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580/MB vs 605/MB 13 of 19 identical Swap Change panels

JA Solar JAM66D42-580/MB vs JA Solar JAM66D42-605/MB

JA Solar JAM66D42-580/MB
JAM66D42-580/MB
580 Wp 22.50 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
JA Solar JAM66D42-605/MB
JAM66D42-605/MB
605 Wp 23.40 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

605/MB leads on the differences that matter

The largest is module efficiency: 0.90 pp more efficient. 13 of 19 comparable parameters are identical.

See all 6 differences
How alike are they
13 of 19 comparable
parameters are identical
identical differs
01

What actually differs

6 of 19 parameters
Parameter 580/MB 605/MB Difference
Module efficiency 22.50 % 23.40 % 0.90 pp more efficient
Power density 224.5 Wp/m² 234.2 Wp/m² 9.7 Wp/m² higher
Rated power 580 Wp 605 Wp 25 W more power
Weight per kWp 54.8 kg/kWp 52.6 kg/kWp 2.3 kg/kWp lighter
Open-circuit voltage 48.18 V 49.19 V 1.01 V apart
Voltage at max power 40.42 V 41.44 V 1.02 V apart
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.
580/MB
19,460 kWh
605/MB
20,299 kWh
Lifetime gap
839 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 580/MB 605/MB
Standard test conditions 25 °C 100.0% of rated power 580 W 605 W
Cool, bright day 40 °C 95.7% of rated power 555 W 579 W
Typical summer roof 55 °C 91.3% of rated power 530 W 552 W
Hot roof 70 °C 87.0% of rated power 504 W 526 W
03

Full specification

Parameter 580/MB 605/MB Difference
Power and efficiency
Rated power 580 Wp 605 Wp +25 W for 605/MB
Module efficiency 22.50 % 23.40 % +0.90 pp for 605/MB
Power density 224.5 Wp/m² 234.2 Wp/m² +9.7 Wp/m² for 605/MB
Open-circuit voltage 48.18 V 49.19 V 1.01 V apart
Voltage at max power 40.42 V 41.44 V 1.02 V apart
Short-circuit current 15.21 A 15.46 A Effectively the same
Current at max power 14.35 A 14.60 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 54.8 kg/kWp 52.6 kg/kWp -2.3 kg/kWp for 605/MB
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
#4,281 vs #919
605/MB leads by 3,362 places
Power density
#4,607 vs #900
605/MB leads by 3,707 places
Heat behaviour
#2,220 vs #2,220
Tied - the same position in the database
Weight
#9,304 vs #6,237
605/MB leads by 3,067 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#4,552 vs #2,592
605/MB leads by 1,960 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM66D42-580/MB vs JA Solar JAM66D42-600/MB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D42-580/MB vs JA Solar JAM66D42-595/MB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D42-580/MB vs JA Solar JAM66D42-590/MB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D42-580/MB vs JA Solar JAM66D42-585/MB
The same specification on paper
Same manufacturer
JA Solar JAM66D42-580/MB vs JA Solar JAM66D46-740/LB
11 differences, the largest is module efficiency
Same manufacturer
JA Solar JAM66D42-580/MB vs JA Solar JAM66D46-735/LB
11 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM66D42-580/MB or JA Solar JAM66D42-605/MB?
According to our database: JA Solar JAM66D42-605/MB has higher module efficiency (23.40% 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 JAM66D42-580/MB and JA Solar JAM66D42-605/MB?
JA Solar JAM66D42-580/MB has a module efficiency of 22.50%, while JA Solar JAM66D42-605/MB is 23.40%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM66D42-580/MB use vs JA Solar JAM66D42-605/MB?
JA Solar JAM66D42-580/MB uses TOPCon cells; JA Solar JAM66D42-605/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 JAM66D42-580/MB and JA Solar JAM66D42-605/MB?
JA Solar JAM66D42-580/MB has a 30 years power warranty; JA Solar JAM66D42-605/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 JAM66D42-580/MB and JA Solar JAM66D42-605/MB bifacial panels?
Both JA Solar JAM66D42-580/MB and JA Solar JAM66D42-605/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.