Skip to main content
72HVDF-640M vs 72HVHF-670M 11 of 19 identical Swap Change panels

Longi Solar LR7-72HVDF-640M vs Longi Solar LR7-72HVHF-670M

Longi Solar LR7-72HVDF-640M
LR7-72HVDF-640M
640 Wp 23.70 % N-type 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

72HVHF-670M leads on the differences that matter

The largest is module efficiency: 1.10 pp more efficient. 11 of 19 comparable parameters are identical.

See all 8 differences
How alike are they
11 of 19 comparable
parameters are identical
identical differs
01

What actually differs

8 of 19 parameters
Parameter 72HVDF-640M 72HVHF-670M Difference
Module efficiency 23.70 % 24.80 % 1.10 pp more efficient
Power density 236.9 Wp/m² 248.0 Wp/m² 11.1 Wp/m² higher
Rated power 640 Wp 670 Wp 30 W more power
Weight 33.5 kg 28.5 kg 5.0 kg lighter
Weight per kWp 52.3 kg/kWp 42.5 kg/kWp 9.8 kg/kWp lighter
Bifacial Yes No Yes vs No
Short-circuit current 14.98 A 15.60 A 0.62 A apart
Current at max power 14.33 A 14.91 A 0.58 A 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
Same temp coeff. for both panels (-0.260 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
72HVDF-640M
21,640 kWh
72HVHF-670M
22,655 kWh
Lifetime gap
1,015 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 72HVDF-640M 72HVHF-670M
Standard test conditions 25 °C 100.0% of rated power 640 W 670 W
Cool, bright day 40 °C 96.1% of rated power 615 W 644 W
Typical summer roof 55 °C 92.2% of rated power 590 W 618 W
Hot roof 70 °C 88.3% of rated power 565 W 592 W
03

Full specification

Parameter 72HVDF-640M 72HVHF-670M Difference
Power and efficiency
Rated power 640 Wp 670 Wp +30 W for 72HVHF-670M
Module efficiency 23.70 % 24.80 % +1.10 pp for 72HVHF-670M
Power density 236.9 Wp/m² 248.0 Wp/m² +11.1 Wp/m² for 72HVHF-670M
Open-circuit voltage 54.02 V 54.30 V Effectively the same
Voltage at max power 44.67 V 44.96 V Effectively the same
Short-circuit current 14.98 A 15.60 A 0.62 A apart
Current at max power 14.33 A 14.91 A 0.58 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.260 %/°C Same
Mechanical
Dimensions 2382x1134x30 mm 2382x1134x30 mm Same
Module area 2.701 m² 2.701 m² Same
Weight 33.5 kg 28.5 kg -5.0 kg for 72HVHF-670M
Weight per kWp 52.3 kg/kWp 42.5 kg/kWp -9.8 kg/kWp for 72HVHF-670M
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.35 %/yr 0.35 %/yr Same
Technology
Cell technology N-type N-type Same
Cell type Monocrystalline Monocrystalline Same
Cell count 144 144 Same
Bifacial Yes No Yes vs No
04

Against the whole database

14,005 panels
Efficiency
#517 vs #12
72HVHF-670M leads by 505 places
Power density
#521 vs #14
72HVHF-670M leads by 507 places
Heat behaviour
#511 vs #511
Tied - the same position in the database
Weight
#5,829 vs #226
72HVHF-670M leads by 5,603 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,271 vs #284
72HVHF-670M leads by 987 places
05

More useful comparisons

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

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR7-72HVDF-640M or Longi Solar LR7-72HVHF-670M?
According to our database: Longi Solar LR7-72HVHF-670M has higher module efficiency (24.80% vs 23.70%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR7-72HVDF-640M and Longi Solar LR7-72HVHF-670M?
Longi Solar LR7-72HVDF-640M has a module efficiency of 23.70%, 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 Longi Solar LR7-72HVDF-640M use vs Longi Solar LR7-72HVHF-670M?
Longi Solar LR7-72HVDF-640M uses N-type 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 Longi Solar LR7-72HVDF-640M and Longi Solar LR7-72HVHF-670M?
Longi Solar LR7-72HVDF-640M 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 Longi Solar LR7-72HVDF-640M and Longi Solar LR7-72HVHF-670M bifacial panels?
Longi Solar LR7-72HVDF-640M 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.

Shop prices: See 177 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.