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NE21 710W vs NEG21C.20-740 10 of 19 identical Swap Change panels

Trina Solar TSM-NE21 710W vs Trina Solar TSM-NEG21C.20-740

Trina Solar TSM-NE21 710W
TSM-NE21 710W
710 Wp 22.90 % 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 module efficiency: 0.90 pp more efficient. 10 of 19 comparable parameters are identical.

See all 9 differences
How alike are they
10 of 19 comparable
parameters are identical
identical differs
01

What actually differs

9 of 19 parameters
Parameter NE21 710W NEG21C.20-740 Difference
Module efficiency 22.90 % 23.80 % 0.90 pp more efficient
Performance warranty 25 yrs 30 yrs 5 yrs longer
Power density 228.6 Wp/m² 238.2 Wp/m² 9.7 Wp/m² higher
Rated power 710 Wp 740 Wp 30 W more power
Weight 32.9 kg 38.3 kg 5.4 kg lighter
Weight per kWp 46.3 kg/kWp 51.8 kg/kWp 5.4 kg/kWp lighter
Bifacial No Yes No vs Yes
Open-circuit voltage 49.00 V 50.30 V 1.30 V apart
Voltage at max power 40.90 V 42.10 V 1.20 V apart
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 710W
23,822 kWh
NEG21C.20-740
24,828 kWh
Lifetime gap
1,006 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario NE21 710W NEG21C.20-740
Standard test conditions 25 °C 100.0% of rated power 710 W 740 W
Cool, bright day 40 °C 95.7% of rated power 679 W 708 W
Typical summer roof 55 °C 91.3% of rated power 648 W 676 W
Hot roof 70 °C 87.0% of rated power 617 W 643 W
03

Full specification

Parameter NE21 710W NEG21C.20-740 Difference
Power and efficiency
Rated power 710 Wp 740 Wp +30 W for NEG21C.20-740
Module efficiency 22.90 % 23.80 % +0.90 pp for NEG21C.20-740
Power density 228.6 Wp/m² 238.2 Wp/m² +9.7 Wp/m² for NEG21C.20-740
Open-circuit voltage 49.00 V 50.30 V 1.30 V apart
Voltage at max power 40.90 V 42.10 V 1.20 V apart
Short-circuit current 18.40 A 18.66 A Effectively the same
Current at max power 17.36 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 710W
Weight per kWp 46.3 kg/kWp 51.8 kg/kWp -5.4 kg/kWp for NE21 710W
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
#2,359 vs #433
NEG21C.20-740 leads by 1,926 places
Power density
#2,474 vs #431
NEG21C.20-740 leads by 2,043 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#1,119 vs #5,125
NE21 710W leads by 4,006 places
Warranty
#9,798 vs #21
NEG21C.20-740 leads by 9,777 places
Overall
#1,297 vs #185
NEG21C.20-740 leads by 1,112 places
05

More useful comparisons

Open the full database
Same series, other bin
Trina Solar TSM-NE21 710W vs Trina Solar TSM-NE21 725W
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NE21 710W vs Trina Solar TSM-NE21 720W
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NE21 710W vs Trina Solar TSM-NE21 715W
The same specification on paper
Same series, other bin
Trina Solar TSM-NE21 710W vs Trina Solar TSM-NE21 705W
One difference: module efficiency
Same series, other bin
Trina Solar TSM-NE21 710W vs Trina Solar TSM-NE21 700W
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NE21 710W vs Trina Solar TSM-NE21 695W
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Trina Solar TSM-NE21 710W or Trina Solar TSM-NEG21C.20-740?
According to our database: Trina Solar TSM-NEG21C.20-740 has higher module efficiency (23.80% vs 22.90%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Trina Solar TSM-NE21 710W and Trina Solar TSM-NEG21C.20-740?
Trina Solar TSM-NE21 710 W has a module efficiency of 22.90%, 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 710W use vs Trina Solar TSM-NEG21C.20-740?
Trina Solar TSM-NE21 710 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 710W and Trina Solar TSM-NEG21C.20-740?
Trina Solar TSM-NE21 710 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 710W 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 710 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.