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54HIB-405M vs 66HPH-515M 8 of 18 identical Swap Change panels

Longi Solar LR5-54HIB-405M vs Longi Solar LR5-66HPH-515M

Longi Solar LR5-54HIB-405M
LR5-54HIB-405M
405 Wp 20.70 % PERC
Open panel page Datasheet PDF
VS
Longi Solar LR5-66HPH-515M
LR5-66HPH-515M
515 Wp 21.70 %
Open panel page Datasheet PDF
The verdict

66HPH-515M leads on the differences that matter

The largest is module efficiency: 1.00 pp more efficient. 8 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 10 differences
How alike are they
8 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

10 of 18 parameters
Parameter 54HIB-405M 66HPH-515M Difference
Module efficiency 20.70 % 21.70 % 1.00 pp more efficient
Rated power 405 Wp 515 Wp 110 W more power
Power density 207.4 Wp/m² 217.0 Wp/m² 9.6 Wp/m² higher
Weight 21.5 kg 25.3 kg 3.8 kg lighter
Open-circuit voltage 37.15 V 46.00 V 8.85 V apart
Module area 1.953 m² 2.373 m² 0.421 m² apart
Weight per kWp 53.1 kg/kWp 49.1 kg/kWp 4.0 kg/kWp lighter
Voltage at max power 31.18 V 38.83 V 7.65 V apart
Cell count 108 132 24 cells apart
Dimensions 1722x1134x30 mm 2093x1134x35 mm 1722x1134x30 mm vs 2093x1134x35 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.
54HIB-405M
13,126 kWh
66HPH-515M
16,691 kWh
Lifetime gap
3,565 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 54HIB-405M 66HPH-515M
Standard test conditions 25 °C 100.0% of rated power 405 W 515 W
Cool, bright day 40 °C 94.9% of rated power 384 W 489 W
Typical summer roof 55 °C 89.8% of rated power 364 W 462 W
Hot roof 70 °C 84.7% of rated power 343 W 436 W
03

Full specification

Parameter 54HIB-405M 66HPH-515M Difference
Power and efficiency
Rated power 405 Wp 515 Wp +110 W for 66HPH-515M
Module efficiency 20.70 % 21.70 % +1.00 pp for 66HPH-515M
Power density 207.4 Wp/m² 217.0 Wp/m² +9.6 Wp/m² for 66HPH-515M
Open-circuit voltage 37.15 V 46.00 V 8.85 V apart
Voltage at max power 31.18 V 38.83 V 7.65 V apart
Short-circuit current 13.78 A 14.13 A Effectively the same
Current at max power 12.99 A 13.27 A Effectively the same
Temperature
Temperature coefficient -0.340 %/°C -0.340 %/°C Same
Mechanical
Dimensions 1722x1134x30 mm 2093x1134x35 mm 1722x1134x30 mm vs 2093x1134x35 mm
Module area 1.953 m² 2.373 m² 0.421 m² apart
Weight 21.5 kg 25.3 kg -3.8 kg for 54HIB-405M
Weight per kWp 53.1 kg/kWp 49.1 kg/kWp -4.0 kg/kWp for 66HPH-515M
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 108 132 24 cells apart
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#10,764 vs #7,421
66HPH-515M leads by 3,343 places
Power density
#10,626 vs #7,426
66HPH-515M leads by 3,200 places
Heat behaviour
#8,778 vs #8,778
Tied - the same position in the database
Weight
#6,847 vs #2,764
66HPH-515M leads by 4,083 places
Warranty
#9,798 vs #9,798
Tied - the same position in the database
Overall
#11,948 vs #8,762
66HPH-515M leads by 3,186 places
05

More useful comparisons

Open the full database
Same series, other bin
Longi Solar LR5-54HIB-405M vs Longi Solar LR5-72HPH-565M
10 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR5-54HIB-405M vs Longi Solar LR5-72HPH-560M
10 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR5-54HIB-405M vs Longi Solar LR5-72HPH-555M
10 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR5-54HIB-405M vs Longi Solar LR5-72HPH-550M
10 differences, the largest is rated power
Same series, other bin
Longi Solar LR5-54HIB-405M vs Longi Solar LR5-72HPH-545M
10 differences, the largest is rated power
Same series, other bin
Longi Solar LR5-54HIB-405M vs Longi Solar LR5-66HPH-510M
10 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR5-54HIB-405M or Longi Solar LR5-66HPH-515M?
According to our database: Longi Solar LR5-66HPH-515M has higher module efficiency (21.70% vs 20.70%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR5-54HIB-405M and Longi Solar LR5-66HPH-515M?
Longi Solar LR5-54HIB-405M has a module efficiency of 20.70%, while Longi Solar LR5-66HPH-515M is 21.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR5-54HIB-405M use vs Longi Solar LR5-66HPH-515M?
Longi Solar LR5-54HIB-405M uses PERC cells; Longi Solar LR5-66HPH-515M uses Monocrystalline. 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 LR5-54HIB-405M and Longi Solar LR5-66HPH-515M?
Longi Solar LR5-54HIB-405M has a 25 years power warranty; Longi Solar LR5-66HPH-515M 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 177 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.