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LR8-66HYD-655M vs LR7-72HYD-660M 12 of 19 identical Swap Change panels

Longi Solar LR8-66HYD-655M vs Longi Solar LR7-72HYD-660M

Longi Solar LR8-66HYD-655M
LR8-66HYD-655M
655 Wp 24.20 % Back Contact Bifacial
Open panel page Datasheet PDF
VS
Longi Solar LR7-72HYD-660M
LR7-72HYD-660M
660 Wp 24.40 % N-type Bifacial
Open panel page Datasheet PDF
The verdict

LR7-72HYD-660M leads on the differences that matter

The largest is open-circuit voltage: 4.31 V apart. 12 of 19 comparable parameters are identical.

See all 7 differences
How alike are they
12 of 19 comparable
parameters are identical
identical differs
01

What actually differs

7 of 19 parameters
Parameter LR8-66HYD-655M LR7-72HYD-660M Difference
Open-circuit voltage 50.11 V 54.42 V 4.31 V apart
Short-circuit current 16.57 A 15.30 A 1.27 A apart
Cell technology Back Contact N-type Back Contact vs N-type
Module efficiency 24.20 % 24.40 % 0.20 pp more efficient
Cell count 132 144 12 cells apart
Voltage at max power 41.30 V 45.07 V 3.77 V apart
Current at max power 15.87 A 14.65 A 1.22 A apart
02

What it means on a roof

Thirty years of production
Each panel's own declared degradation curve, 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-655M
22,148 kWh
LR7-72HYD-660M
22,317 kWh
Lifetime gap
169 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario LR8-66HYD-655M LR7-72HYD-660M
Standard test conditions 25 °C 100.0% of rated power 655 W 660 W
Cool, bright day 40 °C 96.1% of rated power 629 W 634 W
Typical summer roof 55 °C 92.2% of rated power 604 W 609 W
Hot roof 70 °C 88.3% of rated power 578 W 583 W
03

Full specification

Parameter LR8-66HYD-655M LR7-72HYD-660M Difference
Power and efficiency
Rated power 655 Wp 660 Wp Effectively the same
Module efficiency 24.20 % 24.40 % +0.20 pp for LR7-72HYD-660M
Power density 242.5 Wp/m² 244.3 Wp/m² Effectively the same
Open-circuit voltage 50.11 V 54.42 V 4.31 V apart
Voltage at max power 41.30 V 45.07 V 3.77 V apart
Short-circuit current 16.57 A 15.30 A 1.27 A apart
Current at max power 15.87 A 14.65 A 1.22 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.260 %/°C Same
Mechanical
Dimensions 2382x1134x30 mm 2382x1134x30 mm Same
Module area 2.701 m² 2.701 m² Same
Weight 33.5 kg 33.5 kg Same
Weight per kWp 51.1 kg/kWp 50.8 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.35 %/yr 0.35 %/yr Same
Technology
Cell technology Back Contact N-type Back Contact vs N-type
Cell type Monocrystalline Monocrystalline Same
Cell count 132 144 12 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#184 vs #99
LR7-72HYD-660M leads by 85 places
Power density
#172 vs #88
LR7-72HYD-660M leads by 84 places
Heat behaviour
#511 vs #511
Tied - the same position in the database
Weight
#4,503 vs #4,172
LR7-72HYD-660M leads by 331 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,007 vs #817
LR7-72HYD-660M leads by 190 places
05

More useful comparisons

Open the full database
Same series, other bin
Longi Solar LR8-66HYD-655M vs Longi Solar LR8-66HYD-670M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR8-66HYD-655M vs Longi Solar LR8-66HYD-665M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR8-66HYD-655M vs Longi Solar LR8-66HYD-660M
One difference: module efficiency
Same series, other bin
Longi Solar LR8-66HYD-655M vs Longi Solar LR7-72HYD-655M
6 differences, the largest is open-circuit voltage
Same series, other bin
Longi Solar LR8-66HYD-655M vs Longi Solar LR8-66HYD-650M
The same specification on paper
Same series, other bin
Longi Solar LR8-66HYD-655M vs Longi Solar LR7-72HYD-650M
6 differences, the largest is open-circuit voltage
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR8-66HYD-655M or Longi Solar LR7-72HYD-660M?
According to our database: Longi Solar LR7-72HYD-660M has higher module efficiency (24.40% vs 24.20%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR8-66HYD-655M and Longi Solar LR7-72HYD-660M?
Longi Solar LR8-66HYD-655M has a module efficiency of 24.20%, while Longi Solar LR7-72HYD-660M is 24.40%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR8-66HYD-655M use vs Longi Solar LR7-72HYD-660M?
Longi Solar LR8-66HYD-655M uses Back Contact cells; Longi Solar LR7-72HYD-660M 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-655M and Longi Solar LR7-72HYD-660M?
Longi Solar LR8-66HYD-655M has a 30 years power warranty; Longi Solar LR7-72HYD-660M 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-655M and Longi Solar LR7-72HYD-660M bifacial panels?
Both Longi Solar LR8-66HYD-655M and Longi Solar LR7-72HYD-660M 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.