Skip to main content
NEG9RC.27-435 vs NEG21C.20Q-755 5 of 19 identical Swap Change panels

Trina Solar TSM-NEG9RC.27-435 vs Trina Solar TSM-NEG21C.20Q-755

Trina Solar TSM-NEG9RC.27-435
TSM-NEG9RC.27-435
435 Wp 21.80 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Trina Solar TSM-NEG21C.20Q-755
TSM-NEG21C.20Q-755
755 Wp 24.30 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

NEG21C.20Q-755 leads on the differences that matter

The largest is module efficiency: 2.50 pp more efficient. 5 of 19 comparable parameters are identical.

See all 14 differences
How alike are they
5 of 19 comparable
parameters are identical
identical differs
01

What actually differs

14 of 19 parameters
Parameter NEG9RC.27-435 NEG21C.20Q-755 Difference
Module efficiency 21.80 % 24.30 % 2.50 pp more efficient
Rated power 435 Wp 755 Wp 320 W more power
Power density 217.7 Wp/m² 243.1 Wp/m² 25.3 Wp/m² higher
Temperature coefficient -0.290 %/°C -0.260 %/°C 0.030 %/°C better in heat
Weight 21.0 kg 38.3 kg 17.3 kg lighter
Product warranty 15 yrs 12 yrs 3 yrs longer
Short-circuit current 10.64 A 18.81 A 8.17 A apart
Module area 1.998 m² 3.106 m² 1.108 m² apart
Annual degradation 0.40 %/yr 0.35 %/yr 0.05 %/yr slower
Current at max power 9.99 A 17.69 A 7.70 A apart
Cell count 144 264 120 cells apart
Weight per kWp 48.3 kg/kWp 50.7 kg/kWp 2.5 kg/kWp lighter
Open-circuit voltage 51.80 V 50.70 V 1.10 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
NEG9RC.27-435
14,595 kWh
NEG21C.20Q-755
25,529 kWh
Lifetime gap
10,934 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario NEG9RC.27-435 NEG21C.20Q-755
Standard test conditions 25 °C 100.0% of rated power 435 W 755 W
Cool, bright day 40 °C 95.7% of rated power 416 W 726 W
Typical summer roof 55 °C 91.3% of rated power 397 W 696 W
Hot roof 70 °C 87.0% of rated power 378 W 667 W
03

Full specification

Parameter NEG9RC.27-435 NEG21C.20Q-755 Difference
Power and efficiency
Rated power 435 Wp 755 Wp +320 W for NEG21C.20Q-755
Module efficiency 21.80 % 24.30 % +2.50 pp for NEG21C.20Q-755
Power density 217.7 Wp/m² 243.1 Wp/m² +25.3 Wp/m² for NEG21C.20Q-755
Open-circuit voltage 51.80 V 50.70 V 1.10 V apart
Voltage at max power 43.60 V 42.70 V Effectively the same
Short-circuit current 10.64 A 18.81 A 8.17 A apart
Current at max power 9.99 A 17.69 A 7.70 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.260 %/°C +0.030 %/°C for NEG21C.20Q-755
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 NEG9RC.27-435
Weight per kWp 48.3 kg/kWp 50.7 kg/kWp -2.5 kg/kWp for NEG9RC.27-435
Warranty and degradation
Product warranty 15 yrs 12 yrs +3 yrs for NEG9RC.27-435
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.35 %/yr -0.05 %/yr for NEG21C.20Q-755
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 144 264 120 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#7,022 vs #131
NEG21C.20Q-755 leads by 6,891 places
Power density
#7,066 vs #136
NEG21C.20Q-755 leads by 6,930 places
Heat behaviour
#2,165 vs #511
NEG21C.20Q-755 leads by 1,654 places
Weight
#2,138 vs #4,131
NEG9RC.27-435 leads by 1,993 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#9,574 vs #91
NEG21C.20Q-755 leads by 9,483 places
05

More useful comparisons

Open the full database
Same series, other bin
Trina Solar TSM-NEG9RC.27-435 vs Trina Solar TSM-NEG9RC.27-450
5 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG9RC.27-435 vs Trina Solar TSM-NEG9RC.27-445
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG9RC.27-435 vs Trina Solar TSM-NEG9RC.27-440
One difference: module efficiency
Same series, other bin
Trina Solar TSM-NEG9RC.27-435 vs Trina Solar TSM-NEG9RC.27-430
One difference: module efficiency
Same series, other bin
Trina Solar TSM-NEG9RC.27-435 vs Trina Solar TSM-NEG9RC.27-425
3 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-NEG21C.20Q-755 vs Trina Solar TSM-NEG21C.20Q-760
One difference: module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Trina Solar TSM-NEG9RC.27-435 or Trina Solar TSM-NEG21C.20Q-755?
According to our database: Trina Solar TSM-NEG21C.20Q-755 has higher module efficiency (24.30% vs 21.80%); Trina Solar TSM-NEG21C.20Q-755 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-NEG9RC.27-435 and Trina Solar TSM-NEG21C.20Q-755?
Trina Solar TSM-NEG9RC.27-435 has a module efficiency of 21.80%, while Trina Solar TSM-NEG21C.20Q-755 is 24.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Trina Solar TSM-NEG9RC.27-435 use vs Trina Solar TSM-NEG21C.20Q-755?
Trina Solar TSM-NEG9RC.27-435 uses TOPCon cells; Trina Solar TSM-NEG21C.20Q-755 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-NEG9RC.27-435 and Trina Solar TSM-NEG21C.20Q-755?
Trina Solar TSM-NEG9RC.27-435 has a 30 years power warranty; Trina Solar TSM-NEG21C.20Q-755 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-NEG9RC.27-435 and Trina Solar TSM-NEG21C.20Q-755 bifacial panels?
Both Trina Solar TSM-NEG9RC.27-435 and Trina Solar TSM-NEG21C.20Q-755 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 252 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.