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JAM66D46-710/LB vs JAM72S20-455/MR 3 of 19 identical Swap Change panels

JA Solar JAM66D46-710/LB vs JA Solar JAM72S20-455/MR

JA Solar JAM66D46-710/LB
JAM66D46-710/LB
710 Wp 22.90 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
JA Solar JAM72S20-455/MR
JAM72S20-455/MR
455 Wp 20.50 % PERC
Open panel page Datasheet PDF
The verdict

JAM66D46-710/LB leads on the differences that matter

The largest is module efficiency: 2.40 pp more efficient. 3 of 19 comparable parameters are identical.

See all 16 differences
How alike are they
3 of 19 comparable
parameters are identical
identical differs
01

What actually differs

16 of 19 parameters
Parameter JAM66D46-710/LB JAM72S20-455/MR Difference
Module efficiency 22.90 % 20.50 % 2.40 pp more efficient
Temperature coefficient -0.290 %/°C -0.350 %/°C 0.060 %/°C better in heat
Rated power 710 Wp 455 Wp 255 W more power
Power density 228.6 Wp/m² 204.8 Wp/m² 23.8 Wp/m² higher
Performance warranty 30 yrs 25 yrs 5 yrs longer
Annual degradation 0.40 %/yr 0.55 %/yr 0.15 %/yr slower
Weight 38.2 kg 24.5 kg 13.7 kg lighter
Short-circuit current 18.47 A 11.41 A 7.06 A apart
Module area 3.106 m² 2.222 m² 0.885 m² apart
Cell technology TOPCon PERC TOPCon vs PERC
Current at max power 17.32 A 10.88 A 6.44 A apart
Cell count 132 144 12 cells apart
Open-circuit voltage 48.16 V 49.85 V 1.69 V apart
Bifacial Yes No Yes vs No
Dimensions 2384x1303x33 mm 2112x1052x35 mm 2384x1303x33 mm vs 2112x1052x35 mm
Voltage at max power 40.40 V 41.82 V 1.42 V apart
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
JAM66D46-710/LB
23,822 kWh
JAM72S20-455/MR
14,746 kWh
Lifetime gap
9,076 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM66D46-710/LB JAM72S20-455/MR
Standard test conditions 25 °C 100.0% of rated power 710 W 455 W
Cool, bright day 40 °C 94.8% of rated power 679 W 431 W
Typical summer roof 55 °C 89.5% of rated power 648 W 407 W
Hot roof 70 °C 84.2% of rated power 617 W 383 W
03

Full specification

Parameter JAM66D46-710/LB JAM72S20-455/MR Difference
Power and efficiency
Rated power 710 Wp 455 Wp +255 W for JAM66D46-710/LB
Module efficiency 22.90 % 20.50 % +2.40 pp for JAM66D46-710/LB
Power density 228.6 Wp/m² 204.8 Wp/m² +23.8 Wp/m² for JAM66D46-710/LB
Open-circuit voltage 48.16 V 49.85 V 1.69 V apart
Voltage at max power 40.40 V 41.82 V 1.42 V apart
Short-circuit current 18.47 A 11.41 A 7.06 A apart
Current at max power 17.32 A 10.88 A 6.44 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.350 %/°C +0.060 %/°C for JAM66D46-710/LB
Mechanical
Dimensions 2384x1303x33 mm 2112x1052x35 mm 2384x1303x33 mm vs 2112x1052x35 mm
Module area 3.106 m² 2.222 m² 0.885 m² apart
Weight 38.2 kg 24.5 kg -13.7 kg for JAM72S20-455/MR
Weight per kWp 53.8 kg/kWp 53.8 kg/kWp Same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 25 yrs +5 yrs for JAM66D46-710/LB
Annual degradation 0.40 %/yr 0.55 %/yr -0.15 %/yr for JAM66D46-710/LB
Technology
Cell technology TOPCon PERC TOPCon vs PERC
Cell type Monocrystalline Monocrystalline Same
Cell count 132 144 12 cells apart
Bifacial Yes No Yes vs No
04

Against the whole database

14,129 panels
Efficiency
#2,412 vs #11,389
JAM66D46-710/LB leads by 8,977 places
Power density
#2,529 vs #11,552
JAM66D46-710/LB leads by 9,023 places
Heat behaviour
#2,220 vs #10,489
JAM66D46-710/LB leads by 8,269 places
Weight
#7,959 vs #7,974
JAM66D46-710/LB leads by 15 places
Warranty
#21 vs #9,912
JAM66D46-710/LB leads by 9,891 places
Overall
#830 vs #11,286
JAM66D46-710/LB leads by 10,456 places
05

More useful comparisons

Open the full database
Same series, other bin
JA Solar JAM66D46-710/LB vs JA Solar JAM66D46-740/LB
6 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D46-710/LB vs JA Solar JAM66D46-735/LB
5 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D46-710/LB vs JA Solar JAM66D46-730/LB
5 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D46-710/LB vs JA Solar JAM66D46-725/LB
4 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D46-710/LB vs JA Solar JAM66D46-720/LB
3 differences, the largest is module efficiency
Same series, other bin
JA Solar JAM66D46-710/LB vs JA Solar JAM66D46-715/LB
The same specification on paper
06

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM66D46-710/LB or JA Solar JAM72S20-455/MR?
According to our database: JA Solar JAM66D46-710/LB has higher module efficiency (22.90% vs 20.50%); JA Solar JAM66D46-710/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 JAM66D46-710/LB and JA Solar JAM72S20-455/MR?
JA Solar JAM66D46-710/LB has a module efficiency of 22.90%, while JA Solar JAM72S20-455/MR is 20.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM66D46-710/LB use vs JA Solar JAM72S20-455/MR?
JA Solar JAM66D46-710/LB uses TOPCon cells; JA Solar JAM72S20-455/MR 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 JAM66D46-710/LB and JA Solar JAM72S20-455/MR?
JA Solar JAM66D46-710/LB has a 30 years power warranty; JA Solar JAM72S20-455/MR has a 25 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 JAM66D46-710/LB and JA Solar JAM72S20-455/MR bifacial panels?
JA Solar JAM66D46-710/LB is bifacial (captures light from both faces); JA Solar JAM72S20-455/MR is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

Shop prices: See 318 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.