JA Solar JAM54D41-440/LB vs JA Solar JAM54D40-465/LB
VS
The verdict
JAM54D40-465/LB leads on the differences that matter
The largest is module efficiency: 1.30 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
JAM54D41-440/LB
JAM54D40-465/LB
Difference
Module efficiency
22.00 %
23.30 %
1.30 pp more efficient
Power density
220.2 Wp/m²
232.7 Wp/m²
12.5 Wp/m² higher
Rated power
440 Wp
465 Wp
25 W more power
Weight per kWp
50.0 kg/kWp
47.3 kg/kWp
2.7 kg/kWp lighter
Short-circuit current
14.37 A
15.07 A
0.70 A apart
Voltage at max power
32.29 V
33.33 V
1.04 V apart
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.
JAM54D41-440/LB
14,763 kWh
JAM54D40-465/LB
15,602 kWh
Lifetime gap
839 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
JAM54D41-440/LB
JAM54D40-465/LB
Standard test conditions
25 °C
100.0% of rated power
440 W
465 W
Cool, bright day
40 °C
95.7% of rated power
421 W
445 W
Typical summer roof
55 °C
91.3% of rated power
402 W
425 W
Hot roof
70 °C
87.0% of rated power
383 W
404 W
03
Full specification
Parameter
JAM54D41-440/LB
JAM54D40-465/LB
Difference
Power and efficiency
Rated power
440 Wp
465 Wp
+25 W for JAM54D40-465/LB
Module efficiency
22.00 %
23.30 %
+1.30 pp for JAM54D40-465/LB
Power density
220.2 Wp/m²
232.7 Wp/m²
+12.5 Wp/m² for JAM54D40-465/LB
Open-circuit voltage
38.90 V
39.70 V
Effectively the same
Voltage at max power
32.29 V
33.33 V
1.04 V apart
Short-circuit current
14.37 A
15.07 A
0.70 A apart
Current at max power
13.63 A
13.95 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
50.0 kg/kWp
47.3 kg/kWp
-2.7 kg/kWp for JAM54D40-465/LB
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
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
108
108
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#6,517
vs
#1,017
JAM54D40-465/LB leads by 5,500 places
Power density
#6,328
vs
#1,115
JAM54D40-465/LB leads by 5,213 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#3,317
vs
#1,632
JAM54D40-465/LB leads by 1,685 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#9,307
vs
#6,780
JAM54D40-465/LB leads by 2,527 places
05
Open the full database
More useful comparisons
Same series, other bin
JA Solar JAM54D41-440/LB vs JA Solar JAM54D40-475/LB
7 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM54D41-440/LB vs JA Solar JAM54D40-470/LB
7 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM54D41-440/LB vs JA Solar JAM54D40-460/LB
5 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM54D41-440/LB vs JA Solar JAM54D40-455/LB
4 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM54D41-440/LB vs JA Solar JAM54D41-455/LB
4 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM54D41-440/LB vs JA Solar JAM54D41 455/LB
5 differences, the largest is module efficiency
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: JA Solar JAM54D41-440/LB or JA Solar JAM54D40-465/LB?
According to our database: JA Solar JAM54D40-465/LB has higher module efficiency (23.30% vs 22.00%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM54D41-440/LB and JA Solar JAM54D40-465/LB?
JA Solar JAM54D41-440/LB has a module efficiency of 22.00%, while JA Solar JAM54D40-465/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 JAM54D41-440/LB use vs JA Solar JAM54D40-465/LB?
JA Solar JAM54D41-440/LB uses TOPCon cells; JA Solar JAM54D40-465/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 JAM54D41-440/LB and JA Solar JAM54D40-465/LB?
JA Solar JAM54D41-440/LB has a 30 years power warranty; JA Solar JAM54D40-465/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 JAM54D41-440/LB and JA Solar JAM54D40-465/LB bifacial panels?
Both JA Solar JAM54D41-440/LB and JA Solar JAM54D40-465/LB are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.
Shop prices: See 393 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.