JA Solar JAM54D40-475/LR vs JA Solar JAM66D46-725/LB
VS
The verdict
JAM54D40-475/LR leads on the differences that matter
The largest is rated power: 250 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
JAM54D40-475/LR
JAM66D46-725/LB
Difference
Rated power
475 Wp
725 Wp
250 W more power
Module efficiency
23.80 %
23.30 %
0.50 pp more efficient
Weight
22.0 kg
38.2 kg
16.2 kg lighter
Weight per kWp
46.3 kg/kWp
52.7 kg/kWp
6.4 kg/kWp lighter
Product warranty
15 yrs
12 yrs
3 yrs longer
Open-circuit voltage
40.55 V
49.20 V
8.65 V apart
Short-circuit current
14.67 A
18.63 A
3.96 A apart
Module area
1.998 m²
3.106 m²
1.108 m² apart
Power density
237.7 Wp/m²
233.4 Wp/m²
4.3 Wp/m² higher
Cell technology
N-type
TOPCon
N-type vs TOPCon
Voltage at max power
34.18 V
41.39 V
7.21 V apart
Current at max power
13.90 A
17.52 A
3.62 A apart
Cell count
108
132
24 cells apart
Bifacial
No
Yes
No vs Yes
Dimensions
1762x1134x30 mm
2384x1303x33 mm
1762x1134x30 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.
JAM54D40-475/LR
15,937 kWh
JAM66D46-725/LB
24,325 kWh
Lifetime gap
8,388 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
JAM54D40-475/LR
JAM66D46-725/LB
Standard test conditions
25 °C
100.0% of rated power
475 W
725 W
Cool, bright day
40 °C
95.7% of rated power
454 W
693 W
Typical summer roof
55 °C
91.3% of rated power
434 W
662 W
Hot roof
70 °C
87.0% of rated power
413 W
630 W
03
Full specification
Parameter
JAM54D40-475/LR
JAM66D46-725/LB
Difference
Power and efficiency
Rated power
475 Wp
725 Wp
+250 W for JAM66D46-725/LB
Module efficiency
23.80 %
23.30 %
+0.50 pp for JAM54D40-475/LR
Power density
237.7 Wp/m²
233.4 Wp/m²
+4.3 Wp/m² for JAM54D40-475/LR
Open-circuit voltage
40.55 V
49.20 V
8.65 V apart
Voltage at max power
34.18 V
41.39 V
7.21 V apart
Short-circuit current
14.67 A
18.63 A
3.96 A apart
Current at max power
13.90 A
17.52 A
3.62 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
1762x1134x30 mm
2384x1303x33 mm
1762x1134x30 mm vs 2384x1303x33 mm
Module area
1.998 m²
3.106 m²
1.108 m² apart
Weight
22.0 kg
38.2 kg
-16.2 kg for JAM54D40-475/LR
Weight per kWp
46.3 kg/kWp
52.7 kg/kWp
-6.4 kg/kWp for JAM54D40-475/LR
Warranty and degradation
Product warranty
15 yrs
12 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
N-type
TOPCon
N-type vs TOPCon
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
108
132
24 cells apart
Bifacial
No
Yes
No vs Yes
04
14,129 panels
Against the whole database
Efficiency
#462
vs
#1,057
JAM54D40-475/LR leads by 595 places
Power density
#497
vs
#974
JAM54D40-475/LR leads by 477 places
Heat behaviour
#2,220
vs
#2,220
Tied - the same position in the database
Weight
#1,117
vs
#6,390
JAM54D40-475/LR leads by 5,273 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#5,846
vs
#431
JAM66D46-725/LB leads by 5,415 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 JAM54D40-475/LR or JA Solar JAM66D46-725/LB?
According to our database: JA Solar JAM54D40-475/LR has higher module efficiency (23.80% vs 23.30%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM54D40-475/LR and JA Solar JAM66D46-725/LB?
JA Solar JAM54D40-475/LR has a module efficiency of 23.80%, while JA Solar JAM66D46-725/LB is 23.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM54D40-475/LR use vs JA Solar JAM66D46-725/LB?
JA Solar JAM54D40-475/LR uses N-type cells; JA Solar JAM66D46-725/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 JAM54D40-475/LR and JA Solar JAM66D46-725/LB?
JA Solar JAM54D40-475/LR has a 30 years power warranty; JA Solar JAM66D46-725/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 JAM54D40-475/LR and JA Solar JAM66D46-725/LB bifacial panels?
JA Solar JAM66D46-725/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 316 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.