JA Solar JAT54S40-465/LR vs JA Solar JAM54S40-460/LR
VS
The verdict
JAT54S40-465/LR leads on the differences that matter
The largest is temperature coefficient: 0.030 %/°C better in heat. 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
JAT54S40-465/LR
JAM54S40-460/LR
Difference
Temperature coefficient
-0.260 %/°C
-0.290 %/°C
0.030 %/°C better in heat
Module efficiency
23.50 %
23.00 %
0.50 pp more efficient
Annual degradation
0.55 %/yr
0.40 %/yr
0.15 %/yr slower
Open-circuit voltage
40.88 V
39.70 V
1.18 V apart
Voltage at max power
34.61 V
33.17 V
1.44 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
JAT54S40-465/LR
15,238 kWh
JAM54S40-460/LR
15,434 kWh
Lifetime gap
196 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
JAT54S40-465/LR
JAM54S40-460/LR
Standard test conditions
25 °C
100.0% of rated power
465 W
460 W
Cool, bright day
40 °C
95.7% of rated power
447 W
440 W
Typical summer roof
55 °C
91.3% of rated power
429 W
420 W
Hot roof
70 °C
87.0% of rated power
411 W
400 W
03
Full specification
Parameter
JAT54S40-465/LR
JAM54S40-460/LR
Difference
Power and efficiency
Rated power
465 Wp
460 Wp
Effectively the same
Module efficiency
23.50 %
23.00 %
+0.50 pp for JAT54S40-465/LR
Power density
232.7 Wp/m²
230.2 Wp/m²
Effectively the same
Open-circuit voltage
40.88 V
39.70 V
1.18 V apart
Voltage at max power
34.61 V
33.17 V
1.44 V apart
Short-circuit current
14.78 A
14.64 A
Effectively the same
Current at max power
13.45 A
13.87 A
Effectively the same
Temperature
Temperature coefficient
-0.260 %/°C
-0.290 %/°C
+0.030 %/°C for JAT54S40-465/LR
Mechanical
Dimensions
1762x1134x30 mm
1762x1134x30 mm
Same
Module area
1.998 m²
1.998 m²
Same
Weight
19.3 kg
20.0 kg
Effectively the same
Weight per kWp
41.5 kg/kWp
43.5 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
15 yrs
15 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.55 %/yr
0.40 %/yr
-0.15 %/yr for JAM54S40-460/LR
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
108
108
Same
Bifacial
No
No
Same
04
14,005 panels
Against the whole database
Efficiency
#716
vs
#1,919
JAT54S40-465/LR leads by 1,203 places
Power density
#1,115
vs
#1,876
JAT54S40-465/LR leads by 761 places
Heat behaviour
#511
vs
#2,165
JAT54S40-465/LR leads by 1,654 places
Weight
#180
vs
#300
JAT54S40-465/LR leads by 120 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#6,379
vs
#7,250
JAT54S40-465/LR leads by 871 places
05
Open the full database
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The same specification on paper
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: JA Solar JAT54S40-465/LR or JA Solar JAM54S40-460/LR?
According to our database: JA Solar JAT54S40-465/LR has higher module efficiency (23.50% vs 23.00%); JA Solar JAT54S40-465/LR tolerates heat better (temp coeff -0.260%/°C vs -0.290%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAT54S40-465/LR and JA Solar JAM54S40-460/LR?
JA Solar JAT54S40-465/LR has a module efficiency of 23.50%, while JA Solar JAM54S40-460/LR is 23.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAT54S40-465/LR use vs JA Solar JAM54S40-460/LR?
JA Solar JAT54S40-465/LR uses TOPCon cells; JA Solar JAM54S40-460/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 JAT54S40-465/LR and JA Solar JAM54S40-460/LR?
JA Solar JAT54S40-465/LR has a 30 years power warranty; JA Solar JAM54S40-460/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 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.