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LR7-54HVH-485M vs LR8-66HYD-670M 3 of 18 identical Swap Change panels

Longi Solar LR7-54HVH-485M vs Longi Solar LR8-66HYD-670M

Longi Solar LR7-54HVH-485M
LR7-54HVH-485M
485 Wp 23.80 % 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: 1.00 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 LR7-54HVH-485M LR8-66HYD-670M Difference
Module efficiency 23.80 % 24.80 % 1.00 pp more efficient
Rated power 485 Wp 670 Wp 185 W more power
Power density 237.6 Wp/m² 248.0 Wp/m² 10.4 Wp/m² higher
Weight 21.6 kg 33.5 kg 11.9 kg lighter
Product warranty 15 yrs 12 yrs 3 yrs longer
Weight per kWp 44.5 kg/kWp 50.0 kg/kWp 5.5 kg/kWp lighter
Open-circuit voltage 40.40 V 50.12 V 9.72 V apart
Module area 2.041 m² 2.701 m² 0.660 m² apart
Short-circuit current 15.23 A 16.86 A 1.63 A apart
Cell technology N-type Back Contact N-type vs Back Contact
Voltage at max power 33.40 V 41.38 V 7.98 V apart
Cell count 108 132 24 cells apart
Current at max power 14.53 A 16.19 A 1.66 A apart
Bifacial No Yes No vs Yes
Dimensions 1800x1134x30 mm 2382x1134x30 mm 1800x1134x30 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
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.
LR7-54HVH-485M
16,273 kWh
LR8-66HYD-670M
22,480 kWh
Lifetime gap
6,207 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario LR7-54HVH-485M LR8-66HYD-670M
Standard test conditions 25 °C 100.0% of rated power 485 W 670 W
Cool, bright day 40 °C 96.1% of rated power 466 W 644 W
Typical summer roof 55 °C 92.2% of rated power 447 W 618 W
Hot roof 70 °C 88.3% of rated power 428 W 592 W
03

Full specification

Parameter LR7-54HVH-485M LR8-66HYD-670M Difference
Power and efficiency
Rated power 485 Wp 670 Wp +185 W for LR8-66HYD-670M
Module efficiency 23.80 % 24.80 % +1.00 pp for LR8-66HYD-670M
Power density 237.6 Wp/m² 248.0 Wp/m² +10.4 Wp/m² for LR8-66HYD-670M
Open-circuit voltage 40.40 V 50.12 V 9.72 V apart
Voltage at max power 33.40 V 41.38 V 7.98 V apart
Short-circuit current 15.23 A 16.86 A 1.63 A apart
Current at max power 14.53 A 16.19 A 1.66 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.260 %/°C Same
Mechanical
Dimensions 1800x1134x30 mm 2382x1134x30 mm 1800x1134x30 mm vs 2382x1134x30 mm
Module area 2.041 m² 2.701 m² 0.660 m² apart
Weight 21.6 kg 33.5 kg -11.9 kg for LR7-54HVH-485M
Weight per kWp 44.5 kg/kWp 50.0 kg/kWp -5.5 kg/kWp for LR7-54HVH-485M
Warranty and degradation
Product warranty 15 yrs 12 yrs +3 yrs for LR7-54HVH-485M
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.35 %/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 108 132 24 cells apart
Bifacial No Yes No vs Yes
04

Against the whole database

14,005 panels
Efficiency
#433 vs #12
LR8-66HYD-670M leads by 421 places
Power density
#495 vs #14
LR8-66HYD-670M leads by 481 places
Heat behaviour
#511 vs #511
Tied - the same position in the database
Weight
#465 vs #3,317
LR7-54HVH-485M leads by 2,852 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#5,435 vs #490
LR8-66HYD-670M leads by 4,945 places
05

More useful comparisons

Open the full database
Same series, other bin
Longi Solar LR7-54HVH-485M vs Longi Solar LR7-54HVH-500M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-54HVH-485M vs Longi Solar LR7-54HVH-495M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-54HVH-485M vs Longi Solar LR7-54HVH-490M
One difference: module efficiency
Same series, other bin
Longi Solar LR7-54HVH-485M vs Longi Solar LR7-54HVH-480M
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
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR7-54HVH-485M or Longi Solar LR8-66HYD-670M?
According to our database: Longi Solar LR8-66HYD-670M has higher module efficiency (24.80% vs 23.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR7-54HVH-485M and Longi Solar LR8-66HYD-670M?
Longi Solar LR7-54HVH-485M has a module efficiency of 23.80%, 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 LR7-54HVH-485M use vs Longi Solar LR8-66HYD-670M?
Longi Solar LR7-54HVH-485M 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 LR7-54HVH-485M and Longi Solar LR8-66HYD-670M?
Longi Solar LR7-54HVH-485M has a 30 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 LR7-54HVH-485M and Longi Solar LR8-66HYD-670M bifacial panels?
Longi Solar LR8-66HYD-670M is bifacial (captures light from both faces); Longi Solar LR7-54HVH-485M 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.