Skip to main content
JAM72D30-550/GB/1500V vs JAM66D45-615/LB 4 of 19 identical Swap Change panels

JA Solar JAM72D30-550/GB/1500V vs JA Solar JAM66D45-615/LB

JAM72D30-550/GB/1500V
550 Wp 21.30 % PERC Bifacial
Open panel page Datasheet PDF
VS
JA Solar JAM66D45-615/LB
JAM66D45-615/LB
615 Wp 22.80 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

JAM66D45-615/LB leads on the differences that matter

The largest is module efficiency: 1.50 pp more efficient. 4 of 19 comparable parameters are identical.

See all 15 differences
How alike are they
4 of 19 comparable
parameters are identical
identical differs
01

What actually differs

15 of 19 parameters
Parameter JAM72D30-550/GB/1500V JAM66D45-615/LB Difference
Module efficiency 21.30 % 22.80 % 1.50 pp more efficient
Temperature coefficient -0.350 %/°C -0.290 %/°C 0.060 %/°C better in heat
Rated power 550 Wp 615 Wp 65 W more power
Power density 212.9 Wp/m² 227.7 Wp/m² 14.8 Wp/m² higher
Short-circuit current 14.00 A 16.10 A 2.10 A apart
Module area 2.583 m² 2.701 m² 0.118 m² apart
Weight per kWp 57.8 kg/kWp 53.8 kg/kWp 4.0 kg/kWp lighter
Cell technology PERC TOPCon PERC vs TOPCon
Current at max power 13.11 A 15.39 A 2.28 A apart
Cell count 144 132 12 cells apart
Annual degradation 0.45 %/yr 0.40 %/yr 0.05 %/yr slower
Weight 31.8 kg 33.1 kg 1.3 kg lighter
Open-circuit voltage 49.90 V 48.30 V 1.60 V apart
Voltage at max power 41.96 V 39.96 V 2.00 V apart
Dimensions 2278x1134x30 mm 2382x1134x30 mm 2278x1134x30 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
JAM72D30-550/GB/1500V
18,112 kWh
JAM66D45-615/LB
20,634 kWh
Lifetime gap
2,522 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM72D30-550/GB/1500V JAM66D45-615/LB
Standard test conditions 25 °C 100.0% of rated power 550 W 615 W
Cool, bright day 40 °C 94.8% of rated power 521 W 588 W
Typical summer roof 55 °C 89.5% of rated power 492 W 561 W
Hot roof 70 °C 84.2% of rated power 463 W 535 W
03

Full specification

Parameter JAM72D30-550/GB/1500V JAM66D45-615/LB Difference
Power and efficiency
Rated power 550 Wp 615 Wp +65 W for JAM66D45-615/LB
Module efficiency 21.30 % 22.80 % +1.50 pp for JAM66D45-615/LB
Power density 212.9 Wp/m² 227.7 Wp/m² +14.8 Wp/m² for JAM66D45-615/LB
Open-circuit voltage 49.90 V 48.30 V 1.60 V apart
Voltage at max power 41.96 V 39.96 V 2.00 V apart
Short-circuit current 14.00 A 16.10 A 2.10 A apart
Current at max power 13.11 A 15.39 A 2.28 A apart
Temperature
Temperature coefficient -0.350 %/°C -0.290 %/°C +0.060 %/°C for JAM66D45-615/LB
Mechanical
Dimensions 2278x1134x30 mm 2382x1134x30 mm 2278x1134x30 mm vs 2382x1134x30 mm
Module area 2.583 m² 2.701 m² 0.118 m² apart
Weight 31.8 kg 33.1 kg -1.3 kg for JAM72D30-550/GB/1500V
Weight per kWp 57.8 kg/kWp 53.8 kg/kWp -4.0 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 0.45 %/yr 0.40 %/yr -0.05 %/yr for JAM66D45-615/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

14,129 panels
Efficiency
#8,585 vs #2,769
JAM66D45-615/LB leads by 5,816 places
Power density
#8,563 vs #3,132
JAM66D45-615/LB leads by 5,431 places
Heat behaviour
#10,489 vs #2,220
JAM66D45-615/LB leads by 8,269 places
Weight
#11,526 vs #7,965
JAM66D45-615/LB leads by 3,561 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#7,043 vs #2,930
JAM66D45-615/LB leads by 4,113 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM72D30-550/GB/1500V vs JA Solar JAM66D45-630/LB
15 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72D30-550/GB/1500V vs JA Solar JAM66D45-625/LB
15 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72D30-550/GB/1500V vs JA Solar JAM66D45-620/LB
15 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72D30-550/GB/1500V vs JA Solar JAM66D45-610/LB
15 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72D30-550/GB/1500V vs JA Solar JAM66D45-605/LB
15 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM72D30-550/GB/1500V vs JA Solar JAM72D30-580/LB/1500V
8 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM72D30-550/GB/1500V or JA Solar JAM66D45-615/LB?
According to our database: JA Solar JAM66D45-615/LB has higher module efficiency (22.80% vs 21.30%); 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 JAM72D30-550/GB/1500V and JA Solar JAM66D45-615/LB?
JA Solar JAM72D30-550/GB/1500V has a module efficiency of 21.30%, while JA Solar JAM66D45-615/LB is 22.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM72D30-550/GB/1500V use vs JA Solar JAM66D45-615/LB?
JA Solar JAM72D30-550/GB/1500V uses PERC cells; JA Solar JAM66D45-615/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 JAM72D30-550/GB/1500V and JA Solar JAM66D45-615/LB?
JA Solar JAM72D30-550/GB/1500V has a 30 years power warranty; JA Solar JAM66D45-615/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 JAM72D30-550/GB/1500V and JA Solar JAM66D45-615/LB bifacial panels?
Both JA Solar JAM72D30-550/GB/1500V and JA Solar JAM66D45-615/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 314 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.