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670MB-AG vs 645MB-AG 12 of 19 identical Swap Change panels

Canadian Solar CS7N-670MB-AG vs Canadian Solar CS7N-645MB-AG

Canadian Solar CS7N-670MB-AG
CS7N-670MB-AG
670 Wp 21.60 % PERC Bifacial
Open panel page Datasheet PDF
VS
Canadian Solar CS7N-645MB-AG
CS7N-645MB-AG
645 Wp 20.80 % PERC Bifacial
Open panel page Datasheet PDF
The verdict

670MB-AG leads on the differences that matter

The largest is module efficiency: 0.80 pp more efficient. 12 of 19 comparable parameters are identical.

See all 7 differences
How alike are they
12 of 19 comparable
parameters are identical
identical differs
01

What actually differs

7 of 19 parameters
Parameter 670MB-AG 645MB-AG Difference
Module efficiency 21.60 % 20.80 % 0.80 pp more efficient
Power density 215.7 Wp/m² 207.6 Wp/m² 8.0 Wp/m² higher
Rated power 670 Wp 645 Wp 25 W more power
Weight per kWp 56.4 kg/kWp 58.8 kg/kWp 2.3 kg/kWp lighter
Open-circuit voltage 45.80 V 44.80 V 1.00 V apart
Dimensions 2384x1303x33 mm 2384x1303x35 mm 2384x1303x33 mm vs 2384x1303x35 mm
Voltage at max power 38.70 V 37.70 V 1.00 V apart
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.
670MB-AG
22,064 kWh
645MB-AG
21,240 kWh
Lifetime gap
824 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 670MB-AG 645MB-AG
Standard test conditions 25 °C 100.0% of rated power 670 W 645 W
Cool, bright day 40 °C 94.9% of rated power 636 W 612 W
Typical summer roof 55 °C 89.8% of rated power 602 W 579 W
Hot roof 70 °C 84.7% of rated power 567 W 546 W
03

Full specification

Parameter 670MB-AG 645MB-AG Difference
Power and efficiency
Rated power 670 Wp 645 Wp +25 W for 670MB-AG
Module efficiency 21.60 % 20.80 % +0.80 pp for 670MB-AG
Power density 215.7 Wp/m² 207.6 Wp/m² +8.0 Wp/m² for 670MB-AG
Open-circuit voltage 45.80 V 44.80 V 1.00 V apart
Voltage at max power 38.70 V 37.70 V 1.00 V apart
Short-circuit current 18.55 A 18.35 A Effectively the same
Current at max power 17.32 A 17.11 A Effectively the same
Temperature
Temperature coefficient -0.340 %/°C -0.340 %/°C Same
Mechanical
Dimensions 2384x1303x33 mm 2384x1303x35 mm 2384x1303x33 mm vs 2384x1303x35 mm
Module area 3.106 m² 3.106 m² Same
Weight 37.8 kg 37.9 kg Effectively the same
Weight per kWp 56.4 kg/kWp 58.8 kg/kWp -2.3 kg/kWp for 670MB-AG
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
#7,652 vs #10,457
670MB-AG leads by 2,805 places
Power density
#7,644 vs #10,562
670MB-AG leads by 2,918 places
Heat behaviour
#8,778 vs #8,778
Tied - the same position in the database
Weight
#10,647 vs #11,888
670MB-AG leads by 1,241 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,462 vs #4,248
670MB-AG leads by 1,786 places
05

More useful comparisons

Open the full database
Same series, other bin
Canadian Solar CS7N-670MB-AG vs Canadian Solar CS7N-665MB-AG
2 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS7N-670MB-AG vs Canadian Solar CS7N-660MB-AG
4 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS7N-670MB-AG vs Canadian Solar CS7N-655MB-AG
4 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS7N-670MB-AG vs Canadian Solar CS7N-650MB-AG
4 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS7N-670MB-AG vs Canadian Solar CS7N-640MB-AG
7 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS7N-670MB-AG vs Canadian Solar CS7L-610MB-AG
7 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Canadian Solar CS7N-670MB-AG or Canadian Solar CS7N-645MB-AG?
According to our database: Canadian Solar CS7N-670MB-AG has higher module efficiency (21.60% 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-670MB-AG and Canadian Solar CS7N-645MB-AG?
Canadian Solar CS7N-670MB-AG has a module efficiency of 21.60%, while Canadian Solar CS7N-645MB-AG is 20.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Canadian Solar CS7N-670MB-AG use vs Canadian Solar CS7N-645MB-AG?
Canadian Solar CS7N-670MB-AG uses PERC cells; Canadian Solar CS7N-645MB-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-670MB-AG and Canadian Solar CS7N-645MB-AG?
Canadian Solar CS7N-670MB-AG has a 30 years power warranty; Canadian Solar CS7N-645MB-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-670MB-AG and Canadian Solar CS7N-645MB-AG bifacial panels?
Both Canadian Solar CS7N-670MB-AG and Canadian Solar CS7N-645MB-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.