JA Solar JAM72D42-635/LB vs JA Solar JAM66D46-735/LB
VS
The verdict
JAM66D46-735/LB leads on the differences that matter
The largest is module efficiency: 1.00 pp more efficient. 7 of 19 comparable parameters are identical.
See all 12 differencesHow alike are they
7
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
12 of 19 parameters
What actually differs
Parameter
JAM72D42-635/LB
JAM66D46-735/LB
Difference
Module efficiency
22.70 %
23.70 %
1.00 pp more efficient
Rated power
635 Wp
735 Wp
100 W more power
Power density
227.2 Wp/m²
236.6 Wp/m²
9.4 Wp/m² higher
Weight
34.6 kg
38.2 kg
3.6 kg lighter
Short-circuit current
15.26 A
18.70 A
3.44 A apart
Module area
2.795 m²
3.106 m²
0.311 m² apart
Open-circuit voltage
52.67 V
49.60 V
3.07 V apart
Current at max power
14.40 A
17.60 A
3.20 A apart
Cell count
144
132
12 cells apart
Weight per kWp
54.5 kg/kWp
52.0 kg/kWp
2.5 kg/kWp lighter
Voltage at max power
44.10 V
41.77 V
2.33 V apart
Dimensions
2465x1134x30 mm
2384x1303x33 mm
2465x1134x30 mm vs 2384x1303x33 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.
JAM72D42-635/LB
21,306 kWh
JAM66D46-735/LB
24,661 kWh
Lifetime gap
3,355 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
JAM72D42-635/LB
JAM66D46-735/LB
Standard test conditions
25 °C
100.0% of rated power
635 W
735 W
Cool, bright day
40 °C
95.7% of rated power
607 W
703 W
Typical summer roof
55 °C
91.3% of rated power
580 W
671 W
Hot roof
70 °C
87.0% of rated power
552 W
639 W
03
Full specification
Parameter
JAM72D42-635/LB
JAM66D46-735/LB
Difference
Power and efficiency
Rated power
635 Wp
735 Wp
+100 W for JAM66D46-735/LB
Module efficiency
22.70 %
23.70 %
+1.00 pp for JAM66D46-735/LB
Power density
227.2 Wp/m²
236.6 Wp/m²
+9.4 Wp/m² for JAM66D46-735/LB
Open-circuit voltage
52.67 V
49.60 V
3.07 V apart
Voltage at max power
44.10 V
41.77 V
2.33 V apart
Short-circuit current
15.26 A
18.70 A
3.44 A apart
Current at max power
14.40 A
17.60 A
3.20 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
2465x1134x30 mm
2384x1303x33 mm
2465x1134x30 mm vs 2384x1303x33 mm
Module area
2.795 m²
3.106 m²
0.311 m² apart
Weight
34.6 kg
38.2 kg
-3.6 kg for JAM72D42-635/LB
Weight per kWp
54.5 kg/kWp
52.0 kg/kWp
-2.5 kg/kWp for JAM66D46-735/LB
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
144
132
12 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#3,307
vs
#517
JAM66D46-735/LB leads by 2,790 places
Power density
#3,252
vs
#582
JAM66D46-735/LB leads by 2,670 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#8,832
vs
#5,413
JAM66D46-735/LB leads by 3,419 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#2,396
vs
#233
JAM66D46-735/LB leads by 2,163 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 JAM72D42-635/LB or JA Solar JAM66D46-735/LB?
According to our database: JA Solar JAM66D46-735/LB has higher module efficiency (23.70% vs 22.70%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM72D42-635/LB and JA Solar JAM66D46-735/LB?
JA Solar JAM72D42-635/LB has a module efficiency of 22.70%, while JA Solar JAM66D46-735/LB is 23.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM72D42-635/LB use vs JA Solar JAM66D46-735/LB?
JA Solar JAM72D42-635/LB uses TOPCon cells; JA Solar JAM66D46-735/LB 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 JAM72D42-635/LB and JA Solar JAM66D46-735/LB?
JA Solar JAM72D42-635/LB has a 30 years power warranty; JA Solar JAM66D46-735/LB 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 JAM72D42-635/LB and JA Solar JAM66D46-735/LB bifacial panels?
Both JA Solar JAM72D42-635/LB and JA Solar JAM66D46-735/LB 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 393 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.