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20Q-745 vs 20 730 13 of 19 identical Swap Change panels

Trina Solar TSM-NEG21C.20Q-745 vs Trina Solar TSM-NEG21C.20 730

TSM-NEG21C.20Q-745
745 Wp 24.00 % TOPCon Bifacial
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VS
TSM-NEG21C.20 730
730 Wp 23.50 % TOPCon Bifacial
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The verdict

20Q-745 leads on the differences that matter

The largest is temperature coefficient: 0.030 %/°C better in heat. 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 20Q-745 20 730 Difference
Temperature coefficient -0.260 %/°C -0.290 %/°C 0.030 %/°C better in heat
Module efficiency 24.00 % 23.50 % 0.50 pp more efficient
Power density 239.8 Wp/m² 235.0 Wp/m² 4.8 Wp/m² higher
Rated power 745 Wp 730 Wp 15 W more power
Annual degradation 0.35 %/yr 0.40 %/yr 0.05 %/yr slower
Cell count 264 132 132 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
20Q-745
25,191 kWh
20 730
24,493 kWh
Lifetime gap
698 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 20Q-745 20 730
Standard test conditions 25 °C 100.0% of rated power 745 W 730 W
Cool, bright day 40 °C 95.7% of rated power 716 W 698 W
Typical summer roof 55 °C 91.3% of rated power 687 W 666 W
Hot roof 70 °C 87.0% of rated power 658 W 635 W
03

Full specification

Parameter 20Q-745 20 730 Difference
Power and efficiency
Rated power 745 Wp 730 Wp +15 W for 20Q-745
Module efficiency 24.00 % 23.50 % +0.50 pp for 20Q-745
Power density 239.8 Wp/m² 235.0 Wp/m² +4.8 Wp/m² for 20Q-745
Open-circuit voltage 50.30 V 49.90 V Effectively the same
Voltage at max power 42.30 V 41.70 V Effectively the same
Short-circuit current 18.73 A 18.58 A Effectively the same
Current at max power 17.62 A 17.51 A Effectively the same
Temperature
Temperature coefficient -0.260 %/°C -0.290 %/°C +0.030 %/°C for 20Q-745
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 51.4 kg/kWp 52.5 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.35 %/yr 0.40 %/yr -0.05 %/yr for 20Q-745
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 264 132 132 cells apart
Bifacial Yes Yes Same
04

Against the whole database

13,953 panels
Efficiency
#301 vs #708
20Q-745 leads by 407 places
Power density
#335 vs #790
20Q-745 leads by 455 places
Heat behaviour
#511 vs #2,146
20Q-745 leads by 1,635 places
Weight
#4,778 vs #5,958
20Q-745 leads by 1,180 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#144 vs #303
20Q-745 leads by 159 places
05

More useful comparisons

Open the full database
Same series, other bin
Trina Solar TSM-NEG21C.20Q-745 vs Trina Solar TSM-NEG21C.20Q-760
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20Q-745 vs Trina Solar TSM-NEG21C.20Q-755
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20Q-745 vs Trina Solar TSM-NEG21C.20Q-750
The same specification on paper
Same series, other bin
Trina Solar TSM-NEG21C.20Q-745 vs Trina Solar TSM-NEG21C.20Q-740
One difference: module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20Q-745 vs Trina Solar TSM-NEG21C.20Q-735
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20Q-745 vs Trina Solar TSM-NEG19RC.20Q
9 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Trina Solar TSM-NEG21C.20Q-745 or Trina Solar TSM-NEG21C.20 730?
According to our database: Trina Solar TSM-NEG21C.20Q-745 has higher module efficiency (24.00% vs 23.50%); Trina Solar TSM-NEG21C.20Q-745 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.20Q-745 and Trina Solar TSM-NEG21C.20 730?
Trina Solar TSM-NEG21C.20Q-745 has a module efficiency of 24.00%, while Trina Solar TSM-NEG21C.20 730 is 23.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Trina Solar TSM-NEG21C.20Q-745 use vs Trina Solar TSM-NEG21C.20 730?
Trina Solar TSM-NEG21C.20Q-745 uses TOPCon cells; Trina Solar TSM-NEG21C.20 730 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.20Q-745 and Trina Solar TSM-NEG21C.20 730?
Trina Solar TSM-NEG21C.20Q-745 has a 30 years power warranty; Trina Solar TSM-NEG21C.20 730 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.20Q-745 and Trina Solar TSM-NEG21C.20 730 bifacial panels?
Both Trina Solar TSM-NEG21C.20Q-745 and Trina Solar TSM-NEG21C.20 730 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.