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JAT54S41-475/LR vs JAM66D46-740/LB 6 of 19 identical Swap Change panels

JA Solar JAT54S41-475/LR vs JA Solar JAM66D46-740/LB

JA Solar JAT54S41-475/LR
JAT54S41-475/LR
475 Wp 23.80 % TOPCon
Open panel page Datasheet PDF
VS
JA Solar JAM66D46-740/LB
JAM66D46-740/LB
740 Wp 23.80 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

JAT54S41-475/LR leads on the differences that matter

The largest is rated power: 265 W more power. 6 of 19 comparable parameters are identical.

See all 13 differences
How alike are they
6 of 19 comparable
parameters are identical
identical differs
01

What actually differs

13 of 19 parameters
Parameter JAT54S41-475/LR JAM66D46-740/LB Difference
Rated power 475 Wp 740 Wp 265 W more power
Temperature coefficient -0.260 %/°C -0.290 %/°C 0.030 %/°C better in heat
Weight 19.3 kg 38.2 kg 18.9 kg lighter
Weight per kWp 40.6 kg/kWp 51.6 kg/kWp 11.0 kg/kWp lighter
Product warranty 25 yrs 12 yrs 13 yrs longer
Open-circuit voltage 41.03 V 49.80 V 8.77 V apart
Short-circuit current 14.90 A 18.73 A 3.83 A apart
Module area 1.998 m² 3.106 m² 1.108 m² apart
Voltage at max power 34.87 V 41.96 V 7.09 V apart
Current at max power 13.63 A 17.64 A 4.01 A apart
Cell count 108 132 24 cells apart
Bifacial No Yes No vs Yes
Dimensions 1762x1134x30 mm 2384x1303x33 mm 1762x1134x30 mm vs 2384x1303x33 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
JAT54S41-475/LR
15,937 kWh
JAM66D46-740/LB
24,828 kWh
Lifetime gap
8,891 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAT54S41-475/LR JAM66D46-740/LB
Standard test conditions 25 °C 100.0% of rated power 475 W 740 W
Cool, bright day 40 °C 95.7% of rated power 456 W 708 W
Typical summer roof 55 °C 91.3% of rated power 438 W 676 W
Hot roof 70 °C 87.0% of rated power 419 W 643 W
03

Full specification

Parameter JAT54S41-475/LR JAM66D46-740/LB Difference
Power and efficiency
Rated power 475 Wp 740 Wp +265 W for JAM66D46-740/LB
Module efficiency 23.80 % 23.80 % Same
Power density 237.7 Wp/m² 238.2 Wp/m² Effectively the same
Open-circuit voltage 41.03 V 49.80 V 8.77 V apart
Voltage at max power 34.87 V 41.96 V 7.09 V apart
Short-circuit current 14.90 A 18.73 A 3.83 A apart
Current at max power 13.63 A 17.64 A 4.01 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.290 %/°C +0.030 %/°C for JAT54S41-475/LR
Mechanical
Dimensions 1762x1134x30 mm 2384x1303x33 mm 1762x1134x30 mm vs 2384x1303x33 mm
Module area 1.998 m² 3.106 m² 1.108 m² apart
Weight 19.3 kg 38.2 kg -18.9 kg for JAT54S41-475/LR
Weight per kWp 40.6 kg/kWp 51.6 kg/kWp -11.0 kg/kWp for JAT54S41-475/LR
Warranty and degradation
Product warranty 25 yrs 12 yrs +13 yrs for JAT54S41-475/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

Against the whole database

14,005 panels
Efficiency
#433 vs #433
Tied - the same position in the database
Power density
#467 vs #431
JAM66D46-740/LB leads by 36 places
Heat behaviour
#511 vs #2,165
JAT54S41-475/LR leads by 1,654 places
Weight
#165 vs #4,997
JAT54S41-475/LR leads by 4,832 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#3,637 vs #185
JAM66D46-740/LB leads by 3,452 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAT54S41-475/LR vs JA Solar JAT54S41-480/LR
One difference: module efficiency
Same series, other bin
JA Solar JAT54S41-475/LR vs JA Solar JAT54S41-470/LR
One difference: module efficiency
Same series, other bin
JA Solar JAT54S41-475/LR vs JA Solar JAT54S41-465/LR
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAT54S41-475/LR vs JA Solar JAT54S41-460/LR
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAT54S41-475/LR vs JA Solar JAT54S41-455/LR
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D46-740/LB vs JA Solar JAM66D46-735/LB
The same specification on paper
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAT54S41-475/LR or JA Solar JAM66D46-740/LB?
According to our database: JA Solar JAT54S41-475/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 JAT54S41-475/LR and JA Solar JAM66D46-740/LB?
JA Solar JAT54S41-475/LR has a module efficiency of 23.80%, while JA Solar JAM66D46-740/LB is 23.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAT54S41-475/LR use vs JA Solar JAM66D46-740/LB?
JA Solar JAT54S41-475/LR uses TOPCon cells; JA Solar JAM66D46-740/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 JAT54S41-475/LR and JA Solar JAM66D46-740/LB?
JA Solar JAT54S41-475/LR has a 30 years power warranty; JA Solar JAM66D46-740/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 JAT54S41-475/LR and JA Solar JAM66D46-740/LB bifacial panels?
JA Solar JAM66D46-740/LB is bifacial (captures light from both faces); JA Solar JAT54S41-475/LR is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

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.