Skip to main content
CS7N-645MS vs CS6L-455MS 8 of 19 identical Swap Change panels

Canadian Solar CS7N-645MS vs Canadian Solar CS6L-455MS

Canadian Solar CS7N-645MS
CS7N-645MS
645 Wp 20.80 % 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

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

What actually differs

11 of 19 parameters
Parameter CS7N-645MS CS6L-455MS Difference
Rated power 645 Wp 455 Wp 190 W more power
Weight 33.9 kg 24.2 kg 9.7 kg lighter
Short-circuit current 18.35 A 13.95 A 4.40 A apart
Module area 3.106 m² 2.158 m² 0.948 m² apart
Module efficiency 20.80 % 21.10 % 0.30 pp more efficient
Open-circuit voltage 44.80 V 41.20 V 3.60 V apart
Power density 207.6 Wp/m² 210.8 Wp/m² 3.2 Wp/m² higher
Current at max power 17.11 A 13.17 A 3.94 A apart
Cell count 132 120 12 cells apart
Voltage at max power 37.70 V 34.60 V 3.10 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-645MS
20,904 kWh
CS6L-455MS
14,746 kWh
Lifetime gap
6,158 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario CS7N-645MS CS6L-455MS
Standard test conditions 25 °C 100.0% of rated power 645 W 455 W
Cool, bright day 40 °C 94.9% of rated power 612 W 432 W
Typical summer roof 55 °C 89.8% of rated power 579 W 409 W
Hot roof 70 °C 84.7% of rated power 546 W 385 W
03

Full specification

Parameter CS7N-645MS CS6L-455MS Difference
Power and efficiency
Rated power 645 Wp 455 Wp +190 W for CS7N-645MS
Module efficiency 20.80 % 21.10 % +0.30 pp for CS6L-455MS
Power density 207.6 Wp/m² 210.8 Wp/m² +3.2 Wp/m² for CS6L-455MS
Open-circuit voltage 44.80 V 41.20 V 3.60 V apart
Voltage at max power 37.70 V 34.60 V 3.10 V apart
Short-circuit current 18.35 A 13.95 A 4.40 A apart
Current at max power 17.11 A 13.17 A 3.94 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 52.6 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
#10,457 vs #9,297
CS6L-455MS leads by 1,160 places
Power density
#10,562 vs #9,534
CS6L-455MS leads by 1,028 places
Heat behaviour
#8,778 vs #8,778
Tied - the same position in the database
Weight
#6,185 vs #7,011
CS7N-645MS leads by 826 places
Warranty
#9,798 vs #9,798
Tied - the same position in the database
Overall
#5,161 vs #10,780
CS7N-645MS leads by 5,619 places
05

More useful comparisons

Open the full database
Same series, other bin
Canadian Solar CS7N-645MS vs Canadian Solar CS7N-675MS
6 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS7N-645MS vs Canadian Solar CS7N-670MS
5 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS7N-645MS vs Canadian Solar CS7N-665MS
3 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS7N-645MS vs Canadian Solar CS7N-660MS
3 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS7N-645MS vs Canadian Solar CS7N-655MS
3 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS7N-645MS vs Canadian Solar CS7N-650MS
The same specification on paper
06

Written summary

07

Questions about this pairing

Which panel is better: Canadian Solar CS7N-645MS or Canadian Solar CS6L-455MS?
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 CS7N-645MS and Canadian Solar CS6L-455MS?
Canadian Solar CS7N-645MS has a module efficiency of 20.80%, 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-645MS use vs Canadian Solar CS6L-455MS?
Canadian Solar CS7N-645MS 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-645MS and Canadian Solar CS6L-455MS?
Canadian Solar CS7N-645MS 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.

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.