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JAM72D30-580/LB/1500V vs JAM66D46-735/LB 5 of 19 identical Swap Change panels

JA Solar JAM72D30-580/LB/1500V vs JA Solar JAM66D46-735/LB

JAM72D30-580/LB/1500V
580 Wp 21.90 % PERC Bifacial
Open panel page Datasheet PDF
VS
JA Solar JAM66D46-735/LB
JAM66D46-735/LB
735 Wp 23.70 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

JAM66D46-735/LB leads on the differences that matter

The largest is module efficiency: 1.80 pp more efficient. 5 of 19 comparable parameters are identical.

See all 14 differences
How alike are they
5 of 19 comparable
parameters are identical
identical differs
01

What actually differs

14 of 19 parameters
Parameter JAM72D30-580/LB/1500V JAM66D46-735/LB Difference
Module efficiency 21.90 % 23.70 % 1.80 pp more efficient
Temperature coefficient -0.350 %/°C -0.290 %/°C 0.060 %/°C better in heat
Rated power 580 Wp 735 Wp 155 W more power
Power density 219.2 Wp/m² 236.6 Wp/m² 17.4 Wp/m² higher
Weight 32.5 kg 38.2 kg 5.7 kg lighter
Short-circuit current 14.50 A 18.70 A 4.20 A apart
Module area 2.646 m² 3.106 m² 0.461 m² apart
Weight per kWp 56.0 kg/kWp 52.0 kg/kWp 4.1 kg/kWp lighter
Cell technology PERC TOPCon PERC vs TOPCon
Current at max power 13.73 A 17.60 A 3.87 A apart
Cell count 144 132 12 cells apart
Annual degradation 0.45 %/yr 0.40 %/yr 0.05 %/yr slower
Open-circuit voltage 51.04 V 49.60 V 1.44 V apart
Dimensions 2333x1134x30 mm 2384x1303x33 mm 2333x1134x30 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
JAM72D30-580/LB/1500V
19,100 kWh
JAM66D46-735/LB
24,661 kWh
Lifetime gap
5,561 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM72D30-580/LB/1500V JAM66D46-735/LB
Standard test conditions 25 °C 100.0% of rated power 580 W 735 W
Cool, bright day 40 °C 94.8% of rated power 550 W 703 W
Typical summer roof 55 °C 89.5% of rated power 519 W 671 W
Hot roof 70 °C 84.2% of rated power 489 W 639 W
03

Full specification

Parameter JAM72D30-580/LB/1500V JAM66D46-735/LB Difference
Power and efficiency
Rated power 580 Wp 735 Wp +155 W for JAM66D46-735/LB
Module efficiency 21.90 % 23.70 % +1.80 pp for JAM66D46-735/LB
Power density 219.2 Wp/m² 236.6 Wp/m² +17.4 Wp/m² for JAM66D46-735/LB
Open-circuit voltage 51.04 V 49.60 V 1.44 V apart
Voltage at max power 42.24 V 41.77 V Effectively the same
Short-circuit current 14.50 A 18.70 A 4.20 A apart
Current at max power 13.73 A 17.60 A 3.87 A apart
Temperature
Temperature coefficient -0.350 %/°C -0.290 %/°C +0.060 %/°C for JAM66D46-735/LB
Mechanical
Dimensions 2333x1134x30 mm 2384x1303x33 mm 2333x1134x30 mm vs 2384x1303x33 mm
Module area 2.646 m² 3.106 m² 0.461 m² apart
Weight 32.5 kg 38.2 kg -5.7 kg for JAM72D30-580/LB/1500V
Weight per kWp 56.0 kg/kWp 52.0 kg/kWp -4.1 kg/kWp for JAM66D46-735/LB
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.45 %/yr 0.40 %/yr -0.05 %/yr for JAM66D46-735/LB
Technology
Cell technology PERC TOPCon PERC vs TOPCon
Cell type Monocrystalline Monocrystalline Same
Cell count 144 132 12 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#6,783 vs #517
JAM66D46-735/LB leads by 6,266 places
Power density
#6,733 vs #582
JAM66D46-735/LB leads by 6,151 places
Heat behaviour
#10,419 vs #2,165
JAM66D46-735/LB leads by 8,254 places
Weight
#10,343 vs #5,413
JAM66D46-735/LB leads by 4,930 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#5,178 vs #233
JAM66D46-735/LB leads by 4,945 places
05

More useful comparisons

Open the full database
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JA Solar JAM72D30-580/LB/1500V vs JA Solar JAM72D30-575/LB/1500V
One difference: module efficiency
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JA Solar JAM72D30-580/LB/1500V vs JA Solar JAM72D30-570/LB/1500V
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72D30-580/LB/1500V vs JA Solar JAM72D30-565/LB/1500V
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72D30-580/LB/1500V vs JA Solar JAM72D30-560/LB/1500V
4 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72D30-580/LB/1500V vs JA Solar JAM72D30-555/LB/1500V
4 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D46-735/LB vs JA Solar JAM66D46-740/LB
The same specification on paper
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM72D30-580/LB/1500V or JA Solar JAM66D46-735/LB?
According to our database: JA Solar JAM66D46-735/LB has higher module efficiency (23.70% vs 21.90%); JA Solar JAM66D46-735/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 JAM72D30-580/LB/1500V and JA Solar JAM66D46-735/LB?
JA Solar JAM72D30-580/LB/1500V has a module efficiency of 21.90%, while JA Solar JAM66D46-735/LB is 23.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM72D30-580/LB/1500V use vs JA Solar JAM66D46-735/LB?
JA Solar JAM72D30-580/LB/1500V uses PERC cells; JA Solar JAM66D46-735/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 JAM72D30-580/LB/1500V and JA Solar JAM66D46-735/LB?
JA Solar JAM72D30-580/LB/1500V has a 30 years power warranty; JA Solar JAM66D46-735/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 JAM72D30-580/LB/1500V and JA Solar JAM66D46-735/LB bifacial panels?
Both JA Solar JAM72D30-580/LB/1500V and JA Solar JAM66D46-735/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 340 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.