Longi Solar LR5-66HPH-510M vs Longi Solar LR5-72HPH-555M
VS
The verdict
72HPH-555M leads on the differences that matter
The largest is rated power: 45 W more power. 11 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 7 differencesHow alike are they
11
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
7 of 18 parameters
What actually differs
Parameter
66HPH-510M
72HPH-555M
Difference
Rated power
510 Wp
555 Wp
45 W more power
Open-circuit voltage
45.85 V
49.95 V
4.10 V apart
Module area
2.373 m²
2.583 m²
0.210 m² apart
Weight
25.3 kg
27.5 kg
2.2 kg lighter
Cell count
132
144
12 cells apart
Voltage at max power
38.68 V
42.10 V
3.42 V apart
Dimensions
2093x1134x35 mm
2278x1134x35 mm
2093x1134x35 mm vs 2278x1134x35 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.
66HPH-510M
16,529 kWh
72HPH-555M
17,987 kWh
Lifetime gap
1,458 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
66HPH-510M
72HPH-555M
Standard test conditions
25 °C
100.0% of rated power
510 W
555 W
Cool, bright day
40 °C
94.9% of rated power
484 W
527 W
Typical summer roof
55 °C
89.8% of rated power
458 W
498 W
Hot roof
70 °C
84.7% of rated power
432 W
470 W
03
Full specification
Parameter
66HPH-510M
72HPH-555M
Difference
Power and efficiency
Rated power
510 Wp
555 Wp
+45 W for 72HPH-555M
Module efficiency
21.50 %
21.50 %
Same
Power density
214.9 Wp/m²
214.8 Wp/m²
Effectively the same
Open-circuit voltage
45.85 V
49.95 V
4.10 V apart
Voltage at max power
38.68 V
42.10 V
3.42 V apart
Short-circuit current
14.05 A
14.04 A
Effectively the same
Current at max power
13.19 A
13.19 A
Same
Temperature
Temperature coefficient
-0.340 %/°C
-0.340 %/°C
Same
Mechanical
Dimensions
2093x1134x35 mm
2278x1134x35 mm
2093x1134x35 mm vs 2278x1134x35 mm
Module area
2.373 m²
2.583 m²
0.210 m² apart
Weight
25.3 kg
27.5 kg
-2.2 kg for 66HPH-510M
Weight per kWp
49.6 kg/kWp
49.5 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
132
144
12 cells apart
Bifacial
No
No
Same
04
14,005 panels
Against the whole database
Efficiency
#7,958
vs
#7,958
Tied - the same position in the database
Power density
#8,033
vs
#8,034
66HPH-510M leads by 1 place
Heat behaviour
#8,778
vs
#8,778
Tied - the same position in the database
Weight
#3,154
vs
#3,116
72HPH-555M leads by 38 places
Warranty
#9,798
vs
#9,798
Tied - the same position in the database
Overall
#9,133
vs
#7,542
72HPH-555M leads by 1,591 places
05
Open the full database
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Longi Solar LR5-66HPH-510M vs Longi Solar LR5-72HPH-550M
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Longi Solar LR5-66HPH-510M vs Longi Solar LR5-72HPH-545M
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Longi Solar LR5-66HPH-510M vs Longi Solar LR5-66HPH-515M
One difference: module efficiency
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Longi Solar LR5-66HPH-510M vs Longi Solar LR5-54HPH-425M
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06
Written summary
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07
Questions about this pairing
Which panel is better: Longi Solar LR5-66HPH-510M or Longi Solar LR5-72HPH-555M?
According to our database: both panels are closely matched on key specs - the decision often comes down to price and local availability. See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR5-66HPH-510M and Longi Solar LR5-72HPH-555M?
Longi Solar LR5-66HPH-510M has a module efficiency of 21.50%, while Longi Solar LR5-72HPH-555M is 21.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR5-66HPH-510M use vs Longi Solar LR5-72HPH-555M?
Longi Solar LR5-66HPH-510M uses Monocrystalline cells; Longi Solar LR5-72HPH-555M uses PERC. 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 LR5-66HPH-510M and Longi Solar LR5-72HPH-555M?
Longi Solar LR5-66HPH-510M has a 25 years power warranty; Longi Solar LR5-72HPH-555M 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.