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640 vs 620 16 of 19 identical Swap Change panels

Canadian Solar CS6.2-66HB-640 vs Canadian Solar CS6.2-66HB-620

Canadian Solar CS6.2-66HB-640
CS6.2-66HB-640
640 Wp 23.70 % HJT Bifacial
Open panel page Datasheet PDF
VS
Canadian Solar CS6.2-66HB-620
CS6.2-66HB-620
620 Wp 23.00 % HJT Bifacial
Open panel page Datasheet PDF
The verdict

640 leads on the differences that matter

The largest is module efficiency: 0.70 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 640 620 Difference
Module efficiency 23.70 % 23.00 % 0.70 pp more efficient
Power density 236.9 Wp/m² 229.5 Wp/m² 7.4 Wp/m² higher
Rated power 640 Wp 620 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 (-0.240 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
640
21,807 kWh
620
21,126 kWh
Lifetime gap
681 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 640 620
Standard test conditions 25 °C 100.0% of rated power 640 W 620 W
Cool, bright day 40 °C 96.4% of rated power 617 W 598 W
Typical summer roof 55 °C 92.8% of rated power 594 W 575 W
Hot roof 70 °C 89.2% of rated power 571 W 553 W
03

Full specification

Parameter 640 620 Difference
Power and efficiency
Rated power 640 Wp 620 Wp +20 W for 640
Module efficiency 23.70 % 23.00 % +0.70 pp for 640
Power density 236.9 Wp/m² 229.5 Wp/m² +7.4 Wp/m² for 640
Open-circuit voltage 50.40 V 50.10 V Effectively the same
Voltage at max power 42.70 V 42.60 V Effectively the same
Short-circuit current 16.01 A 15.65 A Effectively the same
Current at max power 14.99 A 14.58 A Effectively the same
Temperature
Temperature coefficient -0.240 %/°C -0.240 %/°C Same
Mechanical
Dimensions 2382x1134x30 mm 2382x1134x30 mm Same
Module area 2.701 m² 2.701 m² Same
Weight 32.8 kg 32.8 kg Same
Weight per kWp 51.2 kg/kWp 52.9 kg/kWp Effectively the same
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.30 %/yr 0.30 %/yr Same
Technology
Cell technology HJT HJT Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#549 vs #1,970
640 leads by 1,421 places
Power density
#553 vs #2,243
640 leads by 1,690 places
Heat behaviour
#13 vs #13
Tied - the same position in the database
Weight
#4,663 vs #6,673
640 leads by 2,010 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,276 vs #2,057
640 leads by 781 places
05

More useful comparisons

Open the full database
Same series, other bin
Canadian Solar CS6.2-66HB-640 vs Canadian Solar CS6.2-66HB-645
One difference: module efficiency
Same series, other bin
Canadian Solar CS6.2-66HB-640 vs Canadian Solar CS6.2-66HB-635
One difference: module efficiency
Same series, other bin
Canadian Solar CS6.2-66HB-640 vs Canadian Solar CS6.2-66HB-630
3 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS6.2-66HB-640 vs Canadian Solar CS6.2-66HB-625
3 differences, the largest is module efficiency
Same manufacturer
Canadian Solar CS6.2-66HB-640 vs Canadian Solar CS7N-730TB-AG
13 differences, the largest is temperature coefficient
Same manufacturer
Canadian Solar CS6.2-66HB-640 vs Canadian Solar CS7N-725TB-AG
14 differences, the largest is temperature coefficient
06

Written summary

07

Questions about this pairing

Which panel is better: Canadian Solar CS6.2-66HB-640 or Canadian Solar CS6.2-66HB-620?
According to our database: Canadian Solar CS6.2-66HB-640 has higher module efficiency (23.70% vs 23.00%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Canadian Solar CS6.2-66HB-640 and Canadian Solar CS6.2-66HB-620?
Canadian Solar CS6.2-66HB-640 has a module efficiency of 23.70%, while Canadian Solar CS6.2-66HB-620 is 23.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Canadian Solar CS6.2-66HB-640 use vs Canadian Solar CS6.2-66HB-620?
Canadian Solar CS6.2-66HB-640 uses HJT cells; Canadian Solar CS6.2-66HB-620 uses HJT. 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 CS6.2-66HB-640 and Canadian Solar CS6.2-66HB-620?
Canadian Solar CS6.2-66HB-640 has a 30 years power warranty; Canadian Solar CS6.2-66HB-620 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 CS6.2-66HB-640 and Canadian Solar CS6.2-66HB-620 bifacial panels?
Both Canadian Solar CS6.2-66HB-640 and Canadian Solar CS6.2-66HB-620 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.