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LR7-72HTH-605M vs LR8-66HYD-670M 3 of 18 identical Swap Change panels

Longi Solar LR7-72HTH-605M vs Longi Solar LR8-66HYD-670M

Longi Solar LR7-72HTH-605M
LR7-72HTH-605M
605 Wp 22.40 % N-type
Open panel page Datasheet PDF
VS
Longi Solar LR8-66HYD-670M
LR8-66HYD-670M
670 Wp 24.80 % Back Contact Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

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

The largest is module efficiency: 2.40 pp more efficient. 3 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 15 differences
How alike are they
3 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

15 of 18 parameters
Parameter LR7-72HTH-605M LR8-66HYD-670M Difference
Module efficiency 22.40 % 24.80 % 2.40 pp more efficient
Rated power 605 Wp 670 Wp 65 W more power
Power density 224.0 Wp/m² 248.0 Wp/m² 24.1 Wp/m² higher
Performance warranty 25 yrs 30 yrs 5 yrs longer
Weight 28.5 kg 33.5 kg 5.0 kg lighter
Temperature coefficient -0.280 %/°C -0.260 %/°C 0.020 %/°C better in heat
Product warranty 15 yrs 12 yrs 3 yrs longer
Short-circuit current 14.74 A 16.86 A 2.12 A apart
Cell technology N-type Back Contact N-type vs Back Contact
Weight per kWp 47.1 kg/kWp 50.0 kg/kWp 2.9 kg/kWp lighter
Open-circuit voltage 52.27 V 50.12 V 2.15 V apart
Current at max power 13.75 A 16.19 A 2.44 A apart
Cell count 144 132 12 cells apart
Bifacial No Yes No vs Yes
Voltage at max power 44.03 V 41.38 V 2.65 V apart
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
LR7-72HTH-605M
20,299 kWh
LR8-66HYD-670M
22,480 kWh
Lifetime gap
2,181 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario LR7-72HTH-605M LR8-66HYD-670M
Standard test conditions 25 °C 100.0% of rated power 605 W 670 W
Cool, bright day 40 °C 95.8% of rated power 580 W 644 W
Typical summer roof 55 °C 91.6% of rated power 554 W 618 W
Hot roof 70 °C 87.4% of rated power 529 W 592 W
03

Full specification

Parameter LR7-72HTH-605M LR8-66HYD-670M Difference
Power and efficiency
Rated power 605 Wp 670 Wp +65 W for LR8-66HYD-670M
Module efficiency 22.40 % 24.80 % +2.40 pp for LR8-66HYD-670M
Power density 224.0 Wp/m² 248.0 Wp/m² +24.1 Wp/m² for LR8-66HYD-670M
Open-circuit voltage 52.27 V 50.12 V 2.15 V apart
Voltage at max power 44.03 V 41.38 V 2.65 V apart
Short-circuit current 14.74 A 16.86 A 2.12 A apart
Current at max power 13.75 A 16.19 A 2.44 A apart
Temperature
Temperature coefficient -0.280 %/°C -0.260 %/°C +0.020 %/°C for LR8-66HYD-670M
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 LR7-72HTH-605M
Weight per kWp 47.1 kg/kWp 50.0 kg/kWp -2.9 kg/kWp for LR7-72HTH-605M
Warranty and degradation
Product warranty 15 yrs 12 yrs +3 yrs for LR7-72HTH-605M
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 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

Against the whole database

14,005 panels
Efficiency
#4,774 vs #12
LR8-66HYD-670M leads by 4,762 places
Power density
#4,780 vs #14
LR8-66HYD-670M leads by 4,766 places
Heat behaviour
#1,309 vs #511
LR8-66HYD-670M leads by 798 places
Weight
#1,498 vs #3,317
LR7-72HTH-605M leads by 1,819 places
Warranty
#9,798 vs #21
LR8-66HYD-670M leads by 9,777 places
Overall
#4,020 vs #490
LR8-66HYD-670M leads by 3,530 places
05

More useful comparisons

Open the full database
Same series, other bin
Longi Solar LR7-72HTH-605M vs Longi Solar LR7-72HTH-615M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HTH-605M vs Longi Solar LR7-72HTH-610M
One difference: module efficiency
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
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR7-72HTH-605M or Longi Solar LR8-66HYD-670M?
According to our database: Longi Solar LR8-66HYD-670M has higher module efficiency (24.80% vs 22.40%); Longi Solar LR8-66HYD-670M tolerates heat better (temp coeff -0.260%/°C vs -0.280%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR7-72HTH-605M and Longi Solar LR8-66HYD-670M?
Longi Solar LR7-72HTH-605M has a module efficiency of 22.40%, 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 LR7-72HTH-605M use vs Longi Solar LR8-66HYD-670M?
Longi Solar LR7-72HTH-605M uses N-type 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 LR7-72HTH-605M and Longi Solar LR8-66HYD-670M?
Longi Solar LR7-72HTH-605M 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 LR7-72HTH-605M and Longi Solar LR8-66HYD-670M bifacial panels?
Longi Solar LR8-66HYD-670M is bifacial (captures light from both faces); Longi Solar LR7-72HTH-605M is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

Shop prices: See 179 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.