JA Solar JAM72D40-605/MB vs JA Solar JAM78D40-605/MB/1500V
VS
The verdict
JAM72D40-605/MB leads on the differences that matter
The largest is module efficiency: 1.80 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
JAM72D40-605/MB
JAM78D40-605/MB/1500V
Difference
Module efficiency
23.40 %
21.60 %
1.80 pp more efficient
Power density
234.2 Wp/m²
216.4 Wp/m²
17.8 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
Weight per kWp
52.6 kg/kWp
57.2 kg/kWp
4.6 kg/kWp lighter
Temperature coefficient
-0.290 %/°C
-0.300 %/°C
0.010 %/°C better in heat
Cell technology
TOPCon
N-type
TOPCon vs N-type
Cell count
144
156
12 cells apart
Open-circuit voltage
53.00 V
54.90 V
1.90 V apart
Dimensions
2278x1134x30 mm
2465x1134x35 mm
2278x1134x30 mm vs 2465x1134x35 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
JAM72D40-605/MB
20,299 kWh
JAM78D40-605/MB/1500V
20,299 kWh
Lifetime gap
No difference
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
JAM72D40-605/MB
JAM78D40-605/MB/1500V
Standard test conditions
25 °C
100.0% of rated power
605 W
605 W
Cool, bright day
40 °C
95.5% of rated power
579 W
578 W
Typical summer roof
55 °C
91.0% of rated power
552 W
551 W
Hot roof
70 °C
86.5% of rated power
526 W
523 W
03
Full specification
Parameter
JAM72D40-605/MB
JAM78D40-605/MB/1500V
Difference
Power and efficiency
Rated power
605 Wp
605 Wp
Same
Module efficiency
23.40 %
21.60 %
+1.80 pp for JAM72D40-605/MB
Power density
234.2 Wp/m²
216.4 Wp/m²
+17.8 Wp/m² for JAM72D40-605/MB
Open-circuit voltage
53.00 V
54.90 V
1.90 V apart
Voltage at max power
45.05 V
45.80 V
Effectively the same
Short-circuit current
14.09 A
14.09 A
Same
Current at max power
13.43 A
13.21 A
Effectively the same
Temperature
Temperature coefficient
-0.290 %/°C
-0.300 %/°C
+0.010 %/°C for JAM72D40-605/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 JAM72D40-605/MB
Weight per kWp
52.6 kg/kWp
57.2 kg/kWp
-4.6 kg/kWp for JAM72D40-605/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
14,005 panels
Against the whole database
Efficiency
#882
vs
#7,652
JAM72D40-605/MB leads by 6,770 places
Power density
#863
vs
#7,601
JAM72D40-605/MB leads by 6,738 places
Heat behaviour
#2,165
vs
#6,093
JAM72D40-605/MB leads by 3,928 places
Weight
#6,188
vs
#11,122
JAM72D40-605/MB leads by 4,934 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#2,560
vs
#4,679
JAM72D40-605/MB leads by 2,119 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: JA Solar JAM72D40-605/MB or JA Solar JAM78D40-605/MB/1500V?
According to our database: JA Solar JAM72D40-605/MB has higher module efficiency (23.40% vs 21.60%); JA Solar JAM72D40-605/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 JAM72D40-605/MB and JA Solar JAM78D40-605/MB/1500V?
JA Solar JAM72D40-605/MB has a module efficiency of 23.40%, while JA Solar JAM78D40-605/MB/1500V is 21.60%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM72D40-605/MB use vs JA Solar JAM78D40-605/MB/1500V?
JA Solar JAM72D40-605/MB uses TOPCon cells; JA Solar JAM78D40-605/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 JAM72D40-605/MB and JA Solar JAM78D40-605/MB/1500V?
JA Solar JAM72D40-605/MB has a 30 years power warranty; JA Solar JAM78D40-605/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 JAM72D40-605/MB and JA Solar JAM78D40-605/MB/1500V bifacial panels?
Both JA Solar JAM72D40-605/MB and JA Solar JAM78D40-605/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.