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580/MB/1500V vs 585/MB/1500V 18 of 19 identical Swap Change panels

JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM78D30-585/MB/1500V

JAM78D30-580/MB/1500V
580 Wp 20.70 % PERC Bifacial
Open panel page Datasheet PDF
VS
JAM78D30-585/MB/1500V
585 Wp 20.90 % PERC Bifacial
Open panel page Datasheet PDF
The verdict

585/MB/1500V leads on the differences that matter

The largest is module efficiency: 0.20 pp more efficient. 18 of 19 comparable parameters are identical.

See the one difference
How alike are they
18 of 19 comparable
parameters are identical
identical differs
01

What actually differs

1 of 19 parameters
Parameter 580/MB/1500V 585/MB/1500V Difference
Module efficiency 20.70 % 20.90 % 0.20 pp more efficient
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 (-0.350 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
580/MB/1500V
19,100 kWh
585/MB/1500V
19,265 kWh
Lifetime gap
165 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 580/MB/1500V 585/MB/1500V
Standard test conditions 25 °C 100.0% of rated power 580 W 585 W
Cool, bright day 40 °C 94.8% of rated power 550 W 554 W
Typical summer roof 55 °C 89.5% of rated power 519 W 524 W
Hot roof 70 °C 84.2% of rated power 489 W 493 W
03

Full specification

Parameter 580/MB/1500V 585/MB/1500V Difference
Power and efficiency
Rated power 580 Wp 585 Wp Effectively the same
Module efficiency 20.70 % 20.90 % +0.20 pp for 585/MB/1500V
Power density 207.5 Wp/m² 209.3 Wp/m² Effectively the same
Open-circuit voltage 53.11 V 53.20 V Effectively the same
Voltage at max power 44.35 V 44.56 V Effectively the same
Short-circuit current 13.84 A 13.88 A Effectively the same
Current at max power 13.08 A 13.13 A Effectively the same
Temperature
Temperature coefficient -0.350 %/°C -0.350 %/°C Same
Mechanical
Dimensions 2465x1134x35 mm 2465x1134x35 mm Same
Module area 2.795 m² 2.795 m² Same
Weight 33.4 kg 33.4 kg Same
Weight per kWp 57.6 kg/kWp 57.1 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.45 %/yr 0.45 %/yr Same
Technology
Cell technology PERC PERC Same
Cell type Monocrystalline Monocrystalline Same
Cell count 156 156 Same
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#10,842 vs #10,148
585/MB/1500V leads by 694 places
Power density
#10,672 vs #10,074
585/MB/1500V leads by 598 places
Heat behaviour
#10,489 vs #10,489
Tied - the same position in the database
Weight
#11,388 vs #11,132
585/MB/1500V leads by 256 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#6,690 vs #6,198
585/MB/1500V leads by 492 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM78D30-605/MB/1500V
5 differences, the largest is module efficiency
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JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM78D30-600/MB/1500V
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JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM78D30-595/MB/1500V
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM78D30-590/MB/1500V
3 differences, the largest is module efficiency
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JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM72D30-580/LB/1500V
9 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM72D30-575/LB/1500V
9 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM78D30-580/MB/1500V or JA Solar JAM78D30-585/MB/1500V?
According to our database: JA Solar JAM78D30-585/MB/1500V has higher module efficiency (20.90% vs 20.70%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM78D30-580/MB/1500V and JA Solar JAM78D30-585/MB/1500V?
JA Solar JAM78D30-580/MB/1500V has a module efficiency of 20.70%, while JA Solar JAM78D30-585/MB/1500V is 20.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM78D30-580/MB/1500V use vs JA Solar JAM78D30-585/MB/1500V?
JA Solar JAM78D30-580/MB/1500V uses PERC cells; JA Solar JAM78D30-585/MB/1500V uses PERC. 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 JAM78D30-580/MB/1500V and JA Solar JAM78D30-585/MB/1500V?
JA Solar JAM78D30-580/MB/1500V has a 30 years power warranty; JA Solar JAM78D30-585/MB/1500V 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 JAM78D30-580/MB/1500V and JA Solar JAM78D30-585/MB/1500V bifacial panels?
Both JA Solar JAM78D30-580/MB/1500V and JA Solar JAM78D30-585/MB/1500V 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 330 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.