JA Solar JAM54D41-450/LR vs JA Solar JAM66D45-610/LB
VS
The verdict
JAM54D41-450/LR leads on the differences that matter
The largest is rated power: 160 W more power. 7 of 19 comparable parameters are identical.
See all 12 differencesHow alike are they
7
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
12 of 19 parameters
What actually differs
Parameter
JAM54D41-450/LR
JAM66D45-610/LB
Difference
Rated power
450 Wp
610 Wp
160 W more power
Weight
22.0 kg
33.1 kg
11.1 kg lighter
Product warranty
15 yrs
12 yrs
3 yrs longer
Weight per kWp
48.9 kg/kWp
54.3 kg/kWp
5.4 kg/kWp lighter
Open-circuit voltage
40.30 V
48.10 V
7.80 V apart
Module area
1.998 m²
2.701 m²
0.703 m² apart
Short-circuit current
14.41 A
16.05 A
1.64 A apart
Voltage at max power
32.99 V
39.77 V
6.78 V apart
Cell count
108
132
24 cells apart
Current at max power
13.64 A
15.34 A
1.70 A apart
Bifacial
No
Yes
No vs Yes
Dimensions
1762x1134x30 mm
2382x1134x30 mm
1762x1134x30 mm vs 2382x1134x30 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.
JAM54D41-450/LR
15,098 kWh
JAM66D45-610/LB
20,467 kWh
Lifetime gap
5,369 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
JAM54D41-450/LR
JAM66D45-610/LB
Standard test conditions
25 °C
100.0% of rated power
450 W
610 W
Cool, bright day
40 °C
95.7% of rated power
430 W
583 W
Typical summer roof
55 °C
91.3% of rated power
411 W
557 W
Hot roof
70 °C
87.0% of rated power
391 W
530 W
03
Full specification
Parameter
JAM54D41-450/LR
JAM66D45-610/LB
Difference
Power and efficiency
Rated power
450 Wp
610 Wp
+160 W for JAM66D45-610/LB
Module efficiency
22.50 %
22.60 %
Effectively the same
Power density
225.2 Wp/m²
225.8 Wp/m²
Effectively the same
Open-circuit voltage
40.30 V
48.10 V
7.80 V apart
Voltage at max power
32.99 V
39.77 V
6.78 V apart
Short-circuit current
14.41 A
16.05 A
1.64 A apart
Current at max power
13.64 A
15.34 A
1.70 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
1762x1134x30 mm
2382x1134x30 mm
1762x1134x30 mm vs 2382x1134x30 mm
Module area
1.998 m²
2.701 m²
0.703 m² apart
Weight
22.0 kg
33.1 kg
-11.1 kg for JAM54D41-450/LR
Weight per kWp
48.9 kg/kWp
54.3 kg/kWp
-5.4 kg/kWp for JAM54D41-450/LR
Warranty and degradation
Product warranty
15 yrs
12 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
108
132
24 cells apart
Bifacial
No
Yes
No vs Yes
04
14,129 panels
Against the whole database
Efficiency
#4,281
vs
#3,716
JAM66D45-610/LB leads by 565 places
Power density
#4,284
vs
#3,788
JAM66D45-610/LB leads by 496 places
Heat behaviour
#2,220
vs
#2,220
Tied - the same position in the database
Weight
#2,569
vs
#8,595
JAM54D41-450/LR leads by 6,026 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#8,461
vs
#3,331
JAM66D45-610/LB leads by 5,130 places
05
Open the full database
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3 differences, the largest is module efficiency
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: JA Solar JAM54D41-450/LR or JA Solar JAM66D45-610/LB?
According to our database: JA Solar JAM66D45-610/LB has higher module efficiency (22.60% 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 JAM54D41-450/LR and JA Solar JAM66D45-610/LB?
JA Solar JAM54D41-450/LR has a module efficiency of 22.50%, while JA Solar JAM66D45-610/LB is 22.60%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM54D41-450/LR use vs JA Solar JAM66D45-610/LB?
JA Solar JAM54D41-450/LR uses TOPCon cells; JA Solar JAM66D45-610/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 JAM54D41-450/LR and JA Solar JAM66D45-610/LB?
JA Solar JAM54D41-450/LR has a 30 years power warranty; JA Solar JAM66D45-610/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 JAM54D41-450/LR and JA Solar JAM66D45-610/LB bifacial panels?
JA Solar JAM66D45-610/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 330 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.