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510M vs 500M 16 of 19 identical Swap Change panels

Longi Solar LR7-54HJD-510M vs Longi Solar LR7-54HJD-500M

Longi Solar LR7-54HJD-510M
LR7-54HJD-510M
510 Wp 25.00 % Back Contact Bifacial
Open panel page Datasheet PDF
VS
Longi Solar LR7-54HJD-500M
LR7-54HJD-500M
500 Wp 24.50 % Back Contact Bifacial
Open panel page Datasheet PDF
The verdict

510M leads on the differences that matter

The largest is module efficiency: 0.50 pp more efficient. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter 510M 500M Difference
Module efficiency 25.00 % 24.50 % 0.50 pp more efficient
Power density 249.9 Wp/m² 245.0 Wp/m² 4.9 Wp/m² higher
Rated power 510 Wp 500 Wp 10 W more power
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.
510M
17,245 kWh
500M
16,907 kWh
Lifetime gap
338 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 510M 500M
Standard test conditions 25 °C 100.0% of rated power 510 W 500 W
Cool, bright day 40 °C 96.4% of rated power 492 W 482 W
Typical summer roof 55 °C 92.8% of rated power 473 W 464 W
Hot roof 70 °C 89.2% of rated power 455 W 446 W
03

Full specification

Parameter 510M 500M Difference
Power and efficiency
Rated power 510 Wp 500 Wp +10 W for 510M
Module efficiency 25.00 % 24.50 % +0.50 pp for 510M
Power density 249.9 Wp/m² 245.0 Wp/m² +4.9 Wp/m² for 510M
Open-circuit voltage 41.55 V 41.35 V Effectively the same
Voltage at max power 34.37 V 34.17 V Effectively the same
Short-circuit current 15.52 A 15.30 A Effectively the same
Current at max power 14.84 A 14.63 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 46.1 kg/kWp 47.0 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
#4 vs #74
510M leads by 70 places
Power density
#7 vs #77
510M leads by 70 places
Heat behaviour
#13 vs #13
Tied - the same position in the database
Weight
#979 vs #1,450
510M leads by 471 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,144 vs #1,611
510M leads by 467 places
05

More useful comparisons

Open the full database
Same series, other bin
Longi Solar LR7-54HJD-510M vs Longi Solar LR7-54HJD-505M
One difference: module efficiency
Same series, other bin
Longi Solar LR7-54HJD-510M vs Longi Solar LR7-54HJD-495M
3 differences, the largest is module efficiency
Same manufacturer
Longi Solar LR7-54HJD-510M vs Longi Solar LR7-72HVHF-670M
13 differences, the largest is rated power
Same manufacturer
Longi Solar LR7-54HJD-510M vs Longi Solar LR8-66HYD-670M
13 differences, the largest is rated power
Same manufacturer
Longi Solar LR7-54HJD-510M vs Longi Solar LR7-72HVH-670M
13 differences, the largest is rated power
Same manufacturer
Longi Solar LR7-54HJD-510M vs Longi Solar LR7-72HVHF-665M
14 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR7-54HJD-510M or Longi Solar LR7-54HJD-500M?
According to our database: Longi Solar LR7-54HJD-510M has higher module efficiency (25.00% vs 24.50%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR7-54HJD-510M and Longi Solar LR7-54HJD-500M?
Longi Solar LR7-54HJD-510M has a module efficiency of 25.00%, while Longi Solar LR7-54HJD-500M is 24.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR7-54HJD-510M use vs Longi Solar LR7-54HJD-500M?
Longi Solar LR7-54HJD-510M uses Back Contact cells; Longi Solar LR7-54HJD-500M 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-510M and Longi Solar LR7-54HJD-500M?
Longi Solar LR7-54HJD-510M has a 30 years power warranty; Longi Solar LR7-54HJD-500M 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-510M and Longi Solar LR7-54HJD-500M bifacial panels?
Both Longi Solar LR7-54HJD-510M and Longi Solar LR7-54HJD-500M 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.