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CS6W-540MS vs CS7N-660MS 8 of 19 identical Swap Change panels

Canadian Solar CS6W-540MS vs Canadian Solar CS7N-660MS

Canadian Solar CS6W-540MS
CS6W-540MS
540 Wp 20.90 % PERC
Open panel page Datasheet PDF
VS
Canadian Solar CS7N-660MS
CS7N-660MS
660 Wp 21.20 % PERC
Open panel page Datasheet PDF
The verdict

CS7N-660MS leads on the differences that matter

The largest is rated power: 120 W more power. 8 of 19 comparable parameters are identical.

See all 11 differences
How alike are they
8 of 19 comparable
parameters are identical
identical differs
01

What actually differs

11 of 19 parameters
Parameter CS6W-540MS CS7N-660MS Difference
Rated power 540 Wp 660 Wp 120 W more power
Weight 27.6 kg 33.9 kg 6.3 kg lighter
Short-circuit current 13.90 A 18.47 A 4.57 A apart
Module area 2.583 m² 3.106 m² 0.523 m² apart
Open-circuit voltage 49.20 V 45.40 V 3.80 V apart
Module efficiency 20.90 % 21.20 % 0.30 pp more efficient
Power density 209.0 Wp/m² 212.5 Wp/m² 3.4 Wp/m² higher
Current at max power 13.08 A 17.24 A 4.16 A apart
Cell count 144 132 12 cells apart
Voltage at max power 41.30 V 38.30 V 3.00 V apart
Dimensions 2278x1134x30 mm 2384x1303x35 mm 2278x1134x30 mm vs 2384x1303x35 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.
CS6W-540MS
17,501 kWh
CS7N-660MS
21,390 kWh
Lifetime gap
3,889 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario CS6W-540MS CS7N-660MS
Standard test conditions 25 °C 100.0% of rated power 540 W 660 W
Cool, bright day 40 °C 94.9% of rated power 512 W 626 W
Typical summer roof 55 °C 89.8% of rated power 485 W 593 W
Hot roof 70 °C 84.7% of rated power 457 W 559 W
03

Full specification

Parameter CS6W-540MS CS7N-660MS Difference
Power and efficiency
Rated power 540 Wp 660 Wp +120 W for CS7N-660MS
Module efficiency 20.90 % 21.20 % +0.30 pp for CS7N-660MS
Power density 209.0 Wp/m² 212.5 Wp/m² +3.4 Wp/m² for CS7N-660MS
Open-circuit voltage 49.20 V 45.40 V 3.80 V apart
Voltage at max power 41.30 V 38.30 V 3.00 V apart
Short-circuit current 13.90 A 18.47 A 4.57 A apart
Current at max power 13.08 A 17.24 A 4.16 A apart
Temperature
Temperature coefficient -0.340 %/°C -0.340 %/°C Same
Mechanical
Dimensions 2278x1134x30 mm 2384x1303x35 mm 2278x1134x30 mm vs 2384x1303x35 mm
Module area 2.583 m² 3.106 m² 0.523 m² apart
Weight 27.6 kg 33.9 kg -6.3 kg for CS6W-540MS
Weight per kWp 51.1 kg/kWp 51.4 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 144 132 12 cells apart
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#10,072 vs #9,076
CS7N-660MS leads by 996 places
Power density
#10,100 vs #8,959
CS7N-660MS leads by 1,141 places
Heat behaviour
#8,778 vs #8,778
Tied - the same position in the database
Weight
#4,436 vs #4,737
CS6W-540MS leads by 301 places
Warranty
#9,798 vs #9,798
Tied - the same position in the database
Overall
#8,908 vs #4,203
CS7N-660MS leads by 4,705 places
05

More useful comparisons

Open the full database
Same series, other bin
Canadian Solar CS6W-540MS vs Canadian Solar CS7N-675MS
11 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS6W-540MS vs Canadian Solar CS7N-670MS
11 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS6W-540MS vs Canadian Solar CS7N-665MS
11 differences, the largest is rated power
Same series, other bin
Canadian Solar CS6W-540MS vs Canadian Solar CS7N-655MS
10 differences, the largest is rated power
Same series, other bin
Canadian Solar CS6W-540MS vs Canadian Solar CS7N-650MS
9 differences, the largest is rated power
Same series, other bin
Canadian Solar CS6W-540MS vs Canadian Solar CS7N-645MS
9 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Canadian Solar CS6W-540MS or Canadian Solar CS7N-660MS?
According to our database: Canadian Solar CS7N-660MS has higher module efficiency (21.20% vs 20.90%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Canadian Solar CS6W-540MS and Canadian Solar CS7N-660MS?
Canadian Solar CS6W-540MS has a module efficiency of 20.90%, while Canadian Solar CS7N-660MS is 21.20%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Canadian Solar CS6W-540MS use vs Canadian Solar CS7N-660MS?
Canadian Solar CS6W-540MS uses PERC cells; Canadian Solar CS7N-660MS 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 CS6W-540MS and Canadian Solar CS7N-660MS?
Canadian Solar CS6W-540MS has a 25 years power warranty; Canadian Solar CS7N-660MS 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.