JA Solar JAM78D40-600/MB/1500V vs JA Solar JAM72D40-600/MB
VS
The verdict
JAM72D40-600/MB leads on the differences that matter
The largest is module efficiency: 1.70 pp more efficient. 9 of 19 comparable parameters are identical.
See all 10 differencesHow alike are they
9
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
10 of 19 parameters
What actually differs
Parameter
JAM78D40-600/MB/1500V
JAM72D40-600/MB
Difference
Module efficiency
21.50 %
23.20 %
1.70 pp more efficient
Power density
214.6 Wp/m²
232.3 Wp/m²
17.6 Wp/m² higher
Weight
34.6 kg
31.8 kg
2.8 kg lighter
Module area
2.795 m²
2.583 m²
0.212 m² apart
Weight per kWp
57.7 kg/kWp
53.0 kg/kWp
4.7 kg/kWp lighter
Temperature coefficient
-0.300 %/°C
-0.290 %/°C
0.010 %/°C better in heat
Cell technology
N-type
TOPCon
N-type vs TOPCon
Cell count
156
144
12 cells apart
Open-circuit voltage
54.75 V
52.79 V
1.96 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
JAM78D40-600/MB/1500V
20,131 kWh
JAM72D40-600/MB
20,131 kWh
Lifetime gap
No difference
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
JAM78D40-600/MB/1500V
JAM72D40-600/MB
Standard test conditions
25 °C
100.0% of rated power
600 W
600 W
Cool, bright day
40 °C
95.5% of rated power
573 W
574 W
Typical summer roof
55 °C
91.0% of rated power
546 W
548 W
Hot roof
70 °C
86.5% of rated power
519 W
522 W
03
Full specification
Parameter
JAM78D40-600/MB/1500V
JAM72D40-600/MB
Difference
Power and efficiency
Rated power
600 Wp
600 Wp
Same
Module efficiency
21.50 %
23.20 %
+1.70 pp for JAM72D40-600/MB
Power density
214.6 Wp/m²
232.3 Wp/m²
+17.6 Wp/m² for JAM72D40-600/MB
Open-circuit voltage
54.75 V
52.79 V
1.96 V apart
Voltage at max power
45.67 V
44.85 V
Effectively the same
Short-circuit current
14.02 A
14.04 A
Effectively the same
Current at max power
13.14 A
13.38 A
Effectively the same
Temperature
Temperature coefficient
-0.300 %/°C
-0.290 %/°C
+0.010 %/°C for JAM72D40-600/MB
Mechanical
Dimensions
2465x1134x35 mm
2278x1134x30 mm
2465x1134x35 mm vs 2278x1134x30 mm
Module area
2.795 m²
2.583 m²
0.212 m² apart
Weight
34.6 kg
31.8 kg
-2.8 kg for JAM72D40-600/MB
Weight per kWp
57.7 kg/kWp
53.0 kg/kWp
-4.7 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
N-type
TOPCon
N-type vs TOPCon
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
156
144
12 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#7,958
vs
#1,306
JAM72D40-600/MB leads by 6,652 places
Power density
#8,200
vs
#1,252
JAM72D40-600/MB leads by 6,948 places
Heat behaviour
#6,093
vs
#2,165
JAM72D40-600/MB leads by 3,928 places
Weight
#11,358
vs
#6,725
JAM72D40-600/MB leads by 4,633 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#4,969
vs
#2,960
JAM72D40-600/MB leads by 2,009 places
05
Open the full database
More useful comparisons
Same series, other bin
JA Solar JAM78D40-600/MB/1500V vs JA Solar JAM78D40-625/MB/1500V
4 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM78D40-600/MB/1500V vs JA Solar JAM78D40-620/MB/1500V
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM78D40-600/MB/1500V vs JA Solar JAM78D40-615/MB/1500V
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM78D40-600/MB/1500V vs JA Solar JAM78D40-610/MB/1500V
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM78D40-600/MB/1500V vs JA Solar JAM78D40-605/MB/1500V
The same specification on paper
Same series, other bin
JA Solar JAM72D40-600/MB vs JA Solar JAM72D40-605/MB
One difference: module efficiency
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: JA Solar JAM78D40-600/MB/1500V or JA Solar JAM72D40-600/MB?
According to our database: JA Solar JAM72D40-600/MB has higher module efficiency (23.20% vs 21.50%); 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 JAM78D40-600/MB/1500V and JA Solar JAM72D40-600/MB?
JA Solar JAM78D40-600/MB/1500V has a module efficiency of 21.50%, while JA Solar JAM72D40-600/MB is 23.20%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM78D40-600/MB/1500V use vs JA Solar JAM72D40-600/MB?
JA Solar JAM78D40-600/MB/1500V uses N-type cells; JA Solar JAM72D40-600/MB uses TOPCon. 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 JAM78D40-600/MB/1500V and JA Solar JAM72D40-600/MB?
JA Solar JAM78D40-600/MB/1500V has a 30 years power warranty; JA Solar JAM72D40-600/MB 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 JAM78D40-600/MB/1500V and JA Solar JAM72D40-600/MB bifacial panels?
Both JA Solar JAM78D40-600/MB/1500V and JA Solar JAM72D40-600/MB 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.