.30 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

NEG21C.20Q-755 leads on the differences that matter

The largest is module efficiency: 1.80 pp more efficient. 4 of 19 comparable parameters are identical.

See all 15 differences
How alike are they
4 of 19 comparable
parameters are identical
identical differs
01

What actually differs

15 of 19 parameters
Parameter NEG9RC.27-450 NEG21C.20Q-755 Difference
Module efficiency 22.50 % 24.30 % 1.80 pp more efficient
Rated power 450 Wp 755 Wp 305 W more power
Power density 225.2 Wp/m² 243.1 Wp/m² 17.8 Wp/m² higher
Temperature coefficient -0.290 %/°C -0.260 %/°C 0.030 %/°C better in heat
Weight 21.0 kg 38.3 kg 17.3 kg lighter
Product warranty 15 yrs 12 yrs 3 yrs longer
Short-circuit current 10.74 A 18.81 A 8.07 A apart
Module area 1.998 m² 3.106 m² 1.108 m² apart
Weight per kWp 46.7 kg/kWp 50.7 kg/kWp 4.1 kg/kWp lighter
Open-circuit voltage 52.90 V 50.70 V 2.20 V apart
Annual degradation 0.40 %/yr 0.35 %/yr 0.05 %/yr slower
Current at max power 10.09 A 17.69 A 7.60 A apart
Cell count 144 264 120 cells apart
Dimensions 1762x1134x30 mm 2384x1303x33 mm 1762x1134x30 mm vs 2384x1303x33 mm
Voltage at max power 44.60 V 42.70 V 1.90 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
NEG9RC.27-450
15,098 kWh
NEG21C.20Q-755
25,529 kWh
Lifetime gap
10,431 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario NEG9RC.27-450 NEG21C.20Q-755
Standard test conditions 25 °C 100.0% of rated power 450 W 755 W
Cool, bright day 40 °C 95.7% of rated power 430 W 726 W
Typical summer roof 55 °C 91.3% of rated power 411 W 696 W
Hot roof 70 °C 87.0% of rated power 391 W 667 W
03

Full specification

Parameter NEG9RC.27-450 NEG21C.20Q-755 Difference
Power and efficiency
Rated power 450 Wp 755 Wp +305 W for NEG21C.20Q-755
Module efficiency 22.50 % 24.30 % +1.80 pp for NEG21C.20Q-755
Power density 225.2 Wp/m² 243.1 Wp/m² +17.8 Wp/m² for NEG21C.20Q-755
Open-circuit voltage 52.90 V 50.70 V 2.20 V apart
Voltage at max power 44.60 V 42.70 V 1.90 V apart
Short-circuit current 10.74 A 18.81 A 8.07 A apart
Current at max power 10.09 A 17.69 A 7.60 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.260 %/°C +0.030 %/°C for NEG21C.20Q-755
Mechanical
Dimensions 1762x1134x30 mm 2384x1303x33 mm 1762x1134x30 mm vs 2384x1303x33 mm
Module area 1.998 m² 3.106 m² 1.108 m² apart
Weight 21.0 kg 38.3 kg -17.3 kg for NEG9RC.27-450
Weight per kWp 46.7 kg/kWp 50.7 kg/kWp -4.1 kg/kWp for NEG9RC.27-450
Warranty and degradation
Product warranty 15 yrs 12 yrs +3 yrs for NEG9RC.27-450
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.35 %/yr -0.05 %/yr for NEG21C.20Q-755
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 144 264 120 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#4,222 vs #131
NEG21C.20Q-755 leads by 4,091 places
Power density
#4,225 vs #136
NEG21C.20Q-755 leads by 4,089 places
Heat behaviour
#2,165 vs #511
NEG21C.20Q-755 leads by 1,654 places
Weight
#1,258 vs #4,131
NEG9RC.27-450 leads by 2,873 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#8,336 vs #91
NEG21C.20Q-755 leads by 8,245 places
05

More useful comparisons

Open the full database
Same series, other bin
Trina Solar TSM-NEG9RC.27-450 vs Trina Solar TSM-NEG9RC.27-445
One difference: module efficiency
Same series, other bin
Trina Solar TSM-NEG9RC.27-450 vs Trina Solar TSM-NEG9RC.27-440
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG9RC.27-450 vs Trina Solar TSM-NEG9RC.27-435
5 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG9RC.27-450 vs Trina Solar TSM-NEG9RC.27-430
6 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG9RC.27-450 vs Trina Solar TSM-NEG9RC.27-425
6 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20Q-755 vs Trina Solar TSM-NEG21C.20Q-760
One difference: module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Trina Solar TSM-NEG9RC.27-450 or Trina Solar TSM-NEG21C.20Q-755?
According to our database: Trina Solar TSM-NEG21C.20Q-755 has higher module efficiency (24.30% vs 22.50%); Trina Solar TSM-NEG21C.20Q-755 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-NEG9RC.27-450 and Trina Solar TSM-NEG21C.20Q-755?
Trina Solar TSM-NEG9RC.27-450 has a module efficiency of 22.50%, while Trina Solar TSM-NEG21C.20Q-755 is 24.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Trina Solar TSM-NEG9RC.27-450 use vs Trina Solar TSM-NEG21C.20Q-755?
Trina Solar TSM-NEG9RC.27-450 uses TOPCon cells; Trina Solar TSM-NEG21C.20Q-755 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-NEG9RC.27-450 and Trina Solar TSM-NEG21C.20Q-755?
Trina Solar TSM-NEG9RC.27-450 has a 30 years power warranty; Trina Solar TSM-NEG21C.20Q-755 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-NEG9RC.27-450 and Trina Solar TSM-NEG21C.20Q-755 bifacial panels?
Both Trina Solar TSM-NEG9RC.27-450 and Trina Solar TSM-NEG21C.20Q-755 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 252 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.