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540/LB vs 520/LB 15 of 19 identical Swap Change panels

JA Solar JAM60D42-540/LB vs JA Solar JAM60D42-520/LB

JA Solar JAM60D42-540/LB
JAM60D42-540/LB
540 Wp 23.10 % 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

540/LB 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 540/LB 520/LB Difference
Module efficiency 23.10 % 22.20 % 0.90 pp more efficient
Power density 230.8 Wp/m² 222.3 Wp/m² 8.5 Wp/m² higher
Rated power 540 Wp 520 Wp 20 W more power
Weight per kWp 53.3 kg/kWp 55.4 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 (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
540/LB
18,118 kWh
520/LB
17,447 kWh
Lifetime gap
671 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 540/LB 520/LB
Standard test conditions 25 °C 100.0% of rated power 540 W 520 W
Cool, bright day 40 °C 95.7% of rated power 517 W 497 W
Typical summer roof 55 °C 91.3% of rated power 493 W 475 W
Hot roof 70 °C 87.0% of rated power 470 W 452 W
03

Full specification

Parameter 540/LB 520/LB Difference
Power and efficiency
Rated power 540 Wp 520 Wp +20 W for 540/LB
Module efficiency 23.10 % 22.20 % +0.90 pp for 540/LB
Power density 230.8 Wp/m² 222.3 Wp/m² +8.5 Wp/m² for 540/LB
Open-circuit voltage 44.33 V 43.53 V Effectively the same
Voltage at max power 37.25 V 36.37 V Effectively the same
Short-circuit current 15.36 A 15.16 A Effectively the same
Current at max power 14.50 A 14.30 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2063x1134x30 mm 2063x1134x30 mm Same
Module area 2.339 m² 2.339 m² Same
Weight 28.8 kg 28.8 kg Same
Weight per kWp 53.3 kg/kWp 55.4 kg/kWp -2.1 kg/kWp for 540/LB
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
#1,570 vs #5,817
540/LB leads by 4,247 places
Power density
#1,649 vs #5,730
540/LB leads by 4,081 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#7,178 vs #9,816
540/LB leads by 2,638 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#5,107 vs #6,938
540/LB leads by 1,831 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM60D42-540/LB vs JA Solar JAM60D42-545/LB
One difference: module efficiency
Same series, other bin
JA Solar JAM60D42-540/LB vs JA Solar JAM60D42-535/LB
One difference: module efficiency
Same series, other bin
JA Solar JAM60D42-540/LB vs JA Solar JAM60D42-530/LB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM60D42-540/LB vs JA Solar JAM60D42-525/LB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM60D42-540/LB vs JA Solar JAM60D41 510/LB
6 differences, the largest is rated power
Same series, other bin
JA Solar JAM60D42-540/LB vs JA Solar JAM60D41-510/LB
6 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM60D42-540/LB or JA Solar JAM60D42-520/LB?
According to our database: JA Solar JAM60D42-540/LB has higher module efficiency (23.10% vs 22.20%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM60D42-540/LB and JA Solar JAM60D42-520/LB?
JA Solar JAM60D42-540/LB has a module efficiency of 23.10%, 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 JAM60D42-540/LB use vs JA Solar JAM60D42-520/LB?
JA Solar JAM60D42-540/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 JAM60D42-540/LB and JA Solar JAM60D42-520/LB?
JA Solar JAM60D42-540/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 JAM60D42-540/LB and JA Solar JAM60D42-520/LB bifacial panels?
Both JA Solar JAM60D42-540/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 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.