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NEG21C.20-735 vs NEG9R.28 455W 5 of 19 identical Swap Change panels

Trina Solar TSM-NEG21C.20-735 vs Trina Solar TSM-NEG9R.28 455W

Trina Solar TSM-NEG21C.20-735
TSM-NEG21C.20-735
735 Wp 23.70 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Trina Solar TSM-NEG9R.28 455W
TSM-NEG9R.28 455W
455 Wp 22.80 % TOPCon
Open panel page Datasheet PDF
The verdict

NEG21C.20-735 leads on the differences that matter

The largest is module efficiency: 0.90 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.20-735 NEG9R.28 455W Difference
Module efficiency 23.70 % 22.80 % 0.90 pp more efficient
Rated power 735 Wp 455 Wp 280 W more power
Weight 38.3 kg 21.0 kg 17.3 kg lighter
Power density 236.6 Wp/m² 227.7 Wp/m² 8.9 Wp/m² higher
Product warranty 12 yrs 15 yrs 3 yrs longer
Weight per kWp 52.1 kg/kWp 46.2 kg/kWp 6.0 kg/kWp lighter
Short-circuit current 18.62 A 10.77 A 7.85 A apart
Module area 3.106 m² 1.998 m² 1.108 m² apart
Open-circuit voltage 50.10 V 53.40 V 3.30 V apart
Current at max power 17.55 A 10.11 A 7.44 A apart
Cell count 132 144 12 cells apart
Voltage at max power 41.90 V 45.00 V 3.10 V apart
Bifacial Yes No Yes vs No
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
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.
NEG21C.20-735
24,661 kWh
NEG9R.28 455W
15,266 kWh
Lifetime gap
9,395 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario NEG21C.20-735 NEG9R.28 455W
Standard test conditions 25 °C 100.0% of rated power 735 W 455 W
Cool, bright day 40 °C 95.7% of rated power 703 W 435 W
Typical summer roof 55 °C 91.3% of rated power 671 W 415 W
Hot roof 70 °C 87.0% of rated power 639 W 396 W
03

Full specification

Parameter NEG21C.20-735 NEG9R.28 455W Difference
Power and efficiency
Rated power 735 Wp 455 Wp +280 W for NEG21C.20-735
Module efficiency 23.70 % 22.80 % +0.90 pp for NEG21C.20-735
Power density 236.6 Wp/m² 227.7 Wp/m² +8.9 Wp/m² for NEG21C.20-735
Open-circuit voltage 50.10 V 53.40 V 3.30 V apart
Voltage at max power 41.90 V 45.00 V 3.10 V apart
Short-circuit current 18.62 A 10.77 A 7.85 A apart
Current at max power 17.55 A 10.11 A 7.44 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
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 NEG9R.28 455W
Weight per kWp 52.1 kg/kWp 46.2 kg/kWp -6.0 kg/kWp for NEG9R.28 455W
Warranty and degradation
Product warranty 12 yrs 15 yrs +3 yrs for NEG9R.28 455W
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 132 144 12 cells apart
Bifacial Yes No Yes vs No
04

Against the whole database

14,005 panels
Efficiency
#517 vs #2,714
NEG21C.20-735 leads by 2,197 places
Power density
#582 vs #2,888
NEG21C.20-735 leads by 2,306 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#5,576 vs #1,016
NEG9R.28 455W leads by 4,560 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#233 vs #7,730
NEG21C.20-735 leads by 7,497 places
05

More useful comparisons

Open the full database
Same series, other bin
Trina Solar TSM-NEG21C.20-735 vs Trina Solar TSM-NEG21C.20-740
The same specification on paper
Same series, other bin
Trina Solar TSM-NEG21C.20-735 vs Trina Solar TSM-NEG21C.20-730
One difference: module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20-735 vs Trina Solar TSM-NEG21C.20-725
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20-735 vs Trina Solar TSM-NEG21C.20-720
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20-735 vs Trina Solar TSM-NEG21C.20-715
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG9R.28 455W vs Trina Solar TSM-470NED9R.28
8 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Trina Solar TSM-NEG21C.20-735 or Trina Solar TSM-NEG9R.28 455W?
According to our database: Trina Solar TSM-NEG21C.20-735 has higher module efficiency (23.70% vs 22.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Trina Solar TSM-NEG21C.20-735 and Trina Solar TSM-NEG9R.28 455W?
Trina Solar TSM-NEG21C.20-735 has a module efficiency of 23.70%, while Trina Solar TSM-NEG9R.28 455 W is 22.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Trina Solar TSM-NEG21C.20-735 use vs Trina Solar TSM-NEG9R.28 455W?
Trina Solar TSM-NEG21C.20-735 uses TOPCon cells; Trina Solar TSM-NEG9R.28 455 W 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.20-735 and Trina Solar TSM-NEG9R.28 455W?
Trina Solar TSM-NEG21C.20-735 has a 30 years power warranty; Trina Solar TSM-NEG9R.28 455 W 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.20-735 and Trina Solar TSM-NEG9R.28 455W bifacial panels?
Trina Solar TSM-NEG21C.20-735 is bifacial (captures light from both faces); Trina Solar TSM-NEG9R.28 455 W is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

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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.