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595/MB vs 580/MB 16 of 19 identical Swap Change panels

JA Solar JAM66D42-595/MB vs JA Solar JAM66D42-580/MB

JA Solar JAM66D42-595/MB
JAM66D42-595/MB
595 Wp 23.00 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
JA Solar JAM66D42-580/MB
JAM66D42-580/MB
580 Wp 22.50 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

595/MB leads on the differences that matter

The largest is module efficiency: 0.50 pp more efficient. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter 595/MB 580/MB Difference
Module efficiency 23.00 % 22.50 % 0.50 pp more efficient
Power density 230.3 Wp/m² 224.5 Wp/m² 5.8 Wp/m² higher
Rated power 595 Wp 580 Wp 15 W more power
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.
595/MB
19,963 kWh
580/MB
19,460 kWh
Lifetime gap
503 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 595/MB 580/MB
Standard test conditions 25 °C 100.0% of rated power 595 W 580 W
Cool, bright day 40 °C 95.7% of rated power 569 W 555 W
Typical summer roof 55 °C 91.3% of rated power 543 W 530 W
Hot roof 70 °C 87.0% of rated power 517 W 504 W
03

Full specification

Parameter 595/MB 580/MB Difference
Power and efficiency
Rated power 595 Wp 580 Wp +15 W for 595/MB
Module efficiency 23.00 % 22.50 % +0.50 pp for 595/MB
Power density 230.3 Wp/m² 224.5 Wp/m² +5.8 Wp/m² for 595/MB
Open-circuit voltage 48.78 V 48.18 V Effectively the same
Voltage at max power 41.03 V 40.42 V Effectively the same
Short-circuit current 15.36 A 15.21 A Effectively the same
Current at max power 14.50 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 53.4 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

Against the whole database

14,129 panels
Efficiency
#1,970 vs #4,281
595/MB leads by 2,311 places
Power density
#1,809 vs #4,607
595/MB leads by 2,798 places
Heat behaviour
#2,220 vs #2,220
Tied - the same position in the database
Weight
#7,445 vs #9,304
595/MB leads by 1,859 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#3,414 vs #4,552
595/MB leads by 1,138 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM66D42-595/MB vs JA Solar JAM66D42-605/MB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D42-595/MB vs JA Solar JAM66D42-600/MB
One difference: module efficiency
Same series, other bin
JA Solar JAM66D42-595/MB vs JA Solar JAM66D42-590/MB
One difference: module efficiency
Same series, other bin
JA Solar JAM66D42-595/MB vs JA Solar JAM66D42-585/MB
3 differences, the largest is module efficiency
Same manufacturer
JA Solar JAM66D42-595/MB vs JA Solar JAM66D46-740/LB
9 differences, the largest is module efficiency
Same manufacturer
JA Solar JAM66D42-595/MB vs JA Solar JAM66D46-735/LB
8 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM66D42-595/MB or JA Solar JAM66D42-580/MB?
According to our database: JA Solar JAM66D42-595/MB has higher module efficiency (23.00% 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 JAM66D42-595/MB and JA Solar JAM66D42-580/MB?
JA Solar JAM66D42-595/MB has a module efficiency of 23.00%, 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 JAM66D42-595/MB use vs JA Solar JAM66D42-580/MB?
JA Solar JAM66D42-595/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 JAM66D42-595/MB and JA Solar JAM66D42-580/MB?
JA Solar JAM66D42-595/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 JAM66D42-595/MB and JA Solar JAM66D42-580/MB bifacial panels?
Both JA Solar JAM66D42-595/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.