Skip to main content
645 vs 620 15 of 19 identical Swap Change panels

Canadian Solar CS6.2-66HB-645 vs Canadian Solar CS6.2-66HB-620

Canadian Solar CS6.2-66HB-645
CS6.2-66HB-645
645 Wp 23.90 % 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

645 leads on the differences that matter

The largest is module efficiency: 0.90 pp more efficient. 15 of 19 comparable parameters are identical.

See all 4 differences
How alike are they
15 of 19 comparable
parameters are identical
identical differs
01

What actually differs

4 of 19 parameters
Parameter 645 620 Difference
Module efficiency 23.90 % 23.00 % 0.90 pp more efficient
Power density 238.8 Wp/m² 229.5 Wp/m² 9.3 Wp/m² higher
Rated power 645 Wp 620 Wp 25 W more power
Weight per kWp 50.9 kg/kWp 52.9 kg/kWp 2.1 kg/kWp lighter
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.
645
21,978 kWh
620
21,126 kWh
Lifetime gap
852 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 645 620
Standard test conditions 25 °C 100.0% of rated power 645 W 620 W
Cool, bright day 40 °C 96.4% of rated power 622 W 598 W
Typical summer roof 55 °C 92.8% of rated power 599 W 575 W
Hot roof 70 °C 89.2% of rated power 575 W 553 W
03

Full specification

Parameter 645 620 Difference
Power and efficiency
Rated power 645 Wp 620 Wp +25 W for 645
Module efficiency 23.90 % 23.00 % +0.90 pp for 645
Power density 238.8 Wp/m² 229.5 Wp/m² +9.3 Wp/m² for 645
Open-circuit voltage 50.40 V 50.10 V Effectively the same
Voltage at max power 42.80 V 42.60 V Effectively the same
Short-circuit current 16.13 A 15.65 A Effectively the same
Current at max power 15.07 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 50.9 kg/kWp 52.9 kg/kWp -2.1 kg/kWp for 645
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
#378 vs #1,970
645 leads by 1,592 places
Power density
#383 vs #2,243
645 leads by 1,860 places
Heat behaviour
#13 vs #13
Tied - the same position in the database
Weight
#4,269 vs #6,673
645 leads by 2,404 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,087 vs #2,057
645 leads by 970 places
05

More useful comparisons

Open the full database
Same series, other bin
Canadian Solar CS6.2-66HB-645 vs Canadian Solar CS6.2-66HB-640
One difference: module efficiency
Same series, other bin
Canadian Solar CS6.2-66HB-645 vs Canadian Solar CS6.2-66HB-635
3 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS6.2-66HB-645 vs Canadian Solar CS6.2-66HB-630
3 differences, the largest is module efficiency
Same series, other bin
Canadian Solar CS6.2-66HB-645 vs Canadian Solar CS6.2-66HB-625
3 differences, the largest is module efficiency
Same manufacturer
Canadian Solar CS6.2-66HB-645 vs Canadian Solar CS7N-730TB-AG
14 differences, the largest is temperature coefficient
Same manufacturer
Canadian Solar CS6.2-66HB-645 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-645 or Canadian Solar CS6.2-66HB-620?
According to our database: Canadian Solar CS6.2-66HB-645 has higher module efficiency (23.90% 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-645 and Canadian Solar CS6.2-66HB-620?
Canadian Solar CS6.2-66HB-645 has a module efficiency of 23.90%, 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-645 use vs Canadian Solar CS6.2-66HB-620?
Canadian Solar CS6.2-66HB-645 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-645 and Canadian Solar CS6.2-66HB-620?
Canadian Solar CS6.2-66HB-645 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-645 and Canadian Solar CS6.2-66HB-620 bifacial panels?
Both Canadian Solar CS6.2-66HB-645 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.

Shop prices: See 30 Canadian Solar offers

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.