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JAM72D30-580/LB/1500V vs JAM66D45-620/LB 5 of 19 identical Swap Change panels

JA Solar JAM72D30-580/LB/1500V vs JA Solar JAM66D45-620/LB

JAM72D30-580/LB/1500V
580 Wp 21.90 % PERC Bifacial
Open panel page Datasheet PDF
VS
JA Solar JAM66D45-620/LB
JAM66D45-620/LB
620 Wp 23.00 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

JAM66D45-620/LB leads on the differences that matter

The largest is module efficiency: 1.10 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 JAM66D45-620/LB Difference
Module efficiency 21.90 % 23.00 % 1.10 pp more efficient
Temperature coefficient -0.350 %/°C -0.290 %/°C 0.060 %/°C better in heat
Rated power 580 Wp 620 Wp 40 W more power
Power density 219.2 Wp/m² 229.5 Wp/m² 10.3 Wp/m² higher
Short-circuit current 14.50 A 16.13 A 1.63 A apart
Module area 2.646 m² 2.701 m² 0.056 m² apart
Open-circuit voltage 51.04 V 48.50 V 2.54 V apart
Cell technology PERC TOPCon PERC vs TOPCon
Cell count 144 132 12 cells apart
Annual degradation 0.45 %/yr 0.40 %/yr 0.05 %/yr slower
Weight per kWp 56.0 kg/kWp 53.4 kg/kWp 2.6 kg/kWp lighter
Current at max power 13.73 A 15.42 A 1.69 A apart
Voltage at max power 42.24 V 40.21 V 2.03 V apart
Dimensions 2333x1134x30 mm 2382x1134x30 mm 2333x1134x30 mm vs 2382x1134x30 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
JAM66D45-620/LB
20,802 kWh
Lifetime gap
1,702 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM72D30-580/LB/1500V JAM66D45-620/LB
Standard test conditions 25 °C 100.0% of rated power 580 W 620 W
Cool, bright day 40 °C 94.8% of rated power 550 W 593 W
Typical summer roof 55 °C 89.5% of rated power 519 W 566 W
Hot roof 70 °C 84.2% of rated power 489 W 539 W
03

Full specification

Parameter JAM72D30-580/LB/1500V JAM66D45-620/LB Difference
Power and efficiency
Rated power 580 Wp 620 Wp +40 W for JAM66D45-620/LB
Module efficiency 21.90 % 23.00 % +1.10 pp for JAM66D45-620/LB
Power density 219.2 Wp/m² 229.5 Wp/m² +10.3 Wp/m² for JAM66D45-620/LB
Open-circuit voltage 51.04 V 48.50 V 2.54 V apart
Voltage at max power 42.24 V 40.21 V 2.03 V apart
Short-circuit current 14.50 A 16.13 A 1.63 A apart
Current at max power 13.73 A 15.42 A 1.69 A apart
Temperature
Temperature coefficient -0.350 %/°C -0.290 %/°C +0.060 %/°C for JAM66D45-620/LB
Mechanical
Dimensions 2333x1134x30 mm 2382x1134x30 mm 2333x1134x30 mm vs 2382x1134x30 mm
Module area 2.646 m² 2.701 m² 0.056 m² apart
Weight 32.5 kg 33.1 kg Effectively the same
Weight per kWp 56.0 kg/kWp 53.4 kg/kWp -2.6 kg/kWp for JAM66D45-620/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 JAM66D45-620/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 #1,919
JAM66D45-620/LB leads by 4,864 places
Power density
#6,733 vs #2,191
JAM66D45-620/LB leads by 4,542 places
Heat behaviour
#10,419 vs #2,165
JAM66D45-620/LB leads by 8,254 places
Weight
#10,343 vs #7,289
JAM66D45-620/LB leads by 3,054 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#5,178 vs #2,537
JAM66D45-620/LB leads by 2,641 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM72D30-580/LB/1500V vs JA Solar JAM72D30-575/LB/1500V
One difference: module efficiency
Same series, other bin
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 JAM66D45-620/LB vs JA Solar JAM66D45-630/LB
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM72D30-580/LB/1500V or JA Solar JAM66D45-620/LB?
According to our database: JA Solar JAM66D45-620/LB has higher module efficiency (23.00% vs 21.90%); JA Solar JAM66D45-620/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 JAM66D45-620/LB?
JA Solar JAM72D30-580/LB/1500V has a module efficiency of 21.90%, while JA Solar JAM66D45-620/LB is 23.00%. 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 JAM66D45-620/LB?
JA Solar JAM72D30-580/LB/1500V uses PERC cells; JA Solar JAM66D45-620/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 JAM66D45-620/LB?
JA Solar JAM72D30-580/LB/1500V has a 30 years power warranty; JA Solar JAM66D45-620/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 JAM66D45-620/LB bifacial panels?
Both JA Solar JAM72D30-580/LB/1500V and JA Solar JAM66D45-620/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 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.