JA Solar JAM66D46-735/LB vs JA Solar JAM54D40-475/LR
VS
The verdict
JAM54D40-475/LR leads on the differences that matter
The largest is rated power: 260 W more power. 6 of 19 comparable parameters are identical.
See all 13 differencesHow alike are they
6
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
13 of 19 parameters
What actually differs
Parameter
JAM66D46-735/LB
JAM54D40-475/LR
Difference
Rated power
735 Wp
475 Wp
260 W more power
Weight
38.2 kg
22.0 kg
16.2 kg lighter
Product warranty
12 yrs
15 yrs
3 yrs longer
Weight per kWp
52.0 kg/kWp
46.3 kg/kWp
5.7 kg/kWp lighter
Open-circuit voltage
49.60 V
40.55 V
9.05 V apart
Short-circuit current
18.70 A
14.67 A
4.03 A apart
Module area
3.106 m²
1.998 m²
1.108 m² apart
Cell technology
TOPCon
N-type
TOPCon vs N-type
Voltage at max power
41.77 V
34.18 V
7.59 V apart
Current at max power
17.60 A
13.90 A
3.70 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.
JAM66D46-735/LB
24,661 kWh
JAM54D40-475/LR
15,937 kWh
Lifetime gap
8,724 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
JAM66D46-735/LB
JAM54D40-475/LR
Standard test conditions
25 °C
100.0% of rated power
735 W
475 W
Cool, bright day
40 °C
95.7% of rated power
703 W
454 W
Typical summer roof
55 °C
91.3% of rated power
671 W
434 W
Hot roof
70 °C
87.0% of rated power
639 W
413 W
03
Full specification
Parameter
JAM66D46-735/LB
JAM54D40-475/LR
Difference
Power and efficiency
Rated power
735 Wp
475 Wp
+260 W for JAM66D46-735/LB
Module efficiency
23.70 %
23.80 %
Effectively the same
Power density
236.6 Wp/m²
237.7 Wp/m²
Effectively the same
Open-circuit voltage
49.60 V
40.55 V
9.05 V apart
Voltage at max power
41.77 V
34.18 V
7.59 V apart
Short-circuit current
18.70 A
14.67 A
4.03 A apart
Current at max power
17.60 A
13.90 A
3.70 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 JAM54D40-475/LR
Weight per kWp
52.0 kg/kWp
46.3 kg/kWp
-5.7 kg/kWp for JAM54D40-475/LR
Warranty and degradation
Product warranty
12 yrs
15 yrs
+3 yrs for JAM54D40-475/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
#517
vs
#433
JAM54D40-475/LR leads by 84 places
Power density
#582
vs
#467
JAM54D40-475/LR leads by 115 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#5,413
vs
#1,117
JAM54D40-475/LR leads by 4,296 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#233
vs
#5,786
JAM66D46-735/LB leads by 5,553 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 JAM66D46-735/LB or JA Solar JAM54D40-475/LR?
According to our database: JA Solar JAM54D40-475/LR has higher module efficiency (23.80% vs 23.70%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM66D46-735/LB and JA Solar JAM54D40-475/LR?
JA Solar JAM66D46-735/LB has a module efficiency of 23.70%, while JA Solar JAM54D40-475/LR is 23.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM66D46-735/LB use vs JA Solar JAM54D40-475/LR?
JA Solar JAM66D46-735/LB uses TOPCon cells; JA Solar JAM54D40-475/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 JAM66D46-735/LB and JA Solar JAM54D40-475/LR?
JA Solar JAM66D46-735/LB has a 30 years power warranty; JA Solar JAM54D40-475/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 JAM66D46-735/LB and JA Solar JAM54D40-475/LR bifacial panels?
JA Solar JAM66D46-735/LB is bifacial (captures light from both faces); JA Solar JAM54D40-475/LR is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
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.