Longi Solar LR7-72HVDF-640M vs Longi Solar LR7-72HVDF-650M
VS
The verdict
650M leads on the differences that matter
The largest is module efficiency: 0.40 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
640M
650M
Difference
Module efficiency
23.70 %
24.10 %
0.40 pp more efficient
Power density
236.9 Wp/m²
240.6 Wp/m²
3.7 Wp/m² higher
Rated power
640 Wp
650 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 (-0.260 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
640M
21,640 kWh
650M
21,978 kWh
Lifetime gap
338 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
640M
650M
Standard test conditions
25 °C
100.0% of rated power
640 W
650 W
Cool, bright day
40 °C
96.1% of rated power
615 W
625 W
Typical summer roof
55 °C
92.2% of rated power
590 W
599 W
Hot roof
70 °C
88.3% of rated power
565 W
574 W
03
Full specification
Parameter
640M
650M
Difference
Power and efficiency
Rated power
640 Wp
650 Wp
+10 W for 650M
Module efficiency
23.70 %
24.10 %
+0.40 pp for 650M
Power density
236.9 Wp/m²
240.6 Wp/m²
+3.7 Wp/m² for 650M
Open-circuit voltage
54.02 V
54.22 V
Effectively the same
Voltage at max power
44.67 V
44.87 V
Effectively the same
Short-circuit current
14.98 A
15.14 A
Effectively the same
Current at max power
14.33 A
14.49 A
Effectively the same
Temperature
Temperature coefficient
-0.260 %/°C
-0.260 %/°C
Same
Mechanical
Dimensions
2382x1134x30 mm
2382x1134x30 mm
Same
Module area
2.701 m²
2.701 m²
Same
Weight
33.5 kg
33.5 kg
Same
Weight per kWp
52.3 kg/kWp
51.5 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
144
144
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#517
vs
#219
650M leads by 298 places
Power density
#521
vs
#233
650M leads by 288 places
Heat behaviour
#511
vs
#511
Tied - the same position in the database
Weight
#5,829
vs
#4,914
650M leads by 915 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,271
vs
#891
650M leads by 380 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: Longi Solar LR7-72HVDF-640M or Longi Solar LR7-72HVDF-650M?
According to our database: Longi Solar LR7-72HVDF-650M has higher module efficiency (24.10% vs 23.70%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR7-72HVDF-640M and Longi Solar LR7-72HVDF-650M?
Longi Solar LR7-72HVDF-640M has a module efficiency of 23.70%, while Longi Solar LR7-72HVDF-650M is 24.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR7-72HVDF-640M use vs Longi Solar LR7-72HVDF-650M?
Longi Solar LR7-72HVDF-640M uses N-type cells; Longi Solar LR7-72HVDF-650M 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 LR7-72HVDF-640M and Longi Solar LR7-72HVDF-650M?
Longi Solar LR7-72HVDF-640M has a 30 years power warranty; Longi Solar LR7-72HVDF-650M 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 LR7-72HVDF-640M and Longi Solar LR7-72HVDF-650M bifacial panels?
Both Longi Solar LR7-72HVDF-640M and Longi Solar LR7-72HVDF-650M 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.