NEG21C.20-730 vs NE21 725W 14 of 19 identical Swap Change panels

Trina Solar TSM-NEG21C.20-730 vs Trina Solar TSM-NE21 725W

Q: Which panel is better: Trina Solar TSM-NEG21C.20-730 or Trina Solar TSM-NE21 725W?

According to our database: Trina Solar TSM-NEG21C.20-730 has higher module efficiency (23.50% vs 23.30%). See the full spec comparison and 30-year energy simulation above for a complete picture.

Q: What is the efficiency of Trina Solar TSM-NEG21C.20-730 and Trina Solar TSM-NE21 725W?

Trina Solar TSM-NEG21C.20-730 has a module efficiency of 23.50%, while Trina Solar TSM-NE21 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-NEG21C.20-730 use vs Trina Solar TSM-NE21 725W?

Trina Solar TSM-NEG21C.20-730 uses TOPCon cells; Trina Solar TSM-NE21 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-NEG21C.20-730 and Trina Solar TSM-NE21 725W?

Trina Solar TSM-NEG21C.20-730 has a 30 years power warranty; Trina Solar TSM-NE21 725W has a 25 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-NEG21C.20-730 and Trina Solar TSM-NE21 725W bifacial panels?

Trina Solar TSM-NEG21C.20-730 is bifacial (captures light from both faces); Trina Solar TSM-NE21 725W is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

TSM-NEG21C.20-730

730 Wp 23.50 % TOPCon Bifacial

Open panel page Datasheet PDF

TSM-NE21 725W

725 Wp 23.30 % TOPCon

Open panel page Datasheet PDF

The verdict

5 differences, and they point both ways

The largest is performance warranty: 5 yrs longer. 14 of 19 comparable parameters are identical.

See all 5 differences

How alike are they

14 of 19 comparable
parameters are identical

identical differs

What actually differs

5 of 19 parameters

Parameter NEG21C.20-730 NE21 725W Difference

Performance warranty 30 yrs 25 yrs 5 yrs longer

Weight 38.3 kg 32.9 kg 5.4 kg lighter

Weight per kWp 52.5 kg/kWp 45.4 kg/kWp 7.1 kg/kWp lighter

Module efficiency 23.50 % 23.30 % 0.20 pp more efficient

Bifacial Yes No Yes vs No

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.

NEG21C.20-730

24,493 kWh

NE21 725W

24,325 kWh

Lifetime gap

168 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario NEG21C.20-730 NE21 725W

Standard test conditions 25 °C 100.0% of rated power 730 W 725 W

Cool, bright day 40 °C 95.7% of rated power 698 W 693 W

Typical summer roof 55 °C 91.3% of rated power 666 W 662 W

Hot roof 70 °C 87.0% of rated power 635 W 630 W

Full specification

Parameter NEG21C.20-730 NE21 725W Difference

Power and efficiency

Rated power 730 Wp 725 Wp Effectively the same

Module efficiency 23.50 % 23.30 % +0.20 pp for NEG21C.20-730

Power density 235.0 Wp/m² 233.4 Wp/m² Effectively the same

Open-circuit voltage 49.90 V 49.70 V Effectively the same

Voltage at max power 41.70 V 41.50 V Effectively the same

Short-circuit current 18.58 A 18.49 A Effectively the same

Current at max power 17.51 A 17.47 A Effectively the same

Temperature

Temperature coefficient -0.290 %/°C -0.290 %/°C Same

Mechanical

Dimensions 2384x1303x33 mm 2384x1303x33 mm Same

Module area 3.106 m² 3.106 m² Same

Weight 38.3 kg 32.9 kg -5.4 kg for NE21 725W

Weight per kWp 52.5 kg/kWp 45.4 kg/kWp -7.1 kg/kWp for NE21 725W

Warranty and degradation

Product warranty 12 yrs 12 yrs Same

Performance warranty 30 yrs 25 yrs +5 yrs for NEG21C.20-730

Annual degradation 0.40 %/yr 0.40 %/yr Same

Technology

Cell technology TOPCon TOPCon Same

Cell type Monocrystalline Monocrystalline Same

Cell count 132 132 Same

Bifacial Yes No Yes vs No

Against the whole database

14,005 panels

Efficiency

#716 vs #1,017

NEG21C.20-730 leads by 301 places

Power density

#800 vs #936

NEG21C.20-730 leads by 136 places

Heat behaviour

#2,165 vs #2,165

Tied - the same position in the database

Weight

#5,993 vs #717

NE21 725W leads by 5,276 places

Warranty

#21 vs #9,798

NEG21C.20-730 leads by 9,777 places

Overall

#312 vs #794

NEG21C.20-730 leads by 482 places

More useful comparisons

Open the full database

Same series, other bin

Trina Solar TSM-NEG21C.20-730 vs Trina Solar TSM-NEG21C.20-740

3 differences, the largest is module efficiency

Same series, other bin

Trina Solar TSM-NEG21C.20-730 vs Trina Solar TSM-NEG21C.20-735

One difference: module efficiency

Same series, other bin

Trina Solar TSM-NEG21C.20-730 vs Trina Solar TSM-NEG21C.20-725

One difference: module efficiency

Same series, other bin

Trina Solar TSM-NEG21C.20-730 vs Trina Solar TSM-NEG21C.20-720

3 differences, the largest is module efficiency

Same series, other bin

Trina Solar TSM-NEG21C.20-730 vs Trina Solar TSM-NEG21C.20-715

3 differences, the largest is module efficiency

Same series, other bin

Trina Solar TSM-NE21 725W vs Trina Solar TSM-NE21 720W

The same specification on paper

Written summary

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Questions about this pairing

Which panel is better: Trina Solar TSM-NEG21C.20-730 or Trina Solar TSM-NE21 725W?

According to our database: Trina Solar TSM-NEG21C.20-730 has higher module efficiency (23.50% vs 23.30%). See the full spec comparison and 30-year energy simulation above for a complete picture.

What is the efficiency of Trina Solar TSM-NEG21C.20-730 and Trina Solar TSM-NE21 725W?

Trina Solar TSM-NEG21C.20-730 has a module efficiency of 23.50%, while Trina Solar TSM-NE21 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-NEG21C.20-730 use vs Trina Solar TSM-NE21 725W?

Trina Solar TSM-NEG21C.20-730 uses TOPCon cells; Trina Solar TSM-NE21 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-NEG21C.20-730 and Trina Solar TSM-NE21 725W?

Trina Solar TSM-NEG21C.20-730 has a 30 years power warranty; Trina Solar TSM-NE21 725 W has a 25 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.20-730 and Trina Solar TSM-NE21 725W bifacial panels?

Trina Solar TSM-NEG21C.20-730 is bifacial (captures light from both faces); Trina Solar TSM-NE21 725 W is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

Shop prices: See 241 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.