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JAM78D30-580/MB/1500V vs JAM72D30-580/LB/1500V 10 of 19 identical Swap Change panels

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

JAM78D30-580/MB/1500V
580 Wp 20.70 % PERC Bifacial
Open panel page Datasheet PDF
VS
JAM72D30-580/LB/1500V
580 Wp 21.90 % PERC Bifacial
Open panel page Datasheet PDF
The verdict

JAM72D30-580/LB/1500V leads on the differences that matter

The largest is module efficiency: 1.20 pp more efficient. 10 of 19 comparable parameters are identical.

See all 9 differences
How alike are they
10 of 19 comparable
parameters are identical
identical differs
01

What actually differs

9 of 19 parameters
Parameter JAM78D30-580/MB/1500V JAM72D30-580/LB/1500V Difference
Module efficiency 20.70 % 21.90 % 1.20 pp more efficient
Power density 207.5 Wp/m² 219.2 Wp/m² 11.7 Wp/m² higher
Module area 2.795 m² 2.646 m² 0.150 m² apart
Open-circuit voltage 53.11 V 51.04 V 2.07 V apart
Cell count 156 144 12 cells apart
Short-circuit current 13.84 A 14.50 A 0.66 A apart
Voltage at max power 44.35 V 42.24 V 2.11 V apart
Dimensions 2465x1134x35 mm 2333x1134x30 mm 2465x1134x35 mm vs 2333x1134x30 mm
Current at max power 13.08 A 13.73 A 0.65 A 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 (-0.350 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
JAM78D30-580/MB/1500V
19,100 kWh
JAM72D30-580/LB/1500V
19,100 kWh
Lifetime gap
No difference
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM78D30-580/MB/1500V JAM72D30-580/LB/1500V
Standard test conditions 25 °C 100.0% of rated power 580 W 580 W
Cool, bright day 40 °C 94.8% of rated power 550 W 550 W
Typical summer roof 55 °C 89.5% of rated power 519 W 519 W
Hot roof 70 °C 84.2% of rated power 489 W 489 W
03

Full specification

Parameter JAM78D30-580/MB/1500V JAM72D30-580/LB/1500V Difference
Power and efficiency
Rated power 580 Wp 580 Wp Same
Module efficiency 20.70 % 21.90 % +1.20 pp for JAM72D30-580/LB/1500V
Power density 207.5 Wp/m² 219.2 Wp/m² +11.7 Wp/m² for JAM72D30-580/LB/1500V
Open-circuit voltage 53.11 V 51.04 V 2.07 V apart
Voltage at max power 44.35 V 42.24 V 2.11 V apart
Short-circuit current 13.84 A 14.50 A 0.66 A apart
Current at max power 13.08 A 13.73 A 0.65 A apart
Temperature
Temperature coefficient -0.350 %/°C -0.350 %/°C Same
Mechanical
Dimensions 2465x1134x35 mm 2333x1134x30 mm 2465x1134x35 mm vs 2333x1134x30 mm
Module area 2.795 m² 2.646 m² 0.150 m² apart
Weight 33.4 kg 32.5 kg Effectively the same
Weight per kWp 57.6 kg/kWp 56.0 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 156 144 12 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#10,842 vs #6,847
JAM72D30-580/LB/1500V leads by 3,995 places
Power density
#10,672 vs #6,797
JAM72D30-580/LB/1500V leads by 3,875 places
Heat behaviour
#10,489 vs #10,489
Tied - the same position in the database
Weight
#11,388 vs #10,427
JAM72D30-580/LB/1500V leads by 961 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#6,690 vs #5,238
JAM72D30-580/LB/1500V leads by 1,452 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM78D30-605/MB/1500V
5 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM78D30-600/MB/1500V
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM78D30-595/MB/1500V
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM78D30-590/MB/1500V
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM78D30-585/MB/1500V
One difference: module efficiency
Same series, other bin
JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM72D30-575/LB/1500V
9 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM78D30-580/MB/1500V or JA Solar JAM72D30-580/LB/1500V?
According to our database: JA Solar JAM72D30-580/LB/1500V has higher module efficiency (21.90% vs 20.70%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM78D30-580/MB/1500V and JA Solar JAM72D30-580/LB/1500V?
JA Solar JAM78D30-580/MB/1500V has a module efficiency of 20.70%, while JA Solar JAM72D30-580/LB/1500V is 21.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM78D30-580/MB/1500V use vs JA Solar JAM72D30-580/LB/1500V?
JA Solar JAM78D30-580/MB/1500V uses PERC cells; JA Solar JAM72D30-580/LB/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 JAM78D30-580/MB/1500V and JA Solar JAM72D30-580/LB/1500V?
JA Solar JAM78D30-580/MB/1500V has a 30 years power warranty; JA Solar JAM72D30-580/LB/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 JAM78D30-580/MB/1500V and JA Solar JAM72D30-580/LB/1500V bifacial panels?
Both JA Solar JAM78D30-580/MB/1500V and JA Solar JAM72D30-580/LB/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 330 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.