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JAM66D46-720/LB vs LR7-72HVHF-670M 2 of 19 identical Swap Change panels

JA Solar JAM66D46-720/LB vs Longi Solar LR7-72HVHF-670M

JA Solar JAM66D46-720/LB
JAM66D46-720/LB
720 Wp 23.20 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Longi Solar LR7-72HVHF-670M
LR7-72HVHF-670M
670 Wp 24.80 % N-type
Open panel page Datasheet PDF
The verdict

LR7-72HVHF-670M leads on the differences that matter

The largest is module efficiency: 1.60 pp more efficient. 2 of 19 comparable parameters are identical.

See all 17 differences
How alike are they
2 of 19 comparable
parameters are identical
identical differs
01

What actually differs

17 of 19 parameters
Parameter JAM66D46-720/LB LR7-72HVHF-670M Difference
Module efficiency 23.20 % 24.80 % 1.60 pp more efficient
Rated power 720 Wp 670 Wp 50 W more power
Power density 231.8 Wp/m² 248.0 Wp/m² 16.3 Wp/m² higher
Temperature coefficient -0.290 %/°C -0.260 %/°C 0.030 %/°C better in heat
Weight 38.2 kg 28.5 kg 9.7 kg lighter
Weight per kWp 53.1 kg/kWp 42.5 kg/kWp 10.5 kg/kWp lighter
Product warranty 12 yrs 15 yrs 3 yrs longer
Open-circuit voltage 49.00 V 54.30 V 5.30 V apart
Short-circuit current 18.59 A 15.60 A 2.99 A apart
Module area 3.106 m² 2.701 m² 0.405 m² apart
Cell technology TOPCon N-type TOPCon vs N-type
Annual degradation 0.40 %/yr 0.35 %/yr 0.05 %/yr slower
Current at max power 17.48 A 14.91 A 2.57 A apart
Cell count 132 144 12 cells apart
Voltage at max power 41.19 V 44.96 V 3.77 V apart
Bifacial Yes No Yes vs No
Dimensions 2384x1303x33 mm 2382x1134x30 mm 2384x1303x33 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
JAM66D46-720/LB
24,157 kWh
LR7-72HVHF-670M
22,655 kWh
Lifetime gap
1,502 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario JAM66D46-720/LB LR7-72HVHF-670M
Standard test conditions 25 °C 100.0% of rated power 720 W 670 W
Cool, bright day 40 °C 95.7% of rated power 689 W 644 W
Typical summer roof 55 °C 91.3% of rated power 657 W 618 W
Hot roof 70 °C 87.0% of rated power 626 W 592 W
03

Full specification

Parameter JAM66D46-720/LB LR7-72HVHF-670M Difference
Power and efficiency
Rated power 720 Wp 670 Wp +50 W for JAM66D46-720/LB
Module efficiency 23.20 % 24.80 % +1.60 pp for LR7-72HVHF-670M
Power density 231.8 Wp/m² 248.0 Wp/m² +16.3 Wp/m² for LR7-72HVHF-670M
Open-circuit voltage 49.00 V 54.30 V 5.30 V apart
Voltage at max power 41.19 V 44.96 V 3.77 V apart
Short-circuit current 18.59 A 15.60 A 2.99 A apart
Current at max power 17.48 A 14.91 A 2.57 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.260 %/°C +0.030 %/°C for LR7-72HVHF-670M
Mechanical
Dimensions 2384x1303x33 mm 2382x1134x30 mm 2384x1303x33 mm vs 2382x1134x30 mm
Module area 3.106 m² 2.701 m² 0.405 m² apart
Weight 38.2 kg 28.5 kg -9.7 kg for LR7-72HVHF-670M
Weight per kWp 53.1 kg/kWp 42.5 kg/kWp -10.5 kg/kWp for LR7-72HVHF-670M
Warranty and degradation
Product warranty 12 yrs 15 yrs +3 yrs for LR7-72HVHF-670M
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.35 %/yr -0.05 %/yr for LR7-72HVHF-670M
Technology
Cell technology TOPCon N-type TOPCon vs N-type
Cell type Monocrystalline Monocrystalline Same
Cell count 132 144 12 cells apart
Bifacial Yes No Yes vs No
04

Against the whole database

14,005 panels
Efficiency
#1,306 vs #12
LR7-72HVHF-670M leads by 1,294 places
Power density
#1,347 vs #14
LR7-72HVHF-670M leads by 1,333 places
Heat behaviour
#2,165 vs #511
LR7-72HVHF-670M leads by 1,654 places
Weight
#6,810 vs #226
LR7-72HVHF-670M leads by 6,584 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#516 vs #284
LR7-72HVHF-670M leads by 232 places
05

More useful comparisons

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

Written summary

07

Questions about this pairing

Which panel is better: JA Solar JAM66D46-720/LB or Longi Solar LR7-72HVHF-670M?
According to our database: Longi Solar LR7-72HVHF-670M has higher module efficiency (24.80% vs 23.20%); Longi Solar LR7-72HVHF-670M tolerates heat better (temp coeff -0.260%/°C vs -0.290%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of JA Solar JAM66D46-720/LB and Longi Solar LR7-72HVHF-670M?
JA Solar JAM66D46-720/LB has a module efficiency of 23.20%, while Longi Solar LR7-72HVHF-670M is 24.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does JA Solar JAM66D46-720/LB use vs Longi Solar LR7-72HVHF-670M?
JA Solar JAM66D46-720/LB uses TOPCon cells; Longi Solar LR7-72HVHF-670M uses N-type. 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 JAM66D46-720/LB and Longi Solar LR7-72HVHF-670M?
JA Solar JAM66D46-720/LB has a 30 years power warranty; Longi Solar LR7-72HVHF-670M 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 JAM66D46-720/LB and Longi Solar LR7-72HVHF-670M bifacial panels?
JA Solar JAM66D46-720/LB is bifacial (captures light from both faces); Longi Solar LR7-72HVHF-670M is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Compare JA Solar and Longi Solar as manufacturers Portfolio, efficiency, cell technologies and warranty terms

Shop prices: See 386 JA Solar offers · See 174 Longi 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.