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66HPH-500M vs 72HPH-545M 10 of 19 identical Swap Change panels

Longi Solar LR5-66HPH-500M vs Longi Solar LR5-72HPH-545M

Longi Solar LR5-66HPH-500M
LR5-66HPH-500M
500 Wp 21.30 % PERC
Open panel page Datasheet PDF
VS
Longi Solar LR5-72HPH-545M
LR5-72HPH-545M
545 Wp 21.10 % PERC
Open panel page Datasheet PDF
The verdict

72HPH-545M leads on the differences that matter

The largest is rated power: 45 W more power. 10 of 19 comparable parameters are identical.

See all 9 differences
How alike are they
10 of 19 comparable
parameters are identical
identical differs
01

What actually differs

9 of 19 parameters
Parameter 66HPH-500M 72HPH-545M Difference
Rated power 500 Wp 545 Wp 45 W more power
Open-circuit voltage 45.55 V 49.65 V 4.10 V apart
Module area 2.349 m² 2.583 m² 0.235 m² apart
Weight 25.1 kg 27.5 kg 2.4 kg lighter
Module efficiency 21.30 % 21.10 % 0.20 pp more efficient
Temperature coefficient -0.350 %/°C -0.340 %/°C 0.010 %/°C better in heat
Cell count 132 144 12 cells apart
Voltage at max power 38.38 V 41.80 V 3.42 V apart
Dimensions 2073x1133x35 mm 2278x1134x35 mm 2073x1133x35 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
66HPH-500M
16,205 kWh
72HPH-545M
17,663 kWh
Lifetime gap
1,458 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 66HPH-500M 72HPH-545M
Standard test conditions 25 °C 100.0% of rated power 500 W 545 W
Cool, bright day 40 °C 94.8% of rated power 474 W 517 W
Typical summer roof 55 °C 89.5% of rated power 448 W 489 W
Hot roof 70 °C 84.2% of rated power 421 W 462 W
03

Full specification

Parameter 66HPH-500M 72HPH-545M Difference
Power and efficiency
Rated power 500 Wp 545 Wp +45 W for 72HPH-545M
Module efficiency 21.30 % 21.10 % +0.20 pp for 66HPH-500M
Power density 212.9 Wp/m² 211.0 Wp/m² Effectively the same
Open-circuit voltage 45.55 V 49.65 V 4.10 V apart
Voltage at max power 38.38 V 41.80 V 3.42 V apart
Short-circuit current 13.90 A 13.92 A Effectively the same
Current at max power 13.03 A 13.04 A Effectively the same
Temperature
Temperature coefficient -0.350 %/°C -0.340 %/°C +0.010 %/°C for 72HPH-545M
Mechanical
Dimensions 2073x1133x35 mm 2278x1134x35 mm 2073x1133x35 mm vs 2278x1134x35 mm
Module area 2.349 m² 2.583 m² 0.235 m² apart
Weight 25.1 kg 27.5 kg -2.4 kg for 66HPH-500M
Weight per kWp 50.2 kg/kWp 50.5 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 PERC Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 144 12 cells apart
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#8,519 vs #9,297
66HPH-500M leads by 778 places
Power density
#8,599 vs #9,312
66HPH-500M leads by 713 places
Heat behaviour
#10,419 vs #8,778
72HPH-545M leads by 1,641 places
Weight
#3,664 vs #3,832
66HPH-500M leads by 168 places
Warranty
#9,798 vs #9,798
Tied - the same position in the database
Overall
#9,679 vs #8,467
72HPH-545M leads by 1,212 places
05

More useful comparisons

Open the full database
Same series, other bin
Longi Solar LR5-66HPH-500M vs Longi Solar LR5-72HPH-565M
10 differences, the largest is rated power
Same series, other bin
Longi Solar LR5-66HPH-500M vs Longi Solar LR5-72HPH-560M
10 differences, the largest is rated power
Same series, other bin
Longi Solar LR5-66HPH-500M vs Longi Solar LR5-72HPH-555M
9 differences, the largest is rated power
Same series, other bin
Longi Solar LR5-66HPH-500M vs Longi Solar LR5-72HPH-550M
8 differences, the largest is rated power
Same series, other bin
Longi Solar LR5-66HPH-500M vs Longi Solar LR5-66HPH-515M
6 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR5-66HPH-500M vs Longi Solar LR5-66HPH-510M
5 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR5-66HPH-500M or Longi Solar LR5-72HPH-545M?
According to our database: Longi Solar LR5-66HPH-500M has higher module efficiency (21.30% vs 21.10%); Longi Solar LR5-72HPH-545M 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 LR5-66HPH-500M and Longi Solar LR5-72HPH-545M?
Longi Solar LR5-66HPH-500M has a module efficiency of 21.30%, while Longi Solar LR5-72HPH-545M is 21.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR5-66HPH-500M use vs Longi Solar LR5-72HPH-545M?
Longi Solar LR5-66HPH-500M uses PERC cells; Longi Solar LR5-72HPH-545M 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-500M and Longi Solar LR5-72HPH-545M?
Longi Solar LR5-66HPH-500M has a 25 years power warranty; Longi Solar LR5-72HPH-545M 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.