Trina Solar TSM-NEG18R.20-515 vs Trina Solar TSM-450 NEG9R.28
VS
The verdict
NEG18R.20-515 leads on the differences that matter
The largest is module efficiency: 0.70 pp more efficient. 6 of 19 comparable parameters are identical.
See all 13 differencesHow alike are they
6
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
13 of 19 parameters
What actually differs
Parameter
NEG18R.20-515
450 NEG9R.28
Difference
Module efficiency
23.20 %
22.50 %
0.70 pp more efficient
Rated power
515 Wp
450 Wp
65 W more power
Product warranty
15 yrs
25 yrs
10 yrs longer
Power density
231.6 Wp/m²
225.2 Wp/m²
6.4 Wp/m² higher
Open-circuit voltage
40.90 V
52.90 V
12.00 V apart
Short-circuit current
15.96 A
10.74 A
5.22 A apart
Module area
2.224 m²
1.998 m²
0.226 m² apart
Weight
23.5 kg
21.0 kg
2.5 kg lighter
Voltage at max power
33.90 V
44.60 V
10.70 V apart
Current at max power
15.20 A
10.09 A
5.11 A apart
Cell count
108
144
36 cells apart
Bifacial
No
Yes
No vs Yes
Dimensions
1961x1134x30 mm
1762x1134x30 mm
1961x1134x30 mm vs 1762x1134x30 mm
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.
NEG18R.20-515
17,279 kWh
450 NEG9R.28
15,098 kWh
Lifetime gap
2,181 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
NEG18R.20-515
450 NEG9R.28
Standard test conditions
25 °C
100.0% of rated power
515 W
450 W
Cool, bright day
40 °C
95.7% of rated power
493 W
430 W
Typical summer roof
55 °C
91.3% of rated power
470 W
411 W
Hot roof
70 °C
87.0% of rated power
448 W
391 W
03
Full specification
Parameter
NEG18R.20-515
450 NEG9R.28
Difference
Power and efficiency
Rated power
515 Wp
450 Wp
+65 W for NEG18R.20-515
Module efficiency
23.20 %
22.50 %
+0.70 pp for NEG18R.20-515
Power density
231.6 Wp/m²
225.2 Wp/m²
+6.4 Wp/m² for NEG18R.20-515
Open-circuit voltage
40.90 V
52.90 V
12.00 V apart
Voltage at max power
33.90 V
44.60 V
10.70 V apart
Short-circuit current
15.96 A
10.74 A
5.22 A apart
Current at max power
15.20 A
10.09 A
5.11 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
1961x1134x30 mm
1762x1134x30 mm
1961x1134x30 mm vs 1762x1134x30 mm
Module area
2.224 m²
1.998 m²
0.226 m² apart
Weight
23.5 kg
21.0 kg
-2.5 kg for 450 NEG9R.28
Weight per kWp
45.6 kg/kWp
46.7 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
15 yrs
25 yrs
+10 yrs for 450 NEG9R.28
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
108
144
36 cells apart
Bifacial
No
Yes
No vs Yes
04
14,005 panels
Against the whole database
Efficiency
#1,306
vs
#4,222
NEG18R.20-515 leads by 2,916 places
Power density
#1,473
vs
#4,225
NEG18R.20-515 leads by 2,752 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#789
vs
#1,258
NEG18R.20-515 leads by 469 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#5,086
vs
#6,031
NEG18R.20-515 leads by 945 places
05
Open the full database
More useful comparisons
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Trina Solar TSM-NEG18R.20-515 vs Trina Solar TSM-NEG18R.20-520
One difference: module efficiency
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Trina Solar TSM-450 NEG9R.28 vs Trina Solar TSM-NEG18R.28-520
13 differences, the largest is module efficiency
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Trina Solar TSM-450 NEG9R.28 vs Trina Solar TSM-NEG18RC.27-515
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Trina Solar TSM-450 NEG9R.28 vs Trina Solar TSM-NEG18R.28-515
13 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-450 NEG9R.28 vs Trina Solar TSM-NEG18R.25-515
13 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-450 NEG9R.28 vs Trina Solar TSM-NEG18RC.27-510
12 differences, the largest is rated power
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: Trina Solar TSM-NEG18R.20-515 or Trina Solar TSM-450 NEG9R.28?
According to our database: Trina Solar TSM-NEG18R.20-515 has higher module efficiency (23.20% vs 22.50%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Trina Solar TSM-NEG18R.20-515 and Trina Solar TSM-450 NEG9R.28?
Trina Solar TSM-NEG18R.20-515 has a module efficiency of 23.20%, while Trina Solar TSM-450 NEG9R.28 is 22.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Trina Solar TSM-NEG18R.20-515 use vs Trina Solar TSM-450 NEG9R.28?
Trina Solar TSM-NEG18R.20-515 uses TOPCon cells; Trina Solar TSM-450 NEG9R.28 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-NEG18R.20-515 and Trina Solar TSM-450 NEG9R.28?
Trina Solar TSM-NEG18R.20-515 has a 30 years power warranty; Trina Solar TSM-450 NEG9R.28 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-NEG18R.20-515 and Trina Solar TSM-450 NEG9R.28 bifacial panels?
Trina Solar TSM-450 NEG9R.28 is bifacial (captures light from both faces); Trina Solar TSM-NEG18R.20-515 is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Shop prices: See 248 Trina Solar offers
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.