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72HPH-550M vs 66HPH-500M 11 of 19 identical Swap Change panels

Longi Solar LR5-72HPH-550M vs Longi Solar LR5-66HPH-500M

Longi Solar LR5-72HPH-550M
LR5-72HPH-550M
550 Wp 21.30 % PERC
Open panel page Datasheet PDF
VS
Longi Solar LR5-66HPH-500M
LR5-66HPH-500M
500 Wp 21.30 % PERC
Open panel page Datasheet PDF
The verdict

72HPH-550M leads on the differences that matter

The largest is rated power: 50 W more power. 11 of 19 comparable parameters are identical.

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

What actually differs

8 of 19 parameters
Parameter 72HPH-550M 66HPH-500M Difference
Rated power 550 Wp 500 Wp 50 W more power
Open-circuit voltage 49.80 V 45.55 V 4.25 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
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 41.95 V 38.38 V 3.57 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-550M
17,825 kWh
66HPH-500M
16,205 kWh
Lifetime gap
1,620 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 72HPH-550M 66HPH-500M
Standard test conditions 25 °C 100.0% of rated power 550 W 500 W
Cool, bright day 40 °C 94.8% of rated power 522 W 474 W
Typical summer roof 55 °C 89.5% of rated power 494 W 448 W
Hot roof 70 °C 84.2% of rated power 466 W 421 W
03

Full specification

Parameter 72HPH-550M 66HPH-500M Difference
Power and efficiency
Rated power 550 Wp 500 Wp +50 W for 72HPH-550M
Module efficiency 21.30 % 21.30 % Same
Power density 212.9 Wp/m² 212.9 Wp/m² Same
Open-circuit voltage 49.80 V 45.55 V 4.25 V apart
Voltage at max power 41.95 V 38.38 V 3.57 V apart
Short-circuit current 13.98 A 13.90 A Effectively the same
Current at max power 13.12 A 13.03 A Effectively the same
Temperature
Temperature coefficient -0.340 %/°C -0.350 %/°C +0.010 %/°C for 72HPH-550M
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 50.0 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

Against the whole database

14,005 panels
Efficiency
#8,519 vs #8,519
Tied - the same position in the database
Power density
#8,497 vs #8,599
72HPH-550M leads by 102 places
Heat behaviour
#8,778 vs #10,419
72HPH-550M leads by 1,641 places
Weight
#3,298 vs #3,664
72HPH-550M leads by 366 places
Warranty
#9,798 vs #9,798
Tied - the same position in the database
Overall
#8,006 vs #9,679
72HPH-550M leads by 1,673 places
05

More useful comparisons

Open the full database
Same series, other bin
Longi Solar LR5-72HPH-550M vs Longi Solar LR5-72HPH-565M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR5-72HPH-550M vs Longi Solar LR5-72HPH-560M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR5-72HPH-550M vs Longi Solar LR5-72HPH-555M
One difference: module efficiency
Same series, other bin
Longi Solar LR5-72HPH-550M vs Longi Solar LR5-72HPH-545M
One difference: module efficiency
Same series, other bin
Longi Solar LR5-72HPH-550M vs Longi Solar LR5-66HPH-515M
9 differences, the largest is rated power
Same series, other bin
Longi Solar LR5-72HPH-550M vs Longi Solar LR5-66HPH-510M
8 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR5-72HPH-550M or Longi Solar LR5-66HPH-500M?
According to our database: Longi Solar LR5-72HPH-550M 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-550M and Longi Solar LR5-66HPH-500M?
Longi Solar LR5-72HPH-550M has a module efficiency of 21.30%, 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-550M use vs Longi Solar LR5-66HPH-500M?
Longi Solar LR5-72HPH-550M 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-550M and Longi Solar LR5-66HPH-500M?
Longi Solar LR5-72HPH-550M 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.