JA Solar JAM66D46-725/LB vs JA Solar JAM54D40-460/LR
VS
The verdict
15 differences, and they point both ways
The largest is rated power: 265 W more power. 4 of 19 comparable parameters are identical.
See all 15 differencesHow alike are they
4
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
15 of 19 parameters
What actually differs
Parameter
JAM66D46-725/LB
JAM54D40-460/LR
Difference
Rated power
725 Wp
460 Wp
265 W more power
Weight
38.2 kg
22.0 kg
16.2 kg lighter
Product warranty
12 yrs
15 yrs
3 yrs longer
Open-circuit voltage
49.20 V
39.70 V
9.50 V apart
Short-circuit current
18.63 A
14.64 A
3.99 A apart
Module area
3.106 m²
1.998 m²
1.108 m² apart
Module efficiency
23.30 %
23.00 %
0.30 pp more efficient
Weight per kWp
52.7 kg/kWp
47.8 kg/kWp
4.9 kg/kWp lighter
Cell technology
TOPCon
N-type
TOPCon vs N-type
Power density
233.4 Wp/m²
230.2 Wp/m²
3.2 Wp/m² higher
Voltage at max power
41.39 V
33.17 V
8.22 V apart
Current at max power
17.52 A
13.87 A
3.65 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.
JAM66D46-725/LB
24,325 kWh
JAM54D40-460/LR
15,434 kWh
Lifetime gap
8,891 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
JAM66D46-725/LB
JAM54D40-460/LR
Standard test conditions
25 °C
100.0% of rated power
725 W
460 W
Cool, bright day
40 °C
95.7% of rated power
693 W
440 W
Typical summer roof
55 °C
91.3% of rated power
662 W
420 W
Hot roof
70 °C
87.0% of rated power
630 W
400 W
03
Full specification
Parameter
JAM66D46-725/LB
JAM54D40-460/LR
Difference
Power and efficiency
Rated power
725 Wp
460 Wp
+265 W for JAM66D46-725/LB
Module efficiency
23.30 %
23.00 %
+0.30 pp for JAM66D46-725/LB
Power density
233.4 Wp/m²
230.2 Wp/m²
+3.2 Wp/m² for JAM66D46-725/LB
Open-circuit voltage
49.20 V
39.70 V
9.50 V apart
Voltage at max power
41.39 V
33.17 V
8.22 V apart
Short-circuit current
18.63 A
14.64 A
3.99 A apart
Current at max power
17.52 A
13.87 A
3.65 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 JAM54D40-460/LR
Weight per kWp
52.7 kg/kWp
47.8 kg/kWp
-4.9 kg/kWp for JAM54D40-460/LR
Warranty and degradation
Product warranty
12 yrs
15 yrs
+3 yrs for JAM54D40-460/LR
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
132
108
24 cells apart
Bifacial
Yes
No
Yes vs No
04
14,005 panels
Against the whole database
Efficiency
#1,017
vs
#1,919
JAM66D46-725/LB leads by 902 places
Power density
#936
vs
#1,876
JAM66D46-725/LB leads by 940 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#6,337
vs
#1,924
JAM54D40-460/LR leads by 4,413 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#424
vs
#7,344
JAM66D46-725/LB leads by 6,920 places
05
Open the full database
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06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: JA Solar JAM66D46-725/LB or JA Solar JAM54D40-460/LR?
According to our database: JA Solar JAM66D46-725/LB has higher module efficiency (23.30% vs 23.00%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM66D46-725/LB and JA Solar JAM54D40-460/LR?
JA Solar JAM66D46-725/LB has a module efficiency of 23.30%, while JA Solar JAM54D40-460/LR is 23.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM66D46-725/LB use vs JA Solar JAM54D40-460/LR?
JA Solar JAM66D46-725/LB uses TOPCon cells; JA Solar JAM54D40-460/LR 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 JAM66D46-725/LB and JA Solar JAM54D40-460/LR?
JA Solar JAM66D46-725/LB has a 30 years power warranty; JA Solar JAM54D40-460/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 JAM66D46-725/LB and JA Solar JAM54D40-460/LR bifacial panels?
JA Solar JAM66D46-725/LB is bifacial (captures light from both faces); JA Solar JAM54D40-460/LR is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Shop prices: See 381 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.