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20-720W vs 20Q-740 13 of 19 identical Swap Change panels

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

Trina Solar TSM-NEG21C.20-720W
TSM-NEG21C.20-720W
720 Wp 23.20 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Trina Solar TSM-NEG21C.20Q-740
TSM-NEG21C.20Q-740
740 Wp 23.80 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

20Q-740 leads on the differences that matter

The largest is module efficiency: 0.60 pp more efficient. 13 of 19 comparable parameters are identical.

See all 6 differences
How alike are they
13 of 19 comparable
parameters are identical
identical differs
01

What actually differs

6 of 19 parameters
Parameter 20-720W 20Q-740 Difference
Module efficiency 23.20 % 23.80 % 0.60 pp more efficient
Temperature coefficient -0.290 %/°C -0.260 %/°C 0.030 %/°C better in heat
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
Annual degradation 0.40 %/yr 0.35 %/yr 0.05 %/yr slower
Cell count 132 264 132 cells 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
20-720W
24,157 kWh
20Q-740
25,022 kWh
Lifetime gap
865 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 20-720W 20Q-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 711 W
Typical summer roof 55 °C 91.3% of rated power 657 W 682 W
Hot roof 70 °C 87.0% of rated power 626 W 653 W
03

Full specification

Parameter 20-720W 20Q-740 Difference
Power and efficiency
Rated power 720 Wp 740 Wp +20 W for 20Q-740
Module efficiency 23.20 % 23.80 % +0.60 pp for 20Q-740
Power density 231.8 Wp/m² 238.2 Wp/m² +6.4 Wp/m² for 20Q-740
Open-circuit voltage 49.40 V 50.10 V Effectively the same
Voltage at max power 41.30 V 42.10 V Effectively the same
Short-circuit current 18.49 A 18.69 A Effectively the same
Current at max power 17.44 A 17.58 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.260 %/°C +0.030 %/°C for 20Q-740
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 53.2 kg/kWp 51.8 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 0.35 %/yr -0.05 %/yr for 20Q-740
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 264 132 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#1,306 vs #433
20Q-740 leads by 873 places
Power density
#1,347 vs #431
20Q-740 leads by 916 places
Heat behaviour
#2,165 vs #511
20Q-740 leads by 1,654 places
Weight
#7,025 vs #5,125
20Q-740 leads by 1,900 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#516 vs #185
20Q-740 leads by 331 places
05

More useful comparisons

Open the full database
Same series, other bin
Trina Solar TSM-NEG21C.20-720W vs Trina Solar TSM-NEG21C.20Q-760
9 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20-720W vs Trina Solar TSM-NEG21C.20Q-755
9 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20-720W vs Trina Solar TSM-NEG21C.20Q-750
9 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20-720W vs Trina Solar TSM-NEG21C.20Q-745
7 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20-720W vs Trina Solar TSM-NEG21C.20-740
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20-720W vs Trina Solar TSM-NEG21C.20 740
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Trina Solar TSM-NEG21C.20-720W or Trina Solar TSM-NEG21C.20Q-740?
According to our database: Trina Solar TSM-NEG21C.20Q-740 has higher module efficiency (23.80% vs 23.20%); Trina Solar TSM-NEG21C.20Q-740 tolerates heat better (temp coeff -0.260%/°C vs -0.290%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Trina Solar TSM-NEG21C.20-720W and Trina Solar TSM-NEG21C.20Q-740?
Trina Solar TSM-NEG21C.20-720 W has a module efficiency of 23.20%, while Trina Solar TSM-NEG21C.20Q-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-NEG21C.20-720W use vs Trina Solar TSM-NEG21C.20Q-740?
Trina Solar TSM-NEG21C.20-720 W uses TOPCon cells; Trina Solar TSM-NEG21C.20Q-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-NEG21C.20-720W and Trina Solar TSM-NEG21C.20Q-740?
Trina Solar TSM-NEG21C.20-720 W has a 30 years power warranty; Trina Solar TSM-NEG21C.20Q-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-NEG21C.20-720W and Trina Solar TSM-NEG21C.20Q-740 bifacial panels?
Both Trina Solar TSM-NEG21C.20-720 W and Trina Solar TSM-NEG21C.20Q-740 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.