Longi Solar LR5-72HTH-575M vs Longi Solar LR8-66HYD-670M
VS
The verdict
LR8-66HYD-670M leads on the differences that matter
The largest is module efficiency: 2.50 pp more efficient. 1 of 17 comparable parameters are identical, with 2 more left out because at least one datasheet does not publish them.
See all 16 differencesHow alike are they
1
of 17 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
16 of 17 parameters
What actually differs
Parameter
LR5-72HTH-575M
LR8-66HYD-670M
Difference
Module efficiency
22.30 %
24.80 %
2.50 pp more efficient
Rated power
575 Wp
670 Wp
95 W more power
Power density
222.6 Wp/m²
248.0 Wp/m²
25.5 Wp/m² higher
Performance warranty
25 yrs
30 yrs
5 yrs longer
Temperature coefficient
-0.290 %/°C
-0.260 %/°C
0.030 %/°C better in heat
Weight
27.2 kg
33.5 kg
6.3 kg lighter
Product warranty
15 yrs
12 yrs
3 yrs longer
Short-circuit current
14.14 A
16.86 A
2.72 A apart
Module area
2.583 m²
2.701 m²
0.118 m² apart
Weight per kWp
47.3 kg/kWp
50.0 kg/kWp
2.7 kg/kWp lighter
Current at max power
13.10 A
16.19 A
3.09 A apart
Cell count
144
132
12 cells apart
Open-circuit voltage
52.06 V
50.12 V
1.94 V apart
Bifacial
No
Yes
No vs Yes
Voltage at max power
43.91 V
41.38 V
2.53 V apart
Dimensions
2278x1134x30 mm
2382x1134x30 mm
2278x1134x30 mm vs 2382x1134x30 mm
02
What it means on a roof
Thirty years of production
A 1.0% first-year loss then 0.40% a year, assumed for both panels, at 1,200 kWh/kWp a year
LR5-72HTH-575M
19,292 kWh
LR8-66HYD-670M
22,480 kWh
Lifetime gap
3,188 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
LR5-72HTH-575M
LR8-66HYD-670M
Standard test conditions
25 °C
100.0% of rated power
575 W
670 W
Cool, bright day
40 °C
95.7% of rated power
550 W
644 W
Typical summer roof
55 °C
91.3% of rated power
525 W
618 W
Hot roof
70 °C
87.0% of rated power
500 W
592 W
03
Full specification
Parameter
LR5-72HTH-575M
LR8-66HYD-670M
Difference
Power and efficiency
Rated power
575 Wp
670 Wp
+95 W for LR8-66HYD-670M
Module efficiency
22.30 %
24.80 %
+2.50 pp for LR8-66HYD-670M
Power density
222.6 Wp/m²
248.0 Wp/m²
+25.5 Wp/m² for LR8-66HYD-670M
Open-circuit voltage
52.06 V
50.12 V
1.94 V apart
Voltage at max power
43.91 V
41.38 V
2.53 V apart
Short-circuit current
14.14 A
16.86 A
2.72 A apart
Current at max power
13.10 A
16.19 A
3.09 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.260 %/°C
+0.030 %/°C for LR8-66HYD-670M
Mechanical
Dimensions
2278x1134x30 mm
2382x1134x30 mm
2278x1134x30 mm vs 2382x1134x30 mm
Module area
2.583 m²
2.701 m²
0.118 m² apart
Weight
27.2 kg
33.5 kg
-6.3 kg for LR5-72HTH-575M
Weight per kWp
47.3 kg/kWp
50.0 kg/kWp
-2.7 kg/kWp for LR5-72HTH-575M
Warranty and degradation
Product warranty
15 yrs
12 yrs
+3 yrs for LR5-72HTH-575M
Performance warranty
25 yrs
30 yrs
+5 yrs for LR8-66HYD-670M
Annual degradation
0.40 %/yr
-
Not published by Longi Solar
Technology
Cell technology
-
Back Contact
Not published by Longi Solar
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
#5,161
vs
#13
LR8-66HYD-670M leads by 5,148 places
Power density
#5,612
vs
#15
LR8-66HYD-670M leads by 5,597 places
Heat behaviour
#2,220
vs
#515
LR8-66HYD-670M leads by 1,705 places
Weight
#1,627
vs
#3,329
LR5-72HTH-575M leads by 1,702 places
Warranty
#9,912
vs
#21
LR8-66HYD-670M leads by 9,891 places
Overall
#5,221
vs
#497
LR8-66HYD-670M leads by 4,724 places
05
Open the full database
More useful comparisons
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Longi Solar LR5-72HTH-575M vs Longi Solar LR5-72HTH-570M
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Longi Solar LR5-72HTH-575M vs Longi Solar LR5-72HTH-565M
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Same series, other bin
Longi Solar LR8-66HYD-670M vs Longi Solar LR8-66HYD-665M
One difference: module efficiency
Same series, other bin
Longi Solar LR8-66HYD-670M vs Longi Solar LR8-66HYD-660M
3 differences, the largest is module efficiency
06
Written summary
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07
Questions about this pairing
Which panel is better: Longi Solar LR5-72HTH-575M or Longi Solar LR8-66HYD-670M?
According to our database: Longi Solar LR8-66HYD-670M has higher module efficiency (24.80% vs 22.30%); Longi Solar LR8-66HYD-670M tolerates heat better (temp coeff -0.260%/°C vs -0.290%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR5-72HTH-575M and Longi Solar LR8-66HYD-670M?
Longi Solar LR5-72HTH-575M has a module efficiency of 22.30%, while Longi Solar LR8-66HYD-670M is 24.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR5-72HTH-575M use vs Longi Solar LR8-66HYD-670M?
Longi Solar LR5-72HTH-575M uses Monocrystalline cells; Longi Solar LR8-66HYD-670M 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 LR5-72HTH-575M and Longi Solar LR8-66HYD-670M?
Longi Solar LR5-72HTH-575M has a 25 years power warranty; Longi Solar LR8-66HYD-670M 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 LR5-72HTH-575M and Longi Solar LR8-66HYD-670M bifacial panels?
Longi Solar LR8-66HYD-670M is bifacial (captures light from both faces); Longi Solar LR5-72HTH-575M is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Shop prices: See 156 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.