Trina Solar TSM-435NEG9R.28 vs Trina Solar TSM-NEG21C.20 725W
VS
The verdict
NEG21C.20 725W leads on the differences that matter
The largest is module efficiency: 1.50 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
435NEG9R.28
NEG21C.20 725W
Difference
Module efficiency
21.80 %
23.30 %
1.50 pp more efficient
Rated power
435 Wp
725 Wp
290 W more power
Power density
217.7 Wp/m²
233.4 Wp/m²
15.7 Wp/m² higher
Weight
21.0 kg
38.3 kg
17.3 kg lighter
Product warranty
25 yrs
12 yrs
13 yrs longer
Short-circuit current
10.64 A
18.54 A
7.90 A apart
Module area
1.998 m²
3.106 m²
1.108 m² apart
Weight per kWp
48.3 kg/kWp
52.8 kg/kWp
4.6 kg/kWp lighter
Open-circuit voltage
51.80 V
49.60 V
2.20 V apart
Current at max power
9.99 A
17.47 A
7.48 A apart
Cell count
144
132
12 cells apart
Voltage at max power
43.60 V
41.50 V
2.10 V apart
Dimensions
1762x1134x30 mm
2384x1303x33 mm
1762x1134x30 mm vs 2384x1303x33 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.
435NEG9R.28
14,595 kWh
NEG21C.20 725W
24,325 kWh
Lifetime gap
9,730 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
435NEG9R.28
NEG21C.20 725W
Standard test conditions
25 °C
100.0% of rated power
435 W
725 W
Cool, bright day
40 °C
95.7% of rated power
416 W
693 W
Typical summer roof
55 °C
91.3% of rated power
397 W
662 W
Hot roof
70 °C
87.0% of rated power
378 W
630 W
03
Full specification
Parameter
435NEG9R.28
NEG21C.20 725W
Difference
Power and efficiency
Rated power
435 Wp
725 Wp
+290 W for NEG21C.20 725W
Module efficiency
21.80 %
23.30 %
+1.50 pp for NEG21C.20 725W
Power density
217.7 Wp/m²
233.4 Wp/m²
+15.7 Wp/m² for NEG21C.20 725W
Open-circuit voltage
51.80 V
49.60 V
2.20 V apart
Voltage at max power
43.60 V
41.50 V
2.10 V apart
Short-circuit current
10.64 A
18.54 A
7.90 A apart
Current at max power
9.99 A
17.47 A
7.48 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
1762x1134x30 mm
2384x1303x33 mm
1762x1134x30 mm vs 2384x1303x33 mm
Module area
1.998 m²
3.106 m²
1.108 m² apart
Weight
21.0 kg
38.3 kg
-17.3 kg for 435NEG9R.28
Weight per kWp
48.3 kg/kWp
52.8 kg/kWp
-4.6 kg/kWp for 435NEG9R.28
Warranty and degradation
Product warranty
25 yrs
12 yrs
+13 yrs for 435NEG9R.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
132
12 cells apart
Bifacial
Yes
Yes
Same
04
14,129 panels
Against the whole database
Efficiency
#7,085
vs
#1,057
NEG21C.20 725W leads by 6,028 places
Power density
#7,129
vs
#974
NEG21C.20 725W leads by 6,155 places
Heat behaviour
#2,220
vs
#2,220
Tied - the same position in the database
Weight
#2,142
vs
#6,570
435NEG9R.28 leads by 4,428 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#7,586
vs
#431
NEG21C.20 725W leads by 7,155 places
05
Open the full database
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06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: Trina Solar TSM-435NEG9R.28 or Trina Solar TSM-NEG21C.20 725W?
According to our database: Trina Solar TSM-NEG21C.20 725 W has higher module efficiency (23.30% vs 21.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Trina Solar TSM-435NEG9R.28 and Trina Solar TSM-NEG21C.20 725W?
Trina Solar TSM-435NEG9R.28 has a module efficiency of 21.80%, while Trina Solar TSM-NEG21C.20 725 W is 23.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Trina Solar TSM-435NEG9R.28 use vs Trina Solar TSM-NEG21C.20 725W?
Trina Solar TSM-435NEG9R.28 uses TOPCon cells; Trina Solar TSM-NEG21C.20 725 W 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-435NEG9R.28 and Trina Solar TSM-NEG21C.20 725W?
Trina Solar TSM-435NEG9R.28 has a 30 years power warranty; Trina Solar TSM-NEG21C.20 725 W 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-435NEG9R.28 and Trina Solar TSM-NEG21C.20 725W bifacial panels?
Both Trina Solar TSM-435NEG9R.28 and Trina Solar TSM-NEG21C.20 725 W 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.
Shop prices: See 189 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.