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550M vs 555M 18 of 19 identical Swap Change panels

Longi Solar LR5-72HPH-550M vs Longi Solar LR5-72HPH-555M

Longi Solar LR5-72HPH-550M
LR5-72HPH-550M
550 Wp 21.30 % PERC
Open panel page Datasheet PDF
VS
Longi Solar LR5-72HPH-555M
LR5-72HPH-555M
555 Wp 21.50 % PERC
Open panel page Datasheet PDF
The verdict

555M leads on the differences that matter

The largest is module efficiency: 0.20 pp more efficient. 18 of 19 comparable parameters are identical.

See the one difference
How alike are they
18 of 19 comparable
parameters are identical
identical differs
01

What actually differs

1 of 19 parameters
Parameter 550M 555M Difference
Module efficiency 21.30 % 21.50 % 0.20 pp more efficient
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.
550M
17,825 kWh
555M
17,987 kWh
Lifetime gap
162 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 550M 555M
Standard test conditions 25 °C 100.0% of rated power 550 W 555 W
Cool, bright day 40 °C 94.9% of rated power 522 W 527 W
Typical summer roof 55 °C 89.8% of rated power 494 W 498 W
Hot roof 70 °C 84.7% of rated power 466 W 470 W
03

Full specification

Parameter 550M 555M Difference
Power and efficiency
Rated power 550 Wp 555 Wp Effectively the same
Module efficiency 21.30 % 21.50 % +0.20 pp for 555M
Power density 212.9 Wp/m² 214.8 Wp/m² Effectively the same
Open-circuit voltage 49.80 V 49.95 V Effectively the same
Voltage at max power 41.95 V 42.10 V Effectively the same
Short-circuit current 13.98 A 14.04 A Effectively the same
Current at max power 13.12 A 13.19 A Effectively the same
Temperature
Temperature coefficient -0.340 %/°C -0.340 %/°C Same
Mechanical
Dimensions 2278x1134x35 mm 2278x1134x35 mm Same
Module area 2.583 m² 2.583 m² Same
Weight 27.5 kg 27.5 kg Same
Weight per kWp 50.0 kg/kWp 49.5 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 144 144 Same
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#8,519 vs #7,958
555M leads by 561 places
Power density
#8,497 vs #8,034
555M leads by 463 places
Heat behaviour
#8,778 vs #8,778
Tied - the same position in the database
Weight
#3,298 vs #3,116
555M leads by 182 places
Warranty
#9,798 vs #9,798
Tied - the same position in the database
Overall
#8,006 vs #7,542
555M leads by 464 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-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
Same series, other bin
Longi Solar LR5-72HPH-550M vs Longi Solar LR5-54HPH-425M
9 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 LR5-72HPH-555M?
According to our database: Longi Solar LR5-72HPH-555M has higher module efficiency (21.50% vs 21.30%). 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 LR5-72HPH-555M?
Longi Solar LR5-72HPH-550M has a module efficiency of 21.30%, while Longi Solar LR5-72HPH-555M is 21.50%. 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 LR5-72HPH-555M?
Longi Solar LR5-72HPH-550M uses PERC cells; Longi Solar LR5-72HPH-555M 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 LR5-72HPH-555M?
Longi Solar LR5-72HPH-550M has a 25 years power warranty; Longi Solar LR5-72HPH-555M 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.