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LR8-66HYD-670M vs LR7-54HVB-475M 3 of 17 identical Swap Change panels

Longi Solar LR8-66HYD-670M vs Longi Solar LR7-54HVB-475M

Longi Solar LR8-66HYD-670M
LR8-66HYD-670M
670 Wp 24.80 % Back Contact Bifacial Incomplete
Open panel page Datasheet PDF
VS
Longi Solar LR7-54HVB-475M
LR7-54HVB-475M
475 Wp 23.30 % N-type
Open panel page Datasheet PDF
The verdict

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

The largest is module efficiency: 1.50 pp more efficient. 3 of 17 comparable parameters are identical, with 2 more left out because at least one datasheet does not publish them.

See all 14 differences
How alike are they
3 of 17 comparable
parameters are identical
identical differs not published
01

What actually differs

14 of 17 parameters
Parameter LR8-66HYD-670M LR7-54HVB-475M Difference
Module efficiency 24.80 % 23.30 % 1.50 pp more efficient
Rated power 670 Wp 475 Wp 195 W more power
Power density 248.0 Wp/m² 232.7 Wp/m² 15.3 Wp/m² higher
Weight 33.5 kg 21.6 kg 11.9 kg lighter
Open-circuit voltage 50.12 V 40.18 V 9.94 V apart
Module area 2.701 m² 2.041 m² 0.660 m² apart
Short-circuit current 16.86 A 15.03 A 1.83 A apart
Weight per kWp 50.0 kg/kWp 45.5 kg/kWp 4.5 kg/kWp lighter
Cell technology Back Contact N-type Back Contact vs N-type
Voltage at max power 41.38 V 33.16 V 8.22 V apart
Cell count 132 108 24 cells apart
Current at max power 16.19 A 14.33 A 1.86 A apart
Bifacial Yes No Yes vs No
Dimensions 2382x1134x30 mm 1800x1134x30 mm 2382x1134x30 mm vs 1800x1134x30 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.
LR8-66HYD-670M
22,480 kWh
LR7-54HVB-475M
15,937 kWh
Lifetime gap
6,543 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario LR8-66HYD-670M LR7-54HVB-475M
Standard test conditions 25 °C 100.0% of rated power 670 W 475 W
Cool, bright day 40 °C 96.1% of rated power 644 W 456 W
Typical summer roof 55 °C 92.2% of rated power 618 W 438 W
Hot roof 70 °C 88.3% of rated power 592 W 419 W
03

Full specification

Parameter LR8-66HYD-670M LR7-54HVB-475M Difference
Power and efficiency
Rated power 670 Wp 475 Wp +195 W for LR8-66HYD-670M
Module efficiency 24.80 % 23.30 % +1.50 pp for LR8-66HYD-670M
Power density 248.0 Wp/m² 232.7 Wp/m² +15.3 Wp/m² for LR8-66HYD-670M
Open-circuit voltage 50.12 V 40.18 V 9.94 V apart
Voltage at max power 41.38 V 33.16 V 8.22 V apart
Short-circuit current 16.86 A 15.03 A 1.83 A apart
Current at max power 16.19 A 14.33 A 1.86 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.260 %/°C Same
Mechanical
Dimensions 2382x1134x30 mm 1800x1134x30 mm 2382x1134x30 mm vs 1800x1134x30 mm
Module area 2.701 m² 2.041 m² 0.660 m² apart
Weight 33.5 kg 21.6 kg -11.9 kg for LR7-54HVB-475M
Weight per kWp 50.0 kg/kWp 45.5 kg/kWp -4.5 kg/kWp for LR7-54HVB-475M
Warranty and degradation
Product warranty 12 yrs - Not published by Longi Solar
Performance warranty 30 yrs 30 yrs Same
Annual degradation - 0.35 %/yr Not published by Longi Solar
Technology
Cell technology Back Contact N-type Back Contact vs N-type
Cell type Monocrystalline Monocrystalline Same
Cell count 132 108 24 cells apart
Bifacial Yes No Yes vs No
04

Against the whole database

14,005 panels
Efficiency
#12 vs #1,017
LR8-66HYD-670M leads by 1,005 places
Power density
#14 vs #1,189
LR8-66HYD-670M leads by 1,175 places
Heat behaviour
#511 vs #511
Tied - the same position in the database
Weight
#3,317 vs #743
LR7-54HVB-475M leads by 2,574 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#490 vs #9,535
LR8-66HYD-670M leads by 9,045 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 LR7-54HVB-475M?
According to our database: Longi Solar LR8-66HYD-670M has higher module efficiency (24.80% vs 23.30%). 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 LR7-54HVB-475M?
Longi Solar LR8-66HYD-670M has a module efficiency of 24.80%, while Longi Solar LR7-54HVB-475M is 23.30%. 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 LR7-54HVB-475M?
Longi Solar LR8-66HYD-670M uses Back Contact cells; Longi Solar LR7-54HVB-475M uses N-type. 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 LR7-54HVB-475M?
Longi Solar LR8-66HYD-670M has a 30 years power warranty; Longi Solar LR7-54HVB-475M 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 LR8-66HYD-670M and Longi Solar LR7-54HVB-475M bifacial panels?
Longi Solar LR8-66HYD-670M is bifacial (captures light from both faces); Longi Solar LR7-54HVB-475M is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

Shop prices: See 149 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.