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635NEG19RC.20 vs NEG19RC.20-645 16 of 19 identical Swap Change panels

Trina Solar TSM-635NEG19RC.20 vs Trina Solar TSM-NEG19RC.20-645

Trina Solar TSM-635NEG19RC.20
TSM-635NEG19RC.20
635 Wp 23.50 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
TSM-NEG19RC.20-645
645 Wp 23.90 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

NEG19RC.20-645 leads on the differences that matter

The largest is module efficiency: 0.40 pp more efficient. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter 635NEG19RC.20 NEG19RC.20-645 Difference
Module efficiency 23.50 % 23.90 % 0.40 pp more efficient
Power density 235.1 Wp/m² 238.8 Wp/m² 3.7 Wp/m² higher
Rated power 635 Wp 645 Wp 10 W more power
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.
635NEG19RC.20
21,306 kWh
NEG19RC.20-645
21,641 kWh
Lifetime gap
335 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 635NEG19RC.20 NEG19RC.20-645
Standard test conditions 25 °C 100.0% of rated power 635 W 645 W
Cool, bright day 40 °C 95.7% of rated power 607 W 617 W
Typical summer roof 55 °C 91.3% of rated power 580 W 589 W
Hot roof 70 °C 87.0% of rated power 552 W 561 W
03

Full specification

Parameter 635NEG19RC.20 NEG19RC.20-645 Difference
Power and efficiency
Rated power 635 Wp 645 Wp +10 W for NEG19RC.20-645
Module efficiency 23.50 % 23.90 % +0.40 pp for NEG19RC.20-645
Power density 235.1 Wp/m² 238.8 Wp/m² +3.7 Wp/m² for NEG19RC.20-645
Open-circuit voltage 49.10 V 49.52 V Effectively the same
Voltage at max power 40.84 V 41.22 V Effectively the same
Short-circuit current 16.44 A 16.55 A Effectively the same
Current at max power 15.55 A 15.65 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2382x1134x30 mm 2382x1134x30 mm Same
Module area 2.701 m² 2.701 m² Same
Weight 33.0 kg 33.0 kg Same
Weight per kWp 52.0 kg/kWp 51.2 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#716 vs #351
NEG19RC.20-645 leads by 365 places
Power density
#741 vs #356
NEG19RC.20-645 leads by 385 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#5,408 vs #4,522
NEG19RC.20-645 leads by 886 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,750 vs #1,358
NEG19RC.20-645 leads by 392 places
05

More useful comparisons

Open the full database
Same series, other bin
Trina Solar TSM-635NEG19RC.20 vs Trina Solar TSM-NEG21C.20Q-760
13 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-635NEG19RC.20 vs Trina Solar TSM-NEG21C.20Q-755
13 differences, the largest is module efficiency
Same series, other bin
Trina Solar TSM-635NEG19RC.20 vs Trina Solar TSM-NEG21C.20Q-750
13 differences, the largest is rated power
Same series, other bin
Trina Solar TSM-635NEG19RC.20 vs Trina Solar TSM-NEG21C.20Q-745
13 differences, the largest is rated power
Same series, other bin
Trina Solar TSM-635NEG19RC.20 vs Trina Solar TSM-NEG21C.20-740
10 differences, the largest is rated power
Same series, other bin
Trina Solar TSM-635NEG19RC.20 vs Trina Solar TSM-NEG21C.20 740
10 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Trina Solar TSM-635NEG19RC.20 or Trina Solar TSM-NEG19RC.20-645?
According to our database: Trina Solar TSM-NEG19RC.20-645 has higher module efficiency (23.90% vs 23.50%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Trina Solar TSM-635NEG19RC.20 and Trina Solar TSM-NEG19RC.20-645?
Trina Solar TSM-635NEG19RC.20 has a module efficiency of 23.50%, while Trina Solar TSM-NEG19RC.20-645 is 23.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Trina Solar TSM-635NEG19RC.20 use vs Trina Solar TSM-NEG19RC.20-645?
Trina Solar TSM-635NEG19RC.20 uses TOPCon cells; Trina Solar TSM-NEG19RC.20-645 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-635NEG19RC.20 and Trina Solar TSM-NEG19RC.20-645?
Trina Solar TSM-635NEG19RC.20 has a 30 years power warranty; Trina Solar TSM-NEG19RC.20-645 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-635NEG19RC.20 and Trina Solar TSM-NEG19RC.20-645 bifacial panels?
Both Trina Solar TSM-635NEG19RC.20 and Trina Solar TSM-NEG19RC.20-645 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 249 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.