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CS7N-640MB-AG vs CS3W-445MB-AG 5 of 18 identical Swap Change panels

Canadian Solar CS7N-640MB-AG vs Canadian Solar CS3W-445MB-AG

Canadian Solar CS7N-640MB-AG
CS7N-640MB-AG
640 Wp 20.60 % PERC Bifacial
Open panel page Datasheet PDF
VS
Canadian Solar CS3W-445MB-AG
CS3W-445MB-AG
445 Wp 19.90 % PERC Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

CS7N-640MB-AG leads on the differences that matter

The largest is module efficiency: 0.70 pp more efficient. 5 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 13 differences
How alike are they
5 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

13 of 18 parameters
Parameter CS7N-640MB-AG CS3W-445MB-AG Difference
Module efficiency 20.60 % 19.90 % 0.70 pp more efficient
Rated power 640 Wp 445 Wp 195 W more power
Weight 37.9 kg 28.4 kg 9.5 kg lighter
Power density 206.0 Wp/m² 199.2 Wp/m² 6.9 Wp/m² higher
Open-circuit voltage 44.60 V 48.90 V 4.30 V apart
Short-circuit current 18.31 A 11.54 A 6.77 A apart
Module area 3.106 m² 2.234 m² 0.872 m² apart
Weight per kWp 59.2 kg/kWp 63.8 kg/kWp 4.6 kg/kWp lighter
Temperature coefficient -0.340 %/°C -0.350 %/°C 0.010 %/°C better in heat
Current at max power 17.07 A 10.89 A 6.18 A apart
Cell count 132 144 12 cells apart
Voltage at max power 37.50 V 40.90 V 3.40 V apart
Dimensions 2384x1303x35 mm 2132x1048x30 mm 2384x1303x35 mm vs 2132x1048x30 mm
02

What it means on a roof

Thirty years of production
A 1.0% first-year loss then 0.40% a year, assumed for both panels, at 1,200 kWh/kWp a year
CS7N-640MB-AG
21,473 kWh
CS3W-445MB-AG
14,931 kWh
Lifetime gap
6,542 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario CS7N-640MB-AG CS3W-445MB-AG
Standard test conditions 25 °C 100.0% of rated power 640 W 445 W
Cool, bright day 40 °C 94.8% of rated power 607 W 422 W
Typical summer roof 55 °C 89.5% of rated power 575 W 398 W
Hot roof 70 °C 84.2% of rated power 542 W 375 W
03

Full specification

Parameter CS7N-640MB-AG CS3W-445MB-AG Difference
Power and efficiency
Rated power 640 Wp 445 Wp +195 W for CS7N-640MB-AG
Module efficiency 20.60 % 19.90 % +0.70 pp for CS7N-640MB-AG
Power density 206.0 Wp/m² 199.2 Wp/m² +6.9 Wp/m² for CS7N-640MB-AG
Open-circuit voltage 44.60 V 48.90 V 4.30 V apart
Voltage at max power 37.50 V 40.90 V 3.40 V apart
Short-circuit current 18.31 A 11.54 A 6.77 A apart
Current at max power 17.07 A 10.89 A 6.18 A apart
Temperature
Temperature coefficient -0.340 %/°C -0.350 %/°C +0.010 %/°C for CS7N-640MB-AG
Mechanical
Dimensions 2384x1303x35 mm 2132x1048x30 mm 2384x1303x35 mm vs 2132x1048x30 mm
Module area 3.106 m² 2.234 m² 0.872 m² apart
Weight 37.9 kg 28.4 kg -9.5 kg for CS3W-445MB-AG
Weight per kWp 59.2 kg/kWp 63.8 kg/kWp -4.6 kg/kWp for CS7N-640MB-AG
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.45 %/yr - Not published by Canadian Solar
Technology
Cell technology PERC PERC Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 144 12 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#11,093 vs #12,331
CS7N-640MB-AG leads by 1,238 places
Power density
#11,100 vs #12,319
CS7N-640MB-AG leads by 1,219 places
Heat behaviour
#8,778 vs #10,419
CS7N-640MB-AG leads by 1,641 places
Weight
#12,053 vs #12,932
CS7N-640MB-AG leads by 879 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#4,656 vs #11,245
CS7N-640MB-AG leads by 6,589 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-660MB-AG
3 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
06

Written summary

07

Questions about this pairing

Which panel is better: Canadian Solar CS7N-640MB-AG or Canadian Solar CS3W-445MB-AG?
According to our database: Canadian Solar CS7N-640MB-AG has higher module efficiency (20.60% vs 19.90%); Canadian Solar CS7N-640MB-AG tolerates heat better (temp coeff -0.340%/°C vs -0.350%/°C). 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 CS3W-445MB-AG?
Canadian Solar CS7N-640MB-AG has a module efficiency of 20.60%, while Canadian Solar CS3W-445MB-AG is 19.90%. 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 CS3W-445MB-AG?
Canadian Solar CS7N-640MB-AG uses PERC cells; Canadian Solar CS3W-445MB-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 CS3W-445MB-AG?
Canadian Solar CS7N-640MB-AG has a 30 years power warranty; Canadian Solar CS3W-445MB-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 CS3W-445MB-AG bifacial panels?
Both Canadian Solar CS7N-640MB-AG and Canadian Solar CS3W-445MB-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.