Canadian Solar CS6L-455MS vs Canadian Solar CS7N-645MS
VS
The verdict
11 differences, and they point both ways
The largest is rated power: 190 W more power. 8 of 19 comparable parameters are identical.
See all 11 differencesHow alike are they
8
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
11 of 19 parameters
What actually differs
Parameter
CS6L-455MS
CS7N-645MS
Difference
Rated power
455 Wp
645 Wp
190 W more power
Weight
24.2 kg
33.9 kg
9.7 kg lighter
Short-circuit current
13.95 A
18.35 A
4.40 A apart
Module area
2.158 m²
3.106 m²
0.948 m² apart
Module efficiency
21.10 %
20.80 %
0.30 pp more efficient
Open-circuit voltage
41.20 V
44.80 V
3.60 V apart
Power density
210.8 Wp/m²
207.6 Wp/m²
3.2 Wp/m² higher
Current at max power
13.17 A
17.11 A
3.94 A apart
Cell count
120
132
12 cells apart
Voltage at max power
34.60 V
37.70 V
3.10 V apart
Dimensions
1903x1134x30 mm
2384x1303x35 mm
1903x1134x30 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.
CS6L-455MS
14,746 kWh
CS7N-645MS
20,904 kWh
Lifetime gap
6,158 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
CS6L-455MS
CS7N-645MS
Standard test conditions
25 °C
100.0% of rated power
455 W
645 W
Cool, bright day
40 °C
94.9% of rated power
432 W
612 W
Typical summer roof
55 °C
89.8% of rated power
409 W
579 W
Hot roof
70 °C
84.7% of rated power
385 W
546 W
03
Full specification
Parameter
CS6L-455MS
CS7N-645MS
Difference
Power and efficiency
Rated power
455 Wp
645 Wp
+190 W for CS7N-645MS
Module efficiency
21.10 %
20.80 %
+0.30 pp for CS6L-455MS
Power density
210.8 Wp/m²
207.6 Wp/m²
+3.2 Wp/m² for CS6L-455MS
Open-circuit voltage
41.20 V
44.80 V
3.60 V apart
Voltage at max power
34.60 V
37.70 V
3.10 V apart
Short-circuit current
13.95 A
18.35 A
4.40 A apart
Current at max power
13.17 A
17.11 A
3.94 A apart
Temperature
Temperature coefficient
-0.340 %/°C
-0.340 %/°C
Same
Mechanical
Dimensions
1903x1134x30 mm
2384x1303x35 mm
1903x1134x30 mm vs 2384x1303x35 mm
Module area
2.158 m²
3.106 m²
0.948 m² apart
Weight
24.2 kg
33.9 kg
-9.7 kg for CS6L-455MS
Weight per kWp
53.2 kg/kWp
52.6 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
14,005 panels
Against the whole database
Efficiency
#9,297
vs
#10,457
CS6L-455MS leads by 1,160 places
Power density
#9,534
vs
#10,562
CS6L-455MS leads by 1,028 places
Heat behaviour
#8,778
vs
#8,778
Tied - the same position in the database
Weight
#7,011
vs
#6,185
CS7N-645MS leads by 826 places
Warranty
#9,798
vs
#9,798
Tied - the same position in the database
Overall
#10,780
vs
#5,161
CS7N-645MS leads by 5,619 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: Canadian Solar CS6L-455MS or Canadian Solar CS7N-645MS?
According to our database: Canadian Solar CS6L-455MS has higher module efficiency (21.10% vs 20.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Canadian Solar CS6L-455MS and Canadian Solar CS7N-645MS?
Canadian Solar CS6L-455MS has a module efficiency of 21.10%, while Canadian Solar CS7N-645MS is 20.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Canadian Solar CS6L-455MS use vs Canadian Solar CS7N-645MS?
Canadian Solar CS6L-455MS uses PERC cells; Canadian Solar CS7N-645MS 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 CS6L-455MS and Canadian Solar CS7N-645MS?
Canadian Solar CS6L-455MS has a 25 years power warranty; Canadian Solar CS7N-645MS 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 40 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.