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JAM72D30-575/LB/1500V vs JAM78D30-585/MB/1500V 9 of 19 identical Swap Change panels

JA Solar JAM72D30-575/LB/1500V vs JA Solar JAM78D30-585/MB/1500V

JAM72D30-575/LB/1500V
575 Wp 21.70 % PERC Bifacial
Open panel page Datasheet PDF
VS
JAM78D30-585/MB/1500V
585 Wp 20.90 % PERC Bifacial
Open panel page Datasheet PDF
The verdict

JAM72D30-575/LB/1500V leads on the differences that matter

The largest is module efficiency: 0.80 pp more efficient. 9 of 19 comparable parameters are identical.

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

What actually differs

10 of 19 parameters
Parameter JAM72D30-575/LB/1500V JAM78D30-585/MB/1500V Difference
Module efficiency 21.70 % 20.90 % 0.80 pp more efficient
Power density 217.3 Wp/m² 209.3 Wp/m² 8.1 Wp/m² higher
Module area 2.646 m² 2.795 m² 0.150 m² apart
Open-circuit voltage 50.86 V 53.20 V 2.34 V apart
Rated power 575 Wp 585 Wp 10 W more power
Cell count 144 156 12 cells apart
Voltage at max power 42.05 V 44.56 V 2.51 V apart
Short-circuit current 14.44 A 13.88 A 0.56 A apart
Dimensions 2333x1134x30 mm 2465x1134x35 mm 2333x1134x30 mm vs 2465x1134x35 mm
Current at max power 13.67 A 13.13 A 0.54 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.
JAM72D30-575/LB/1500V
18,935 kWh
JAM78D30-585/MB/1500V
19,265 kWh
Lifetime gap
330 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM72D30-575/LB/1500V JAM78D30-585/MB/1500V
Standard test conditions 25 °C 100.0% of rated power 575 W 585 W
Cool, bright day 40 °C 94.8% of rated power 545 W 554 W
Typical summer roof 55 °C 89.5% of rated power 515 W 524 W
Hot roof 70 °C 84.2% of rated power 484 W 493 W
03

Full specification

Parameter JAM72D30-575/LB/1500V JAM78D30-585/MB/1500V Difference
Power and efficiency
Rated power 575 Wp 585 Wp +10 W for JAM78D30-585/MB/1500V
Module efficiency 21.70 % 20.90 % +0.80 pp for JAM72D30-575/LB/1500V
Power density 217.3 Wp/m² 209.3 Wp/m² +8.1 Wp/m² for JAM72D30-575/LB/1500V
Open-circuit voltage 50.86 V 53.20 V 2.34 V apart
Voltage at max power 42.05 V 44.56 V 2.51 V apart
Short-circuit current 14.44 A 13.88 A 0.56 A apart
Current at max power 13.67 A 13.13 A 0.54 A apart
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 56.5 kg/kWp 57.1 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
#7,485 vs #10,148
JAM72D30-575/LB/1500V leads by 2,663 places
Power density
#7,388 vs #10,074
JAM72D30-575/LB/1500V leads by 2,686 places
Heat behaviour
#10,489 vs #10,489
Tied - the same position in the database
Weight
#10,781 vs #11,132
JAM72D30-575/LB/1500V leads by 351 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#5,637 vs #6,198
JAM72D30-575/LB/1500V leads by 561 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM72D30-575/LB/1500V vs JA Solar JAM72D30-580/LB/1500V
One difference: module efficiency
Same series, other bin
JA Solar JAM72D30-575/LB/1500V vs JA Solar JAM72D30-570/LB/1500V
One difference: module efficiency
Same series, other bin
JA Solar JAM72D30-575/LB/1500V vs JA Solar JAM72D30-565/LB/1500V
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72D30-575/LB/1500V vs JA Solar JAM72D30-560/LB/1500V
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72D30-575/LB/1500V vs JA Solar JAM72D30-555/LB/1500V
4 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM78D30-585/MB/1500V vs JA Solar JAM78D30-605/MB/1500V
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM72D30-575/LB/1500V or JA Solar JAM78D30-585/MB/1500V?
According to our database: JA Solar JAM72D30-575/LB/1500V has higher module efficiency (21.70% vs 20.90%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM72D30-575/LB/1500V and JA Solar JAM78D30-585/MB/1500V?
JA Solar JAM72D30-575/LB/1500V has a module efficiency of 21.70%, while JA Solar JAM78D30-585/MB/1500V is 20.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM72D30-575/LB/1500V use vs JA Solar JAM78D30-585/MB/1500V?
JA Solar JAM72D30-575/LB/1500V uses PERC cells; JA Solar JAM78D30-585/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 JAM72D30-575/LB/1500V and JA Solar JAM78D30-585/MB/1500V?
JA Solar JAM72D30-575/LB/1500V has a 30 years power warranty; JA Solar JAM78D30-585/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 JAM72D30-575/LB/1500V and JA Solar JAM78D30-585/MB/1500V bifacial panels?
Both JA Solar JAM72D30-575/LB/1500V and JA Solar JAM78D30-585/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.