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CS7N-670MS vs CS6W-540MS 8 of 19 identical Swap Change panels

Canadian Solar CS7N-670MS vs Canadian Solar CS6W-540MS

Canadian Solar CS7N-670MS
CS7N-670MS
670 Wp 21.60 % PERC
Open panel page Datasheet PDF
VS
Canadian Solar CS6W-540MS
CS6W-540MS
540 Wp 20.90 % PERC
Open panel page Datasheet PDF
The verdict

CS7N-670MS leads on the differences that matter

The largest is module efficiency: 0.70 pp more efficient. 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-670MS CS6W-540MS Difference
Module efficiency 21.60 % 20.90 % 0.70 pp more efficient
Rated power 670 Wp 540 Wp 130 W more power
Weight 33.9 kg 27.6 kg 6.3 kg lighter
Power density 215.7 Wp/m² 209.0 Wp/m² 6.6 Wp/m² higher
Short-circuit current 18.55 A 13.90 A 4.65 A apart
Module area 3.106 m² 2.583 m² 0.523 m² apart
Open-circuit voltage 45.80 V 49.20 V 3.40 V apart
Current at max power 17.32 A 13.08 A 4.24 A apart
Cell count 132 144 12 cells apart
Voltage at max power 38.70 V 41.30 V 2.60 V apart
Dimensions 2384x1303x35 mm 2278x1134x30 mm 2384x1303x35 mm vs 2278x1134x30 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-670MS
21,714 kWh
CS6W-540MS
17,501 kWh
Lifetime gap
4,213 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario CS7N-670MS CS6W-540MS
Standard test conditions 25 °C 100.0% of rated power 670 W 540 W
Cool, bright day 40 °C 94.9% of rated power 636 W 512 W
Typical summer roof 55 °C 89.8% of rated power 602 W 485 W
Hot roof 70 °C 84.7% of rated power 567 W 457 W
03

Full specification

Parameter CS7N-670MS CS6W-540MS Difference
Power and efficiency
Rated power 670 Wp 540 Wp +130 W for CS7N-670MS
Module efficiency 21.60 % 20.90 % +0.70 pp for CS7N-670MS
Power density 215.7 Wp/m² 209.0 Wp/m² +6.6 Wp/m² for CS7N-670MS
Open-circuit voltage 45.80 V 49.20 V 3.40 V apart
Voltage at max power 38.70 V 41.30 V 2.60 V apart
Short-circuit current 18.55 A 13.90 A 4.65 A apart
Current at max power 17.32 A 13.08 A 4.24 A apart
Temperature
Temperature coefficient -0.340 %/°C -0.340 %/°C Same
Mechanical
Dimensions 2384x1303x35 mm 2278x1134x30 mm 2384x1303x35 mm vs 2278x1134x30 mm
Module area 3.106 m² 2.583 m² 0.523 m² apart
Weight 33.9 kg 27.6 kg -6.3 kg for CS6W-540MS
Weight per kWp 50.6 kg/kWp 51.1 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 132 144 12 cells apart
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#7,652 vs #10,072
CS7N-670MS leads by 2,420 places
Power density
#7,644 vs #10,100
CS7N-670MS leads by 2,456 places
Heat behaviour
#8,778 vs #8,778
Tied - the same position in the database
Weight
#4,014 vs #4,436
CS7N-670MS leads by 422 places
Warranty
#9,798 vs #9,798
Tied - the same position in the database
Overall
#3,373 vs #8,908
CS7N-670MS leads by 5,535 places
05

More useful comparisons

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

Written summary

07

Questions about this pairing

Which panel is better: Canadian Solar CS7N-670MS or Canadian Solar CS6W-540MS?
According to our database: Canadian Solar CS7N-670MS has higher module efficiency (21.60% 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 CS7N-670MS and Canadian Solar CS6W-540MS?
Canadian Solar CS7N-670MS has a module efficiency of 21.60%, while Canadian Solar CS6W-540MS is 20.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Canadian Solar CS7N-670MS use vs Canadian Solar CS6W-540MS?
Canadian Solar CS7N-670MS uses PERC cells; Canadian Solar CS6W-540MS 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-670MS and Canadian Solar CS6W-540MS?
Canadian Solar CS7N-670MS has a 25 years power warranty; Canadian Solar CS6W-540MS 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.