Skip to main content
JAM60D41-510/LB vs JAM66D45-620/LB 10 of 19 identical Swap Change panels

JA Solar JAM60D41-510/LB vs JA Solar JAM66D45-620/LB

JAM60D41-510/LB
510 Wp 23.00 % 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

9 differences, and they point both ways

The largest is rated power: 110 W more power. 10 of 19 comparable parameters are identical.

See all 9 differences
How alike are they
10 of 19 comparable
parameters are identical
identical differs
01

What actually differs

9 of 19 parameters
Parameter JAM60D41-510/LB JAM66D45-620/LB Difference
Rated power 510 Wp 620 Wp 110 W more power
Weight 27.3 kg 33.1 kg 5.8 kg lighter
Open-circuit voltage 44.25 V 48.50 V 4.25 V apart
Module area 2.215 m² 2.701 m² 0.486 m² apart
Short-circuit current 14.54 A 16.13 A 1.59 A apart
Cell count 120 132 12 cells apart
Current at max power 13.67 A 15.42 A 1.75 A apart
Voltage at max power 37.31 V 40.21 V 2.90 V apart
Dimensions 1953x1134x30 mm 2382x1134x30 mm 1953x1134x30 mm vs 2382x1134x30 mm
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.
JAM60D41-510/LB
17,112 kWh
JAM66D45-620/LB
20,802 kWh
Lifetime gap
3,690 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM60D41-510/LB JAM66D45-620/LB
Standard test conditions 25 °C 100.0% of rated power 510 W 620 W
Cool, bright day 40 °C 95.7% of rated power 488 W 593 W
Typical summer roof 55 °C 91.3% of rated power 466 W 566 W
Hot roof 70 °C 87.0% of rated power 443 W 539 W
03

Full specification

Parameter JAM60D41-510/LB JAM66D45-620/LB Difference
Power and efficiency
Rated power 510 Wp 620 Wp +110 W for JAM66D45-620/LB
Module efficiency 23.00 % 23.00 % Same
Power density 230.3 Wp/m² 229.5 Wp/m² Effectively the same
Open-circuit voltage 44.25 V 48.50 V 4.25 V apart
Voltage at max power 37.31 V 40.21 V 2.90 V apart
Short-circuit current 14.54 A 16.13 A 1.59 A apart
Current at max power 13.67 A 15.42 A 1.75 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 1953x1134x30 mm 2382x1134x30 mm 1953x1134x30 mm vs 2382x1134x30 mm
Module area 2.215 m² 2.701 m² 0.486 m² apart
Weight 27.3 kg 33.1 kg -5.8 kg for JAM60D41-510/LB
Weight per kWp 53.5 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 120 132 12 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#1,919 vs #1,919
Tied - the same position in the database
Power density
#1,849 vs #2,191
JAM60D41-510/LB leads by 342 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#7,509 vs #7,289
JAM66D45-620/LB leads by 220 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#6,280 vs #2,537
JAM66D45-620/LB leads by 3,743 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM60D41-510/LB vs JA Solar JAM66D45-630/LB
10 differences, the largest is rated power
Same series, other bin
JA Solar JAM60D41-510/LB vs JA Solar JAM66D45-625/LB
9 differences, the largest is rated power
Same series, other bin
JA Solar JAM60D41-510/LB vs JA Solar JAM66D45-615/LB
10 differences, the largest is rated power
Same series, other bin
JA Solar JAM60D41-510/LB vs JA Solar JAM66D45-610/LB
11 differences, the largest is rated power
Same series, other bin
JA Solar JAM60D41-510/LB vs JA Solar JAM66D45-605/LB
11 differences, the largest is rated power
Same series, other bin
JA Solar JAM60D41-510/LB vs JA Solar JAM60D41-505/LB
One difference: module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM60D41-510/LB or JA Solar JAM66D45-620/LB?
According to our database: both panels are closely matched on key specs - the decision often comes down to price and local availability. See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM60D41-510/LB and JA Solar JAM66D45-620/LB?
JA Solar JAM60D41-510/LB has a module efficiency of 23.00%, 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 JAM60D41-510/LB use vs JA Solar JAM66D45-620/LB?
JA Solar JAM60D41-510/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 JAM60D41-510/LB and JA Solar JAM66D45-620/LB?
JA Solar JAM60D41-510/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 JAM60D41-510/LB and JA Solar JAM66D45-620/LB bifacial panels?
Both JA Solar JAM60D41-510/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 394 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.