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NEG9RC.27-435 vs NEG21C.20-740 6 of 19 identical Swap Change panels

Trina Solar TSM-NEG9RC.27-435 vs Trina Solar TSM-NEG21C.20-740

Trina Solar TSM-NEG9RC.27-435
TSM-NEG9RC.27-435
435 Wp 21.80 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Trina Solar TSM-NEG21C.20-740
TSM-NEG21C.20-740
740 Wp 23.80 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

NEG21C.20-740 leads on the differences that matter

The largest is module efficiency: 2.00 pp more efficient. 6 of 19 comparable parameters are identical.

See all 13 differences
How alike are they
6 of 19 comparable
parameters are identical
identical differs
01

What actually differs

13 of 19 parameters
Parameter NEG9RC.27-435 NEG21C.20-740 Difference
Module efficiency 21.80 % 23.80 % 2.00 pp more efficient
Rated power 435 Wp 740 Wp 305 W more power
Power density 217.7 Wp/m² 238.2 Wp/m² 20.5 Wp/m² higher
Weight 21.0 kg 38.3 kg 17.3 kg lighter
Product warranty 15 yrs 12 yrs 3 yrs longer
Short-circuit current 10.64 A 18.66 A 8.02 A apart
Module area 1.998 m² 3.106 m² 1.108 m² apart
Weight per kWp 48.3 kg/kWp 51.8 kg/kWp 3.5 kg/kWp lighter
Current at max power 9.99 A 17.58 A 7.59 A apart
Cell count 144 132 12 cells apart
Open-circuit voltage 51.80 V 50.30 V 1.50 V apart
Dimensions 1762x1134x30 mm 2384x1303x33 mm 1762x1134x30 mm vs 2384x1303x33 mm
Voltage at max power 43.60 V 42.10 V 1.50 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.
NEG9RC.27-435
14,595 kWh
NEG21C.20-740
24,828 kWh
Lifetime gap
10,233 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario NEG9RC.27-435 NEG21C.20-740
Standard test conditions 25 °C 100.0% of rated power 435 W 740 W
Cool, bright day 40 °C 95.7% of rated power 416 W 708 W
Typical summer roof 55 °C 91.3% of rated power 397 W 676 W
Hot roof 70 °C 87.0% of rated power 378 W 643 W
03

Full specification

Parameter NEG9RC.27-435 NEG21C.20-740 Difference
Power and efficiency
Rated power 435 Wp 740 Wp +305 W for NEG21C.20-740
Module efficiency 21.80 % 23.80 % +2.00 pp for NEG21C.20-740
Power density 217.7 Wp/m² 238.2 Wp/m² +20.5 Wp/m² for NEG21C.20-740
Open-circuit voltage 51.80 V 50.30 V 1.50 V apart
Voltage at max power 43.60 V 42.10 V 1.50 V apart
Short-circuit current 10.64 A 18.66 A 8.02 A apart
Current at max power 9.99 A 17.58 A 7.59 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
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.27-435
Weight per kWp 48.3 kg/kWp 51.8 kg/kWp -3.5 kg/kWp for NEG9RC.27-435
Warranty and degradation
Product warranty 15 yrs 12 yrs +3 yrs for NEG9RC.27-435
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 144 132 12 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#7,022 vs #433
NEG21C.20-740 leads by 6,589 places
Power density
#7,066 vs #431
NEG21C.20-740 leads by 6,635 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#2,138 vs #5,125
NEG9RC.27-435 leads by 2,987 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#9,574 vs #185
NEG21C.20-740 leads by 9,389 places
05

More useful comparisons

Open the full database
Same series, other bin
Trina Solar TSM-NEG9RC.27-435 vs Trina Solar TSM-NEG9RC.27-450
5 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG9RC.27-435 vs Trina Solar TSM-NEG9RC.27-445
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG9RC.27-435 vs Trina Solar TSM-NEG9RC.27-440
One difference: module efficiency
Same series, other bin
Trina Solar TSM-NEG9RC.27-435 vs Trina Solar TSM-NEG9RC.27-430
One difference: module efficiency
Same series, other bin
Trina Solar TSM-NEG9RC.27-435 vs Trina Solar TSM-NEG9RC.27-425
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20-740 vs Trina Solar TSM-NEG21C.20-735
The same specification on paper
06

Written summary

07

Questions about this pairing

Which panel is better: Trina Solar TSM-NEG9RC.27-435 or Trina Solar TSM-NEG21C.20-740?
According to our database: Trina Solar TSM-NEG21C.20-740 has higher module efficiency (23.80% vs 21.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Trina Solar TSM-NEG9RC.27-435 and Trina Solar TSM-NEG21C.20-740?
Trina Solar TSM-NEG9RC.27-435 has a module efficiency of 21.80%, 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-NEG9RC.27-435 use vs Trina Solar TSM-NEG21C.20-740?
Trina Solar TSM-NEG9RC.27-435 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-NEG9RC.27-435 and Trina Solar TSM-NEG21C.20-740?
Trina Solar TSM-NEG9RC.27-435 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-NEG9RC.27-435 and Trina Solar TSM-NEG21C.20-740 bifacial panels?
Both Trina Solar TSM-NEG9RC.27-435 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 227 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.