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JAT54S40-475/LR vs JAM54S40-455/LR 11 of 19 identical Swap Change panels

JA Solar JAT54S40-475/LR vs JA Solar JAM54S40-455/LR

JA Solar JAT54S40-475/LR
JAT54S40-475/LR
475 Wp 23.80 % TOPCon
Open panel page Datasheet PDF
VS
JA Solar JAM54S40-455/LR
JAM54S40-455/LR
455 Wp 22.80 % TOPCon
Open panel page Datasheet PDF
The verdict

JAT54S40-475/LR leads on the differences that matter

The largest is module efficiency: 1.00 pp more efficient. 11 of 19 comparable parameters are identical.

See all 8 differences
How alike are they
11 of 19 comparable
parameters are identical
identical differs
01

What actually differs

8 of 19 parameters
Parameter JAT54S40-475/LR JAM54S40-455/LR Difference
Module efficiency 23.80 % 22.80 % 1.00 pp more efficient
Temperature coefficient -0.260 %/°C -0.290 %/°C 0.030 %/°C better in heat
Power density 237.7 Wp/m² 227.7 Wp/m² 10.0 Wp/m² higher
Annual degradation 0.55 %/yr 0.40 %/yr 0.15 %/yr slower
Rated power 475 Wp 455 Wp 20 W more power
Weight per kWp 40.6 kg/kWp 44.0 kg/kWp 3.3 kg/kWp lighter
Open-circuit voltage 41.03 V 39.50 V 1.53 V apart
Voltage at max power 34.87 V 33.00 V 1.87 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
JAT54S40-475/LR
15,565 kWh
JAM54S40-455/LR
15,266 kWh
Lifetime gap
299 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAT54S40-475/LR JAM54S40-455/LR
Standard test conditions 25 °C 100.0% of rated power 475 W 455 W
Cool, bright day 40 °C 95.7% of rated power 456 W 435 W
Typical summer roof 55 °C 91.3% of rated power 438 W 415 W
Hot roof 70 °C 87.0% of rated power 419 W 396 W
03

Full specification

Parameter JAT54S40-475/LR JAM54S40-455/LR Difference
Power and efficiency
Rated power 475 Wp 455 Wp +20 W for JAT54S40-475/LR
Module efficiency 23.80 % 22.80 % +1.00 pp for JAT54S40-475/LR
Power density 237.7 Wp/m² 227.7 Wp/m² +10.0 Wp/m² for JAT54S40-475/LR
Open-circuit voltage 41.03 V 39.50 V 1.53 V apart
Voltage at max power 34.87 V 33.00 V 1.87 V apart
Short-circuit current 14.90 A 14.56 A Effectively the same
Current at max power 13.63 A 13.79 A Effectively the same
Temperature
Temperature coefficient -0.260 %/°C -0.290 %/°C +0.030 %/°C for JAT54S40-475/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 40.6 kg/kWp 44.0 kg/kWp -3.3 kg/kWp for JAT54S40-475/LR
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 JAM54S40-455/LR
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 108 108 Same
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#433 vs #2,714
JAT54S40-475/LR leads by 2,281 places
Power density
#467 vs #2,888
JAT54S40-475/LR leads by 2,421 places
Heat behaviour
#511 vs #2,165
JAT54S40-475/LR leads by 1,654 places
Weight
#165 vs #365
JAT54S40-475/LR leads by 200 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#5,636 vs #7,691
JAT54S40-475/LR leads by 2,055 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAT54S40-475/LR vs JA Solar JAT54S40-485/LR
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAT54S40-475/LR vs JA Solar JAT54S40-480/LR
One difference: module efficiency
Same series, other bin
JA Solar JAT54S40-475/LR vs JA Solar JAT54S41-480/LR
3 differences, the largest is annual degradation
Same series, other bin
JA Solar JAT54S40-475/LR vs JA Solar JAT54S41-475/LR
2 differences, the largest is annual degradation
Same series, other bin
JA Solar JAT54S40-475/LR vs JA Solar JAT54S40-470/LR
One difference: module efficiency
Same series, other bin
JA Solar JAT54S40-475/LR vs JA Solar JAT54S41-470/LR
3 differences, the largest is annual degradation
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAT54S40-475/LR or JA Solar JAM54S40-455/LR?
According to our database: JA Solar JAT54S40-475/LR has higher module efficiency (23.80% vs 22.80%); JA Solar JAT54S40-475/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 JAT54S40-475/LR and JA Solar JAM54S40-455/LR?
JA Solar JAT54S40-475/LR has a module efficiency of 23.80%, while JA Solar JAM54S40-455/LR is 22.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAT54S40-475/LR use vs JA Solar JAM54S40-455/LR?
JA Solar JAT54S40-475/LR uses TOPCon cells; JA Solar JAM54S40-455/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 JAT54S40-475/LR and JA Solar JAM54S40-455/LR?
JA Solar JAT54S40-475/LR has a 30 years power warranty; JA Solar JAM54S40-455/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.