JA Solar JAM66D42-585/MB vs JA Solar JAM66D42-580/MB
VS
The verdict
Identical on every published parameter
All 19 comparable parameters agree. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from.
How alike are they
19
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
0 of 19 parameters
What actually differs
Every comparable parameter agrees. The full specification is below.
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.
585/MB
19,628 kWh
580/MB
19,460 kWh
Lifetime gap
168 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
585/MB
580/MB
Standard test conditions
25 °C
100.0% of rated power
585 W
580 W
Cool, bright day
40 °C
95.7% of rated power
560 W
555 W
Typical summer roof
55 °C
91.3% of rated power
534 W
530 W
Hot roof
70 °C
87.0% of rated power
509 W
504 W
03
Full specification
Parameter
585/MB
580/MB
Difference
Power and efficiency
Rated power
585 Wp
580 Wp
Effectively the same
Module efficiency
22.60 %
22.50 %
Effectively the same
Power density
226.5 Wp/m²
224.5 Wp/m²
Effectively the same
Open-circuit voltage
48.38 V
48.18 V
Effectively the same
Voltage at max power
40.63 V
40.42 V
Effectively the same
Short-circuit current
15.26 A
15.21 A
Effectively the same
Current at max power
14.40 A
14.35 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
54.4 kg/kWp
54.8 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
14,129 panels
Against the whole database
Efficiency
#3,716
vs
#4,281
585/MB leads by 565 places
Power density
#3,557
vs
#4,607
585/MB leads by 1,050 places
Heat behaviour
#2,220
vs
#2,220
Tied - the same position in the database
Weight
#8,749
vs
#9,304
585/MB leads by 555 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#4,254
vs
#4,552
585/MB leads by 298 places
05
Open the full database
More useful comparisons
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JA Solar JAM66D42-585/MB vs JA Solar JAM66D42-605/MB
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JA Solar JAM66D42-585/MB vs JA Solar JAM66D42-600/MB
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JA Solar JAM66D42-585/MB vs JA Solar JAM66D42-595/MB
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JA Solar JAM66D42-585/MB vs JA Solar JAM66D42-590/MB
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Same manufacturer
JA Solar JAM66D42-585/MB vs JA Solar JAM66D46-740/LB
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Same manufacturer
JA Solar JAM66D42-585/MB vs JA Solar JAM66D46-735/LB
11 differences, the largest is module efficiency
06
Written summary
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07
Questions about this pairing
Which panel is better: JA Solar JAM66D42-585/MB or JA Solar JAM66D42-580/MB?
According to our database: JA Solar JAM66D42-585/MB has higher module efficiency (22.60% vs 22.50%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM66D42-585/MB and JA Solar JAM66D42-580/MB?
JA Solar JAM66D42-585/MB has a module efficiency of 22.60%, while JA Solar JAM66D42-580/MB is 22.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM66D42-585/MB use vs JA Solar JAM66D42-580/MB?
JA Solar JAM66D42-585/MB uses TOPCon cells; JA Solar JAM66D42-580/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 JAM66D42-585/MB and JA Solar JAM66D42-580/MB?
JA Solar JAM66D42-585/MB has a 30 years power warranty; JA Solar JAM66D42-580/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 JAM66D42-585/MB and JA Solar JAM66D42-580/MB bifacial panels?
Both JA Solar JAM66D42-585/MB and JA Solar JAM66D42-580/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.