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740 vs 715 14 of 19 identical Swap Change panels

Trina Solar TSM-NEG21C.20-740 vs Trina Solar TSM-NEG21C.20-715

Trina Solar TSM-NEG21C.20-740
TSM-NEG21C.20-740
740 Wp 23.80 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Trina Solar TSM-NEG21C.20-715
TSM-NEG21C.20-715
715 Wp 23.00 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

740 leads on the differences that matter

The largest is module efficiency: 0.80 pp more efficient. 14 of 19 comparable parameters are identical.

See all 5 differences
How alike are they
14 of 19 comparable
parameters are identical
identical differs
01

What actually differs

5 of 19 parameters
Parameter 740 715 Difference
Module efficiency 23.80 % 23.00 % 0.80 pp more efficient
Power density 238.2 Wp/m² 230.2 Wp/m² 8.0 Wp/m² higher
Rated power 740 Wp 715 Wp 25 W more power
Open-circuit voltage 50.30 V 49.20 V 1.10 V apart
Voltage at max power 42.10 V 41.10 V 1.00 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.
740
24,828 kWh
715
23,990 kWh
Lifetime gap
838 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 740 715
Standard test conditions 25 °C 100.0% of rated power 740 W 715 W
Cool, bright day 40 °C 95.7% of rated power 708 W 684 W
Typical summer roof 55 °C 91.3% of rated power 676 W 653 W
Hot roof 70 °C 87.0% of rated power 643 W 622 W
03

Full specification

Parameter 740 715 Difference
Power and efficiency
Rated power 740 Wp 715 Wp +25 W for 740
Module efficiency 23.80 % 23.00 % +0.80 pp for 740
Power density 238.2 Wp/m² 230.2 Wp/m² +8.0 Wp/m² for 740
Open-circuit voltage 50.30 V 49.20 V 1.10 V apart
Voltage at max power 42.10 V 41.10 V 1.00 V apart
Short-circuit current 18.66 A 18.44 A Effectively the same
Current at max power 17.58 A 17.40 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 38.3 kg Same
Weight per kWp 51.8 kg/kWp 53.6 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
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 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#433 vs #1,919
740 leads by 1,486 places
Power density
#431 vs #2,018
740 leads by 1,587 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#5,125 vs #7,566
740 leads by 2,441 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#185 vs #678
740 leads by 493 places
05

More useful comparisons

Open the full database
Same series, other bin
Trina Solar TSM-NEG21C.20-740 vs Trina Solar TSM-NEG21C.20-735
The same specification on paper
Same series, other bin
Trina Solar TSM-NEG21C.20-740 vs Trina Solar TSM-NEG21C.20-730
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20-740 vs Trina Solar TSM-NEG21C.20-725
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20-740 vs Trina Solar TSM-NEG21C.20-720
3 differences, the largest is module efficiency
Same manufacturer
Trina Solar TSM-NEG21C.20-740 vs Trina Solar TSM-NEG21C.20Q-760
6 differences, the largest is module efficiency
Same manufacturer
Trina Solar TSM-NEG21C.20-740 vs Trina Solar TSM-NEG21C.20Q-755
6 differences, the largest is temperature coefficient
06

Written summary

07

Questions about this pairing

Which panel is better: Trina Solar TSM-NEG21C.20-740 or Trina Solar TSM-NEG21C.20-715?
According to our database: Trina Solar TSM-NEG21C.20-740 has higher module efficiency (23.80% vs 23.00%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Trina Solar TSM-NEG21C.20-740 and Trina Solar TSM-NEG21C.20-715?
Trina Solar TSM-NEG21C.20-740 has a module efficiency of 23.80%, while Trina Solar TSM-NEG21C.20-715 is 23.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Trina Solar TSM-NEG21C.20-740 use vs Trina Solar TSM-NEG21C.20-715?
Trina Solar TSM-NEG21C.20-740 uses TOPCon cells; Trina Solar TSM-NEG21C.20-715 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.20-740 and Trina Solar TSM-NEG21C.20-715?
Trina Solar TSM-NEG21C.20-740 has a 30 years power warranty; Trina Solar TSM-NEG21C.20-715 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.20-740 and Trina Solar TSM-NEG21C.20-715 bifacial panels?
Both Trina Solar TSM-NEG21C.20-740 and Trina Solar TSM-NEG21C.20-715 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.

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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.