JA Solar JAM66D45-610/LB vs JA Solar JAM72D40-600/MB
VS
The verdict
JAM72D40-600/MB leads on the differences that matter
The largest is module efficiency: 0.60 pp more efficient. 8 of 19 comparable parameters are identical.
See all 11 differencesHow alike are they
8
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
11 of 19 parameters
What actually differs
Parameter
JAM66D45-610/LB
JAM72D40-600/MB
Difference
Module efficiency
22.60 %
23.20 %
0.60 pp more efficient
Power density
225.8 Wp/m²
232.3 Wp/m²
6.4 Wp/m² higher
Open-circuit voltage
48.10 V
52.79 V
4.69 V apart
Short-circuit current
16.05 A
14.04 A
2.01 A apart
Module area
2.701 m²
2.583 m²
0.118 m² apart
Rated power
610 Wp
600 Wp
10 W more power
Voltage at max power
39.77 V
44.85 V
5.08 V apart
Cell count
132
144
12 cells apart
Current at max power
15.34 A
13.38 A
1.96 A apart
Weight
33.1 kg
31.8 kg
1.3 kg lighter
Dimensions
2382x1134x30 mm
2278x1134x30 mm
2382x1134x30 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 (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
JAM66D45-610/LB
20,467 kWh
JAM72D40-600/MB
20,131 kWh
Lifetime gap
336 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
JAM66D45-610/LB
JAM72D40-600/MB
Standard test conditions
25 °C
100.0% of rated power
610 W
600 W
Cool, bright day
40 °C
95.7% of rated power
583 W
574 W
Typical summer roof
55 °C
91.3% of rated power
557 W
548 W
Hot roof
70 °C
87.0% of rated power
530 W
522 W
03
Full specification
Parameter
JAM66D45-610/LB
JAM72D40-600/MB
Difference
Power and efficiency
Rated power
610 Wp
600 Wp
+10 W for JAM66D45-610/LB
Module efficiency
22.60 %
23.20 %
+0.60 pp for JAM72D40-600/MB
Power density
225.8 Wp/m²
232.3 Wp/m²
+6.4 Wp/m² for JAM72D40-600/MB
Open-circuit voltage
48.10 V
52.79 V
4.69 V apart
Voltage at max power
39.77 V
44.85 V
5.08 V apart
Short-circuit current
16.05 A
14.04 A
2.01 A apart
Current at max power
15.34 A
13.38 A
1.96 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
2382x1134x30 mm
2278x1134x30 mm
2382x1134x30 mm vs 2278x1134x30 mm
Module area
2.701 m²
2.583 m²
0.118 m² apart
Weight
33.1 kg
31.8 kg
-1.3 kg for JAM72D40-600/MB
Weight per kWp
54.3 kg/kWp
53.0 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.40 %/yr
0.40 %/yr
Same
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
144
12 cells apart
Bifacial
Yes
Yes
Same
04
14,269 panels
Against the whole database
Efficiency
#3,785
vs
#1,390
JAM72D40-600/MB leads by 2,395 places
Power density
#3,857
vs
#1,336
JAM72D40-600/MB leads by 2,521 places
Heat behaviour
#2,260
vs
#2,260
Tied - the same position in the database
Weight
#8,656
vs
#6,832
JAM72D40-600/MB leads by 1,824 places
Warranty
#31
vs
#31
Tied - the same position in the database
Overall
#3,380
vs
#3,054
JAM72D40-600/MB leads by 326 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 JAM66D45-610/LB or JA Solar JAM72D40-600/MB?
According to our database: JA Solar JAM72D40-600/MB has higher module efficiency (23.20% vs 22.60%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM66D45-610/LB and JA Solar JAM72D40-600/MB?
JA Solar JAM66D45-610/LB has a module efficiency of 22.60%, 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 JAM66D45-610/LB use vs JA Solar JAM72D40-600/MB?
JA Solar JAM66D45-610/LB uses TOPCon 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 JAM66D45-610/LB and JA Solar JAM72D40-600/MB?
JA Solar JAM66D45-610/LB 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 JAM66D45-610/LB and JA Solar JAM72D40-600/MB bifacial panels?
Both JA Solar JAM66D45-610/LB 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 300 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.