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

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

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

Full specification

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

Against the whole database

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

More useful comparisons

Open the full database
Same series, other bin
Longi Solar LR7-72HVHF-670M vs Longi Solar LR7-72HVHF-665M
One difference: module efficiency
Same series, other bin
Longi Solar LR7-72HVHF-670M vs Longi Solar LR7-72HVHF-660M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HVHF-670M vs Longi Solar LR7-72HVHF-655M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HVHF-670M vs Longi Solar LR7-72HVHF-650M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HVHF-670M vs Longi Solar LR7-72HVHF-645M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HVHF-670M vs Longi Solar LR7-72HVHF-640M
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR7-72HVHF-670M or JA Solar JAM66D46-720/LB?
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 Longi Solar LR7-72HVHF-670M and JA Solar JAM66D46-720/LB?
Longi Solar LR7-72HVHF-670M has a module efficiency of 24.80%, while JA Solar JAM66D46-720/LB is 23.20%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR7-72HVHF-670M use vs JA Solar JAM66D46-720/LB?
Longi Solar LR7-72HVHF-670M uses N-type cells; JA Solar JAM66D46-720/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 Longi Solar LR7-72HVHF-670M and JA Solar JAM66D46-720/LB?
Longi Solar LR7-72HVHF-670M has a 30 years power warranty; JA Solar JAM66D46-720/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 Longi Solar LR7-72HVHF-670M and JA Solar JAM66D46-720/LB 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 Longi Solar and JA Solar as manufacturers Portfolio, efficiency, cell technologies and warranty terms

Shop prices: See 145 Longi Solar offers · See 348 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.