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LR7-72HVH-650M vs LR8-66HVD-645M 9 of 19 identical Swap Change panels

Longi Solar LR7-72HVH-650M vs Longi Solar LR8-66HVD-645M

Longi Solar LR7-72HVH-650M
LR7-72HVH-650M
650 Wp 24.10 % N-type
Open panel page Datasheet PDF
VS
Longi Solar LR8-66HVD-645M
LR8-66HVD-645M
645 Wp 23.88 % Back Contact Bifacial
Open panel page Datasheet PDF
The verdict

LR7-72HVH-650M leads on the differences that matter

The largest is weight: 5.0 kg lighter. 9 of 19 comparable parameters are identical.

See all 10 differences
How alike are they
9 of 19 comparable
parameters are identical
identical differs
01

What actually differs

10 of 19 parameters
Parameter LR7-72HVH-650M LR8-66HVD-645M Difference
Weight 28.5 kg 33.5 kg 5.0 kg lighter
Weight per kWp 43.8 kg/kWp 51.9 kg/kWp 8.1 kg/kWp lighter
Open-circuit voltage 53.90 V 49.62 V 4.28 V apart
Module efficiency 24.10 % 23.88 % 0.22 pp more efficient
Cell technology N-type Back Contact N-type vs Back Contact
Short-circuit current 15.29 A 16.46 A 1.17 A apart
Cell count 144 132 12 cells apart
Voltage at max power 44.56 V 40.88 V 3.68 V apart
Bifacial No Yes No vs Yes
Current at max power 14.59 A 15.78 A 1.19 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.
LR7-72HVH-650M
21,978 kWh
LR8-66HVD-645M
21,809 kWh
Lifetime gap
169 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario LR7-72HVH-650M LR8-66HVD-645M
Standard test conditions 25 °C 100.0% of rated power 650 W 645 W
Cool, bright day 40 °C 96.1% of rated power 625 W 620 W
Typical summer roof 55 °C 92.2% of rated power 599 W 595 W
Hot roof 70 °C 88.3% of rated power 574 W 570 W
03

Full specification

Parameter LR7-72HVH-650M LR8-66HVD-645M Difference
Power and efficiency
Rated power 650 Wp 645 Wp Effectively the same
Module efficiency 24.10 % 23.88 % +0.22 pp for LR7-72HVH-650M
Power density 240.6 Wp/m² 238.8 Wp/m² Effectively the same
Open-circuit voltage 53.90 V 49.62 V 4.28 V apart
Voltage at max power 44.56 V 40.88 V 3.68 V apart
Short-circuit current 15.29 A 16.46 A 1.17 A apart
Current at max power 14.59 A 15.78 A 1.19 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 28.5 kg 33.5 kg -5.0 kg for LR7-72HVH-650M
Weight per kWp 43.8 kg/kWp 51.9 kg/kWp -8.1 kg/kWp for LR7-72HVH-650M
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.35 %/yr 0.35 %/yr Same
Technology
Cell technology N-type Back Contact N-type vs Back Contact
Cell type Monocrystalline Monocrystalline Same
Cell count 144 132 12 cells apart
Bifacial No Yes No vs Yes
04

Against the whole database

14,005 panels
Efficiency
#219 vs #394
LR7-72HVH-650M leads by 175 places
Power density
#233 vs #356
LR7-72HVH-650M leads by 123 places
Heat behaviour
#511 vs #511
Tied - the same position in the database
Weight
#351 vs #5,361
LR7-72HVH-650M leads by 5,010 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#814 vs #1,084
LR7-72HVH-650M leads by 270 places
05

More useful comparisons

Open the full database
Same series, other bin
Longi Solar LR7-72HVH-650M vs Longi Solar LR7-72HVH-670M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HVH-650M vs Longi Solar LR7-72HVH-665M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HVH-650M vs Longi Solar LR7-72HVH-660M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HVH-650M vs Longi Solar LR7-72HVH-655M
The same specification on paper
Same series, other bin
Longi Solar LR7-72HVH-650M vs Longi Solar LR7-72HVH-645M
One difference: module efficiency
Same series, other bin
Longi Solar LR7-72HVH-650M vs Longi Solar LR7-72HVH-640M
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR7-72HVH-650M or Longi Solar LR8-66HVD-645M?
According to our database: Longi Solar LR7-72HVH-650M has higher module efficiency (24.10% vs 23.88%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR7-72HVH-650M and Longi Solar LR8-66HVD-645M?
Longi Solar LR7-72HVH-650M has a module efficiency of 24.10%, while Longi Solar LR8-66HVD-645M is 23.88%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR7-72HVH-650M use vs Longi Solar LR8-66HVD-645M?
Longi Solar LR7-72HVH-650M uses N-type cells; Longi Solar LR8-66HVD-645M 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 LR7-72HVH-650M and Longi Solar LR8-66HVD-645M?
Longi Solar LR7-72HVH-650M has a 30 years power warranty; Longi Solar LR8-66HVD-645M 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 LR7-72HVH-650M and Longi Solar LR8-66HVD-645M bifacial panels?
Longi Solar LR8-66HVD-645M is bifacial (captures light from both faces); Longi Solar LR7-72HVH-650M is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

Shop prices: See 145 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.