Skip to main content
JAM54D41-445/LB vs JAM54D40-470/LB 13 of 19 identical Swap Change panels

JA Solar JAM54D41-445/LB vs JA Solar JAM54D40-470/LB

JA Solar JAM54D41-445/LB
JAM54D41-445/LB
445 Wp 22.30 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
JA Solar JAM54D40-470/LB
JAM54D40-470/LB
470 Wp 23.50 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

JAM54D40-470/LB leads on the differences that matter

The largest is module efficiency: 1.20 pp more efficient. 13 of 19 comparable parameters are identical.

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

What actually differs

6 of 19 parameters
Parameter JAM54D41-445/LB JAM54D40-470/LB Difference
Module efficiency 22.30 % 23.50 % 1.20 pp more efficient
Power density 222.7 Wp/m² 235.2 Wp/m² 12.5 Wp/m² higher
Rated power 445 Wp 470 Wp 25 W more power
Weight per kWp 49.4 kg/kWp 46.8 kg/kWp 2.6 kg/kWp lighter
Short-circuit current 14.50 A 15.16 A 0.66 A apart
Voltage at max power 32.47 V 33.50 V 1.03 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
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.
JAM54D41-445/LB
14,931 kWh
JAM54D40-470/LB
15,769 kWh
Lifetime gap
838 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM54D41-445/LB JAM54D40-470/LB
Standard test conditions 25 °C 100.0% of rated power 445 W 470 W
Cool, bright day 40 °C 95.7% of rated power 426 W 450 W
Typical summer roof 55 °C 91.3% of rated power 406 W 429 W
Hot roof 70 °C 87.0% of rated power 387 W 409 W
03

Full specification

Parameter JAM54D41-445/LB JAM54D40-470/LB Difference
Power and efficiency
Rated power 445 Wp 470 Wp +25 W for JAM54D40-470/LB
Module efficiency 22.30 % 23.50 % +1.20 pp for JAM54D40-470/LB
Power density 222.7 Wp/m² 235.2 Wp/m² +12.5 Wp/m² for JAM54D40-470/LB
Open-circuit voltage 39.10 V 40.00 V Effectively the same
Voltage at max power 32.47 V 33.50 V 1.03 V apart
Short-circuit current 14.50 A 15.16 A 0.66 A apart
Current at max power 13.75 A 14.03 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
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 49.4 kg/kWp 46.8 kg/kWp -2.6 kg/kWp for JAM54D40-470/LB
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
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 108 108 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#5,100 vs #716
JAM54D40-470/LB leads by 4,384 places
Power density
#5,302 vs #674
JAM54D40-470/LB leads by 4,628 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#2,959 vs #1,356
JAM54D40-470/LB leads by 1,603 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#8,801 vs #6,332
JAM54D40-470/LB leads by 2,469 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM54D41-445/LB vs JA Solar JAM54D40-475/LB
7 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM54D41-445/LB vs JA Solar JAM54D40-465/LB
5 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM54D41-445/LB vs JA Solar JAM54D40-460/LB
4 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM54D41-445/LB vs JA Solar JAM54D40-455/LB
4 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM54D41-445/LB vs JA Solar JAM54D41-455/LB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM54D41-445/LB vs JA Solar JAM54D41 455/LB
5 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM54D41-445/LB or JA Solar JAM54D40-470/LB?
According to our database: JA Solar JAM54D40-470/LB has higher module efficiency (23.50% vs 22.30%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM54D41-445/LB and JA Solar JAM54D40-470/LB?
JA Solar JAM54D41-445/LB has a module efficiency of 22.30%, while JA Solar JAM54D40-470/LB is 23.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM54D41-445/LB use vs JA Solar JAM54D40-470/LB?
JA Solar JAM54D41-445/LB uses TOPCon cells; JA Solar JAM54D40-470/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 JAM54D41-445/LB and JA Solar JAM54D40-470/LB?
JA Solar JAM54D41-445/LB has a 30 years power warranty; JA Solar JAM54D40-470/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 JAM54D41-445/LB and JA Solar JAM54D40-470/LB bifacial panels?
Both JA Solar JAM54D41-445/LB and JA Solar JAM54D40-470/LB 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 394 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.