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JAM66D45-615/LB vs JAM72D30-580/LB/1500V 5 of 19 identical Swap Change panels

JA Solar JAM66D45-615/LB vs JA Solar JAM72D30-580/LB/1500V

JA Solar JAM66D45-615/LB
JAM66D45-615/LB
615 Wp 22.80 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
JAM72D30-580/LB/1500V
580 Wp 21.90 % PERC Bifacial
Open panel page Datasheet PDF
The verdict

JAM66D45-615/LB leads on the differences that matter

The largest is module efficiency: 0.90 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 JAM66D45-615/LB JAM72D30-580/LB/1500V Difference
Module efficiency 22.80 % 21.90 % 0.90 pp more efficient
Temperature coefficient -0.290 %/°C -0.350 %/°C 0.060 %/°C better in heat
Rated power 615 Wp 580 Wp 35 W more power
Power density 227.7 Wp/m² 219.2 Wp/m² 8.4 Wp/m² higher
Short-circuit current 16.10 A 14.50 A 1.60 A apart
Module area 2.701 m² 2.646 m² 0.056 m² apart
Open-circuit voltage 48.30 V 51.04 V 2.74 V apart
Cell technology TOPCon PERC TOPCon vs PERC
Cell count 132 144 12 cells apart
Annual degradation 0.40 %/yr 0.45 %/yr 0.05 %/yr slower
Weight per kWp 53.8 kg/kWp 56.0 kg/kWp 2.2 kg/kWp lighter
Current at max power 15.39 A 13.73 A 1.66 A apart
Voltage at max power 39.96 V 42.24 V 2.28 V apart
Dimensions 2382x1134x30 mm 2333x1134x30 mm 2382x1134x30 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
JAM66D45-615/LB
20,634 kWh
JAM72D30-580/LB/1500V
19,100 kWh
Lifetime gap
1,534 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM66D45-615/LB JAM72D30-580/LB/1500V
Standard test conditions 25 °C 100.0% of rated power 615 W 580 W
Cool, bright day 40 °C 94.8% of rated power 588 W 550 W
Typical summer roof 55 °C 89.5% of rated power 561 W 519 W
Hot roof 70 °C 84.2% of rated power 535 W 489 W
03

Full specification

Parameter JAM66D45-615/LB JAM72D30-580/LB/1500V Difference
Power and efficiency
Rated power 615 Wp 580 Wp +35 W for JAM66D45-615/LB
Module efficiency 22.80 % 21.90 % +0.90 pp for JAM66D45-615/LB
Power density 227.7 Wp/m² 219.2 Wp/m² +8.4 Wp/m² for JAM66D45-615/LB
Open-circuit voltage 48.30 V 51.04 V 2.74 V apart
Voltage at max power 39.96 V 42.24 V 2.28 V apart
Short-circuit current 16.10 A 14.50 A 1.60 A apart
Current at max power 15.39 A 13.73 A 1.66 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.350 %/°C +0.060 %/°C for JAM66D45-615/LB
Mechanical
Dimensions 2382x1134x30 mm 2333x1134x30 mm 2382x1134x30 mm vs 2333x1134x30 mm
Module area 2.701 m² 2.646 m² 0.056 m² apart
Weight 33.1 kg 32.5 kg Effectively the same
Weight per kWp 53.8 kg/kWp 56.0 kg/kWp -2.2 kg/kWp for JAM66D45-615/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 JAM66D45-615/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
#2,714 vs #6,783
JAM66D45-615/LB leads by 4,069 places
Power density
#3,077 vs #6,733
JAM66D45-615/LB leads by 3,656 places
Heat behaviour
#2,165 vs #10,419
JAM66D45-615/LB leads by 8,254 places
Weight
#7,888 vs #10,343
JAM66D45-615/LB leads by 2,455 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,894 vs #5,178
JAM66D45-615/LB leads by 2,284 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM66D45-615/LB vs JA Solar JAM66D45-630/LB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D45-615/LB vs JA Solar JAM66D45-625/LB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D45-615/LB vs JA Solar JAM66D45-620/LB
One difference: module efficiency
Same series, other bin
JA Solar JAM66D45-615/LB vs JA Solar JAM66D45-610/LB
One difference: module efficiency
Same series, other bin
JA Solar JAM66D45-615/LB vs JA Solar JAM66D45-605/LB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D45-615/LB vs JA Solar JAM72D30-575/LB/1500V
14 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM66D45-615/LB or JA Solar JAM72D30-580/LB/1500V?
According to our database: JA Solar JAM66D45-615/LB has higher module efficiency (22.80% vs 21.90%); JA Solar JAM66D45-615/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 JAM66D45-615/LB and JA Solar JAM72D30-580/LB/1500V?
JA Solar JAM66D45-615/LB has a module efficiency of 22.80%, while JA Solar JAM72D30-580/LB/1500V is 21.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM66D45-615/LB use vs JA Solar JAM72D30-580/LB/1500V?
JA Solar JAM66D45-615/LB uses TOPCon cells; JA Solar JAM72D30-580/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 JAM66D45-615/LB and JA Solar JAM72D30-580/LB/1500V?
JA Solar JAM66D45-615/LB has a 30 years power warranty; JA Solar JAM72D30-580/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 JAM66D45-615/LB and JA Solar JAM72D30-580/LB/1500V bifacial panels?
Both JA Solar JAM66D45-615/LB and JA Solar JAM72D30-580/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 341 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.