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740/LB vs 720/LB 16 of 19 identical Swap Change panels

JA Solar JAM66D46-740/LB vs JA Solar JAM66D46-720/LB

JA Solar JAM66D46-740/LB
JAM66D46-740/LB
740 Wp 23.80 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
JA Solar JAM66D46-720/LB
JAM66D46-720/LB
720 Wp 23.20 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

740/LB leads on the differences that matter

The largest is module efficiency: 0.60 pp more efficient. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter 740/LB 720/LB Difference
Module efficiency 23.80 % 23.20 % 0.60 pp more efficient
Power density 238.2 Wp/m² 231.8 Wp/m² 6.4 Wp/m² higher
Rated power 740 Wp 720 Wp 20 W more power
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.
740/LB
24,828 kWh
720/LB
24,157 kWh
Lifetime gap
671 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 740/LB 720/LB
Standard test conditions 25 °C 100.0% of rated power 740 W 720 W
Cool, bright day 40 °C 95.7% of rated power 708 W 689 W
Typical summer roof 55 °C 91.3% of rated power 676 W 657 W
Hot roof 70 °C 87.0% of rated power 643 W 626 W
03

Full specification

Parameter 740/LB 720/LB Difference
Power and efficiency
Rated power 740 Wp 720 Wp +20 W for 740/LB
Module efficiency 23.80 % 23.20 % +0.60 pp for 740/LB
Power density 238.2 Wp/m² 231.8 Wp/m² +6.4 Wp/m² for 740/LB
Open-circuit voltage 49.80 V 49.00 V Effectively the same
Voltage at max power 41.96 V 41.19 V Effectively the same
Short-circuit current 18.73 A 18.59 A Effectively the same
Current at max power 17.64 A 17.48 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2384x1303x33 mm 2384x1303x33 mm Same
Module area 3.106 m² 3.106 m² Same
Weight 38.2 kg 38.2 kg Same
Weight per kWp 51.6 kg/kWp 53.1 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
#433 vs #1,306
740/LB leads by 873 places
Power density
#431 vs #1,347
740/LB leads by 916 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#4,997 vs #6,810
740/LB leads by 1,813 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#185 vs #516
740/LB leads by 331 places
05

More useful comparisons

Open the full database
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JA Solar JAM66D46-740/LB vs JA Solar JAM66D46-735/LB
The same specification on paper
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JA Solar JAM66D46-740/LB vs JA Solar JAM66D46-730/LB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D46-740/LB vs JA Solar JAM66D46-725/LB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D46-740/LB vs JA Solar JAM66D46-715/LB
4 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D46-740/LB vs JA Solar JAM66D46-710/LB
6 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D46-740/LB vs JA Solar JAM66D46-705/LB
6 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM66D46-740/LB or JA Solar JAM66D46-720/LB?
According to our database: JA Solar JAM66D46-740/LB has higher module efficiency (23.80% vs 23.20%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM66D46-740/LB and JA Solar JAM66D46-720/LB?
JA Solar JAM66D46-740/LB has a module efficiency of 23.80%, while JA Solar JAM66D46-720/LB is 23.20%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM66D46-740/LB use vs JA Solar JAM66D46-720/LB?
JA Solar JAM66D46-740/LB uses TOPCon cells; JA Solar JAM66D46-720/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 JAM66D46-740/LB and JA Solar JAM66D46-720/LB?
JA Solar JAM66D46-740/LB has a 30 years power warranty; JA Solar JAM66D46-720/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 JAM66D46-740/LB and JA Solar JAM66D46-720/LB bifacial panels?
Both JA Solar JAM66D46-740/LB and JA Solar JAM66D46-720/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 390 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.