Longi Solar LR5-72HPH-555M vs Longi Solar LR5-66HPH-500M
VS
The verdict
72HPH-555M leads on the differences that matter
The largest is rated power: 55 W more power. 10 of 19 comparable parameters are identical.
See all 9 differencesHow alike are they
10
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
9 of 19 parameters
What actually differs
Parameter
72HPH-555M
66HPH-500M
Difference
Rated power
555 Wp
500 Wp
55 W more power
Open-circuit voltage
49.95 V
45.55 V
4.40 V apart
Module area
2.583 m²
2.349 m²
0.235 m² apart
Weight
27.5 kg
25.1 kg
2.4 kg lighter
Module efficiency
21.50 %
21.30 %
0.20 pp more efficient
Temperature coefficient
-0.340 %/°C
-0.350 %/°C
0.010 %/°C better in heat
Cell count
144
132
12 cells apart
Voltage at max power
42.10 V
38.38 V
3.72 V apart
Dimensions
2278x1134x35 mm
2073x1133x35 mm
2278x1134x35 mm vs 2073x1133x35 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
72HPH-555M
17,987 kWh
66HPH-500M
16,205 kWh
Lifetime gap
1,782 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
72HPH-555M
66HPH-500M
Standard test conditions
25 °C
100.0% of rated power
555 W
500 W
Cool, bright day
40 °C
94.8% of rated power
527 W
474 W
Typical summer roof
55 °C
89.5% of rated power
498 W
448 W
Hot roof
70 °C
84.2% of rated power
470 W
421 W
03
Full specification
Parameter
72HPH-555M
66HPH-500M
Difference
Power and efficiency
Rated power
555 Wp
500 Wp
+55 W for 72HPH-555M
Module efficiency
21.50 %
21.30 %
+0.20 pp for 72HPH-555M
Power density
214.8 Wp/m²
212.9 Wp/m²
Effectively the same
Open-circuit voltage
49.95 V
45.55 V
4.40 V apart
Voltage at max power
42.10 V
38.38 V
3.72 V apart
Short-circuit current
14.04 A
13.90 A
Effectively the same
Current at max power
13.19 A
13.03 A
Effectively the same
Temperature
Temperature coefficient
-0.340 %/°C
-0.350 %/°C
+0.010 %/°C for 72HPH-555M
Mechanical
Dimensions
2278x1134x35 mm
2073x1133x35 mm
2278x1134x35 mm vs 2073x1133x35 mm
Module area
2.583 m²
2.349 m²
0.235 m² apart
Weight
27.5 kg
25.1 kg
-2.4 kg for 66HPH-500M
Weight per kWp
49.5 kg/kWp
50.2 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
PERC
Same
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
#7,958
vs
#8,519
72HPH-555M leads by 561 places
Power density
#8,034
vs
#8,599
72HPH-555M leads by 565 places
Heat behaviour
#8,778
vs
#10,419
72HPH-555M leads by 1,641 places
Weight
#3,116
vs
#3,664
72HPH-555M leads by 548 places
Warranty
#9,798
vs
#9,798
Tied - the same position in the database
Overall
#7,542
vs
#9,679
72HPH-555M leads by 2,137 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: Longi Solar LR5-72HPH-555M or Longi Solar LR5-66HPH-500M?
According to our database: Longi Solar LR5-72HPH-555M has higher module efficiency (21.50% vs 21.30%); Longi Solar LR5-72HPH-555M tolerates heat better (temp coeff -0.340%/°C vs -0.350%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR5-72HPH-555M and Longi Solar LR5-66HPH-500M?
Longi Solar LR5-72HPH-555M has a module efficiency of 21.50%, while Longi Solar LR5-66HPH-500M is 21.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR5-72HPH-555M use vs Longi Solar LR5-66HPH-500M?
Longi Solar LR5-72HPH-555M uses PERC cells; Longi Solar LR5-66HPH-500M 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 LR5-72HPH-555M and Longi Solar LR5-66HPH-500M?
Longi Solar LR5-72HPH-555M has a 25 years power warranty; Longi Solar LR5-66HPH-500M 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 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.