Skip to main content
JAM60D41 485/LB vs JAM60D42-520/LB 11 of 19 identical Swap Change panels

JA Solar JAM60D41 485/LB vs JA Solar JAM60D42-520/LB

JA Solar JAM60D41 485/LB
JAM60D41 485/LB
485 Wp 21.90 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
JA Solar JAM60D42-520/LB
JAM60D42-520/LB
520 Wp 22.20 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

JAM60D42-520/LB leads on the differences that matter

The largest is rated power: 35 W more power. 11 of 19 comparable parameters are identical.

See all 8 differences
How alike are they
11 of 19 comparable
parameters are identical
identical differs
01

What actually differs

8 of 19 parameters
Parameter JAM60D41 485/LB JAM60D42-520/LB Difference
Rated power 485 Wp 520 Wp 35 W more power
Module area 2.215 m² 2.339 m² 0.125 m² apart
Module efficiency 21.90 % 22.20 % 0.30 pp more efficient
Weight 27.3 kg 28.8 kg 1.5 kg lighter
Power density 219.0 Wp/m² 222.3 Wp/m² 3.3 Wp/m² higher
Short-circuit current 14.24 A 15.16 A 0.92 A apart
Dimensions 1953x1134x30 mm 2063x1134x30 mm 1953x1134x30 mm vs 2063x1134x30 mm
Current at max power 13.37 A 14.30 A 0.93 A 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 (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
JAM60D41 485/LB
16,273 kWh
JAM60D42-520/LB
17,447 kWh
Lifetime gap
1,174 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM60D41 485/LB JAM60D42-520/LB
Standard test conditions 25 °C 100.0% of rated power 485 W 520 W
Cool, bright day 40 °C 95.7% of rated power 464 W 497 W
Typical summer roof 55 °C 91.3% of rated power 443 W 475 W
Hot roof 70 °C 87.0% of rated power 422 W 452 W
03

Full specification

Parameter JAM60D41 485/LB JAM60D42-520/LB Difference
Power and efficiency
Rated power 485 Wp 520 Wp +35 W for JAM60D42-520/LB
Module efficiency 21.90 % 22.20 % +0.30 pp for JAM60D42-520/LB
Power density 219.0 Wp/m² 222.3 Wp/m² +3.3 Wp/m² for JAM60D42-520/LB
Open-circuit voltage 43.25 V 43.53 V Effectively the same
Voltage at max power 36.28 V 36.37 V Effectively the same
Short-circuit current 14.24 A 15.16 A 0.92 A apart
Current at max power 13.37 A 14.30 A 0.93 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 1953x1134x30 mm 2063x1134x30 mm 1953x1134x30 mm vs 2063x1134x30 mm
Module area 2.215 m² 2.339 m² 0.125 m² apart
Weight 27.3 kg 28.8 kg -1.5 kg for JAM60D41 485/LB
Weight per kWp 56.3 kg/kWp 55.4 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 120 120 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#6,783 vs #5,817
JAM60D42-520/LB leads by 966 places
Power density
#6,767 vs #5,730
JAM60D42-520/LB leads by 1,037 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#10,551 vs #9,816
JAM60D42-520/LB leads by 735 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#8,670 vs #6,938
JAM60D42-520/LB leads by 1,732 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM60D41 485/LB vs JA Solar JAM60D42-545/LB
11 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM60D41 485/LB vs JA Solar JAM60D42-540/LB
10 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM60D41 485/LB vs JA Solar JAM60D42-535/LB
9 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM60D41 485/LB vs JA Solar JAM60D42-530/LB
8 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM60D41 485/LB vs JA Solar JAM60D42-525/LB
8 differences, the largest is rated power
Same series, other bin
JA Solar JAM60D41 485/LB vs JA Solar JAM60D41 510/LB
6 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM60D41 485/LB or JA Solar JAM60D42-520/LB?
According to our database: JA Solar JAM60D42-520/LB has higher module efficiency (22.20% vs 21.90%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM60D41 485/LB and JA Solar JAM60D42-520/LB?
JA Solar JAM60D41 485/LB has a module efficiency of 21.90%, while JA Solar JAM60D42-520/LB is 22.20%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM60D41 485/LB use vs JA Solar JAM60D42-520/LB?
JA Solar JAM60D41 485/LB uses TOPCon cells; JA Solar JAM60D42-520/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 485/LB and JA Solar JAM60D42-520/LB?
JA Solar JAM60D41 485/LB has a 30 years power warranty; JA Solar JAM60D42-520/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 485/LB and JA Solar JAM60D42-520/LB bifacial panels?
Both JA Solar JAM60D41 485/LB and JA Solar JAM60D42-520/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 389 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.