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620N vs 640N 16 of 19 identical Swap Change panels

Luxen Solar Energy LNCU-620N vs Luxen Solar Energy LNCU-640N

Luxen Solar Energy LNCU-620N
Luxen Solar Energy
LNCU-620N
620 Wp 22.18 % N-type
Open panel page Datasheet PDF
VS
Luxen Solar Energy LNCU-640N
Luxen Solar Energy
LNCU-640N
640 Wp 22.90 % N-type
Open panel page Datasheet PDF
The verdict

640N leads on the differences that matter

The largest is module efficiency: 0.72 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 620N 640N Difference
Module efficiency 22.18 % 22.90 % 0.72 pp more efficient
Power density 221.8 Wp/m² 229.0 Wp/m² 7.2 Wp/m² higher
Rated power 620 Wp 640 Wp 20 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 (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
620N
20,802 kWh
640N
21,473 kWh
Lifetime gap
671 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 620N 640N
Standard test conditions 25 °C 100.0% of rated power 620 W 640 W
Cool, bright day 40 °C 95.7% of rated power 593 W 612 W
Typical summer roof 55 °C 91.3% of rated power 566 W 584 W
Hot roof 70 °C 87.0% of rated power 539 W 556 W
03

Full specification

Parameter 620N 640N Difference
Power and efficiency
Rated power 620 Wp 640 Wp +20 W for 640N
Module efficiency 22.18 % 22.90 % +0.72 pp for 640N
Power density 221.8 Wp/m² 229.0 Wp/m² +7.2 Wp/m² for 640N
Open-circuit voltage 51.98 V 52.73 V Effectively the same
Voltage at max power 43.39 V 44.05 V Effectively the same
Short-circuit current 15.16 A 15.40 A Effectively the same
Current at max power 14.29 A 14.53 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2465x1134x33 mm 2465x1134x33 mm Same
Module area 2.795 m² 2.795 m² Same
Weight 29.8 kg 29.8 kg Same
Weight per kWp 48.1 kg/kWp 46.6 kg/kWp Effectively the same
Warranty and degradation
Product warranty 20 yrs 20 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology N-type N-type Same
Cell type Monocrystalline Monocrystalline Same
Cell count 144 144 Same
Bifacial No No Same
04

Against the whole database

14,129 panels
Efficiency
#5,994 vs #2,412
640N leads by 3,582 places
Power density
#5,933 vs #2,443
640N leads by 3,490 places
Heat behaviour
#2,220 vs #2,220
Tied - the same position in the database
Weight
#2,045 vs #1,230
640N leads by 815 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,976 vs #1,163
640N leads by 813 places
05

More useful comparisons

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Luxen Solar Energy LNCU-620N vs Luxen Solar Energy LNCU-625N
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Luxen Solar Energy LNCU-620N vs Luxen Solar Energy LNVU-585N
8 differences, the largest is rated power
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Luxen Solar Energy LNCU-620N vs Luxen Solar Energy LNVU-580N
7 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Luxen Solar Energy LNCU-620N or Luxen Solar Energy LNCU-640N?
According to our database: Luxen Solar Energy LNCU-640N has higher module efficiency (22.90% vs 22.18%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Luxen Solar Energy LNCU-620N and Luxen Solar Energy LNCU-640N?
Luxen Solar Energy LNCU-620N has a module efficiency of 22.18%, while Luxen Solar Energy LNCU-640N is 22.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Luxen Solar Energy LNCU-620N use vs Luxen Solar Energy LNCU-640N?
Luxen Solar Energy LNCU-620N uses N-type cells; Luxen Solar Energy LNCU-640N 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 Luxen Solar Energy LNCU-620N and Luxen Solar Energy LNCU-640N?
Luxen Solar Energy LNCU-620N has a 30 years power warranty; Luxen Solar Energy LNCU-640N 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 3 Luxen Solar Energy 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.