NEG21C.20 725W vs 435NEG9R.28 6 of 19 identical Swap Change panels

Trina Solar TSM-NEG21C.20 725W vs Trina Solar TSM-435NEG9R.28

Q: Which panel is better: Trina Solar TSM-NEG21C.20 725W or Trina Solar TSM-435NEG9R.28?

According to our database: Trina Solar TSM-NEG21C.20 725W has higher module efficiency (23.30% vs 21.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.

Q: What is the efficiency of Trina Solar TSM-NEG21C.20 725W and Trina Solar TSM-435NEG9R.28?

Trina Solar TSM-NEG21C.20 725W has a module efficiency of 23.30%, while Trina Solar TSM-435NEG9R.28 is 21.80%. 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 725W use vs Trina Solar TSM-435NEG9R.28?

Trina Solar TSM-NEG21C.20 725W uses TOPCon cells; Trina Solar TSM-435NEG9R.28 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 725W and Trina Solar TSM-435NEG9R.28?

Trina Solar TSM-NEG21C.20 725W has a 30 years power warranty; Trina Solar TSM-435NEG9R.28 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-NEG21C.20 725W and Trina Solar TSM-435NEG9R.28 bifacial panels?

Both Trina Solar TSM-NEG21C.20 725W and Trina Solar TSM-435NEG9R.28 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-NEG21C.20 725W

725 Wp 23.30 % TOPCon Bifacial

Open panel page Datasheet PDF

TSM-435NEG9R.28

435 Wp 21.80 % TOPCon Bifacial

Open panel page Datasheet PDF

The verdict

NEG21C.20 725W leads on the differences that matter

The largest is module efficiency: 1.50 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

What actually differs

13 of 19 parameters

Parameter NEG21C.20 725W 435NEG9R.28 Difference

Module efficiency 23.30 % 21.80 % 1.50 pp more efficient

Rated power 725 Wp 435 Wp 290 W more power

Power density 233.4 Wp/m² 217.7 Wp/m² 15.7 Wp/m² higher

Weight 38.3 kg 21.0 kg 17.3 kg lighter

Product warranty 12 yrs 25 yrs 13 yrs longer

Short-circuit current 18.54 A 10.64 A 7.90 A apart

Module area 3.106 m² 1.998 m² 1.108 m² apart

Weight per kWp 52.8 kg/kWp 48.3 kg/kWp 4.6 kg/kWp lighter

Open-circuit voltage 49.60 V 51.80 V 2.20 V apart

Current at max power 17.47 A 9.99 A 7.48 A apart

Cell count 132 144 12 cells apart

Voltage at max power 41.50 V 43.60 V 2.10 V apart

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

NEG21C.20 725W

24,325 kWh

435NEG9R.28

14,595 kWh

Lifetime gap

9,730 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario NEG21C.20 725W 435NEG9R.28

Standard test conditions 25 °C 100.0% of rated power 725 W 435 W

Cool, bright day 40 °C 95.7% of rated power 693 W 416 W

Typical summer roof 55 °C 91.3% of rated power 662 W 397 W

Hot roof 70 °C 87.0% of rated power 630 W 378 W

Full specification

Parameter NEG21C.20 725W 435NEG9R.28 Difference

Power and efficiency

Rated power 725 Wp 435 Wp +290 W for NEG21C.20 725W

Module efficiency 23.30 % 21.80 % +1.50 pp for NEG21C.20 725W

Power density 233.4 Wp/m² 217.7 Wp/m² +15.7 Wp/m² for NEG21C.20 725W

Open-circuit voltage 49.60 V 51.80 V 2.20 V apart

Voltage at max power 41.50 V 43.60 V 2.10 V apart

Short-circuit current 18.54 A 10.64 A 7.90 A apart

Current at max power 17.47 A 9.99 A 7.48 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 435NEG9R.28

Weight per kWp 52.8 kg/kWp 48.3 kg/kWp -4.6 kg/kWp for 435NEG9R.28

Warranty and degradation

Product warranty 12 yrs 25 yrs +13 yrs for 435NEG9R.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 132 144 12 cells apart

Bifacial Yes Yes Same

Against the whole database

14,129 panels

Efficiency

#1,057 vs #7,085

NEG21C.20 725W leads by 6,028 places

Power density

#974 vs #7,129

NEG21C.20 725W leads by 6,155 places

Heat behaviour

#2,220 vs #2,220

Tied - the same position in the database

Weight

#6,570 vs #2,142

435NEG9R.28 leads by 4,428 places

Warranty

#21 vs #21

Tied - the same position in the database

Overall

#431 vs #7,586

NEG21C.20 725W leads by 7,155 places

More useful comparisons

Open the full database

Same series, other bin

Trina Solar TSM-NEG21C.20 725W vs Trina Solar TSM-460NEG9R.28

13 differences, the largest is rated power

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

13 differences, the largest is rated power

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Trina Solar TSM-NEG21C.20 725W vs Trina Solar TSM-450NEG9R.28

13 differences, the largest is module efficiency

Same series, other bin

Trina Solar TSM-NEG21C.20 725W vs Trina Solar TSM-445NEG9R.28

13 differences, the largest is module efficiency

Same series, other bin

Trina Solar TSM-NEG21C.20 725W vs Trina Solar TSM-440NEG9R.28

13 differences, the largest is module efficiency

Same series, other bin

Trina Solar TSM-NEG21C.20 725W vs Trina Solar TSM-430NEG9R.28

13 differences, the largest is module efficiency

Written summary

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Questions about this pairing

Which panel is better: Trina Solar TSM-NEG21C.20 725W or Trina Solar TSM-435NEG9R.28?

According to our database: Trina Solar TSM-NEG21C.20 725 W has higher module efficiency (23.30% 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-NEG21C.20 725W and Trina Solar TSM-435NEG9R.28?

Trina Solar TSM-NEG21C.20 725 W has a module efficiency of 23.30%, while Trina Solar TSM-435NEG9R.28 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.20 725W use vs Trina Solar TSM-435NEG9R.28?

Trina Solar TSM-NEG21C.20 725 W uses TOPCon cells; Trina Solar TSM-435NEG9R.28 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 725W and Trina Solar TSM-435NEG9R.28?

Trina Solar TSM-NEG21C.20 725 W has a 30 years power warranty; Trina Solar TSM-435NEG9R.28 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 725W and Trina Solar TSM-435NEG9R.28 bifacial panels?

Both Trina Solar TSM-NEG21C.20 725 W and Trina Solar TSM-435NEG9R.28 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.