Longi Solar LR5-72HPH-545M vs Longi Solar LR5-66HPH-515M
VS
The verdict
66HPH-515M leads on the differences that matter
The largest is module efficiency: 0.60 pp more efficient. 9 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 9 differencesHow alike are they
9
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
9 of 18 parameters
What actually differs
Parameter
72HPH-545M
66HPH-515M
Difference
Module efficiency
21.10 %
21.70 %
0.60 pp more efficient
Rated power
545 Wp
515 Wp
30 W more power
Power density
211.0 Wp/m²
217.0 Wp/m²
6.0 Wp/m² higher
Module area
2.583 m²
2.373 m²
0.210 m² apart
Open-circuit voltage
49.65 V
46.00 V
3.65 V apart
Weight
27.5 kg
25.3 kg
2.2 kg lighter
Cell count
144
132
12 cells apart
Voltage at max power
41.80 V
38.83 V
2.97 V apart
Dimensions
2278x1134x35 mm
2093x1134x35 mm
2278x1134x35 mm vs 2093x1134x35 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
Same temp coeff. for both panels (-0.340 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
72HPH-545M
17,663 kWh
66HPH-515M
16,691 kWh
Lifetime gap
972 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
72HPH-545M
66HPH-515M
Standard test conditions
25 °C
100.0% of rated power
545 W
515 W
Cool, bright day
40 °C
94.9% of rated power
517 W
489 W
Typical summer roof
55 °C
89.8% of rated power
489 W
462 W
Hot roof
70 °C
84.7% of rated power
462 W
436 W
03
Full specification
Parameter
72HPH-545M
66HPH-515M
Difference
Power and efficiency
Rated power
545 Wp
515 Wp
+30 W for 72HPH-545M
Module efficiency
21.10 %
21.70 %
+0.60 pp for 66HPH-515M
Power density
211.0 Wp/m²
217.0 Wp/m²
+6.0 Wp/m² for 66HPH-515M
Open-circuit voltage
49.65 V
46.00 V
3.65 V apart
Voltage at max power
41.80 V
38.83 V
2.97 V apart
Short-circuit current
13.92 A
14.13 A
Effectively the same
Current at max power
13.04 A
13.27 A
Effectively the same
Temperature
Temperature coefficient
-0.340 %/°C
-0.340 %/°C
Same
Mechanical
Dimensions
2278x1134x35 mm
2093x1134x35 mm
2278x1134x35 mm vs 2093x1134x35 mm
Module area
2.583 m²
2.373 m²
0.210 m² apart
Weight
27.5 kg
25.3 kg
-2.2 kg for 66HPH-515M
Weight per kWp
50.5 kg/kWp
49.1 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
25 yrs
25 yrs
Same
Annual degradation
0.55 %/yr
0.55 %/yr
Same
Technology
Cell technology
PERC
-
Not published by Longi Solar
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
144
132
12 cells apart
Bifacial
No
No
Same
04
14,005 panels
Against the whole database
Efficiency
#9,297
vs
#7,421
66HPH-515M leads by 1,876 places
Power density
#9,312
vs
#7,426
66HPH-515M leads by 1,886 places
Heat behaviour
#8,778
vs
#8,778
Tied - the same position in the database
Weight
#3,832
vs
#2,764
66HPH-515M leads by 1,068 places
Warranty
#9,798
vs
#9,798
Tied - the same position in the database
Overall
#8,467
vs
#8,762
72HPH-545M leads by 295 places
05
Open the full database
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Longi Solar LR5-72HPH-545M vs Longi Solar LR5-72HPH-555M
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06
Written summary
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07
Questions about this pairing
Which panel is better: Longi Solar LR5-72HPH-545M or Longi Solar LR5-66HPH-515M?
According to our database: Longi Solar LR5-66HPH-515M has higher module efficiency (21.70% vs 21.10%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR5-72HPH-545M and Longi Solar LR5-66HPH-515M?
Longi Solar LR5-72HPH-545M has a module efficiency of 21.10%, while Longi Solar LR5-66HPH-515M is 21.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR5-72HPH-545M use vs Longi Solar LR5-66HPH-515M?
Longi Solar LR5-72HPH-545M uses PERC cells; Longi Solar LR5-66HPH-515M uses Monocrystalline. 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 LR5-72HPH-545M and Longi Solar LR5-66HPH-515M?
Longi Solar LR5-72HPH-545M has a 25 years power warranty; Longi Solar LR5-66HPH-515M has a 25 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.
Shop prices: See 147 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.