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CS7L-615MS vs CS7N-665MS 10 of 19 identical Swap Change panels

Canadian Solar CS7L-615MS vs Canadian Solar CS7N-665MS

Canadian Solar CS7L-615MS
CS7L-615MS
615 Wp 21.70 % PERC
Open panel page Datasheet PDF
VS
Canadian Solar CS7N-665MS
CS7N-665MS
665 Wp 21.40 % PERC
Open panel page Datasheet PDF
The verdict

9 differences, and they point both ways

The largest is rated power: 50 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 CS7L-615MS CS7N-665MS Difference
Rated power 615 Wp 665 Wp 50 W more power
Weight 30.9 kg 33.9 kg 3.0 kg lighter
Module area 2.830 m² 3.106 m² 0.276 m² apart
Module efficiency 21.70 % 21.40 % 0.30 pp more efficient
Open-circuit voltage 41.90 V 45.60 V 3.70 V apart
Power density 217.3 Wp/m² 214.1 Wp/m² 3.2 Wp/m² higher
Cell count 120 132 12 cells apart
Voltage at max power 35.40 V 38.50 V 3.10 V apart
Dimensions 2172x1303x35 mm 2384x1303x35 mm 2172x1303x35 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.
CS7L-615MS
19,932 kWh
CS7N-665MS
21,552 kWh
Lifetime gap
1,620 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario CS7L-615MS CS7N-665MS
Standard test conditions 25 °C 100.0% of rated power 615 W 665 W
Cool, bright day 40 °C 94.9% of rated power 584 W 631 W
Typical summer roof 55 °C 89.8% of rated power 552 W 597 W
Hot roof 70 °C 84.7% of rated power 521 W 563 W
03

Full specification

Parameter CS7L-615MS CS7N-665MS Difference
Power and efficiency
Rated power 615 Wp 665 Wp +50 W for CS7N-665MS
Module efficiency 21.70 % 21.40 % +0.30 pp for CS7L-615MS
Power density 217.3 Wp/m² 214.1 Wp/m² +3.2 Wp/m² for CS7L-615MS
Open-circuit voltage 41.90 V 45.60 V 3.70 V apart
Voltage at max power 35.40 V 38.50 V 3.10 V apart
Short-circuit current 18.62 A 18.51 A Effectively the same
Current at max power 17.38 A 17.28 A Effectively the same
Temperature
Temperature coefficient -0.340 %/°C -0.340 %/°C Same
Mechanical
Dimensions 2172x1303x35 mm 2384x1303x35 mm 2172x1303x35 mm vs 2384x1303x35 mm
Module area 2.830 m² 3.106 m² 0.276 m² apart
Weight 30.9 kg 33.9 kg -3.0 kg for CS7L-615MS
Weight per kWp 50.2 kg/kWp 51.0 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 120 132 12 cells apart
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#7,421 vs #8,323
CS7L-615MS leads by 902 places
Power density
#7,329 vs #8,250
CS7L-615MS leads by 921 places
Heat behaviour
#8,778 vs #8,778
Tied - the same position in the database
Weight
#3,688 vs #4,337
CS7L-615MS leads by 649 places
Warranty
#9,798 vs #9,798
Tied - the same position in the database
Overall
#5,126 vs #3,807
CS7N-665MS leads by 1,319 places
05

More useful comparisons

Open the full database
Same series, other bin
Canadian Solar CS7L-615MS vs Canadian Solar CS7N-675MS
7 differences, the largest is rated power
Same series, other bin
Canadian Solar CS7L-615MS vs Canadian Solar CS7N-670MS
7 differences, the largest is rated power
Same series, other bin
Canadian Solar CS7L-615MS vs Canadian Solar CS7N-660MS
9 differences, the largest is rated power
Same series, other bin
Canadian Solar CS7L-615MS vs Canadian Solar CS7N-655MS
9 differences, the largest is rated power
Same series, other bin
Canadian Solar CS7L-615MS vs Canadian Solar CS7N-650MS
9 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS7L-615MS vs Canadian Solar CS7N-645MS
10 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Canadian Solar CS7L-615MS or Canadian Solar CS7N-665MS?
According to our database: Canadian Solar CS7L-615MS has higher module efficiency (21.70% vs 21.40%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Canadian Solar CS7L-615MS and Canadian Solar CS7N-665MS?
Canadian Solar CS7L-615MS has a module efficiency of 21.70%, while Canadian Solar CS7N-665MS is 21.40%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Canadian Solar CS7L-615MS use vs Canadian Solar CS7N-665MS?
Canadian Solar CS7L-615MS uses PERC cells; Canadian Solar CS7N-665MS 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 CS7L-615MS and Canadian Solar CS7N-665MS?
Canadian Solar CS7L-615MS has a 25 years power warranty; Canadian Solar CS7N-665MS 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.

Shop prices: See 39 Canadian 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.