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605M vs 615M 16 of 19 identical Swap Change panels

Longi Solar LR8-66HGD-605M vs Longi Solar LR8-66HGD-615M

Longi Solar LR8-66HGD-605M
LR8-66HGD-605M
605 Wp 22.40 % Back Contact Bifacial
Open panel page Datasheet PDF
VS
Longi Solar LR8-66HGD-615M
LR8-66HGD-615M
615 Wp 22.80 % Back Contact Bifacial
Open panel page Datasheet PDF
The verdict

615M leads on the differences that matter

The largest is module efficiency: 0.40 pp more efficient. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter 605M 615M Difference
Module efficiency 22.40 % 22.80 % 0.40 pp more efficient
Power density 224.0 Wp/m² 227.7 Wp/m² 3.7 Wp/m² higher
Rated power 605 Wp 615 Wp 10 W more power
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 (-0.280 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
605M
20,299 kWh
615M
20,634 kWh
Lifetime gap
335 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 605M 615M
Standard test conditions 25 °C 100.0% of rated power 605 W 615 W
Cool, bright day 40 °C 95.8% of rated power 580 W 589 W
Typical summer roof 55 °C 91.6% of rated power 554 W 563 W
Hot roof 70 °C 87.4% of rated power 529 W 538 W
03

Full specification

Parameter 605M 615M Difference
Power and efficiency
Rated power 605 Wp 615 Wp +10 W for 615M
Module efficiency 22.40 % 22.80 % +0.40 pp for 615M
Power density 224.0 Wp/m² 227.7 Wp/m² +3.7 Wp/m² for 615M
Open-circuit voltage 48.18 V 48.58 V Effectively the same
Voltage at max power 40.31 V 40.71 V Effectively the same
Short-circuit current 15.90 A 16.00 A Effectively the same
Current at max power 15.01 A 15.11 A Effectively the same
Temperature
Temperature coefficient -0.280 %/°C -0.280 %/°C Same
Mechanical
Dimensions 2382x1134x30 mm 2382x1134x30 mm Same
Module area 2.701 m² 2.701 m² Same
Weight 32.5 kg 32.5 kg Same
Weight per kWp 53.7 kg/kWp 52.8 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology Back Contact Back Contact Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#4,834 vs #2,769
615M leads by 2,065 places
Power density
#4,841 vs #3,132
615M leads by 1,709 places
Heat behaviour
#1,347 vs #1,347
Tied - the same position in the database
Weight
#7,813 vs #6,602
615M leads by 1,211 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#3,738 vs #2,915
615M leads by 823 places
05

More useful comparisons

Open the full database
Same series, other bin
Longi Solar LR8-66HGD-605M vs Longi Solar LR8-66HGD-625M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR8-66HGD-605M vs Longi Solar LR8-66HGD-620M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR8-66HGD-605M vs Longi Solar LR8-66HGD-610M
One difference: module efficiency
Same series, other bin
Longi Solar LR8-66HGD-605M vs Longi Solar LR8-66HGD-600M
One difference: module efficiency
Same series, other bin
Longi Solar LR8-66HGD-605M vs Longi Solar LR8-66HGD-595M
3 differences, the largest is module efficiency
Same manufacturer
Longi Solar LR8-66HGD-605M vs Longi Solar LR7-72HVHF-670M
13 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR8-66HGD-605M or Longi Solar LR8-66HGD-615M?
According to our database: Longi Solar LR8-66HGD-615M has higher module efficiency (22.80% vs 22.40%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR8-66HGD-605M and Longi Solar LR8-66HGD-615M?
Longi Solar LR8-66HGD-605M has a module efficiency of 22.40%, while Longi Solar LR8-66HGD-615M is 22.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR8-66HGD-605M use vs Longi Solar LR8-66HGD-615M?
Longi Solar LR8-66HGD-605M uses Back Contact cells; Longi Solar LR8-66HGD-615M 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 LR8-66HGD-605M and Longi Solar LR8-66HGD-615M?
Longi Solar LR8-66HGD-605M has a 30 years power warranty; Longi Solar LR8-66HGD-615M 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 LR8-66HGD-605M and Longi Solar LR8-66HGD-615M bifacial panels?
Both Longi Solar LR8-66HGD-605M and Longi Solar LR8-66HGD-615M 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 157 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.