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LR8-66HYD-670M vs LR5-72HTH-585M 1 of 17 identical Swap Change panels

Longi Solar LR8-66HYD-670M vs Longi Solar LR5-72HTH-585M

Longi Solar LR8-66HYD-670M
LR8-66HYD-670M
670 Wp 24.80 % Back Contact Bifacial Incomplete
Open panel page Datasheet PDF
VS
Longi Solar LR5-72HTH-585M
LR5-72HTH-585M
585 Wp 22.60 %
Open panel page Datasheet PDF
The verdict

LR8-66HYD-670M leads on the differences that matter

The largest is module efficiency: 2.20 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 differences
How alike are they
1 of 17 comparable
parameters are identical
identical differs not published
01

What actually differs

16 of 17 parameters
Parameter LR8-66HYD-670M LR5-72HTH-585M Difference
Module efficiency 24.80 % 22.60 % 2.20 pp more efficient
Rated power 670 Wp 585 Wp 85 W more power
Power density 248.0 Wp/m² 226.5 Wp/m² 21.6 Wp/m² higher
Performance warranty 30 yrs 25 yrs 5 yrs longer
Temperature coefficient -0.260 %/°C -0.290 %/°C 0.030 %/°C better in heat
Weight 33.5 kg 27.2 kg 6.3 kg lighter
Product warranty 12 yrs 15 yrs 3 yrs longer
Short-circuit current 16.86 A 14.27 A 2.59 A apart
Module area 2.701 m² 2.583 m² 0.118 m² apart
Weight per kWp 50.0 kg/kWp 46.5 kg/kWp 3.5 kg/kWp lighter
Open-circuit voltage 50.12 V 52.36 V 2.24 V apart
Current at max power 16.19 A 13.24 A 2.95 A apart
Cell count 132 144 12 cells apart
Bifacial Yes No Yes vs No
Voltage at max power 41.38 V 44.21 V 2.83 V apart
Dimensions 2382x1134x30 mm 2278x1134x30 mm 2382x1134x30 mm vs 2278x1134x30 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
LR8-66HYD-670M
22,480 kWh
LR5-72HTH-585M
19,628 kWh
Lifetime gap
2,852 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario LR8-66HYD-670M LR5-72HTH-585M
Standard test conditions 25 °C 100.0% of rated power 670 W 585 W
Cool, bright day 40 °C 95.7% of rated power 644 W 560 W
Typical summer roof 55 °C 91.3% of rated power 618 W 534 W
Hot roof 70 °C 87.0% of rated power 592 W 509 W
03

Full specification

Parameter LR8-66HYD-670M LR5-72HTH-585M Difference
Power and efficiency
Rated power 670 Wp 585 Wp +85 W for LR8-66HYD-670M
Module efficiency 24.80 % 22.60 % +2.20 pp for LR8-66HYD-670M
Power density 248.0 Wp/m² 226.5 Wp/m² +21.6 Wp/m² for LR8-66HYD-670M
Open-circuit voltage 50.12 V 52.36 V 2.24 V apart
Voltage at max power 41.38 V 44.21 V 2.83 V apart
Short-circuit current 16.86 A 14.27 A 2.59 A apart
Current at max power 16.19 A 13.24 A 2.95 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.290 %/°C +0.030 %/°C for LR8-66HYD-670M
Mechanical
Dimensions 2382x1134x30 mm 2278x1134x30 mm 2382x1134x30 mm vs 2278x1134x30 mm
Module area 2.701 m² 2.583 m² 0.118 m² apart
Weight 33.5 kg 27.2 kg -6.3 kg for LR5-72HTH-585M
Weight per kWp 50.0 kg/kWp 46.5 kg/kWp -3.5 kg/kWp for LR5-72HTH-585M
Warranty and degradation
Product warranty 12 yrs 15 yrs +3 yrs for LR5-72HTH-585M
Performance warranty 30 yrs 25 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 132 144 12 cells apart
Bifacial Yes No Yes vs No
04

Against the whole database

14,129 panels
Efficiency
#13 vs #3,716
LR8-66HYD-670M leads by 3,703 places
Power density
#15 vs #3,557
LR8-66HYD-670M leads by 3,542 places
Heat behaviour
#515 vs #2,220
LR8-66HYD-670M leads by 1,705 places
Weight
#3,329 vs #1,186
LR5-72HTH-585M leads by 2,143 places
Warranty
#21 vs #9,912
LR8-66HYD-670M leads by 9,891 places
Overall
#497 vs #4,515
LR8-66HYD-670M leads by 4,018 places
05

More useful comparisons

Open the full database
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
Same series, other bin
Longi Solar LR8-66HYD-670M vs Longi Solar LR7-72HYD-660M
9 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR8-66HYD-670M vs Longi Solar LR8-66HYD-655M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR8-66HYD-670M vs Longi Solar LR7-72HYD-655M
9 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR8-66HYD-670M vs Longi Solar LR8-66HYD-650M
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR8-66HYD-670M or Longi Solar LR5-72HTH-585M?
According to our database: Longi Solar LR8-66HYD-670M has higher module efficiency (24.80% vs 22.60%); 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 LR8-66HYD-670M and Longi Solar LR5-72HTH-585M?
Longi Solar LR8-66HYD-670M has a module efficiency of 24.80%, while Longi Solar LR5-72HTH-585M is 22.60%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR8-66HYD-670M use vs Longi Solar LR5-72HTH-585M?
Longi Solar LR8-66HYD-670M uses Back Contact cells; Longi Solar LR5-72HTH-585M uses Monocrystalline. 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 LR8-66HYD-670M and Longi Solar LR5-72HTH-585M?
Longi Solar LR8-66HYD-670M has a 30 years power warranty; Longi Solar LR5-72HTH-585M has a 25 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 LR8-66HYD-670M and Longi Solar LR5-72HTH-585M bifacial panels?
Longi Solar LR8-66HYD-670M is bifacial (captures light from both faces); Longi Solar LR5-72HTH-585M 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.