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NEG21C.20Q-755 vs NEG9RC.27-435 5 of 19 identical Swap Change panels

Trina Solar TSM-NEG21C.20Q-755 vs Trina Solar TSM-NEG9RC.27-435

Trina Solar TSM-NEG21C.20Q-755
TSM-NEG21C.20Q-755
755 Wp 24.30 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Trina Solar TSM-NEG9RC.27-435
TSM-NEG9RC.27-435
435 Wp 21.80 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

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

The largest is module efficiency: 2.50 pp more efficient. 5 of 19 comparable parameters are identical.

See all 14 differences
How alike are they
5 of 19 comparable
parameters are identical
identical differs
01

What actually differs

14 of 19 parameters
Parameter NEG21C.20Q-755 NEG9RC.27-435 Difference
Module efficiency 24.30 % 21.80 % 2.50 pp more efficient
Rated power 755 Wp 435 Wp 320 W more power
Power density 243.1 Wp/m² 217.7 Wp/m² 25.3 Wp/m² higher
Temperature coefficient -0.260 %/°C -0.290 %/°C 0.030 %/°C better in heat
Weight 38.3 kg 21.0 kg 17.3 kg lighter
Product warranty 12 yrs 15 yrs 3 yrs longer
Short-circuit current 18.81 A 10.64 A 8.17 A apart
Module area 3.106 m² 1.998 m² 1.108 m² apart
Annual degradation 0.35 %/yr 0.40 %/yr 0.05 %/yr slower
Current at max power 17.69 A 9.99 A 7.70 A apart
Cell count 264 144 120 cells apart
Weight per kWp 50.7 kg/kWp 48.3 kg/kWp 2.5 kg/kWp lighter
Open-circuit voltage 50.70 V 51.80 V 1.10 V apart
Dimensions 2384x1303x33 mm 1762x1134x30 mm 2384x1303x33 mm vs 1762x1134x30 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
NEG21C.20Q-755
25,529 kWh
NEG9RC.27-435
14,595 kWh
Lifetime gap
10,934 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario NEG21C.20Q-755 NEG9RC.27-435
Standard test conditions 25 °C 100.0% of rated power 755 W 435 W
Cool, bright day 40 °C 95.7% of rated power 726 W 416 W
Typical summer roof 55 °C 91.3% of rated power 696 W 397 W
Hot roof 70 °C 87.0% of rated power 667 W 378 W
03

Full specification

Parameter NEG21C.20Q-755 NEG9RC.27-435 Difference
Power and efficiency
Rated power 755 Wp 435 Wp +320 W for NEG21C.20Q-755
Module efficiency 24.30 % 21.80 % +2.50 pp for NEG21C.20Q-755
Power density 243.1 Wp/m² 217.7 Wp/m² +25.3 Wp/m² for NEG21C.20Q-755
Open-circuit voltage 50.70 V 51.80 V 1.10 V apart
Voltage at max power 42.70 V 43.60 V Effectively the same
Short-circuit current 18.81 A 10.64 A 8.17 A apart
Current at max power 17.69 A 9.99 A 7.70 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.290 %/°C +0.030 %/°C for NEG21C.20Q-755
Mechanical
Dimensions 2384x1303x33 mm 1762x1134x30 mm 2384x1303x33 mm vs 1762x1134x30 mm
Module area 3.106 m² 1.998 m² 1.108 m² apart
Weight 38.3 kg 21.0 kg -17.3 kg for NEG9RC.27-435
Weight per kWp 50.7 kg/kWp 48.3 kg/kWp -2.5 kg/kWp for NEG9RC.27-435
Warranty and degradation
Product warranty 12 yrs 15 yrs +3 yrs for NEG9RC.27-435
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.35 %/yr 0.40 %/yr -0.05 %/yr for NEG21C.20Q-755
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 264 144 120 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#131 vs #7,022
NEG21C.20Q-755 leads by 6,891 places
Power density
#136 vs #7,066
NEG21C.20Q-755 leads by 6,930 places
Heat behaviour
#511 vs #2,165
NEG21C.20Q-755 leads by 1,654 places
Weight
#4,131 vs #2,138
NEG9RC.27-435 leads by 1,993 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#91 vs #9,574
NEG21C.20Q-755 leads by 9,483 places
05

More useful comparisons

Open the full database
Same series, other bin
Trina Solar TSM-NEG21C.20Q-755 vs Trina Solar TSM-NEG21C.20Q-760
One difference: module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20Q-755 vs Trina Solar TSM-NEG21C.20Q-750
One difference: module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20Q-755 vs Trina Solar TSM-NEG21C.20Q-745
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20Q-755 vs Trina Solar TSM-NEG21C.20Q-740
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20Q-755 vs Trina Solar TSM-NEG21C.20Q-735
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20Q-755 vs Trina Solar TSM-NEG19RC.20Q
8 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Trina Solar TSM-NEG21C.20Q-755 or Trina Solar TSM-NEG9RC.27-435?
According to our database: Trina Solar TSM-NEG21C.20Q-755 has higher module efficiency (24.30% vs 21.80%); 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-NEG21C.20Q-755 and Trina Solar TSM-NEG9RC.27-435?
Trina Solar TSM-NEG21C.20Q-755 has a module efficiency of 24.30%, while Trina Solar TSM-NEG9RC.27-435 is 21.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Trina Solar TSM-NEG21C.20Q-755 use vs Trina Solar TSM-NEG9RC.27-435?
Trina Solar TSM-NEG21C.20Q-755 uses TOPCon cells; Trina Solar TSM-NEG9RC.27-435 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.20Q-755 and Trina Solar TSM-NEG9RC.27-435?
Trina Solar TSM-NEG21C.20Q-755 has a 30 years power warranty; Trina Solar TSM-NEG9RC.27-435 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.20Q-755 and Trina Solar TSM-NEG9RC.27-435 bifacial panels?
Both Trina Solar TSM-NEG21C.20Q-755 and Trina Solar TSM-NEG9RC.27-435 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.

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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.