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CS7N-660MS vs CS6L-455MS 10 of 19 identical Swap Change panels

Canadian Solar CS7N-660MS vs Canadian Solar CS6L-455MS

Canadian Solar CS7N-660MS
CS7N-660MS
660 Wp 21.20 % PERC
Open panel page Datasheet PDF
VS
Canadian Solar CS6L-455MS
CS6L-455MS
455 Wp 21.10 % PERC
Open panel page Datasheet PDF
The verdict

9 differences, and they point both ways

The largest is rated power: 205 W more power. 10 of 19 comparable parameters are identical.

See all 9 differences
How alike are they
10 of 19 comparable
parameters are identical
identical differs
01

What actually differs

9 of 19 parameters
Parameter CS7N-660MS CS6L-455MS Difference
Rated power 660 Wp 455 Wp 205 W more power
Weight 33.9 kg 24.2 kg 9.7 kg lighter
Open-circuit voltage 45.40 V 41.20 V 4.20 V apart
Short-circuit current 18.47 A 13.95 A 4.52 A apart
Module area 3.106 m² 2.158 m² 0.948 m² apart
Current at max power 17.24 A 13.17 A 4.07 A apart
Cell count 132 120 12 cells apart
Voltage at max power 38.30 V 34.60 V 3.70 V apart
Dimensions 2384x1303x35 mm 1903x1134x30 mm 2384x1303x35 mm vs 1903x1134x30 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 (-0.340 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
CS7N-660MS
21,390 kWh
CS6L-455MS
14,746 kWh
Lifetime gap
6,644 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario CS7N-660MS CS6L-455MS
Standard test conditions 25 °C 100.0% of rated power 660 W 455 W
Cool, bright day 40 °C 94.9% of rated power 626 W 432 W
Typical summer roof 55 °C 89.8% of rated power 593 W 409 W
Hot roof 70 °C 84.7% of rated power 559 W 385 W
03

Full specification

Parameter CS7N-660MS CS6L-455MS Difference
Power and efficiency
Rated power 660 Wp 455 Wp +205 W for CS7N-660MS
Module efficiency 21.20 % 21.10 % Effectively the same
Power density 212.5 Wp/m² 210.8 Wp/m² Effectively the same
Open-circuit voltage 45.40 V 41.20 V 4.20 V apart
Voltage at max power 38.30 V 34.60 V 3.70 V apart
Short-circuit current 18.47 A 13.95 A 4.52 A apart
Current at max power 17.24 A 13.17 A 4.07 A apart
Temperature
Temperature coefficient -0.340 %/°C -0.340 %/°C Same
Mechanical
Dimensions 2384x1303x35 mm 1903x1134x30 mm 2384x1303x35 mm vs 1903x1134x30 mm
Module area 3.106 m² 2.158 m² 0.948 m² apart
Weight 33.9 kg 24.2 kg -9.7 kg for CS6L-455MS
Weight per kWp 51.4 kg/kWp 53.2 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 25 yrs 25 yrs Same
Annual degradation 0.55 %/yr 0.55 %/yr Same
Technology
Cell technology PERC PERC Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 120 12 cells apart
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#9,076 vs #9,297
CS7N-660MS leads by 221 places
Power density
#8,959 vs #9,534
CS7N-660MS leads by 575 places
Heat behaviour
#8,778 vs #8,778
Tied - the same position in the database
Weight
#4,737 vs #7,011
CS7N-660MS leads by 2,274 places
Warranty
#9,798 vs #9,798
Tied - the same position in the database
Overall
#4,203 vs #10,780
CS7N-660MS leads by 6,577 places
05

More useful comparisons

Open the full database
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Canadian Solar CS7N-660MS vs Canadian Solar CS7N-670MS
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Canadian Solar CS7N-660MS vs Canadian Solar CS7N-665MS
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Canadian Solar CS7N-660MS vs Canadian Solar CS7N-655MS
The same specification on paper
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Canadian Solar CS7N-660MS vs Canadian Solar CS7N-650MS
3 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS7N-660MS vs Canadian Solar CS7N-645MS
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Canadian Solar CS7N-660MS or Canadian Solar CS6L-455MS?
According to our database: Canadian Solar CS7N-660MS has higher module efficiency (21.20% vs 21.10%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Canadian Solar CS7N-660MS and Canadian Solar CS6L-455MS?
Canadian Solar CS7N-660MS has a module efficiency of 21.20%, while Canadian Solar CS6L-455MS is 21.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Canadian Solar CS7N-660MS use vs Canadian Solar CS6L-455MS?
Canadian Solar CS7N-660MS uses PERC cells; Canadian Solar CS6L-455MS uses PERC. 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 CS7N-660MS and Canadian Solar CS6L-455MS?
Canadian Solar CS7N-660MS has a 25 years power warranty; Canadian Solar CS6L-455MS has a 25 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.

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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.