Longi Solar LR8-66HGD-620M vs Leapton LP182*199-M-66-NB 590W
VS
The verdict
LR8-66HGD-620M leads on the differences that matter
The largest is rated power: 30 W more power. 11 of 19 comparable parameters are identical.
See all 8 differencesHow alike are they
11
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
8 of 19 parameters
What actually differs
Parameter
LR8-66HGD-620M
LP182*199-M-66-NB 590W
Difference
Rated power
620 Wp
590 Wp
30 W more power
Product warranty
12 yrs
25 yrs
13 yrs longer
Temperature coefficient
-0.280 %/°C
-0.300 %/°C
0.020 %/°C better in heat
Module area
2.701 m²
2.584 m²
0.117 m² apart
Cell technology
Back Contact
TOPCon
Back Contact vs TOPCon
Short-circuit current
16.05 A
15.32 A
0.73 A apart
Dimensions
2382x1134x30 mm
2279x1134x30 mm
2382x1134x30 mm vs 2279x1134x30 mm
Current at max power
15.16 A
14.49 A
0.67 A apart
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
LR8-66HGD-620M
20,802 kWh
LP182*199-M-66-NB 590W
19,796 kWh
Lifetime gap
1,006 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
LR8-66HGD-620M
LP182*199-M-66-NB 590W
Standard test conditions
25 °C
100.0% of rated power
620 W
590 W
Cool, bright day
40 °C
95.5% of rated power
594 W
563 W
Typical summer roof
55 °C
91.0% of rated power
568 W
537 W
Hot roof
70 °C
86.5% of rated power
542 W
510 W
03
Full specification
Parameter
LR8-66HGD-620M
LP182*199-M-66-NB 590W
Difference
Power and efficiency
Rated power
620 Wp
590 Wp
+30 W for LR8-66HGD-620M
Module efficiency
23.00 %
22.83 %
Effectively the same
Power density
229.5 Wp/m²
228.3 Wp/m²
Effectively the same
Open-circuit voltage
48.78 V
48.62 V
Effectively the same
Voltage at max power
40.91 V
40.72 V
Effectively the same
Short-circuit current
16.05 A
15.32 A
0.73 A apart
Current at max power
15.16 A
14.49 A
0.67 A apart
Temperature
Temperature coefficient
-0.280 %/°C
-0.300 %/°C
+0.020 %/°C for LR8-66HGD-620M
Mechanical
Dimensions
2382x1134x30 mm
2279x1134x30 mm
2382x1134x30 mm vs 2279x1134x30 mm
Module area
2.701 m²
2.584 m²
0.117 m² apart
Weight
32.5 kg
32.0 kg
Effectively the same
Weight per kWp
52.4 kg/kWp
54.2 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
12 yrs
25 yrs
+13 yrs for LP182*199-M-66-NB 590W
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.40 %/yr
0.40 %/yr
Same
Technology
Cell technology
Back Contact
TOPCon
Back Contact vs TOPCon
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
132
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#1,919
vs
#2,683
LR8-66HGD-620M leads by 764 places
Power density
#2,191
vs
#2,731
LR8-66HGD-620M leads by 540 places
Heat behaviour
#1,309
vs
#6,093
LR8-66HGD-620M leads by 4,784 places
Weight
#5,893
vs
#8,477
LR8-66HGD-620M leads by 2,584 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#2,525
vs
#1,591
LP182*199-M-66-NB 590W leads by 934 places
05
Open the full database
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6 differences, the largest is module efficiency
06
Written summary
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07
Questions about this pairing
Which panel is better: Longi Solar LR8-66HGD-620M or Leapton LP182*199-M-66-NB 590W?
According to our database: Longi Solar LR8-66HGD-620M has higher module efficiency (23.00% vs 22.83%); Longi Solar LR8-66HGD-620M tolerates heat better (temp coeff -0.280%/°C vs -0.300%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR8-66HGD-620M and Leapton LP182*199-M-66-NB 590W?
Longi Solar LR8-66HGD-620M has a module efficiency of 23.00%, while Leapton LP182*199-M-66-NB 590 W is 22.83%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR8-66HGD-620M use vs Leapton LP182*199-M-66-NB 590W?
Longi Solar LR8-66HGD-620M uses Back Contact cells; Leapton LP182*199-M-66-NB 590 W uses TOPCon. 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 LR8-66HGD-620M and Leapton LP182*199-M-66-NB 590W?
Longi Solar LR8-66HGD-620M has a 30 years power warranty; Leapton LP182*199-M-66-NB 590 W 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 LR8-66HGD-620M and Leapton LP182*199-M-66-NB 590W bifacial panels?
Both Longi Solar LR8-66HGD-620M and Leapton LP182*199-M-66-NB 590 W 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.
Shop prices: See 147 Longi Solar offers · See 5 Leapton 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.