Longi Solar LR7-60HVH-540M vs Longi Solar LR7-60HVH-555M
VS
The verdict
555M leads on the differences that matter
The largest is module efficiency: 0.70 pp more efficient. 16 of 19 comparable parameters are identical.
See all 3 differencesHow alike are they
16
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
3 of 19 parameters
What actually differs
Parameter
540M
555M
Difference
Module efficiency
23.90 %
24.60 %
0.70 pp more efficient
Power density
239.3 Wp/m²
245.9 Wp/m²
6.6 Wp/m² higher
Rated power
540 Wp
555 Wp
15 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 (-0.260 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
540M
18,259 kWh
555M
18,766 kWh
Lifetime gap
507 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
540M
555M
Standard test conditions
25 °C
100.0% of rated power
540 W
555 W
Cool, bright day
40 °C
96.1% of rated power
519 W
533 W
Typical summer roof
55 °C
92.2% of rated power
498 W
512 W
Hot roof
70 °C
88.3% of rated power
477 W
490 W
03
Full specification
Parameter
540M
555M
Difference
Power and efficiency
Rated power
540 Wp
555 Wp
+15 W for 555M
Module efficiency
23.90 %
24.60 %
+0.70 pp for 555M
Power density
239.3 Wp/m²
245.9 Wp/m²
+6.6 Wp/m² for 555M
Open-circuit voltage
44.88 V
45.18 V
Effectively the same
Voltage at max power
37.11 V
37.41 V
Effectively the same
Short-circuit current
15.25 A
15.55 A
Effectively the same
Current at max power
14.55 A
14.84 A
Effectively the same
Temperature
Temperature coefficient
-0.260 %/°C
-0.260 %/°C
Same
Mechanical
Dimensions
1990x1134x30 mm
1990x1134x30 mm
Same
Module area
2.257 m²
2.257 m²
Same
Weight
25.0 kg
25.0 kg
Same
Weight per kWp
46.3 kg/kWp
45.0 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
15 yrs
15 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.35 %/yr
0.35 %/yr
Same
Technology
Cell technology
N-type
N-type
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
120
120
Same
Bifacial
No
No
Same
04
14,005 panels
Against the whole database
Efficiency
#351
vs
#51
555M leads by 300 places
Power density
#353
vs
#70
555M leads by 283 places
Heat behaviour
#511
vs
#511
Tied - the same position in the database
Weight
#1,110
vs
#604
555M leads by 506 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#3,521
vs
#2,248
555M leads by 1,273 places
05
Open the full database
More useful comparisons
Same series, other bin
Longi Solar LR7-60HVH-540M vs Longi Solar LR7-60HVH-560M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-60HVH-540M vs Longi Solar LR7-60HVH-550M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-60HVH-540M vs Longi Solar LR7-60HVH-545M
One difference: module efficiency
Same series, other bin
Longi Solar LR7-60HVH-540M vs Longi Solar LR7-60HVH-535M
One difference: module efficiency
Same manufacturer
Longi Solar LR7-60HVH-540M vs Longi Solar LR7-72HVHF-670M
10 differences, the largest is module efficiency
Same manufacturer
Longi Solar LR7-60HVH-540M vs Longi Solar LR8-66HYD-670M
15 differences, the largest is module efficiency
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: Longi Solar LR7-60HVH-540M or Longi Solar LR7-60HVH-555M?
According to our database: Longi Solar LR7-60HVH-555M has higher module efficiency (24.60% vs 23.90%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR7-60HVH-540M and Longi Solar LR7-60HVH-555M?
Longi Solar LR7-60HVH-540M has a module efficiency of 23.90%, while Longi Solar LR7-60HVH-555M is 24.60%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR7-60HVH-540M use vs Longi Solar LR7-60HVH-555M?
Longi Solar LR7-60HVH-540M uses N-type cells; Longi Solar LR7-60HVH-555M uses N-type. 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 LR7-60HVH-540M and Longi Solar LR7-60HVH-555M?
Longi Solar LR7-60HVH-540M has a 30 years power warranty; Longi Solar LR7-60HVH-555M 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.
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.