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605/LB vs 620/LB 16 of 19 identical Swap Change panels

JA Solar JAM66D45-605/LB vs JA Solar JAM66D45-620/LB

JA Solar JAM66D45-605/LB
JAM66D45-605/LB
605 Wp 22.40 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
JA Solar JAM66D45-620/LB
JAM66D45-620/LB
620 Wp 23.00 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

620/LB 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 605/LB 620/LB Difference
Module efficiency 22.40 % 23.00 % 0.60 pp more efficient
Power density 224.0 Wp/m² 229.5 Wp/m² 5.6 Wp/m² higher
Rated power 605 Wp 620 Wp 15 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 (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
605/LB
20,299 kWh
620/LB
20,802 kWh
Lifetime gap
503 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 605/LB 620/LB
Standard test conditions 25 °C 100.0% of rated power 605 W 620 W
Cool, bright day 40 °C 95.7% of rated power 579 W 593 W
Typical summer roof 55 °C 91.3% of rated power 552 W 566 W
Hot roof 70 °C 87.0% of rated power 526 W 539 W
03

Full specification

Parameter 605/LB 620/LB Difference
Power and efficiency
Rated power 605 Wp 620 Wp +15 W for 620/LB
Module efficiency 22.40 % 23.00 % +0.60 pp for 620/LB
Power density 224.0 Wp/m² 229.5 Wp/m² +5.6 Wp/m² for 620/LB
Open-circuit voltage 47.90 V 48.50 V Effectively the same
Voltage at max power 39.60 V 40.21 V Effectively the same
Short-circuit current 16.00 A 16.13 A Effectively the same
Current at max power 15.28 A 15.42 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2382x1134x30 mm 2382x1134x30 mm Same
Module area 2.701 m² 2.701 m² Same
Weight 33.1 kg 33.1 kg Same
Weight per kWp 54.7 kg/kWp 53.4 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#4,774 vs #1,919
620/LB leads by 2,855 places
Power density
#4,780 vs #2,191
620/LB leads by 2,589 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#9,097 vs #7,289
620/LB leads by 1,808 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#3,707 vs #2,537
620/LB leads by 1,170 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM66D45-605/LB vs JA Solar JAM66D45-630/LB
6 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D45-605/LB vs JA Solar JAM66D45-625/LB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D45-605/LB vs JA Solar JAM66D45-615/LB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D45-605/LB vs JA Solar JAM66D45-610/LB
One difference: module efficiency
Same series, other bin
JA Solar JAM66D45-605/LB vs JA Solar JAM72D30-580/LB/1500V
13 differences, the largest is temperature coefficient
Same series, other bin
JA Solar JAM66D45-605/LB vs JA Solar JAM72D30-575/LB/1500V
13 differences, the largest is temperature coefficient
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM66D45-605/LB or JA Solar JAM66D45-620/LB?
According to our database: JA Solar JAM66D45-620/LB has higher module efficiency (23.00% vs 22.40%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM66D45-605/LB and JA Solar JAM66D45-620/LB?
JA Solar JAM66D45-605/LB has a module efficiency of 22.40%, while JA Solar JAM66D45-620/LB is 23.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM66D45-605/LB use vs JA Solar JAM66D45-620/LB?
JA Solar JAM66D45-605/LB uses TOPCon cells; JA Solar JAM66D45-620/LB uses TOPCon. 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 JA Solar JAM66D45-605/LB and JA Solar JAM66D45-620/LB?
JA Solar JAM66D45-605/LB has a 30 years power warranty; JA Solar JAM66D45-620/LB 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 JA Solar JAM66D45-605/LB and JA Solar JAM66D45-620/LB bifacial panels?
Both JA Solar JAM66D45-605/LB and JA Solar JAM66D45-620/LB 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 340 JA 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.