JA Solar JAM66D46-740/LB vs JA Solar JAM54D41-455/LR
VS
The verdict
JAM66D46-740/LB leads on the differences that matter
The largest is module efficiency: 1.00 pp more efficient. 5 of 19 comparable parameters are identical.
See all 14 differencesHow alike are they
5
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
14 of 19 parameters
What actually differs
Parameter
JAM66D46-740/LB
JAM54D41-455/LR
Difference
Module efficiency
23.80 %
22.80 %
1.00 pp more efficient
Rated power
740 Wp
455 Wp
285 W more power
Power density
238.2 Wp/m²
227.7 Wp/m²
10.5 Wp/m² higher
Weight
38.2 kg
22.0 kg
16.2 kg lighter
Product warranty
12 yrs
15 yrs
3 yrs longer
Open-circuit voltage
49.80 V
40.50 V
9.30 V apart
Short-circuit current
18.73 A
14.42 A
4.31 A apart
Module area
3.106 m²
1.998 m²
1.108 m² apart
Weight per kWp
51.6 kg/kWp
48.4 kg/kWp
3.3 kg/kWp lighter
Voltage at max power
41.96 V
33.33 V
8.63 V apart
Current at max power
17.64 A
13.65 A
3.99 A apart
Cell count
132
108
24 cells apart
Bifacial
Yes
No
Yes vs No
Dimensions
2384x1303x33 mm
1762x1134x30 mm
2384x1303x33 mm vs 1762x1134x30 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.
JAM66D46-740/LB
24,828 kWh
JAM54D41-455/LR
15,266 kWh
Lifetime gap
9,562 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
JAM66D46-740/LB
JAM54D41-455/LR
Standard test conditions
25 °C
100.0% of rated power
740 W
455 W
Cool, bright day
40 °C
95.7% of rated power
708 W
435 W
Typical summer roof
55 °C
91.3% of rated power
676 W
415 W
Hot roof
70 °C
87.0% of rated power
643 W
396 W
03
Full specification
Parameter
JAM66D46-740/LB
JAM54D41-455/LR
Difference
Power and efficiency
Rated power
740 Wp
455 Wp
+285 W for JAM66D46-740/LB
Module efficiency
23.80 %
22.80 %
+1.00 pp for JAM66D46-740/LB
Power density
238.2 Wp/m²
227.7 Wp/m²
+10.5 Wp/m² for JAM66D46-740/LB
Open-circuit voltage
49.80 V
40.50 V
9.30 V apart
Voltage at max power
41.96 V
33.33 V
8.63 V apart
Short-circuit current
18.73 A
14.42 A
4.31 A apart
Current at max power
17.64 A
13.65 A
3.99 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
2384x1303x33 mm
1762x1134x30 mm
2384x1303x33 mm vs 1762x1134x30 mm
Module area
3.106 m²
1.998 m²
1.108 m² apart
Weight
38.2 kg
22.0 kg
-16.2 kg for JAM54D41-455/LR
Weight per kWp
51.6 kg/kWp
48.4 kg/kWp
-3.3 kg/kWp for JAM54D41-455/LR
Warranty and degradation
Product warranty
12 yrs
15 yrs
+3 yrs for JAM54D41-455/LR
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
108
24 cells apart
Bifacial
Yes
No
Yes vs No
04
14,005 panels
Against the whole database
Efficiency
#433
vs
#2,714
JAM66D46-740/LB leads by 2,281 places
Power density
#431
vs
#2,888
JAM66D46-740/LB leads by 2,457 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#4,997
vs
#2,220
JAM54D41-455/LR leads by 2,777 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#185
vs
#7,813
JAM66D46-740/LB leads by 7,628 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 JAM66D46-740/LB or JA Solar JAM54D41-455/LR?
According to our database: JA Solar JAM66D46-740/LB has higher module efficiency (23.80% vs 22.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM66D46-740/LB and JA Solar JAM54D41-455/LR?
JA Solar JAM66D46-740/LB has a module efficiency of 23.80%, while JA Solar JAM54D41-455/LR is 22.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM66D46-740/LB use vs JA Solar JAM54D41-455/LR?
JA Solar JAM66D46-740/LB uses TOPCon cells; JA Solar JAM54D41-455/LR 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 JAM66D46-740/LB and JA Solar JAM54D41-455/LR?
JA Solar JAM66D46-740/LB has a 30 years power warranty; JA Solar JAM54D41-455/LR 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 JAM66D46-740/LB and JA Solar JAM54D41-455/LR bifacial panels?
JA Solar JAM66D46-740/LB is bifacial (captures light from both faces); JA Solar JAM54D41-455/LR is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Shop prices: See 341 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.