Trina Solar TSM-450 NEG9R.28 vs Trina Solar TSM-NEG18R.20-520
VS
The verdict
NEG18R.20-520 leads on the differences that matter
The largest is module efficiency: 0.90 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
450 NEG9R.28
NEG18R.20-520
Difference
Module efficiency
22.50 %
23.40 %
0.90 pp more efficient
Rated power
450 Wp
520 Wp
70 W more power
Product warranty
25 yrs
15 yrs
10 yrs longer
Power density
225.2 Wp/m²
233.8 Wp/m²
8.6 Wp/m² higher
Open-circuit voltage
52.90 V
41.20 V
11.70 V apart
Short-circuit current
10.74 A
15.99 A
5.25 A apart
Module area
1.998 m²
2.224 m²
0.226 m² apart
Weight
21.0 kg
23.5 kg
2.5 kg lighter
Voltage at max power
44.60 V
34.10 V
10.50 V apart
Current at max power
10.09 A
15.25 A
5.16 A apart
Cell count
144
108
36 cells apart
Bifacial
Yes
No
Yes vs No
Dimensions
1762x1134x30 mm
1961x1134x30 mm
1762x1134x30 mm vs 1961x1134x30 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.
450 NEG9R.28
15,098 kWh
NEG18R.20-520
17,447 kWh
Lifetime gap
2,349 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
450 NEG9R.28
NEG18R.20-520
Standard test conditions
25 °C
100.0% of rated power
450 W
520 W
Cool, bright day
40 °C
95.7% of rated power
430 W
497 W
Typical summer roof
55 °C
91.3% of rated power
411 W
475 W
Hot roof
70 °C
87.0% of rated power
391 W
452 W
03
Full specification
Parameter
450 NEG9R.28
NEG18R.20-520
Difference
Power and efficiency
Rated power
450 Wp
520 Wp
+70 W for NEG18R.20-520
Module efficiency
22.50 %
23.40 %
+0.90 pp for NEG18R.20-520
Power density
225.2 Wp/m²
233.8 Wp/m²
+8.6 Wp/m² for NEG18R.20-520
Open-circuit voltage
52.90 V
41.20 V
11.70 V apart
Voltage at max power
44.60 V
34.10 V
10.50 V apart
Short-circuit current
10.74 A
15.99 A
5.25 A apart
Current at max power
10.09 A
15.25 A
5.16 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
1762x1134x30 mm
1961x1134x30 mm
1762x1134x30 mm vs 1961x1134x30 mm
Module area
1.998 m²
2.224 m²
0.226 m² apart
Weight
21.0 kg
23.5 kg
-2.5 kg for 450 NEG9R.28
Weight per kWp
46.7 kg/kWp
45.2 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
25 yrs
15 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
144
108
36 cells apart
Bifacial
Yes
No
Yes vs No
04
14,005 panels
Against the whole database
Efficiency
#4,222
vs
#882
NEG18R.20-520 leads by 3,340 places
Power density
#4,225
vs
#909
NEG18R.20-520 leads by 3,316 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#1,258
vs
#635
NEG18R.20-520 leads by 623 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#6,031
vs
#4,727
NEG18R.20-520 leads by 1,304 places
05
Open the full database
More useful comparisons
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Trina Solar TSM-450 NEG9R.28 vs Trina Solar TSM-NEG18R.20-515
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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
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07
Questions about this pairing
Which panel is better: Trina Solar TSM-450 NEG9R.28 or Trina Solar TSM-NEG18R.20-520?
According to our database: Trina Solar TSM-NEG18R.20-520 has higher module efficiency (23.40% 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-450 NEG9R.28 and Trina Solar TSM-NEG18R.20-520?
Trina Solar TSM-450 NEG9R.28 has a module efficiency of 22.50%, while Trina Solar TSM-NEG18R.20-520 is 23.40%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Trina Solar TSM-450 NEG9R.28 use vs Trina Solar TSM-NEG18R.20-520?
Trina Solar TSM-450 NEG9R.28 uses TOPCon cells; Trina Solar TSM-NEG18R.20-520 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-450 NEG9R.28 and Trina Solar TSM-NEG18R.20-520?
Trina Solar TSM-450 NEG9R.28 has a 30 years power warranty; Trina Solar TSM-NEG18R.20-520 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-450 NEG9R.28 and Trina Solar TSM-NEG18R.20-520 bifacial panels?
Trina Solar TSM-450 NEG9R.28 is bifacial (captures light from both faces); Trina Solar TSM-NEG18R.20-520 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.