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JAM78D30-580/MB/1500V vs JAM72S30-540/MR/1500V 7 of 19 identical Swap Change panels

JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM72S30-540/MR/1500V

JAM78D30-580/MB/1500V
580 Wp 20.70 % PERC Bifacial
Open panel page Datasheet PDF
VS
JAM72S30-540/MR/1500V
540 Wp 20.90 % PERC
Open panel page Datasheet PDF
The verdict

12 differences, and they point both ways

The largest is rated power: 40 W more power. 7 of 19 comparable parameters are identical.

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

What actually differs

12 of 19 parameters
Parameter JAM78D30-580/MB/1500V JAM72S30-540/MR/1500V Difference
Rated power 580 Wp 540 Wp 40 W more power
Performance warranty 30 yrs 25 yrs 5 yrs longer
Weight 33.4 kg 27.3 kg 6.1 kg lighter
Weight per kWp 57.6 kg/kWp 50.6 kg/kWp 7.0 kg/kWp lighter
Annual degradation 0.45 %/yr 0.55 %/yr 0.10 %/yr slower
Module area 2.795 m² 2.583 m² 0.212 m² apart
Open-circuit voltage 53.11 V 49.60 V 3.51 V apart
Module efficiency 20.70 % 20.90 % 0.20 pp more efficient
Cell count 156 144 12 cells apart
Bifacial Yes No Yes vs No
Voltage at max power 44.35 V 41.64 V 2.71 V apart
Dimensions 2465x1134x35 mm 2278x1134x30 mm 2465x1134x35 mm vs 2278x1134x30 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.
JAM78D30-580/MB/1500V
19,100 kWh
JAM72S30-540/MR/1500V
17,501 kWh
Lifetime gap
1,599 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM78D30-580/MB/1500V JAM72S30-540/MR/1500V
Standard test conditions 25 °C 100.0% of rated power 580 W 540 W
Cool, bright day 40 °C 94.8% of rated power 550 W 512 W
Typical summer roof 55 °C 89.5% of rated power 519 W 483 W
Hot roof 70 °C 84.2% of rated power 489 W 455 W
03

Full specification

Parameter JAM78D30-580/MB/1500V JAM72S30-540/MR/1500V Difference
Power and efficiency
Rated power 580 Wp 540 Wp +40 W for JAM78D30-580/MB/1500V
Module efficiency 20.70 % 20.90 % +0.20 pp for JAM72S30-540/MR/1500V
Power density 207.5 Wp/m² 209.0 Wp/m² Effectively the same
Open-circuit voltage 53.11 V 49.60 V 3.51 V apart
Voltage at max power 44.35 V 41.64 V 2.71 V apart
Short-circuit current 13.84 A 13.86 A Effectively the same
Current at max power 13.08 A 12.97 A Effectively the same
Temperature
Temperature coefficient -0.350 %/°C -0.350 %/°C Same
Mechanical
Dimensions 2465x1134x35 mm 2278x1134x30 mm 2465x1134x35 mm vs 2278x1134x30 mm
Module area 2.795 m² 2.583 m² 0.212 m² apart
Weight 33.4 kg 27.3 kg -6.1 kg for JAM72S30-540/MR/1500V
Weight per kWp 57.6 kg/kWp 50.6 kg/kWp -7.0 kg/kWp for JAM72S30-540/MR/1500V
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 25 yrs +5 yrs for JAM78D30-580/MB/1500V
Annual degradation 0.45 %/yr 0.55 %/yr -0.10 %/yr for JAM78D30-580/MB/1500V
Technology
Cell technology PERC PERC Same
Cell type Monocrystalline Monocrystalline Same
Cell count 156 144 12 cells apart
Bifacial Yes No Yes vs No
04

Against the whole database

14,129 panels
Efficiency
#10,842 vs #10,148
JAM72S30-540/MR/1500V leads by 694 places
Power density
#10,672 vs #10,176
JAM72S30-540/MR/1500V leads by 496 places
Heat behaviour
#10,489 vs #10,489
Tied - the same position in the database
Weight
#11,388 vs #3,965
JAM72S30-540/MR/1500V leads by 7,423 places
Warranty
#21 vs #9,912
JAM78D30-580/MB/1500V leads by 9,891 places
Overall
#6,690 vs #8,957
JAM78D30-580/MB/1500V leads by 2,267 places
05

More useful comparisons

Open the full database
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JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM78D30-605/MB/1500V
5 differences, the largest is module efficiency
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JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM78D30-600/MB/1500V
3 differences, the largest is module efficiency
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JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM78D30-595/MB/1500V
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JA Solar JAM78D30-580/MB/1500V vs JA Solar JAM78D30-590/MB/1500V
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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 JAM72D30-580/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 JAM72S30-540/MR/1500V?
According to our database: JA Solar JAM72S30-540/MR/1500V has higher module efficiency (20.90% 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 JAM72S30-540/MR/1500V?
JA Solar JAM78D30-580/MB/1500V has a module efficiency of 20.70%, while JA Solar JAM72S30-540/MR/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 JAM78D30-580/MB/1500V use vs JA Solar JAM72S30-540/MR/1500V?
JA Solar JAM78D30-580/MB/1500V uses PERC cells; JA Solar JAM72S30-540/MR/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 JAM72S30-540/MR/1500V?
JA Solar JAM78D30-580/MB/1500V has a 30 years power warranty; JA Solar JAM72S30-540/MR/1500V has a 25 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 JAM72S30-540/MR/1500V bifacial panels?
JA Solar JAM78D30-580/MB/1500V is bifacial (captures light from both faces); JA Solar JAM72S30-540/MR/1500V is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

Shop prices: See 328 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.