455NEG9R.28 vs NEG21C.20 725W 6 of 19 identical Swap Change panels

Trina Solar TSM-455NEG9R.28 vs Trina Solar TSM-NEG21C.20 725W

Q: Which panel is better: Trina Solar TSM-455NEG9R.28 or Trina Solar TSM-NEG21C.20 725W?

According to our database: Trina Solar TSM-NEG21C.20 725W has higher module efficiency (23.30% vs 22.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.

Q: What is the efficiency of Trina Solar TSM-455NEG9R.28 and Trina Solar TSM-NEG21C.20 725W?

Trina Solar TSM-455NEG9R.28 has a module efficiency of 22.80%, while Trina Solar TSM-NEG21C.20 725W is 23.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does Trina Solar TSM-455NEG9R.28 use vs Trina Solar TSM-NEG21C.20 725W?

Trina Solar TSM-455NEG9R.28 uses TOPCon cells; Trina Solar TSM-NEG21C.20 725W uses TOPCon. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.

Q: What is the warranty on Trina Solar TSM-455NEG9R.28 and Trina Solar TSM-NEG21C.20 725W?

Trina Solar TSM-455NEG9R.28 has a 30 years power warranty; Trina Solar TSM-NEG21C.20 725W 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.

Q: Are Trina Solar TSM-455NEG9R.28 and Trina Solar TSM-NEG21C.20 725W bifacial panels?

Both Trina Solar TSM-455NEG9R.28 and Trina Solar TSM-NEG21C.20 725W 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.

TSM-455NEG9R.28

455 Wp 22.80 % TOPCon Bifacial

Open panel page Datasheet PDF

TSM-NEG21C.20 725W

725 Wp 23.30 % TOPCon Bifacial

Open panel page Datasheet PDF

The verdict

13 differences, and they point both ways

The largest is rated power: 270 W more power. 6 of 19 comparable parameters are identical.

See all 13 differences

How alike are they

6 of 19 comparable
parameters are identical

identical differs

What actually differs

13 of 19 parameters

Parameter 455NEG9R.28 NEG21C.20 725W Difference

Rated power 455 Wp 725 Wp 270 W more power

Module efficiency 22.80 % 23.30 % 0.50 pp more efficient

Weight 21.0 kg 38.3 kg 17.3 kg lighter

Product warranty 25 yrs 12 yrs 13 yrs longer

Weight per kWp 46.2 kg/kWp 52.8 kg/kWp 6.7 kg/kWp lighter

Short-circuit current 10.77 A 18.54 A 7.77 A apart

Module area 1.998 m² 3.106 m² 1.108 m² apart

Open-circuit voltage 53.40 V 49.60 V 3.80 V apart

Power density 227.7 Wp/m² 233.4 Wp/m² 5.7 Wp/m² higher

Current at max power 10.11 A 17.47 A 7.36 A apart

Cell count 144 132 12 cells apart

Voltage at max power 45.00 V 41.50 V 3.50 V apart

Dimensions 1762x1134x30 mm 2384x1303x33 mm 1762x1134x30 mm vs 2384x1303x33 mm

What it means on a roof

Thirty years of production

Each panel's own declared degradation curve, at 1,200 kWh/kWp a year

Cell temperature

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.

455NEG9R.28

15,266 kWh

NEG21C.20 725W

24,325 kWh

Lifetime gap

9,059 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario 455NEG9R.28 NEG21C.20 725W

Standard test conditions 25 °C 100.0% of rated power 455 W 725 W

Cool, bright day 40 °C 95.7% of rated power 435 W 693 W

Typical summer roof 55 °C 91.3% of rated power 415 W 662 W

Hot roof 70 °C 87.0% of rated power 396 W 630 W

Full specification

Parameter 455NEG9R.28 NEG21C.20 725W Difference

Power and efficiency

Rated power 455 Wp 725 Wp +270 W for NEG21C.20 725W

Module efficiency 22.80 % 23.30 % +0.50 pp for NEG21C.20 725W

Power density 227.7 Wp/m² 233.4 Wp/m² +5.7 Wp/m² for NEG21C.20 725W

Open-circuit voltage 53.40 V 49.60 V 3.80 V apart

Voltage at max power 45.00 V 41.50 V 3.50 V apart

Short-circuit current 10.77 A 18.54 A 7.77 A apart

Current at max power 10.11 A 17.47 A 7.36 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 455NEG9R.28

Weight per kWp 46.2 kg/kWp 52.8 kg/kWp -6.7 kg/kWp for 455NEG9R.28

Warranty and degradation

Product warranty 25 yrs 12 yrs +13 yrs for 455NEG9R.28

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

Against the whole database

14,129 panels

Efficiency

#2,769 vs #1,057

NEG21C.20 725W leads by 1,712 places

Power density

#2,943 vs #974

NEG21C.20 725W leads by 1,969 places

Heat behaviour

#2,220 vs #2,220

Tied - the same position in the database

Weight

#1,016 vs #6,570

455NEG9R.28 leads by 5,554 places

Warranty

#21 vs #21

Tied - the same position in the database

Overall

#5,588 vs #431

NEG21C.20 725W leads by 5,157 places

More useful comparisons

Open the full database

Same series, other bin

Trina Solar TSM-455NEG9R.28 vs Trina Solar TSM-460NEG9R.28

One difference: module efficiency

Same series, other bin

Trina Solar TSM-455NEG9R.28 vs Trina Solar TSM-450NEG9R.28

One difference: module efficiency

Same series, other bin

Trina Solar TSM-455NEG9R.28 vs Trina Solar TSM-445NEG9R.28

3 differences, the largest is module efficiency

Same series, other bin

Trina Solar TSM-455NEG9R.28 vs Trina Solar TSM-440NEG9R.28

5 differences, the largest is module efficiency

Same series, other bin

Trina Solar TSM-455NEG9R.28 vs Trina Solar TSM-435NEG9R.28

6 differences, the largest is module efficiency

Same series, other bin

Trina Solar TSM-455NEG9R.28 vs Trina Solar TSM-430NEG9R.28

6 differences, the largest is module efficiency

Written summary

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Questions about this pairing

Which panel is better: Trina Solar TSM-455NEG9R.28 or Trina Solar TSM-NEG21C.20 725W?

According to our database: Trina Solar TSM-NEG21C.20 725 W has higher module efficiency (23.30% 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-455NEG9R.28 and Trina Solar TSM-NEG21C.20 725W?

Trina Solar TSM-455NEG9R.28 has a module efficiency of 22.80%, while Trina Solar TSM-NEG21C.20 725 W is 23.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

What cell technology does Trina Solar TSM-455NEG9R.28 use vs Trina Solar TSM-NEG21C.20 725W?

Trina Solar TSM-455NEG9R.28 uses TOPCon cells; Trina Solar TSM-NEG21C.20 725 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-455NEG9R.28 and Trina Solar TSM-NEG21C.20 725W?

Trina Solar TSM-455NEG9R.28 has a 30 years power warranty; Trina Solar TSM-NEG21C.20 725 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-455NEG9R.28 and Trina Solar TSM-NEG21C.20 725W bifacial panels?

Both Trina Solar TSM-455NEG9R.28 and Trina Solar TSM-NEG21C.20 725 W 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 189 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.