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72HVHF-670M vs 72HVD-635M 11 of 19 identical Swap Change panels

Longi Solar LR7-72HVHF-670M vs Longi Solar LR7-72HVD-635M

Longi Solar LR7-72HVHF-670M
LR7-72HVHF-670M
670 Wp 24.80 % N-type
Open panel page Datasheet PDF
VS
LR7-72HVD-635M
635 Wp 23.50 % N-type Bifacial
Open panel page Datasheet PDF
The verdict

72HVHF-670M leads on the differences that matter

The largest is module efficiency: 1.30 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 72HVHF-670M 72HVD-635M Difference
Module efficiency 24.80 % 23.50 % 1.30 pp more efficient
Power density 248.0 Wp/m² 235.1 Wp/m² 13.0 Wp/m² higher
Rated power 670 Wp 635 Wp 35 W more power
Weight 28.5 kg 33.5 kg 5.0 kg lighter
Weight per kWp 42.5 kg/kWp 52.8 kg/kWp 10.2 kg/kWp lighter
Bifacial No Yes No vs Yes
Short-circuit current 15.60 A 15.01 A 0.59 A apart
Current at max power 14.91 A 14.32 A 0.59 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.
72HVHF-670M
22,655 kWh
72HVD-635M
21,471 kWh
Lifetime gap
1,184 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 72HVHF-670M 72HVD-635M
Standard test conditions 25 °C 100.0% of rated power 670 W 635 W
Cool, bright day 40 °C 96.1% of rated power 644 W 610 W
Typical summer roof 55 °C 92.2% of rated power 618 W 585 W
Hot roof 70 °C 88.3% of rated power 592 W 561 W
03

Full specification

Parameter 72HVHF-670M 72HVD-635M Difference
Power and efficiency
Rated power 670 Wp 635 Wp +35 W for 72HVHF-670M
Module efficiency 24.80 % 23.50 % +1.30 pp for 72HVHF-670M
Power density 248.0 Wp/m² 235.1 Wp/m² +13.0 Wp/m² for 72HVHF-670M
Open-circuit voltage 54.30 V 53.50 V Effectively the same
Voltage at max power 44.96 V 44.36 V Effectively the same
Short-circuit current 15.60 A 15.01 A 0.59 A apart
Current at max power 14.91 A 14.32 A 0.59 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 28.5 kg 33.5 kg -5.0 kg for 72HVHF-670M
Weight per kWp 42.5 kg/kWp 52.8 kg/kWp -10.2 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 No Yes No vs Yes
04

Against the whole database

14,005 panels
Efficiency
#12 vs #716
72HVHF-670M leads by 704 places
Power density
#14 vs #741
72HVHF-670M leads by 727 places
Heat behaviour
#511 vs #511
Tied - the same position in the database
Weight
#226 vs #6,429
72HVHF-670M leads by 6,203 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#284 vs #1,462
72HVHF-670M leads by 1,178 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 Longi Solar LR7-72HVD-635M?
According to our database: Longi Solar LR7-72HVHF-670M has higher module efficiency (24.80% vs 23.50%). 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 Longi Solar LR7-72HVD-635M?
Longi Solar LR7-72HVHF-670M has a module efficiency of 24.80%, while Longi Solar LR7-72HVD-635M is 23.50%. 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 Longi Solar LR7-72HVD-635M?
Longi Solar LR7-72HVHF-670M uses N-type cells; Longi Solar LR7-72HVD-635M 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 LR7-72HVHF-670M and Longi Solar LR7-72HVD-635M?
Longi Solar LR7-72HVHF-670M has a 30 years power warranty; Longi Solar LR7-72HVD-635M 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 Longi Solar LR7-72HVD-635M bifacial panels?
Longi Solar LR7-72HVD-635M 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.

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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.