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NE21 720W vs NEG21C.20-740 12 of 19 identical Swap Change panels

Trina Solar TSM-NE21 720W vs Trina Solar TSM-NEG21C.20-740

Trina Solar TSM-NE21 720W
TSM-NE21 720W
720 Wp 23.20 % TOPCon
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 performance warranty: 5 yrs longer. 12 of 19 comparable parameters are identical.

See all 7 differences
How alike are they
12 of 19 comparable
parameters are identical
identical differs
01

What actually differs

7 of 19 parameters
Parameter NE21 720W NEG21C.20-740 Difference
Performance warranty 25 yrs 30 yrs 5 yrs longer
Module efficiency 23.20 % 23.80 % 0.60 pp more efficient
Weight 32.9 kg 38.3 kg 5.4 kg lighter
Weight per kWp 45.7 kg/kWp 51.8 kg/kWp 6.1 kg/kWp lighter
Power density 231.8 Wp/m² 238.2 Wp/m² 6.4 Wp/m² higher
Rated power 720 Wp 740 Wp 20 W more power
Bifacial No Yes No vs Yes
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.
NE21 720W
24,157 kWh
NEG21C.20-740
24,828 kWh
Lifetime gap
671 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario NE21 720W NEG21C.20-740
Standard test conditions 25 °C 100.0% of rated power 720 W 740 W
Cool, bright day 40 °C 95.7% of rated power 689 W 708 W
Typical summer roof 55 °C 91.3% of rated power 657 W 676 W
Hot roof 70 °C 87.0% of rated power 626 W 643 W
03

Full specification

Parameter NE21 720W NEG21C.20-740 Difference
Power and efficiency
Rated power 720 Wp 740 Wp +20 W for NEG21C.20-740
Module efficiency 23.20 % 23.80 % +0.60 pp for NEG21C.20-740
Power density 231.8 Wp/m² 238.2 Wp/m² +6.4 Wp/m² for NEG21C.20-740
Open-circuit voltage 49.40 V 50.30 V Effectively the same
Voltage at max power 41.30 V 42.10 V Effectively the same
Short-circuit current 18.48 A 18.66 A Effectively the same
Current at max power 17.44 A 17.58 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 32.9 kg 38.3 kg -5.4 kg for NE21 720W
Weight per kWp 45.7 kg/kWp 51.8 kg/kWp -6.1 kg/kWp for NE21 720W
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 25 yrs 30 yrs +5 yrs for NEG21C.20-740
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 No Yes No vs Yes
04

Against the whole database

14,005 panels
Efficiency
#1,306 vs #433
NEG21C.20-740 leads by 873 places
Power density
#1,347 vs #431
NEG21C.20-740 leads by 916 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#845 vs #5,125
NE21 720W leads by 4,280 places
Warranty
#9,798 vs #21
NEG21C.20-740 leads by 9,777 places
Overall
#968 vs #185
NEG21C.20-740 leads by 783 places
05

More useful comparisons

Open the full database
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The same specification on paper
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Trina Solar TSM-NE21 720W vs Trina Solar TSM-NE21 715W
One difference: module efficiency
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Trina Solar TSM-NE21 720W vs Trina Solar TSM-NE21 710W
3 differences, the largest is module efficiency
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Trina Solar TSM-NE21 720W vs Trina Solar TSM-NE21 705W
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NE21 720W vs Trina Solar TSM-NE21 700W
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NE21 720W vs Trina Solar TSM-NE21 695W
5 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Trina Solar TSM-NE21 720W or Trina Solar TSM-NEG21C.20-740?
According to our database: Trina Solar TSM-NEG21C.20-740 has higher module efficiency (23.80% vs 23.20%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Trina Solar TSM-NE21 720W and Trina Solar TSM-NEG21C.20-740?
Trina Solar TSM-NE21 720 W has a module efficiency of 23.20%, 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-NE21 720W use vs Trina Solar TSM-NEG21C.20-740?
Trina Solar TSM-NE21 720 W 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-NE21 720W and Trina Solar TSM-NEG21C.20-740?
Trina Solar TSM-NE21 720 W has a 25 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-NE21 720W and Trina Solar TSM-NEG21C.20-740 bifacial panels?
Trina Solar TSM-NEG21C.20-740 is bifacial (captures light from both faces); Trina Solar TSM-NE21 720 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.