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JAM72D30-580/LB/1500V vs JAM78D30-605/MB/1500V 12 of 19 identical Swap Change panels

JA Solar JAM72D30-580/LB/1500V vs JA Solar JAM78D30-605/MB/1500V

JAM72D30-580/LB/1500V
580 Wp 21.90 % PERC Bifacial
Open panel page Datasheet PDF
VS
JAM78D30-605/MB/1500V
605 Wp 21.60 % PERC Bifacial
Open panel page Datasheet PDF
The verdict

7 differences, and they point both ways

The largest is rated power: 25 W more power. 12 of 19 comparable parameters are identical.

See all 7 differences
How alike are they
12 of 19 comparable
parameters are identical
identical differs
01

What actually differs

7 of 19 parameters
Parameter JAM72D30-580/LB/1500V JAM78D30-605/MB/1500V Difference
Rated power 580 Wp 605 Wp 25 W more power
Module area 2.646 m² 2.795 m² 0.150 m² apart
Module efficiency 21.90 % 21.60 % 0.30 pp more efficient
Open-circuit voltage 51.04 V 53.61 V 2.57 V apart
Cell count 144 156 12 cells apart
Voltage at max power 42.24 V 45.53 V 3.29 V apart
Dimensions 2333x1134x30 mm 2465x1134x35 mm 2333x1134x30 mm vs 2465x1134x35 mm
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.
JAM72D30-580/LB/1500V
19,100 kWh
JAM78D30-605/MB/1500V
19,923 kWh
Lifetime gap
823 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM72D30-580/LB/1500V JAM78D30-605/MB/1500V
Standard test conditions 25 °C 100.0% of rated power 580 W 605 W
Cool, bright day 40 °C 94.8% of rated power 550 W 573 W
Typical summer roof 55 °C 89.5% of rated power 519 W 541 W
Hot roof 70 °C 84.2% of rated power 489 W 510 W
03

Full specification

Parameter JAM72D30-580/LB/1500V JAM78D30-605/MB/1500V Difference
Power and efficiency
Rated power 580 Wp 605 Wp +25 W for JAM78D30-605/MB/1500V
Module efficiency 21.90 % 21.60 % +0.30 pp for JAM72D30-580/LB/1500V
Power density 219.2 Wp/m² 216.4 Wp/m² Effectively the same
Open-circuit voltage 51.04 V 53.61 V 2.57 V apart
Voltage at max power 42.24 V 45.53 V 3.29 V apart
Short-circuit current 14.50 A 14.08 A Effectively the same
Current at max power 13.73 A 13.29 A Effectively the same
Temperature
Temperature coefficient -0.350 %/°C -0.350 %/°C Same
Mechanical
Dimensions 2333x1134x30 mm 2465x1134x35 mm 2333x1134x30 mm vs 2465x1134x35 mm
Module area 2.646 m² 2.795 m² 0.150 m² apart
Weight 32.5 kg 33.4 kg Effectively the same
Weight per kWp 56.0 kg/kWp 55.2 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 144 156 12 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#6,847 vs #7,716
JAM72D30-580/LB/1500V leads by 869 places
Power density
#6,797 vs #7,665
JAM72D30-580/LB/1500V leads by 868 places
Heat behaviour
#10,489 vs #10,489
Tied - the same position in the database
Weight
#10,427 vs #9,735
JAM78D30-605/MB/1500V leads by 692 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#5,238 vs #4,714
JAM78D30-605/MB/1500V leads by 524 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM72D30-580/LB/1500V vs JA Solar JAM72D30-575/LB/1500V
One difference: module efficiency
Same series, other bin
JA Solar JAM72D30-580/LB/1500V vs JA Solar JAM72D30-570/LB/1500V
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72D30-580/LB/1500V vs JA Solar JAM72D30-565/LB/1500V
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72D30-580/LB/1500V vs JA Solar JAM72D30-560/LB/1500V
4 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72D30-580/LB/1500V vs JA Solar JAM72D30-555/LB/1500V
4 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM78D30-605/MB/1500V vs JA Solar JAM78D30-600/MB/1500V
The same specification on paper
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM72D30-580/LB/1500V or JA Solar JAM78D30-605/MB/1500V?
According to our database: JA Solar JAM72D30-580/LB/1500V has higher module efficiency (21.90% vs 21.60%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM72D30-580/LB/1500V and JA Solar JAM78D30-605/MB/1500V?
JA Solar JAM72D30-580/LB/1500V has a module efficiency of 21.90%, while JA Solar JAM78D30-605/MB/1500V is 21.60%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM72D30-580/LB/1500V use vs JA Solar JAM78D30-605/MB/1500V?
JA Solar JAM72D30-580/LB/1500V uses PERC cells; JA Solar JAM78D30-605/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 JAM72D30-580/LB/1500V and JA Solar JAM78D30-605/MB/1500V?
JA Solar JAM72D30-580/LB/1500V has a 30 years power warranty; JA Solar JAM78D30-605/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 JAM72D30-580/LB/1500V and JA Solar JAM78D30-605/MB/1500V bifacial panels?
Both JA Solar JAM72D30-580/LB/1500V and JA Solar JAM78D30-605/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 314 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.