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72HTH-615M vs 72HVDF-665M 8 of 19 identical Swap Change panels

Longi Solar LR7-72HTH-615M vs Longi Solar LR7-72HVDF-665M

Longi Solar LR7-72HTH-615M
LR7-72HTH-615M
615 Wp 22.80 % N-type
Open panel page Datasheet PDF
VS
Longi Solar LR7-72HVDF-665M
LR7-72HVDF-665M
665 Wp 24.60 % N-type Bifacial
Open panel page Datasheet PDF
The verdict

72HVDF-665M leads on the differences that matter

The largest is module efficiency: 1.80 pp more efficient. 8 of 19 comparable parameters are identical.

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

What actually differs

11 of 19 parameters
Parameter 72HTH-615M 72HVDF-665M Difference
Module efficiency 22.80 % 24.60 % 1.80 pp more efficient
Rated power 615 Wp 665 Wp 50 W more power
Power density 227.7 Wp/m² 246.2 Wp/m² 18.5 Wp/m² higher
Performance warranty 25 yrs 30 yrs 5 yrs longer
Weight 28.5 kg 33.5 kg 5.0 kg lighter
Temperature coefficient -0.280 %/°C -0.260 %/°C 0.020 %/°C better in heat
Weight per kWp 46.3 kg/kWp 50.4 kg/kWp 4.0 kg/kWp lighter
Annual degradation 0.40 %/yr 0.35 %/yr 0.05 %/yr slower
Open-circuit voltage 52.57 V 54.52 V 1.95 V apart
Bifacial No Yes No vs Yes
Current at max power 13.88 A 14.72 A 0.84 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
72HTH-615M
20,634 kWh
72HVDF-665M
22,486 kWh
Lifetime gap
1,852 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 72HTH-615M 72HVDF-665M
Standard test conditions 25 °C 100.0% of rated power 615 W 665 W
Cool, bright day 40 °C 95.8% of rated power 589 W 639 W
Typical summer roof 55 °C 91.6% of rated power 563 W 613 W
Hot roof 70 °C 87.4% of rated power 538 W 587 W
03

Full specification

Parameter 72HTH-615M 72HVDF-665M Difference
Power and efficiency
Rated power 615 Wp 665 Wp +50 W for 72HVDF-665M
Module efficiency 22.80 % 24.60 % +1.80 pp for 72HVDF-665M
Power density 227.7 Wp/m² 246.2 Wp/m² +18.5 Wp/m² for 72HVDF-665M
Open-circuit voltage 52.57 V 54.52 V 1.95 V apart
Voltage at max power 44.33 V 45.17 V Effectively the same
Short-circuit current 14.87 A 15.35 A Effectively the same
Current at max power 13.88 A 14.72 A 0.84 A apart
Temperature
Temperature coefficient -0.280 %/°C -0.260 %/°C +0.020 %/°C for 72HVDF-665M
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 72HTH-615M
Weight per kWp 46.3 kg/kWp 50.4 kg/kWp -4.0 kg/kWp for 72HTH-615M
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 25 yrs 30 yrs +5 yrs for 72HVDF-665M
Annual degradation 0.40 %/yr 0.35 %/yr -0.05 %/yr for 72HVDF-665M
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
#2,714 vs #51
72HVDF-665M leads by 2,663 places
Power density
#3,077 vs #42
72HVDF-665M leads by 3,035 places
Heat behaviour
#1,309 vs #511
72HVDF-665M leads by 798 places
Weight
#1,120 vs #3,742
72HTH-615M leads by 2,622 places
Warranty
#9,798 vs #21
72HVDF-665M leads by 9,777 places
Overall
#3,219 vs #414
72HVDF-665M leads by 2,805 places
05

More useful comparisons

Open the full database
Same series, other bin
Longi Solar LR7-72HTH-615M vs Longi Solar LR7-72HTH-610M
One difference: module efficiency
Same series, other bin
Longi Solar LR7-72HTH-615M vs Longi Solar LR7-72HTH-605M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HVDF-665M vs Longi Solar LR7-72HVDF-660M
One difference: module efficiency
Same series, other bin
Longi Solar LR7-72HVDF-665M vs Longi Solar LR7-72HVDF-655M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HVDF-665M vs Longi Solar LR7-72HVDF-650M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HVDF-665M vs Longi Solar LR7-72HVDF-645M
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR7-72HTH-615M or Longi Solar LR7-72HVDF-665M?
According to our database: Longi Solar LR7-72HVDF-665M has higher module efficiency (24.60% vs 22.80%); Longi Solar LR7-72HVDF-665M tolerates heat better (temp coeff -0.260%/°C vs -0.280%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR7-72HTH-615M and Longi Solar LR7-72HVDF-665M?
Longi Solar LR7-72HTH-615M has a module efficiency of 22.80%, while Longi Solar LR7-72HVDF-665M is 24.60%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR7-72HTH-615M use vs Longi Solar LR7-72HVDF-665M?
Longi Solar LR7-72HTH-615M uses N-type cells; Longi Solar LR7-72HVDF-665M 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 LR7-72HTH-615M and Longi Solar LR7-72HVDF-665M?
Longi Solar LR7-72HTH-615M has a 25 years power warranty; Longi Solar LR7-72HVDF-665M 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 LR7-72HTH-615M and Longi Solar LR7-72HVDF-665M bifacial panels?
Longi Solar LR7-72HVDF-665M is bifacial (captures light from both faces); Longi Solar LR7-72HTH-615M is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

Shop prices: See 179 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.