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JAM72D40-600/MB vs JAM78D40-615/MB/1500V 7 of 19 identical Swap Change panels

JA Solar JAM72D40-600/MB vs JA Solar JAM78D40-615/MB/1500V

JA Solar JAM72D40-600/MB
JAM72D40-600/MB
600 Wp 23.20 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
JAM78D40-615/MB/1500V
615 Wp 22.00 % N-type Bifacial
Open panel page Datasheet PDF
The verdict

JAM72D40-600/MB leads on the differences that matter

The largest is module efficiency: 1.20 pp more efficient. 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 JAM72D40-600/MB JAM78D40-615/MB/1500V Difference
Module efficiency 23.20 % 22.00 % 1.20 pp more efficient
Power density 232.3 Wp/m² 220.0 Wp/m² 12.3 Wp/m² higher
Weight 31.8 kg 34.6 kg 2.8 kg lighter
Module area 2.583 m² 2.795 m² 0.212 m² apart
Rated power 600 Wp 615 Wp 15 W more power
Temperature coefficient -0.290 %/°C -0.300 %/°C 0.010 %/°C better in heat
Cell technology TOPCon N-type TOPCon vs N-type
Weight per kWp 53.0 kg/kWp 56.3 kg/kWp 3.3 kg/kWp lighter
Open-circuit voltage 52.79 V 55.20 V 2.41 V apart
Cell count 144 156 12 cells apart
Dimensions 2278x1134x30 mm 2465x1134x35 mm 2278x1134x30 mm vs 2465x1134x35 mm
Voltage at max power 44.85 V 46.07 V 1.22 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
JAM72D40-600/MB
20,131 kWh
JAM78D40-615/MB/1500V
20,634 kWh
Lifetime gap
503 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM72D40-600/MB JAM78D40-615/MB/1500V
Standard test conditions 25 °C 100.0% of rated power 600 W 615 W
Cool, bright day 40 °C 95.5% of rated power 574 W 587 W
Typical summer roof 55 °C 91.0% of rated power 548 W 560 W
Hot roof 70 °C 86.5% of rated power 522 W 532 W
03

Full specification

Parameter JAM72D40-600/MB JAM78D40-615/MB/1500V Difference
Power and efficiency
Rated power 600 Wp 615 Wp +15 W for JAM78D40-615/MB/1500V
Module efficiency 23.20 % 22.00 % +1.20 pp for JAM72D40-600/MB
Power density 232.3 Wp/m² 220.0 Wp/m² +12.3 Wp/m² for JAM72D40-600/MB
Open-circuit voltage 52.79 V 55.20 V 2.41 V apart
Voltage at max power 44.85 V 46.07 V 1.22 V apart
Short-circuit current 14.04 A 14.23 A Effectively the same
Current at max power 13.38 A 13.35 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.300 %/°C +0.010 %/°C for JAM72D40-600/MB
Mechanical
Dimensions 2278x1134x30 mm 2465x1134x35 mm 2278x1134x30 mm vs 2465x1134x35 mm
Module area 2.583 m² 2.795 m² 0.212 m² apart
Weight 31.8 kg 34.6 kg -2.8 kg for JAM72D40-600/MB
Weight per kWp 53.0 kg/kWp 56.3 kg/kWp -3.3 kg/kWp for JAM72D40-600/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 N-type TOPCon vs N-type
Cell type Monocrystalline Monocrystalline Same
Cell count 144 156 12 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#1,306 vs #6,517
JAM72D40-600/MB leads by 5,211 places
Power density
#1,252 vs #6,655
JAM72D40-600/MB leads by 5,403 places
Heat behaviour
#2,165 vs #6,093
JAM72D40-600/MB leads by 3,928 places
Weight
#6,725 vs #10,534
JAM72D40-600/MB leads by 3,809 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,960 vs #3,865
JAM72D40-600/MB leads by 905 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM72D40-600/MB vs JA Solar JAM78D40-625/MB/1500V
12 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72D40-600/MB vs JA Solar JAM78D40-620/MB/1500V
12 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72D40-600/MB vs JA Solar JAM78D40-610/MB/1500V
12 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72D40-600/MB vs JA Solar JAM72D40-605/MB
One difference: module efficiency
Same series, other bin
JA Solar JAM72D40-600/MB vs JA Solar JAM78D40-605/MB/1500V
10 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72D40-600/MB vs JA Solar JAM78D40-600/MB/1500V
10 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM72D40-600/MB or JA Solar JAM78D40-615/MB/1500V?
According to our database: JA Solar JAM72D40-600/MB has higher module efficiency (23.20% vs 22.00%); JA Solar JAM72D40-600/MB tolerates heat better (temp coeff -0.290%/°C vs -0.300%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM72D40-600/MB and JA Solar JAM78D40-615/MB/1500V?
JA Solar JAM72D40-600/MB has a module efficiency of 23.20%, while JA Solar JAM78D40-615/MB/1500V is 22.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM72D40-600/MB use vs JA Solar JAM78D40-615/MB/1500V?
JA Solar JAM72D40-600/MB uses TOPCon cells; JA Solar JAM78D40-615/MB/1500V uses N-type. 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 JAM72D40-600/MB and JA Solar JAM78D40-615/MB/1500V?
JA Solar JAM72D40-600/MB has a 30 years power warranty; JA Solar JAM78D40-615/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 JAM72D40-600/MB and JA Solar JAM78D40-615/MB/1500V bifacial panels?
Both JA Solar JAM72D40-600/MB and JA Solar JAM78D40-615/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 391 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.