Longi Solar LR5-66HPH-515M vs Longi Solar LR5-66HPH-510M
VS
The verdict
515M leads on the differences that matter
The largest is module efficiency: 0.20 pp more efficient. 17 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See the one differenceHow alike are they
17
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
1 of 18 parameters
What actually differs
Parameter
515M
510M
Difference
Module efficiency
21.70 %
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.
515M
16,691 kWh
510M
16,529 kWh
Lifetime gap
162 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
515M
510M
Standard test conditions
25 °C
100.0% of rated power
515 W
510 W
Cool, bright day
40 °C
94.9% of rated power
489 W
484 W
Typical summer roof
55 °C
89.8% of rated power
462 W
458 W
Hot roof
70 °C
84.7% of rated power
436 W
432 W
03
Full specification
Parameter
515M
510M
Difference
Power and efficiency
Rated power
515 Wp
510 Wp
Effectively the same
Module efficiency
21.70 %
21.50 %
+0.20 pp for 515M
Power density
217.0 Wp/m²
214.9 Wp/m²
Effectively the same
Open-circuit voltage
46.00 V
45.85 V
Effectively the same
Voltage at max power
38.83 V
38.68 V
Effectively the same
Short-circuit current
14.13 A
14.05 A
Effectively the same
Current at max power
13.27 A
13.19 A
Effectively the same
Temperature
Temperature coefficient
-0.340 %/°C
-0.340 %/°C
Same
Mechanical
Dimensions
2093x1134x35 mm
2093x1134x35 mm
Same
Module area
2.373 m²
2.373 m²
Same
Weight
25.3 kg
25.3 kg
Same
Weight per kWp
49.1 kg/kWp
49.6 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
-
-
Neither datasheet publishes this
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
132
Same
Bifacial
No
No
Same
04
14,005 panels
Against the whole database
Efficiency
#7,421
vs
#7,958
515M leads by 537 places
Power density
#7,426
vs
#8,033
515M leads by 607 places
Heat behaviour
#8,778
vs
#8,778
Tied - the same position in the database
Weight
#2,764
vs
#3,154
515M leads by 390 places
Warranty
#9,798
vs
#9,798
Tied - the same position in the database
Overall
#8,762
vs
#9,133
515M leads by 371 places
05
Open the full database
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Longi Solar LR5-66HPH-515M vs Longi Solar LR5-72HPH-555M
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Longi Solar LR5-66HPH-515M vs Longi Solar LR5-72HPH-550M
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06
Written summary
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07
Questions about this pairing
Which panel is better: Longi Solar LR5-66HPH-515M or Longi Solar LR5-66HPH-510M?
According to our database: Longi Solar LR5-66HPH-515M has higher module efficiency (21.70% vs 21.50%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR5-66HPH-515M and Longi Solar LR5-66HPH-510M?
Longi Solar LR5-66HPH-515M has a module efficiency of 21.70%, while Longi Solar LR5-66HPH-510M is 21.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR5-66HPH-515M use vs Longi Solar LR5-66HPH-510M?
Longi Solar LR5-66HPH-515M uses Monocrystalline cells; Longi Solar LR5-66HPH-510M 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 LR5-66HPH-515M and Longi Solar LR5-66HPH-510M?
Longi Solar LR5-66HPH-515M has a 25 years power warranty; Longi Solar LR5-66HPH-510M 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.