JA Solar JAM54S40-455/LR vs JA Solar JAM54D40-465/LR
VS
The verdict
JAM54D40-465/LR leads on the differences that matter
The largest is module efficiency: 0.50 pp more efficient. 13 of 19 comparable parameters are identical.
See all 6 differencesHow alike are they
13
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
6 of 19 parameters
What actually differs
Parameter
JAM54S40-455/LR
JAM54D40-465/LR
Difference
Module efficiency
22.80 %
23.30 %
0.50 pp more efficient
Power density
227.7 Wp/m²
232.7 Wp/m²
5.0 Wp/m² higher
Weight
20.0 kg
22.0 kg
2.0 kg lighter
Weight per kWp
44.0 kg/kWp
47.3 kg/kWp
3.4 kg/kWp lighter
Cell technology
TOPCon
N-type
TOPCon vs N-type
Rated power
455 Wp
465 Wp
10 W more power
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.
JAM54S40-455/LR
15,266 kWh
JAM54D40-465/LR
15,602 kWh
Lifetime gap
336 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
JAM54S40-455/LR
JAM54D40-465/LR
Standard test conditions
25 °C
100.0% of rated power
455 W
465 W
Cool, bright day
40 °C
95.7% of rated power
435 W
445 W
Typical summer roof
55 °C
91.3% of rated power
415 W
425 W
Hot roof
70 °C
87.0% of rated power
396 W
404 W
03
Full specification
Parameter
JAM54S40-455/LR
JAM54D40-465/LR
Difference
Power and efficiency
Rated power
455 Wp
465 Wp
+10 W for JAM54D40-465/LR
Module efficiency
22.80 %
23.30 %
+0.50 pp for JAM54D40-465/LR
Power density
227.7 Wp/m²
232.7 Wp/m²
+5.0 Wp/m² for JAM54D40-465/LR
Open-circuit voltage
39.50 V
40.20 V
Effectively the same
Voltage at max power
33.00 V
33.50 V
Effectively the same
Short-circuit current
14.56 A
14.65 A
Effectively the same
Current at max power
13.79 A
13.88 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
20.0 kg
22.0 kg
-2.0 kg for JAM54S40-455/LR
Weight per kWp
44.0 kg/kWp
47.3 kg/kWp
-3.4 kg/kWp for JAM54S40-455/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
TOPCon
N-type
TOPCon vs N-type
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
108
108
Same
Bifacial
No
No
Same
04
14,005 panels
Against the whole database
Efficiency
#2,714
vs
#1,017
JAM54D40-465/LR leads by 1,697 places
Power density
#2,888
vs
#1,115
JAM54D40-465/LR leads by 1,773 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#365
vs
#1,632
JAM54S40-455/LR leads by 1,267 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#7,691
vs
#6,780
JAM54D40-465/LR leads by 911 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 JAM54S40-455/LR or JA Solar JAM54D40-465/LR?
According to our database: JA Solar JAM54D40-465/LR has higher module efficiency (23.30% 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 JAM54S40-455/LR and JA Solar JAM54D40-465/LR?
JA Solar JAM54S40-455/LR has a module efficiency of 22.80%, while JA Solar JAM54D40-465/LR is 23.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM54S40-455/LR use vs JA Solar JAM54D40-465/LR?
JA Solar JAM54S40-455/LR uses TOPCon cells; JA Solar JAM54D40-465/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 JAM54S40-455/LR and JA Solar JAM54D40-465/LR?
JA Solar JAM54S40-455/LR has a 30 years power warranty; JA Solar JAM54D40-465/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.