Longi Solar LR7-72HVH-630M vs Longi Solar LR8-66HVD-665M
VS
The verdict
LR8-66HVD-665M leads on the differences that matter
The largest is module efficiency: 1.32 pp more efficient. 7 of 19 comparable parameters are identical.
See all 12 differencesHow alike are they
7
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
12 of 19 parameters
What actually differs
Parameter
LR7-72HVH-630M
LR8-66HVD-665M
Difference
Module efficiency
23.30 %
24.62 %
1.32 pp more efficient
Power density
233.2 Wp/m²
246.2 Wp/m²
13.0 Wp/m² higher
Rated power
630 Wp
665 Wp
35 W more power
Weight
28.5 kg
33.5 kg
5.0 kg lighter
Weight per kWp
45.2 kg/kWp
50.4 kg/kWp
5.1 kg/kWp lighter
Short-circuit current
14.97 A
16.78 A
1.81 A apart
Open-circuit voltage
53.50 V
50.02 V
3.48 V apart
Cell technology
N-type
Back Contact
N-type vs Back Contact
Cell count
144
132
12 cells apart
Current at max power
14.27 A
16.11 A
1.84 A apart
Bifacial
No
Yes
No vs Yes
Voltage at max power
44.16 V
41.28 V
2.88 V 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
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.
LR7-72HVH-630M
21,302 kWh
LR8-66HVD-665M
22,486 kWh
Lifetime gap
1,184 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
LR7-72HVH-630M
LR8-66HVD-665M
Standard test conditions
25 °C
100.0% of rated power
630 W
665 W
Cool, bright day
40 °C
96.1% of rated power
605 W
639 W
Typical summer roof
55 °C
92.2% of rated power
581 W
613 W
Hot roof
70 °C
88.3% of rated power
556 W
587 W
03
Full specification
Parameter
LR7-72HVH-630M
LR8-66HVD-665M
Difference
Power and efficiency
Rated power
630 Wp
665 Wp
+35 W for LR8-66HVD-665M
Module efficiency
23.30 %
24.62 %
+1.32 pp for LR8-66HVD-665M
Power density
233.2 Wp/m²
246.2 Wp/m²
+13.0 Wp/m² for LR8-66HVD-665M
Open-circuit voltage
53.50 V
50.02 V
3.48 V apart
Voltage at max power
44.16 V
41.28 V
2.88 V apart
Short-circuit current
14.97 A
16.78 A
1.81 A apart
Current at max power
14.27 A
16.11 A
1.84 A apart
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
28.5 kg
33.5 kg
-5.0 kg for LR7-72HVH-630M
Weight per kWp
45.2 kg/kWp
50.4 kg/kWp
-5.1 kg/kWp for LR7-72HVH-630M
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
Back Contact
N-type vs Back Contact
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
144
132
12 cells apart
Bifacial
No
Yes
No vs Yes
04
14,129 panels
Against the whole database
Efficiency
#1,057
vs
#47
LR8-66HVD-665M leads by 1,010 places
Power density
#1,042
vs
#47
LR8-66HVD-665M leads by 995 places
Heat behaviour
#515
vs
#515
Tied - the same position in the database
Weight
#655
vs
#3,759
LR7-72HVH-630M leads by 3,104 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,594
vs
#402
LR8-66HVD-665M leads by 1,192 places
05
Open the full database
More useful comparisons
Same series, other bin
Longi Solar LR7-72HVH-630M vs Longi Solar LR7-72HVH-635M
One difference: module efficiency
Same series, other bin
Longi Solar LR8-66HVD-665M vs Longi Solar LR8-66HVD-660M
The same specification on paper
Same series, other bin
Longi Solar LR8-66HVD-665M vs Longi Solar LR8-66HVD-655M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR8-66HVD-665M vs Longi Solar LR8-66HVD-650M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR8-66HVD-665M vs Longi Solar LR8-66HVD-645M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR8-66HVD-665M vs Longi Solar LR8-66HVD-640M
3 differences, the largest is module efficiency
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: Longi Solar LR7-72HVH-630M or Longi Solar LR8-66HVD-665M?
According to our database: Longi Solar LR8-66HVD-665M has higher module efficiency (24.62% vs 23.30%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR7-72HVH-630M and Longi Solar LR8-66HVD-665M?
Longi Solar LR7-72HVH-630M has a module efficiency of 23.30%, while Longi Solar LR8-66HVD-665M is 24.62%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR7-72HVH-630M use vs Longi Solar LR8-66HVD-665M?
Longi Solar LR7-72HVH-630M uses N-type cells; Longi Solar LR8-66HVD-665M uses Back Contact. 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 LR7-72HVH-630M and Longi Solar LR8-66HVD-665M?
Longi Solar LR7-72HVH-630M has a 30 years power warranty; Longi Solar LR8-66HVD-665M 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 LR7-72HVH-630M and Longi Solar LR8-66HVD-665M bifacial panels?
Longi Solar LR8-66HVD-665M is bifacial (captures light from both faces); Longi Solar LR7-72HVH-630M is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Shop prices: See 152 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.