JA Solar JAM54D40-475/LR vs JA Solar JAM54D41-455/LR
VS
The verdict
JAM54D40-475/LR leads on the differences that matter
The largest is module efficiency: 1.00 pp more efficient. 14 of 19 comparable parameters are identical.
See all 5 differencesHow alike are they
14
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
5 of 19 parameters
What actually differs
Parameter
JAM54D40-475/LR
JAM54D41-455/LR
Difference
Module efficiency
23.80 %
22.80 %
1.00 pp more efficient
Power density
237.7 Wp/m²
227.7 Wp/m²
10.0 Wp/m² higher
Rated power
475 Wp
455 Wp
20 W more power
Cell technology
N-type
TOPCon
N-type vs TOPCon
Weight per kWp
46.3 kg/kWp
48.4 kg/kWp
2.0 kg/kWp lighter
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
JAM54D41-455/LR
15,266 kWh
Lifetime gap
671 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
JAM54D40-475/LR
JAM54D41-455/LR
Standard test conditions
25 °C
100.0% of rated power
475 W
455 W
Cool, bright day
40 °C
95.7% of rated power
454 W
435 W
Typical summer roof
55 °C
91.3% of rated power
434 W
415 W
Hot roof
70 °C
87.0% of rated power
413 W
396 W
03
Full specification
Parameter
JAM54D40-475/LR
JAM54D41-455/LR
Difference
Power and efficiency
Rated power
475 Wp
455 Wp
+20 W for JAM54D40-475/LR
Module efficiency
23.80 %
22.80 %
+1.00 pp for JAM54D40-475/LR
Power density
237.7 Wp/m²
227.7 Wp/m²
+10.0 Wp/m² for JAM54D40-475/LR
Open-circuit voltage
40.55 V
40.50 V
Effectively the same
Voltage at max power
34.18 V
33.33 V
Effectively the same
Short-circuit current
14.67 A
14.42 A
Effectively the same
Current at max power
13.90 A
13.65 A
Effectively the same
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
1762x1134x30 mm
1762x1134x30 mm
Same
Module area
1.998 m²
1.998 m²
Same
Weight
22.0 kg
22.0 kg
Same
Weight per kWp
46.3 kg/kWp
48.4 kg/kWp
-2.0 kg/kWp for JAM54D40-475/LR
Warranty and degradation
Product warranty
15 yrs
15 yrs
Same
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
108
Same
Bifacial
No
No
Same
04
14,005 panels
Against the whole database
Efficiency
#433
vs
#2,714
JAM54D40-475/LR leads by 2,281 places
Power density
#467
vs
#2,888
JAM54D40-475/LR leads by 2,421 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#1,117
vs
#2,220
JAM54D40-475/LR leads by 1,103 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#5,786
vs
#7,813
JAM54D40-475/LR leads by 2,027 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 JAM54D40-475/LR or JA Solar JAM54D41-455/LR?
According to our database: JA Solar JAM54D40-475/LR 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 JAM54D40-475/LR and JA Solar JAM54D41-455/LR?
JA Solar JAM54D40-475/LR 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 JAM54D40-475/LR use vs JA Solar JAM54D41-455/LR?
JA Solar JAM54D40-475/LR uses N-type 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 JAM54D40-475/LR and JA Solar JAM54D41-455/LR?
JA Solar JAM54D40-475/LR 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.
Shop prices: See 389 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.