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590/MB vs 585/MB 18 of 19 identical Swap Change panels

JA Solar JAM66D42-590/MB vs JA Solar JAM66D42-585/MB

JA Solar JAM66D42-590/MB
JAM66D42-590/MB
590 Wp 22.80 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
JA Solar JAM66D42-585/MB
JAM66D42-585/MB
585 Wp 22.60 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

590/MB 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 590/MB 585/MB Difference
Module efficiency 22.80 % 22.60 % 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 (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
590/MB
19,796 kWh
585/MB
19,628 kWh
Lifetime gap
168 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 590/MB 585/MB
Standard test conditions 25 °C 100.0% of rated power 590 W 585 W
Cool, bright day 40 °C 95.7% of rated power 564 W 560 W
Typical summer roof 55 °C 91.3% of rated power 539 W 534 W
Hot roof 70 °C 87.0% of rated power 513 W 509 W
03

Full specification

Parameter 590/MB 585/MB Difference
Power and efficiency
Rated power 590 Wp 585 Wp Effectively the same
Module efficiency 22.80 % 22.60 % +0.20 pp for 590/MB
Power density 228.4 Wp/m² 226.5 Wp/m² Effectively the same
Open-circuit voltage 48.58 V 48.38 V Effectively the same
Voltage at max power 40.84 V 40.63 V Effectively the same
Short-circuit current 15.31 A 15.26 A Effectively the same
Current at max power 14.45 A 14.40 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2278x1134x30 mm 2278x1134x30 mm Same
Module area 2.583 m² 2.583 m² Same
Weight 31.8 kg 31.8 kg Same
Weight per kWp 53.9 kg/kWp 54.4 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

14,129 panels
Efficiency
#2,769 vs #3,716
590/MB leads by 947 places
Power density
#2,653 vs #3,557
590/MB leads by 904 places
Heat behaviour
#2,220 vs #2,220
Tied - the same position in the database
Weight
#8,099 vs #8,749
590/MB leads by 650 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#3,852 vs #4,254
590/MB leads by 402 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM66D42-590/MB vs JA Solar JAM66D42-605/MB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D42-590/MB vs JA Solar JAM66D42-600/MB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D42-590/MB vs JA Solar JAM66D42-595/MB
One difference: module efficiency
Same series, other bin
JA Solar JAM66D42-590/MB vs JA Solar JAM66D42-580/MB
3 differences, the largest is module efficiency
Same manufacturer
JA Solar JAM66D42-590/MB vs JA Solar JAM66D46-740/LB
11 differences, the largest is module efficiency
Same manufacturer
JA Solar JAM66D42-590/MB vs JA Solar JAM66D46-735/LB
9 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM66D42-590/MB or JA Solar JAM66D42-585/MB?
According to our database: JA Solar JAM66D42-590/MB has higher module efficiency (22.80% vs 22.60%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM66D42-590/MB and JA Solar JAM66D42-585/MB?
JA Solar JAM66D42-590/MB has a module efficiency of 22.80%, while JA Solar JAM66D42-585/MB is 22.60%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM66D42-590/MB use vs JA Solar JAM66D42-585/MB?
JA Solar JAM66D42-590/MB uses TOPCon cells; JA Solar JAM66D42-585/MB 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 JAM66D42-590/MB and JA Solar JAM66D42-585/MB?
JA Solar JAM66D42-590/MB has a 30 years power warranty; JA Solar JAM66D42-585/MB 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 JAM66D42-590/MB and JA Solar JAM66D42-585/MB bifacial panels?
Both JA Solar JAM66D42-590/MB and JA Solar JAM66D42-585/MB 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 327 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.