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LR7-54HJBB-490M vs LR8-66HYD-670M 3 of 18 identical Swap Change panels

Longi Solar LR7-54HJBB-490M vs Longi Solar LR8-66HYD-670M

Longi Solar LR7-54HJBB-490M
LR7-54HJBB-490M
490 Wp 24.00 % N-type Bifacial
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

15 differences, and they point both ways

The largest is module efficiency: 0.80 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 LR7-54HJBB-490M LR8-66HYD-670M Difference
Module efficiency 24.00 % 24.80 % 0.80 pp more efficient
Rated power 490 Wp 670 Wp 180 W more power
Weight 23.5 kg 33.5 kg 10.0 kg lighter
Product warranty 30 yrs 12 yrs 18 yrs longer
Power density 240.1 Wp/m² 248.0 Wp/m² 8.0 Wp/m² higher
Temperature coefficient -0.240 %/°C -0.260 %/°C 0.020 %/°C better in heat
Open-circuit voltage 41.25 V 50.12 V 8.87 V apart
Module area 2.041 m² 2.701 m² 0.660 m² apart
Short-circuit current 15.04 A 16.86 A 1.82 A apart
Cell technology N-type Back Contact N-type vs Back Contact
Voltage at max power 34.07 V 41.38 V 7.31 V apart
Cell count 108 132 24 cells apart
Current at max power 14.38 A 16.19 A 1.81 A apart
Weight per kWp 48.0 kg/kWp 50.0 kg/kWp 2.0 kg/kWp lighter
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
LR7-54HJBB-490M
16,440 kWh
LR8-66HYD-670M
22,480 kWh
Lifetime gap
6,040 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario LR7-54HJBB-490M LR8-66HYD-670M
Standard test conditions 25 °C 100.0% of rated power 490 W 670 W
Cool, bright day 40 °C 96.1% of rated power 472 W 644 W
Typical summer roof 55 °C 92.2% of rated power 455 W 618 W
Hot roof 70 °C 88.3% of rated power 437 W 592 W
03

Full specification

Parameter LR7-54HJBB-490M LR8-66HYD-670M Difference
Power and efficiency
Rated power 490 Wp 670 Wp +180 W for LR8-66HYD-670M
Module efficiency 24.00 % 24.80 % +0.80 pp for LR8-66HYD-670M
Power density 240.1 Wp/m² 248.0 Wp/m² +8.0 Wp/m² for LR8-66HYD-670M
Open-circuit voltage 41.25 V 50.12 V 8.87 V apart
Voltage at max power 34.07 V 41.38 V 7.31 V apart
Short-circuit current 15.04 A 16.86 A 1.82 A apart
Current at max power 14.38 A 16.19 A 1.81 A apart
Temperature
Temperature coefficient -0.240 %/°C -0.260 %/°C +0.020 %/°C for LR7-54HJBB-490M
Mechanical
Dimensions 1800x1134x30 mm 2382x1134x30 mm 1800x1134x30 mm vs 2382x1134x30 mm
Module area 2.041 m² 2.701 m² 0.660 m² apart
Weight 23.5 kg 33.5 kg -10.0 kg for LR7-54HJBB-490M
Weight per kWp 48.0 kg/kWp 50.0 kg/kWp -2.0 kg/kWp for LR7-54HJBB-490M
Warranty and degradation
Product warranty 30 yrs 12 yrs +18 yrs for LR7-54HJBB-490M
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 Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#303 vs #12
LR8-66HYD-670M leads by 291 places
Power density
#313 vs #14
LR8-66HYD-670M leads by 299 places
Heat behaviour
#13 vs #511
LR7-54HJBB-490M leads by 498 places
Weight
#1,984 vs #3,317
LR7-54HJBB-490M leads by 1,333 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,149 vs #490
LR8-66HYD-670M leads by 1,659 places
05

More useful comparisons

Open the full database
Same series, other bin
Longi Solar LR7-54HJBB-490M vs Longi Solar LR7-54HJBB-505M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-54HJBB-490M vs Longi Solar LR7-54HJBB-500M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-54HJBB-490M vs Longi Solar LR7-54HJBB-495M
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
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR7-54HJBB-490M or Longi Solar LR8-66HYD-670M?
According to our database: Longi Solar LR8-66HYD-670M has higher module efficiency (24.80% vs 24.00%); Longi Solar LR7-54HJBB-490M tolerates heat better (temp coeff -0.240%/°C vs -0.260%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR7-54HJBB-490M and Longi Solar LR8-66HYD-670M?
Longi Solar LR7-54HJBB-490M has a module efficiency of 24.00%, 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 LR7-54HJBB-490M use vs Longi Solar LR8-66HYD-670M?
Longi Solar LR7-54HJBB-490M 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 LR7-54HJBB-490M and Longi Solar LR8-66HYD-670M?
Longi Solar LR7-54HJBB-490M 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 LR7-54HJBB-490M and Longi Solar LR8-66HYD-670M bifacial panels?
Both Longi Solar LR7-54HJBB-490M and Longi Solar LR8-66HYD-670M are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.

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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.