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JAM54D40-475/LB vs JAM54D41 LB 450W 10 of 19 identical Swap Change panels

JA Solar JAM54D40-475/LB vs JA Solar JAM54D41 LB 450W

JA Solar JAM54D40-475/LB
JAM54D40-475/LB
475 Wp 23.80 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
JA Solar JAM54D41 LB 450W
JAM54D41 LB 450W
450 Wp 22.50 % N-type Bifacial
Open panel page Datasheet PDF
The verdict

JAM54D40-475/LB leads on the differences that matter

The largest is module efficiency: 1.30 pp more efficient. 10 of 19 comparable parameters are identical.

See all 9 differences
How alike are they
10 of 19 comparable
parameters are identical
identical differs
01

What actually differs

9 of 19 parameters
Parameter JAM54D40-475/LB JAM54D41 LB 450W Difference
Module efficiency 23.80 % 22.50 % 1.30 pp more efficient
Power density 237.7 Wp/m² 225.2 Wp/m² 12.5 Wp/m² higher
Product warranty 15 yrs 25 yrs 10 yrs longer
Rated power 475 Wp 450 Wp 25 W more power
Short-circuit current 16.19 A 14.48 A 1.71 A apart
Temperature coefficient -0.290 %/°C -0.300 %/°C 0.010 %/°C better in heat
Cell technology TOPCon N-type TOPCon vs N-type
Weight per kWp 46.3 kg/kWp 48.9 kg/kWp 2.6 kg/kWp lighter
Open-circuit voltage 40.55 V 39.30 V 1.25 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
JAM54D40-475/LB
15,937 kWh
JAM54D41 LB 450W
15,098 kWh
Lifetime gap
839 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM54D40-475/LB JAM54D41 LB 450W
Standard test conditions 25 °C 100.0% of rated power 475 W 450 W
Cool, bright day 40 °C 95.5% of rated power 454 W 430 W
Typical summer roof 55 °C 91.0% of rated power 434 W 410 W
Hot roof 70 °C 86.5% of rated power 413 W 389 W
03

Full specification

Parameter JAM54D40-475/LB JAM54D41 LB 450W Difference
Power and efficiency
Rated power 475 Wp 450 Wp +25 W for JAM54D40-475/LB
Module efficiency 23.80 % 22.50 % +1.30 pp for JAM54D40-475/LB
Power density 237.7 Wp/m² 225.2 Wp/m² +12.5 Wp/m² for JAM54D40-475/LB
Open-circuit voltage 40.55 V 39.30 V 1.25 V apart
Voltage at max power 33.68 V 32.82 V Effectively the same
Short-circuit current 16.19 A 14.48 A 1.71 A apart
Current at max power 14.11 A 13.71 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.300 %/°C +0.010 %/°C for JAM54D40-475/LB
Mechanical
Dimensions 1762x1134x30 mm 1762x1134x30 mm Same
Module area 1.998 m² 1.998 m² Same
Weight 22.0 kg 22.0 kg Same
Weight per kWp 46.3 kg/kWp 48.9 kg/kWp -2.6 kg/kWp for JAM54D40-475/LB
Warranty and degradation
Product warranty 15 yrs 25 yrs +10 yrs for JAM54D41 LB 450W
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology TOPCon N-type TOPCon vs N-type
Cell type Monocrystalline Monocrystalline Same
Cell count 108 108 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#433 vs #4,222
JAM54D40-475/LB leads by 3,789 places
Power density
#467 vs #4,225
JAM54D40-475/LB leads by 3,758 places
Heat behaviour
#2,165 vs #6,093
JAM54D40-475/LB leads by 3,928 places
Weight
#1,117 vs #2,563
JAM54D40-475/LB leads by 1,446 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#5,786 vs #6,097
JAM54D40-475/LB leads by 311 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM54D40-475/LB vs JA Solar JAM54D40-470/LB
2 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM54D40-475/LB vs JA Solar JAM54D40-465/LB
4 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM54D40-475/LB vs JA Solar JAM54D40-460/LB
5 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM54D40-475/LB vs JA Solar JAM54D40-455/LB
7 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM54D40-475/LB vs JA Solar JAM54D41-455/LB
6 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM54D40-475/LB vs JA Solar JAM54D41 455/LB
8 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM54D40-475/LB or JA Solar JAM54D41 LB 450W?
According to our database: JA Solar JAM54D40-475/LB has higher module efficiency (23.80% vs 22.50%); JA Solar JAM54D40-475/LB tolerates heat better (temp coeff -0.290%/°C vs -0.300%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM54D40-475/LB and JA Solar JAM54D41 LB 450W?
JA Solar JAM54D40-475/LB has a module efficiency of 23.80%, while JA Solar JAM54D41 LB 450 W is 22.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM54D40-475/LB use vs JA Solar JAM54D41 LB 450W?
JA Solar JAM54D40-475/LB uses TOPCon cells; JA Solar JAM54D41 LB 450 W uses N-type. 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 JAM54D40-475/LB and JA Solar JAM54D41 LB 450W?
JA Solar JAM54D40-475/LB has a 30 years power warranty; JA Solar JAM54D41 LB 450 W 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 JAM54D40-475/LB and JA Solar JAM54D41 LB 450W bifacial panels?
Both JA Solar JAM54D40-475/LB and JA Solar JAM54D41 LB 450 W are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.

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.