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LR8-66HYD-655M vs LR5-72HBD-540M 6 of 18 identical Swap Change panels

Longi Solar LR8-66HYD-655M vs Longi Solar LR5-72HBD-540M

Longi Solar LR8-66HYD-655M
LR8-66HYD-655M
655 Wp 24.20 % Back Contact Bifacial
Open panel page Datasheet PDF
VS
Longi Solar LR5-72HBD-540M
LR5-72HBD-540M
540 Wp 20.90 % Bifacial
Open panel page Datasheet PDF
The verdict

LR8-66HYD-655M leads on the differences that matter

The largest is module efficiency: 3.30 pp more efficient. 6 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 12 differences
How alike are they
6 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

12 of 18 parameters
Parameter LR8-66HYD-655M LR5-72HBD-540M Difference
Module efficiency 24.20 % 20.90 % 3.30 pp more efficient
Temperature coefficient -0.260 %/°C -0.340 %/°C 0.080 %/°C better in heat
Rated power 655 Wp 540 Wp 115 W more power
Power density 242.5 Wp/m² 209.0 Wp/m² 33.4 Wp/m² higher
Weight per kWp 51.1 kg/kWp 58.9 kg/kWp 7.7 kg/kWp lighter
Annual degradation 0.35 %/yr 0.45 %/yr 0.10 %/yr slower
Short-circuit current 16.57 A 13.85 A 2.72 A apart
Module area 2.701 m² 2.583 m² 0.118 m² apart
Weight 33.5 kg 31.8 kg 1.7 kg lighter
Current at max power 15.87 A 12.97 A 2.90 A apart
Cell count 132 144 12 cells apart
Dimensions 2382x1134x30 mm 2278x1134x30 mm 2382x1134x30 mm vs 2278x1134x30 mm
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
LR8-66HYD-655M
22,148 kWh
LR5-72HBD-540M
17,783 kWh
Lifetime gap
4,365 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario LR8-66HYD-655M LR5-72HBD-540M
Standard test conditions 25 °C 100.0% of rated power 655 W 540 W
Cool, bright day 40 °C 94.9% of rated power 629 W 512 W
Typical summer roof 55 °C 89.8% of rated power 604 W 485 W
Hot roof 70 °C 84.7% of rated power 578 W 457 W
03

Full specification

Parameter LR8-66HYD-655M LR5-72HBD-540M Difference
Power and efficiency
Rated power 655 Wp 540 Wp +115 W for LR8-66HYD-655M
Module efficiency 24.20 % 20.90 % +3.30 pp for LR8-66HYD-655M
Power density 242.5 Wp/m² 209.0 Wp/m² +33.4 Wp/m² for LR8-66HYD-655M
Open-circuit voltage 50.11 V 49.50 V Effectively the same
Voltage at max power 41.30 V 41.65 V Effectively the same
Short-circuit current 16.57 A 13.85 A 2.72 A apart
Current at max power 15.87 A 12.97 A 2.90 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.340 %/°C +0.080 %/°C for LR8-66HYD-655M
Mechanical
Dimensions 2382x1134x30 mm 2278x1134x30 mm 2382x1134x30 mm vs 2278x1134x30 mm
Module area 2.701 m² 2.583 m² 0.118 m² apart
Weight 33.5 kg 31.8 kg -1.7 kg for LR5-72HBD-540M
Weight per kWp 51.1 kg/kWp 58.9 kg/kWp -7.7 kg/kWp for LR8-66HYD-655M
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.35 %/yr 0.45 %/yr -0.10 %/yr for LR8-66HYD-655M
Technology
Cell technology Back Contact - Not published by Longi Solar
Cell type Monocrystalline Monocrystalline Same
Cell count 132 144 12 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#206 vs #10,148
LR8-66HYD-655M leads by 9,942 places
Power density
#192 vs #10,176
LR8-66HYD-655M leads by 9,984 places
Heat behaviour
#515 vs #8,846
LR8-66HYD-655M leads by 8,331 places
Weight
#4,527 vs #12,026
LR8-66HYD-655M leads by 7,499 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,022 vs #7,953
LR8-66HYD-655M leads by 6,931 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-660M
7 differences, the largest is open-circuit voltage
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
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR8-66HYD-655M or Longi Solar LR5-72HBD-540M?
According to our database: Longi Solar LR8-66HYD-655M has higher module efficiency (24.20% vs 20.90%); Longi Solar LR8-66HYD-655M tolerates heat better (temp coeff -0.260%/°C vs -0.340%/°C). 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 LR5-72HBD-540M?
Longi Solar LR8-66HYD-655M has a module efficiency of 24.20%, while Longi Solar LR5-72HBD-540M is 20.90%. 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 LR5-72HBD-540M?
Longi Solar LR8-66HYD-655M uses Back Contact cells; Longi Solar LR5-72HBD-540M uses Monocrystalline. 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 LR5-72HBD-540M?
Longi Solar LR8-66HYD-655M has a 30 years power warranty; Longi Solar LR5-72HBD-540M 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 LR5-72HBD-540M bifacial panels?
Both Longi Solar LR8-66HYD-655M and Longi Solar LR5-72HBD-540M 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.

Shop prices: See 152 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.