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640MB-AG vs 660MB-AG 16 of 19 identical Swap Change panels

Canadian Solar CS7N-640MB-AG vs Canadian Solar CS7N-660MB-AG

Canadian Solar CS7N-640MB-AG
CS7N-640MB-AG
640 Wp 20.60 % PERC Bifacial
Open panel page Datasheet PDF
VS
Canadian Solar CS7N-660MB-AG
CS7N-660MB-AG
660 Wp 21.20 % PERC Bifacial
Open panel page Datasheet PDF
The verdict

660MB-AG leads on the differences that matter

The largest is module efficiency: 0.60 pp more efficient. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter 640MB-AG 660MB-AG Difference
Module efficiency 20.60 % 21.20 % 0.60 pp more efficient
Power density 206.0 Wp/m² 212.5 Wp/m² 6.4 Wp/m² higher
Rated power 640 Wp 660 Wp 20 W more power
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.
640MB-AG
21,076 kWh
660MB-AG
21,734 kWh
Lifetime gap
658 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 640MB-AG 660MB-AG
Standard test conditions 25 °C 100.0% of rated power 640 W 660 W
Cool, bright day 40 °C 94.9% of rated power 607 W 626 W
Typical summer roof 55 °C 89.8% of rated power 575 W 593 W
Hot roof 70 °C 84.7% of rated power 542 W 559 W
03

Full specification

Parameter 640MB-AG 660MB-AG Difference
Power and efficiency
Rated power 640 Wp 660 Wp +20 W for 660MB-AG
Module efficiency 20.60 % 21.20 % +0.60 pp for 660MB-AG
Power density 206.0 Wp/m² 212.5 Wp/m² +6.4 Wp/m² for 660MB-AG
Open-circuit voltage 44.60 V 45.40 V Effectively the same
Voltage at max power 37.50 V 38.30 V Effectively the same
Short-circuit current 18.31 A 18.47 A Effectively the same
Current at max power 17.07 A 17.24 A Effectively the same
Temperature
Temperature coefficient -0.340 %/°C -0.340 %/°C Same
Mechanical
Dimensions 2384x1303x35 mm 2384x1303x35 mm Same
Module area 3.106 m² 3.106 m² Same
Weight 37.9 kg 37.9 kg Same
Weight per kWp 59.2 kg/kWp 57.4 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.45 %/yr 0.45 %/yr Same
Technology
Cell technology PERC PERC Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#11,093 vs #9,076
660MB-AG leads by 2,017 places
Power density
#11,100 vs #8,959
660MB-AG leads by 2,141 places
Heat behaviour
#8,778 vs #8,778
Tied - the same position in the database
Weight
#12,053 vs #11,206
660MB-AG leads by 847 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#4,656 vs #3,228
660MB-AG leads by 1,428 places
05

More useful comparisons

Open the full database
Same series, other bin
Canadian Solar CS7N-640MB-AG vs Canadian Solar CS7N-670MB-AG
7 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS7N-640MB-AG vs Canadian Solar CS7N-665MB-AG
6 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS7N-640MB-AG vs Canadian Solar CS7N-655MB-AG
3 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS7N-640MB-AG vs Canadian Solar CS7N-650MB-AG
3 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS7N-640MB-AG vs Canadian Solar CS7N-645MB-AG
One difference: module efficiency
Same series, other bin
Canadian Solar CS7N-640MB-AG vs Canadian Solar CS7L-610MB-AG
10 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Canadian Solar CS7N-640MB-AG or Canadian Solar CS7N-660MB-AG?
According to our database: Canadian Solar CS7N-660MB-AG has higher module efficiency (21.20% vs 20.60%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Canadian Solar CS7N-640MB-AG and Canadian Solar CS7N-660MB-AG?
Canadian Solar CS7N-640MB-AG has a module efficiency of 20.60%, while Canadian Solar CS7N-660MB-AG is 21.20%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Canadian Solar CS7N-640MB-AG use vs Canadian Solar CS7N-660MB-AG?
Canadian Solar CS7N-640MB-AG uses PERC cells; Canadian Solar CS7N-660MB-AG 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-640MB-AG and Canadian Solar CS7N-660MB-AG?
Canadian Solar CS7N-640MB-AG has a 30 years power warranty; Canadian Solar CS7N-660MB-AG has a 30 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.
Are Canadian Solar CS7N-640MB-AG and Canadian Solar CS7N-660MB-AG bifacial panels?
Both Canadian Solar CS7N-640MB-AG and Canadian Solar CS7N-660MB-AG are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.

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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.