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JAM66D45-650/LB vs JAM66D46-740/LB 12 of 19 identical Swap Change panels

JA Solar JAM66D45-650/LB vs JA Solar JAM66D46-740/LB

JA Solar JAM66D45-650/LB
JAM66D45-650/LB
650 Wp 24.10 % TOPCon Bifacial
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

7 differences, and they point both ways

The largest is rated power: 90 W more power. 12 of 19 comparable parameters are identical.

See all 7 differences
How alike are they
12 of 19 comparable
parameters are identical
identical differs
01

What actually differs

7 of 19 parameters
Parameter JAM66D45-650/LB JAM66D46-740/LB Difference
Rated power 650 Wp 740 Wp 90 W more power
Weight 33.1 kg 38.2 kg 5.1 kg lighter
Module area 2.701 m² 3.106 m² 0.405 m² apart
Module efficiency 24.10 % 23.80 % 0.30 pp more efficient
Short-circuit current 17.99 A 18.73 A 0.74 A apart
Current at max power 16.30 A 17.64 A 1.34 A apart
Dimensions 2382x1134x30 mm 2384x1303x33 mm 2382x1134x30 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
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.
JAM66D45-650/LB
21,809 kWh
JAM66D46-740/LB
24,828 kWh
Lifetime gap
3,019 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM66D45-650/LB JAM66D46-740/LB
Standard test conditions 25 °C 100.0% of rated power 650 W 740 W
Cool, bright day 40 °C 95.7% of rated power 622 W 708 W
Typical summer roof 55 °C 91.3% of rated power 593 W 676 W
Hot roof 70 °C 87.0% of rated power 565 W 643 W
03

Full specification

Parameter JAM66D45-650/LB JAM66D46-740/LB Difference
Power and efficiency
Rated power 650 Wp 740 Wp +90 W for JAM66D46-740/LB
Module efficiency 24.10 % 23.80 % +0.30 pp for JAM66D45-650/LB
Power density 240.6 Wp/m² 238.2 Wp/m² Effectively the same
Open-circuit voltage 49.97 V 49.80 V Effectively the same
Voltage at max power 41.67 V 41.96 V Effectively the same
Short-circuit current 17.99 A 18.73 A 0.74 A apart
Current at max power 16.30 A 17.64 A 1.34 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2382x1134x30 mm 2384x1303x33 mm 2382x1134x30 mm vs 2384x1303x33 mm
Module area 2.701 m² 3.106 m² 0.405 m² apart
Weight 33.1 kg 38.2 kg -5.1 kg for JAM66D45-650/LB
Weight per kWp 50.9 kg/kWp 51.6 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 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 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#219 vs #433
JAM66D45-650/LB leads by 214 places
Power density
#233 vs #431
JAM66D45-650/LB leads by 198 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#4,300 vs #4,997
JAM66D45-650/LB leads by 697 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,158 vs #185
JAM66D46-740/LB leads by 973 places
05

More useful comparisons

Open the full database
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JA Solar JAM66D45-650/LB vs JA Solar JAM66D46-735/LB
8 differences, the largest is rated power
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JA Solar JAM66D45-650/LB vs JA Solar JAM66D46-730/LB
8 differences, the largest is rated power
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JA Solar JAM66D45-650/LB vs JA Solar JAM66D46-725/LB
8 differences, the largest is module efficiency
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JA Solar JAM66D45-650/LB vs JA Solar JAM66D46-720/LB
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Same series, other bin
JA Solar JAM66D45-650/LB vs JA Solar JAM66D46-715/LB
10 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D45-650/LB vs JA Solar JAM66D46-710/LB
10 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM66D45-650/LB or JA Solar JAM66D46-740/LB?
According to our database: JA Solar JAM66D45-650/LB has higher module efficiency (24.10% vs 23.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM66D45-650/LB and JA Solar JAM66D46-740/LB?
JA Solar JAM66D45-650/LB has a module efficiency of 24.10%, 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 JAM66D45-650/LB use vs JA Solar JAM66D46-740/LB?
JA Solar JAM66D45-650/LB 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 JAM66D45-650/LB and JA Solar JAM66D46-740/LB?
JA Solar JAM66D45-650/LB 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 JAM66D45-650/LB and JA Solar JAM66D46-740/LB bifacial panels?
Both JA Solar JAM66D45-650/LB and JA Solar JAM66D46-740/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 342 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.