JA Solar JAM66D45-625/LB vs JA Solar JAM54D41-450/LR
VS
The verdict
14 differences, and they point both ways
The largest is rated power: 175 W more power. 5 of 19 comparable parameters are identical.
See all 14 differencesHow alike are they
5
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
14 of 19 parameters
What actually differs
Parameter
JAM66D45-625/LB
JAM54D41-450/LR
Difference
Rated power
625 Wp
450 Wp
175 W more power
Module efficiency
23.10 %
22.50 %
0.60 pp more efficient
Weight
33.1 kg
22.0 kg
11.1 kg lighter
Product warranty
12 yrs
15 yrs
3 yrs longer
Power density
231.4 Wp/m²
225.2 Wp/m²
6.2 Wp/m² higher
Open-circuit voltage
48.70 V
40.30 V
8.40 V apart
Module area
2.701 m²
1.998 m²
0.703 m² apart
Short-circuit current
16.15 A
14.41 A
1.74 A apart
Weight per kWp
53.0 kg/kWp
48.9 kg/kWp
4.1 kg/kWp lighter
Voltage at max power
40.45 V
32.99 V
7.46 V apart
Cell count
132
108
24 cells apart
Current at max power
15.45 A
13.64 A
1.81 A apart
Bifacial
Yes
No
Yes vs No
Dimensions
2382x1134x30 mm
1762x1134x30 mm
2382x1134x30 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.
JAM66D45-625/LB
20,970 kWh
JAM54D41-450/LR
15,098 kWh
Lifetime gap
5,872 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
JAM66D45-625/LB
JAM54D41-450/LR
Standard test conditions
25 °C
100.0% of rated power
625 W
450 W
Cool, bright day
40 °C
95.7% of rated power
598 W
430 W
Typical summer roof
55 °C
91.3% of rated power
571 W
411 W
Hot roof
70 °C
87.0% of rated power
543 W
391 W
03
Full specification
Parameter
JAM66D45-625/LB
JAM54D41-450/LR
Difference
Power and efficiency
Rated power
625 Wp
450 Wp
+175 W for JAM66D45-625/LB
Module efficiency
23.10 %
22.50 %
+0.60 pp for JAM66D45-625/LB
Power density
231.4 Wp/m²
225.2 Wp/m²
+6.2 Wp/m² for JAM66D45-625/LB
Open-circuit voltage
48.70 V
40.30 V
8.40 V apart
Voltage at max power
40.45 V
32.99 V
7.46 V apart
Short-circuit current
16.15 A
14.41 A
1.74 A apart
Current at max power
15.45 A
13.64 A
1.81 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
2382x1134x30 mm
1762x1134x30 mm
2382x1134x30 mm vs 1762x1134x30 mm
Module area
2.701 m²
1.998 m²
0.703 m² apart
Weight
33.1 kg
22.0 kg
-11.1 kg for JAM54D41-450/LR
Weight per kWp
53.0 kg/kWp
48.9 kg/kWp
-4.1 kg/kWp for JAM54D41-450/LR
Warranty and degradation
Product warranty
12 yrs
15 yrs
+3 yrs for JAM54D41-450/LR
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
132
108
24 cells apart
Bifacial
Yes
No
Yes vs No
04
14,005 panels
Against the whole database
Efficiency
#1,570
vs
#4,222
JAM66D45-625/LB leads by 2,652 places
Power density
#1,513
vs
#4,225
JAM66D45-625/LB leads by 2,712 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#6,680
vs
#2,563
JAM54D41-450/LR leads by 4,117 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#2,270
vs
#8,397
JAM66D45-625/LB leads by 6,127 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 JAM66D45-625/LB or JA Solar JAM54D41-450/LR?
According to our database: JA Solar JAM66D45-625/LB has higher module efficiency (23.10% vs 22.50%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM66D45-625/LB and JA Solar JAM54D41-450/LR?
JA Solar JAM66D45-625/LB has a module efficiency of 23.10%, while JA Solar JAM54D41-450/LR is 22.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM66D45-625/LB use vs JA Solar JAM54D41-450/LR?
JA Solar JAM66D45-625/LB uses TOPCon cells; JA Solar JAM54D41-450/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 JAM66D45-625/LB and JA Solar JAM54D41-450/LR?
JA Solar JAM66D45-625/LB has a 30 years power warranty; JA Solar JAM54D41-450/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 JAM66D45-625/LB and JA Solar JAM54D41-450/LR bifacial panels?
JA Solar JAM66D45-625/LB is bifacial (captures light from both faces); JA Solar JAM54D41-450/LR is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Shop prices: See 394 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.