Longi Solar LR7-60HVHL-560M vs Longi Solar LR8-66HVD-645M
VS
The verdict
LR7-60HVHL-560M leads on the differences that matter
The largest is module efficiency: 0.92 pp more efficient. 6 of 19 comparable parameters are identical.
See all 13 differencesHow alike are they
6
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
13 of 19 parameters
What actually differs
Parameter
LR7-60HVHL-560M
LR8-66HVD-645M
Difference
Module efficiency
24.80 %
23.88 %
0.92 pp more efficient
Rated power
560 Wp
645 Wp
85 W more power
Power density
248.2 Wp/m²
238.8 Wp/m²
9.4 Wp/m² higher
Weight
16.3 kg
33.5 kg
17.2 kg lighter
Weight per kWp
29.1 kg/kWp
51.9 kg/kWp
22.8 kg/kWp lighter
Open-circuit voltage
45.28 V
49.62 V
4.34 V apart
Module area
2.257 m²
2.701 m²
0.445 m² apart
Cell count
120
132
12 cells apart
Voltage at max power
37.51 V
40.88 V
3.37 V apart
Short-circuit current
15.65 A
16.46 A
0.81 A apart
Bifacial
No
Yes
No vs Yes
Dimensions
1990x1134x30 mm
2382x1134x30 mm
1990x1134x30 mm vs 2382x1134x30 mm
Current at max power
14.93 A
15.78 A
0.85 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
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.
LR7-60HVHL-560M
18,935 kWh
LR8-66HVD-645M
21,809 kWh
Lifetime gap
2,874 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
LR7-60HVHL-560M
LR8-66HVD-645M
Standard test conditions
25 °C
100.0% of rated power
560 W
645 W
Cool, bright day
40 °C
96.1% of rated power
538 W
620 W
Typical summer roof
55 °C
92.2% of rated power
516 W
595 W
Hot roof
70 °C
88.3% of rated power
494 W
570 W
03
Full specification
Parameter
LR7-60HVHL-560M
LR8-66HVD-645M
Difference
Power and efficiency
Rated power
560 Wp
645 Wp
+85 W for LR8-66HVD-645M
Module efficiency
24.80 %
23.88 %
+0.92 pp for LR7-60HVHL-560M
Power density
248.2 Wp/m²
238.8 Wp/m²
+9.4 Wp/m² for LR7-60HVHL-560M
Open-circuit voltage
45.28 V
49.62 V
4.34 V apart
Voltage at max power
37.51 V
40.88 V
3.37 V apart
Short-circuit current
15.65 A
16.46 A
0.81 A apart
Current at max power
14.93 A
15.78 A
0.85 A apart
Temperature
Temperature coefficient
-0.260 %/°C
-0.260 %/°C
Same
Mechanical
Dimensions
1990x1134x30 mm
2382x1134x30 mm
1990x1134x30 mm vs 2382x1134x30 mm
Module area
2.257 m²
2.701 m²
0.445 m² apart
Weight
16.3 kg
33.5 kg
-17.2 kg for LR7-60HVHL-560M
Weight per kWp
29.1 kg/kWp
51.9 kg/kWp
-22.8 kg/kWp for LR7-60HVHL-560M
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
Back Contact
Back Contact
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
120
132
12 cells apart
Bifacial
No
Yes
No vs Yes
04
14,005 panels
Against the whole database
Efficiency
#12
vs
#394
LR7-60HVHL-560M leads by 382 places
Power density
#12
vs
#356
LR7-60HVHL-560M leads by 344 places
Heat behaviour
#511
vs
#511
Tied - the same position in the database
Weight
#130
vs
#5,361
LR7-60HVHL-560M leads by 5,231 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,683
vs
#1,084
LR8-66HVD-645M leads by 599 places
05
Open the full database
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06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: Longi Solar LR7-60HVHL-560M or Longi Solar LR8-66HVD-645M?
According to our database: Longi Solar LR7-60HVHL-560M has higher module efficiency (24.80% vs 23.88%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR7-60HVHL-560M and Longi Solar LR8-66HVD-645M?
Longi Solar LR7-60HVHL-560M has a module efficiency of 24.80%, while Longi Solar LR8-66HVD-645M is 23.88%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR7-60HVHL-560M use vs Longi Solar LR8-66HVD-645M?
Longi Solar LR7-60HVHL-560M uses Back Contact cells; Longi Solar LR8-66HVD-645M 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 LR7-60HVHL-560M and Longi Solar LR8-66HVD-645M?
Longi Solar LR7-60HVHL-560M has a 30 years power warranty; Longi Solar LR8-66HVD-645M 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 LR7-60HVHL-560M and Longi Solar LR8-66HVD-645M bifacial panels?
Longi Solar LR8-66HVD-645M is bifacial (captures light from both faces); Longi Solar LR7-60HVHL-560M is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Shop prices: See 174 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.