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66HPH-510M vs 72HPH-545M 9 of 18 identical Swap Change panels

Longi Solar LR5-66HPH-510M vs Longi Solar LR5-72HPH-545M

Longi Solar LR5-66HPH-510M
LR5-66HPH-510M
510 Wp 21.50 %
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

66HPH-510M leads on the differences that matter

The largest is rated power: 35 W more power. 9 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 9 differences
How alike are they
9 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

9 of 18 parameters
Parameter 66HPH-510M 72HPH-545M Difference
Rated power 510 Wp 545 Wp 35 W more power
Module efficiency 21.50 % 21.10 % 0.40 pp more efficient
Module area 2.373 m² 2.583 m² 0.210 m² apart
Open-circuit voltage 45.85 V 49.65 V 3.80 V apart
Weight 25.3 kg 27.5 kg 2.2 kg lighter
Power density 214.9 Wp/m² 211.0 Wp/m² 3.9 Wp/m² higher
Cell count 132 144 12 cells apart
Voltage at max power 38.68 V 41.80 V 3.12 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-545M
17,663 kWh
Lifetime gap
1,134 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 66HPH-510M 72HPH-545M
Standard test conditions 25 °C 100.0% of rated power 510 W 545 W
Cool, bright day 40 °C 94.9% of rated power 484 W 517 W
Typical summer roof 55 °C 89.8% of rated power 458 W 489 W
Hot roof 70 °C 84.7% of rated power 432 W 462 W
03

Full specification

Parameter 66HPH-510M 72HPH-545M Difference
Power and efficiency
Rated power 510 Wp 545 Wp +35 W for 72HPH-545M
Module efficiency 21.50 % 21.10 % +0.40 pp for 66HPH-510M
Power density 214.9 Wp/m² 211.0 Wp/m² +3.9 Wp/m² for 66HPH-510M
Open-circuit voltage 45.85 V 49.65 V 3.80 V apart
Voltage at max power 38.68 V 41.80 V 3.12 V apart
Short-circuit current 14.05 A 13.92 A Effectively the same
Current at max power 13.19 A 13.04 A Effectively the 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 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 Not published by Longi Solar
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
#7,958 vs #9,297
66HPH-510M leads by 1,339 places
Power density
#8,033 vs #9,312
66HPH-510M leads by 1,279 places
Heat behaviour
#8,778 vs #8,778
Tied - the same position in the database
Weight
#3,154 vs #3,832
66HPH-510M leads by 678 places
Warranty
#9,798 vs #9,798
Tied - the same position in the database
Overall
#9,133 vs #8,467
72HPH-545M leads by 666 places
05

More useful comparisons

Open the full database
Same series, other bin
Longi Solar LR5-66HPH-510M vs Longi Solar LR5-72HPH-565M
9 differences, the largest is rated power
Same series, other bin
Longi Solar LR5-66HPH-510M vs Longi Solar LR5-72HPH-560M
8 differences, the largest is rated power
Same series, other bin
Longi Solar LR5-66HPH-510M vs Longi Solar LR5-72HPH-555M
7 differences, the largest is rated power
Same series, other bin
Longi Solar LR5-66HPH-510M vs Longi Solar LR5-72HPH-550M
8 differences, the largest is rated power
Same series, other bin
Longi Solar LR5-66HPH-510M vs Longi Solar LR5-66HPH-515M
One difference: module efficiency
Same series, other bin
Longi Solar LR5-66HPH-510M vs Longi Solar LR5-54HPH-425M
8 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR5-66HPH-510M or Longi Solar LR5-72HPH-545M?
According to our database: Longi Solar LR5-66HPH-510M has higher module efficiency (21.50% 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 LR5-66HPH-510M and Longi Solar LR5-72HPH-545M?
Longi Solar LR5-66HPH-510M has a module efficiency of 21.50%, 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-510M use vs Longi Solar LR5-72HPH-545M?
Longi Solar LR5-66HPH-510M uses Monocrystalline 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-510M and Longi Solar LR5-72HPH-545M?
Longi Solar LR5-66HPH-510M 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 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.