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505M vs 510M 18 of 19 identical Swap Change panels

Longi Solar LR7-54HJD-505M vs Longi Solar LR7-54HJD-510M

Longi Solar LR7-54HJD-505M
LR7-54HJD-505M
505 Wp 24.70 % Back Contact Bifacial
Open panel page Datasheet PDF
VS
Longi Solar LR7-54HJD-510M
LR7-54HJD-510M
510 Wp 25.00 % Back Contact Bifacial
Open panel page Datasheet PDF
The verdict

510M leads on the differences that matter

The largest is module efficiency: 0.30 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 505M 510M Difference
Module efficiency 24.70 % 25.00 % 0.30 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 (-0.240 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
505M
17,076 kWh
510M
17,245 kWh
Lifetime gap
169 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 505M 510M
Standard test conditions 25 °C 100.0% of rated power 505 W 510 W
Cool, bright day 40 °C 96.4% of rated power 487 W 492 W
Typical summer roof 55 °C 92.8% of rated power 469 W 473 W
Hot roof 70 °C 89.2% of rated power 450 W 455 W
03

Full specification

Parameter 505M 510M Difference
Power and efficiency
Rated power 505 Wp 510 Wp Effectively the same
Module efficiency 24.70 % 25.00 % +0.30 pp for 510M
Power density 247.4 Wp/m² 249.9 Wp/m² Effectively the same
Open-circuit voltage 41.45 V 41.55 V Effectively the same
Voltage at max power 34.27 V 34.37 V Effectively the same
Short-circuit current 15.41 A 15.52 A Effectively the same
Current at max power 14.74 A 14.84 A Effectively the same
Temperature
Temperature coefficient -0.240 %/°C -0.240 %/°C Same
Mechanical
Dimensions 1800x1134x30 mm 1800x1134x30 mm Same
Module area 2.041 m² 2.041 m² Same
Weight 23.5 kg 23.5 kg Same
Weight per kWp 46.5 kg/kWp 46.1 kg/kWp Effectively the same
Warranty and degradation
Product warranty 30 yrs 30 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.35 %/yr 0.35 %/yr Same
Technology
Cell technology Back Contact Back Contact Same
Cell type Monocrystalline Monocrystalline Same
Cell count 108 108 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#39 vs #4
510M leads by 35 places
Power density
#39 vs #7
510M leads by 32 places
Heat behaviour
#13 vs #13
Tied - the same position in the database
Weight
#1,199 vs #979
510M leads by 220 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,425 vs #1,144
510M leads by 281 places
05

More useful comparisons

Open the full database
Same series, other bin
Longi Solar LR7-54HJD-505M vs Longi Solar LR7-54HJD-500M
One difference: module efficiency
Same series, other bin
Longi Solar LR7-54HJD-505M vs Longi Solar LR7-54HJD-495M
3 differences, the largest is module efficiency
Same manufacturer
Longi Solar LR7-54HJD-505M vs Longi Solar LR7-72HVHF-670M
12 differences, the largest is rated power
Same manufacturer
Longi Solar LR7-54HJD-505M vs Longi Solar LR8-66HYD-670M
12 differences, the largest is rated power
Same manufacturer
Longi Solar LR7-54HJD-505M vs Longi Solar LR7-72HVH-670M
12 differences, the largest is rated power
Same manufacturer
Longi Solar LR7-54HJD-505M vs Longi Solar LR7-72HVHF-665M
12 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR7-54HJD-505M or Longi Solar LR7-54HJD-510M?
According to our database: Longi Solar LR7-54HJD-510M has higher module efficiency (25.00% vs 24.70%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR7-54HJD-505M and Longi Solar LR7-54HJD-510M?
Longi Solar LR7-54HJD-505M has a module efficiency of 24.70%, while Longi Solar LR7-54HJD-510M is 25.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR7-54HJD-505M use vs Longi Solar LR7-54HJD-510M?
Longi Solar LR7-54HJD-505M uses Back Contact cells; Longi Solar LR7-54HJD-510M uses Back Contact. 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 LR7-54HJD-505M and Longi Solar LR7-54HJD-510M?
Longi Solar LR7-54HJD-505M has a 30 years power warranty; Longi Solar LR7-54HJD-510M has a 30 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.
Are Longi Solar LR7-54HJD-505M and Longi Solar LR7-54HJD-510M bifacial panels?
Both Longi Solar LR7-54HJD-505M and Longi Solar LR7-54HJD-510M are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.

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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.