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605M vs 615M 15 of 18 identical Swap Change panels

Longi Solar LGi7-72HTD-605M vs Longi Solar LGi7-72HTD-615M

LGi7-72HTD-605M
605 Wp 22.60 %
Open panel page Datasheet PDF
VS
LGi7-72HTD-615M
615 Wp 22.90 %
Open panel page Datasheet PDF
The verdict

615M leads on the differences that matter

The largest is module efficiency: 0.30 pp more efficient. 15 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 3 differences
How alike are they
15 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

3 of 18 parameters
Parameter 605M 615M Difference
Module efficiency 22.60 % 22.90 % 0.30 pp more efficient
Power density 225.7 Wp/m² 229.5 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 22.60 % 22.90 % +0.30 pp for 615M
Power density 225.7 Wp/m² 229.5 Wp/m² +3.7 Wp/m² for 615M
Open-circuit voltage 52.66 V 52.96 V Effectively the same
Voltage at max power 44.33 V 44.63 V Effectively the same
Short-circuit current 14.62 A 14.75 A Effectively the same
Current at max power 13.65 A 13.78 A Effectively the same
Temperature
Temperature coefficient -0.280 %/°C -0.280 %/°C Same
Mechanical
Dimensions 2376x1128x5 mm 2376x1128x5 mm Same
Module area 2.680 m² 2.680 m² Same
Weight 31.0 kg 31.0 kg Same
Weight per kWp 51.2 kg/kWp 50.4 kg/kWp Effectively the same
Warranty and degradation
Product warranty 25 yrs 25 yrs Same
Performance warranty 25 yrs 25 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology - - Neither datasheet publishes this
Cell type Monocrystalline Monocrystalline Same
Cell count 72 72 Same
Bifacial No No Same
04

Against the whole database

14,129 panels
Efficiency
#3,716 vs #2,412
615M leads by 1,304 places
Power density
#3,901 vs #2,367
615M leads by 1,534 places
Heat behaviour
#1,347 vs #1,347
Tied - the same position in the database
Weight
#4,655 vs #3,802
615M leads by 853 places
Warranty
#9,912 vs #9,912
Tied - the same position in the database
Overall
#2,015 vs #1,620
615M leads by 395 places
05

More useful comparisons

Open the full database
Same series, other bin
Longi Solar LGi7-72HTD-605M vs Longi Solar 620M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LGi7-72HTD-605M vs Longi Solar LGi7-72HTD-620M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LGi7-72HTD-605M vs Longi Solar 615M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LGi7-72HTD-605M vs Longi Solar 610M
One difference: module efficiency
Same series, other bin
Longi Solar LGi7-72HTD-605M vs Longi Solar LGi7-72HTD-610M
One difference: module efficiency
Same series, other bin
Longi Solar LGi7-72HTD-605M vs Longi Solar 605M
The same specification on paper
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LGi7-72HTD-605M or Longi Solar LGi7-72HTD-615M?
According to our database: Longi Solar LGi7-72HTD-615M has higher module efficiency (22.90% vs 22.60%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LGi7-72HTD-605M and Longi Solar LGi7-72HTD-615M?
Longi Solar LGi7-72HTD-605M has a module efficiency of 22.60%, while Longi Solar LGi7-72HTD-615M is 22.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LGi7-72HTD-605M use vs Longi Solar LGi7-72HTD-615M?
Longi Solar LGi7-72HTD-605M uses Monocrystalline cells; Longi Solar LGi7-72HTD-615M 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 LGi7-72HTD-605M and Longi Solar LGi7-72HTD-615M?
Longi Solar LGi7-72HTD-605M has a 25 years power warranty; Longi Solar LGi7-72HTD-615M has a 25 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.

Shop prices: See 154 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.