Luxen Solar Energy LNCU-635N vs Luxen Solar Energy LNCU-640N
VS
The verdict
Identical on every published parameter
All 19 comparable parameters agree. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from.
How alike are they
19
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
0 of 19 parameters
What actually differs
Every comparable parameter agrees. The full specification is below.
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.
635N
21,306 kWh
640N
21,473 kWh
Lifetime gap
167 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
635N
640N
Standard test conditions
25 °C
100.0% of rated power
635 W
640 W
Cool, bright day
40 °C
95.7% of rated power
607 W
612 W
Typical summer roof
55 °C
91.3% of rated power
580 W
584 W
Hot roof
70 °C
87.0% of rated power
552 W
556 W
03
Full specification
Parameter
635N
640N
Difference
Power and efficiency
Rated power
635 Wp
640 Wp
Effectively the same
Module efficiency
22.72 %
22.90 %
Effectively the same
Power density
227.2 Wp/m²
229.0 Wp/m²
Effectively the same
Open-circuit voltage
52.54 V
52.73 V
Effectively the same
Voltage at max power
43.88 V
44.05 V
Effectively the same
Short-circuit current
15.34 A
15.40 A
Effectively the same
Current at max power
14.47 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
46.9 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
14,129 panels
Against the whole database
Efficiency
#3,302
vs
#2,412
640N leads by 890 places
Power density
#3,309
vs
#2,443
640N leads by 866 places
Heat behaviour
#2,220
vs
#2,220
Tied - the same position in the database
Weight
#1,405
vs
#1,230
640N leads by 175 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,350
vs
#1,163
640N leads by 187 places
05
Open the full database
More useful comparisons
Same series, other bin
Luxen Solar Energy
Luxen Solar Energy LNCU-635N vs Luxen Solar Energy LNCU-630N
The same specification on paper
Same series, other bin
Luxen Solar Energy
Luxen Solar Energy LNCU-635N vs Luxen Solar Energy LNCU-625N
3 differences, the largest is module efficiency
Same series, other bin
Luxen Solar Energy
Luxen Solar Energy LNCU-635N vs Luxen Solar Energy LNCU-620N
3 differences, the largest is module efficiency
Same series, other bin
Luxen Solar Energy
Luxen Solar Energy LNCU-635N vs Luxen Solar Energy LNVU-590N
6 differences, the largest is rated power
Same series, other bin
Luxen Solar Energy
Luxen Solar Energy LNCU-635N vs Luxen Solar Energy LNVU-585N
6 differences, the largest is rated power
Same series, other bin
Luxen Solar Energy
Luxen Solar Energy LNCU-635N vs Luxen Solar Energy LNVU-580N
7 differences, the largest is rated power
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: Luxen Solar Energy LNCU-635N or Luxen Solar Energy LNCU-640N?
According to our database: Luxen Solar Energy LNCU-640N has higher module efficiency (22.90% vs 22.72%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Luxen Solar Energy LNCU-635N and Luxen Solar Energy LNCU-640N?
Luxen Solar Energy LNCU-635N has a module efficiency of 22.72%, 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-635N use vs Luxen Solar Energy LNCU-640N?
Luxen Solar Energy LNCU-635N 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-635N and Luxen Solar Energy LNCU-640N?
Luxen Solar Energy LNCU-635N 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.