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48TD-455 vs 66TM-635 5 of 19 identical Swap Change panels

Canadian Solar CS6.2-48TD-455 vs Canadian Solar CS6.2-66TM-635

Canadian Solar CS6.2-48TD-455
CS6.2-48TD-455
455 Wp 22.80 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Canadian Solar CS6.2-66TM-635
CS6.2-66TM-635
635 Wp 23.50 % TOPCon
Open panel page Datasheet PDF
The verdict

66TM-635 leads on the differences that matter

The largest is module efficiency: 0.70 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 48TD-455 66TM-635 Difference
Module efficiency 22.80 % 23.50 % 0.70 pp more efficient
Rated power 455 Wp 635 Wp 180 W more power
Weight per kWp 54.1 kg/kWp 44.3 kg/kWp 9.8 kg/kWp lighter
Product warranty 25 yrs 12 yrs 13 yrs longer
Weight 24.6 kg 28.1 kg 3.5 kg lighter
Power density 227.7 Wp/m² 235.1 Wp/m² 7.4 Wp/m² higher
Short-circuit current 10.75 A 16.22 A 5.47 A apart
Module area 1.998 m² 2.701 m² 0.703 m² apart
Open-circuit voltage 53.10 V 49.40 V 3.70 V apart
Current at max power 10.12 A 15.18 A 5.06 A apart
Cell count 144 132 12 cells apart
Voltage at max power 45.00 V 41.90 V 3.10 V apart
Bifacial Yes No Yes vs No
Dimensions 1762x1134x30 mm 2382x1134x30 mm 1762x1134x30 mm vs 2382x1134x30 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.
48TD-455
15,266 kWh
66TM-635
21,306 kWh
Lifetime gap
6,040 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 48TD-455 66TM-635
Standard test conditions 25 °C 100.0% of rated power 455 W 635 W
Cool, bright day 40 °C 95.7% of rated power 435 W 607 W
Typical summer roof 55 °C 91.3% of rated power 415 W 580 W
Hot roof 70 °C 87.0% of rated power 396 W 552 W
03

Full specification

Parameter 48TD-455 66TM-635 Difference
Power and efficiency
Rated power 455 Wp 635 Wp +180 W for 66TM-635
Module efficiency 22.80 % 23.50 % +0.70 pp for 66TM-635
Power density 227.7 Wp/m² 235.1 Wp/m² +7.4 Wp/m² for 66TM-635
Open-circuit voltage 53.10 V 49.40 V 3.70 V apart
Voltage at max power 45.00 V 41.90 V 3.10 V apart
Short-circuit current 10.75 A 16.22 A 5.47 A apart
Current at max power 10.12 A 15.18 A 5.06 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 1762x1134x30 mm 2382x1134x30 mm 1762x1134x30 mm vs 2382x1134x30 mm
Module area 1.998 m² 2.701 m² 0.703 m² apart
Weight 24.6 kg 28.1 kg -3.5 kg for 48TD-455
Weight per kWp 54.1 kg/kWp 44.3 kg/kWp -9.8 kg/kWp for 66TM-635
Warranty and degradation
Product warranty 25 yrs 12 yrs +13 yrs for 48TD-455
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 No Yes vs No
04

Against the whole database

14,005 panels
Efficiency
#2,714 vs #716
66TM-635 leads by 1,998 places
Power density
#2,888 vs #741
66TM-635 leads by 2,147 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#8,287 vs #408
66TM-635 leads by 7,879 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#5,669 vs #1,683
66TM-635 leads by 3,986 places
05

More useful comparisons

Open the full database
Same series, other bin
Canadian Solar CS6.2-48TD-455 vs Canadian Solar CS6.2-66TM-630
14 differences, the largest is rated power
Same series, other bin
Canadian Solar CS6.2-48TD-455 vs Canadian Solar CS6.2-66TM-625
14 differences, the largest is rated power
Same series, other bin
Canadian Solar CS6.2-48TD-455 vs Canadian Solar CS6.2-66TM-620
13 differences, the largest is rated power
Same series, other bin
Canadian Solar CS6.2-48TD-455 vs Canadian Solar CS6.2-66TM-615
12 differences, the largest is rated power
Same series, other bin
Canadian Solar CS6.2-48TD-455 vs Canadian Solar CS6.2-66TM-610
13 differences, the largest is rated power
Same series, other bin
Canadian Solar CS6.2-48TD-455 vs Canadian Solar CS6W-600T
12 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Canadian Solar CS6.2-48TD-455 or Canadian Solar CS6.2-66TM-635?
According to our database: Canadian Solar CS6.2-66TM-635 has higher module efficiency (23.50% vs 22.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Canadian Solar CS6.2-48TD-455 and Canadian Solar CS6.2-66TM-635?
Canadian Solar CS6.2-48TD-455 has a module efficiency of 22.80%, while Canadian Solar CS6.2-66TM-635 is 23.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Canadian Solar CS6.2-48TD-455 use vs Canadian Solar CS6.2-66TM-635?
Canadian Solar CS6.2-48TD-455 uses TOPCon cells; Canadian Solar CS6.2-66TM-635 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 Canadian Solar CS6.2-48TD-455 and Canadian Solar CS6.2-66TM-635?
Canadian Solar CS6.2-48TD-455 has a 30 years power warranty; Canadian Solar CS6.2-66TM-635 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 Canadian Solar CS6.2-48TD-455 and Canadian Solar CS6.2-66TM-635 bifacial panels?
Canadian Solar CS6.2-48TD-455 is bifacial (captures light from both faces); Canadian Solar CS6.2-66TM-635 is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

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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.