Longi Solar LR7-54HJD-510M vs Longi Solar LR7-72HVHF-665M
VS
The verdict
54HJD-510M leads on the differences that matter
The largest is rated power: 155 W more power. 5 of 19 comparable parameters are identical.
See all 14 differencesHow alike are they
5
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
14 of 19 parameters
What actually differs
Parameter
54HJD-510M
72HVHF-665M
Difference
Rated power
510 Wp
665 Wp
155 W more power
Weight
23.5 kg
28.5 kg
5.0 kg lighter
Product warranty
30 yrs
15 yrs
15 yrs longer
Temperature coefficient
-0.240 %/°C
-0.260 %/°C
0.020 %/°C better in heat
Module efficiency
25.00 %
24.60 %
0.40 pp more efficient
Open-circuit voltage
41.55 V
54.20 V
12.65 V apart
Module area
2.041 m²
2.701 m²
0.660 m² apart
Cell technology
Back Contact
N-type
Back Contact vs N-type
Power density
249.9 Wp/m²
246.2 Wp/m²
3.7 Wp/m² higher
Weight per kWp
46.1 kg/kWp
42.9 kg/kWp
3.2 kg/kWp lighter
Voltage at max power
34.37 V
44.86 V
10.49 V apart
Cell count
108
144
36 cells apart
Bifacial
Yes
No
Yes vs No
Dimensions
1800x1134x30 mm
2382x1134x30 mm
1800x1134x30 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
54HJD-510M
17,245 kWh
72HVHF-665M
22,486 kWh
Lifetime gap
5,241 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
54HJD-510M
72HVHF-665M
Standard test conditions
25 °C
100.0% of rated power
510 W
665 W
Cool, bright day
40 °C
96.1% of rated power
492 W
639 W
Typical summer roof
55 °C
92.2% of rated power
473 W
613 W
Hot roof
70 °C
88.3% of rated power
455 W
587 W
03
Full specification
Parameter
54HJD-510M
72HVHF-665M
Difference
Power and efficiency
Rated power
510 Wp
665 Wp
+155 W for 72HVHF-665M
Module efficiency
25.00 %
24.60 %
+0.40 pp for 54HJD-510M
Power density
249.9 Wp/m²
246.2 Wp/m²
+3.7 Wp/m² for 54HJD-510M
Open-circuit voltage
41.55 V
54.20 V
12.65 V apart
Voltage at max power
34.37 V
44.86 V
10.49 V apart
Short-circuit current
15.52 A
15.52 A
Same
Current at max power
14.84 A
14.83 A
Effectively the same
Temperature
Temperature coefficient
-0.240 %/°C
-0.260 %/°C
+0.020 %/°C for 54HJD-510M
Mechanical
Dimensions
1800x1134x30 mm
2382x1134x30 mm
1800x1134x30 mm vs 2382x1134x30 mm
Module area
2.041 m²
2.701 m²
0.660 m² apart
Weight
23.5 kg
28.5 kg
-5.0 kg for 54HJD-510M
Weight per kWp
46.1 kg/kWp
42.9 kg/kWp
-3.2 kg/kWp for 72HVHF-665M
Warranty and degradation
Product warranty
30 yrs
15 yrs
+15 yrs for 54HJD-510M
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.35 %/yr
0.35 %/yr
Same
Technology
Cell technology
Back Contact
N-type
Back Contact vs N-type
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
108
144
36 cells apart
Bifacial
Yes
No
Yes vs No
04
14,005 panels
Against the whole database
Efficiency
#4
vs
#51
54HJD-510M leads by 47 places
Power density
#7
vs
#42
54HJD-510M leads by 35 places
Heat behaviour
#13
vs
#511
54HJD-510M leads by 498 places
Weight
#979
vs
#244
72HVHF-665M leads by 735 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,144
vs
#387
72HVHF-665M leads by 757 places
05
Open the full database
More useful comparisons
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Longi Solar LR7-54HJD-510M vs Longi Solar LR7-54HJD-505M
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Longi Solar LR7-54HJD-510M vs Longi Solar LR7-54HJD-500M
3 differences, the largest is module efficiency
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Longi Solar LR7-54HJD-510M vs Longi Solar LR7-54HJD-495M
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Same series, other bin
Longi Solar LR7-72HVHF-665M vs Longi Solar LR7-72HVHF-670M
One difference: module efficiency
Same series, other bin
Longi Solar LR7-72HVHF-665M vs Longi Solar LR7-72HVHF-660M
One difference: module efficiency
Same series, other bin
Longi Solar LR7-72HVHF-665M vs Longi Solar LR7-72HVHF-655M
3 differences, the largest is module efficiency
06
Written summary
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07
Questions about this pairing
Which panel is better: Longi Solar LR7-54HJD-510M or Longi Solar LR7-72HVHF-665M?
According to our database: Longi Solar LR7-54HJD-510M has higher module efficiency (25.00% vs 24.60%); Longi Solar LR7-54HJD-510M tolerates heat better (temp coeff -0.240%/°C vs -0.260%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR7-54HJD-510M and Longi Solar LR7-72HVHF-665M?
Longi Solar LR7-54HJD-510M has a module efficiency of 25.00%, while Longi Solar LR7-72HVHF-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 LR7-54HJD-510M use vs Longi Solar LR7-72HVHF-665M?
Longi Solar LR7-54HJD-510M uses Back Contact cells; Longi Solar LR7-72HVHF-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 LR7-54HJD-510M and Longi Solar LR7-72HVHF-665M?
Longi Solar LR7-54HJD-510M has a 30 years power warranty; Longi Solar LR7-72HVHF-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 LR7-54HJD-510M and Longi Solar LR7-72HVHF-665M bifacial panels?
Longi Solar LR7-54HJD-510M is bifacial (captures light from both faces); Longi Solar LR7-72HVHF-665M is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Shop prices: 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.