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JAM66D46-740/LB vs JAM72D30-570/LB/1500V 6 of 19 identical Swap Change panels

JA Solar JAM66D46-740/LB vs JA Solar JAM72D30-570/LB/1500V

JA Solar JAM66D46-740/LB
JAM66D46-740/LB
740 Wp 23.80 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
JAM72D30-570/LB/1500V
570 Wp 21.50 % PERC Bifacial
Open panel page Datasheet PDF
The verdict

JAM66D46-740/LB leads on the differences that matter

The largest is module efficiency: 2.30 pp more efficient. 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 JAM66D46-740/LB JAM72D30-570/LB/1500V Difference
Module efficiency 23.80 % 21.50 % 2.30 pp more efficient
Temperature coefficient -0.290 %/°C -0.350 %/°C 0.060 %/°C better in heat
Rated power 740 Wp 570 Wp 170 W more power
Power density 238.2 Wp/m² 215.5 Wp/m² 22.8 Wp/m² higher
Weight 38.2 kg 32.5 kg 5.7 kg lighter
Weight per kWp 51.6 kg/kWp 57.0 kg/kWp 5.4 kg/kWp lighter
Short-circuit current 18.73 A 14.37 A 4.36 A apart
Module area 3.106 m² 2.646 m² 0.461 m² apart
Cell technology TOPCon PERC TOPCon vs PERC
Current at max power 17.64 A 13.62 A 4.02 A apart
Cell count 132 144 12 cells apart
Annual degradation 0.40 %/yr 0.45 %/yr 0.05 %/yr slower
Dimensions 2384x1303x33 mm 2333x1134x30 mm 2384x1303x33 mm vs 2333x1134x30 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
JAM66D46-740/LB
24,828 kWh
JAM72D30-570/LB/1500V
18,771 kWh
Lifetime gap
6,057 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM66D46-740/LB JAM72D30-570/LB/1500V
Standard test conditions 25 °C 100.0% of rated power 740 W 570 W
Cool, bright day 40 °C 94.8% of rated power 708 W 540 W
Typical summer roof 55 °C 89.5% of rated power 676 W 510 W
Hot roof 70 °C 84.2% of rated power 643 W 480 W
03

Full specification

Parameter JAM66D46-740/LB JAM72D30-570/LB/1500V Difference
Power and efficiency
Rated power 740 Wp 570 Wp +170 W for JAM66D46-740/LB
Module efficiency 23.80 % 21.50 % +2.30 pp for JAM66D46-740/LB
Power density 238.2 Wp/m² 215.5 Wp/m² +22.8 Wp/m² for JAM66D46-740/LB
Open-circuit voltage 49.80 V 50.68 V Effectively the same
Voltage at max power 41.96 V 41.87 V Effectively the same
Short-circuit current 18.73 A 14.37 A 4.36 A apart
Current at max power 17.64 A 13.62 A 4.02 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.350 %/°C +0.060 %/°C for JAM66D46-740/LB
Mechanical
Dimensions 2384x1303x33 mm 2333x1134x30 mm 2384x1303x33 mm vs 2333x1134x30 mm
Module area 3.106 m² 2.646 m² 0.461 m² apart
Weight 38.2 kg 32.5 kg -5.7 kg for JAM72D30-570/LB/1500V
Weight per kWp 51.6 kg/kWp 57.0 kg/kWp -5.4 kg/kWp for JAM66D46-740/LB
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.45 %/yr -0.05 %/yr for JAM66D46-740/LB
Technology
Cell technology TOPCon PERC TOPCon vs PERC
Cell type Monocrystalline Monocrystalline Same
Cell count 132 144 12 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#433 vs #7,958
JAM66D46-740/LB leads by 7,525 places
Power density
#431 vs #7,777
JAM66D46-740/LB leads by 7,346 places
Heat behaviour
#2,165 vs #10,419
JAM66D46-740/LB leads by 8,254 places
Weight
#4,997 vs #11,009
JAM66D46-740/LB leads by 6,012 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#185 vs #5,958
JAM66D46-740/LB leads by 5,773 places
05

More useful comparisons

Open the full database
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The same specification on paper
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3 differences, the largest is module efficiency
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JA Solar JAM66D46-740/LB vs JA Solar JAM66D46-720/LB
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JA Solar JAM66D46-740/LB vs JA Solar JAM66D46-715/LB
4 differences, the largest is module efficiency
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JA Solar JAM66D46-740/LB vs JA Solar JAM66D46-710/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 JAM72D30-570/LB/1500V?
According to our database: JA Solar JAM66D46-740/LB has higher module efficiency (23.80% vs 21.50%); JA Solar JAM66D46-740/LB tolerates heat better (temp coeff -0.290%/°C vs -0.350%/°C). 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 JAM72D30-570/LB/1500V?
JA Solar JAM66D46-740/LB has a module efficiency of 23.80%, while JA Solar JAM72D30-570/LB/1500V is 21.50%. 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 JAM72D30-570/LB/1500V?
JA Solar JAM66D46-740/LB uses TOPCon cells; JA Solar JAM72D30-570/LB/1500V uses PERC. 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 JAM72D30-570/LB/1500V?
JA Solar JAM66D46-740/LB has a 30 years power warranty; JA Solar JAM72D30-570/LB/1500V 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 JAM72D30-570/LB/1500V bifacial panels?
Both JA Solar JAM66D46-740/LB and JA Solar JAM72D30-570/LB/1500V 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 389 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.