Longi Solar 620M vs Longi Solar 605M
VS
The verdict
620M leads on the differences that matter
The largest is module efficiency: 0.50 pp more efficient. 14 of 17 comparable parameters are identical, with 2 more left out because at least one datasheet does not publish them.
See all 3 differencesHow alike are they
14
of 17 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
3 of 17 parameters
What actually differs
Parameter
620M
605M
Difference
Module efficiency
23.10 %
22.60 %
0.50 pp more efficient
Power density
231.3 Wp/m²
225.7 Wp/m²
5.6 Wp/m² higher
Rated power
620 Wp
605 Wp
15 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.
620M
20,802 kWh
605M
20,299 kWh
Lifetime gap
503 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
620M
605M
Standard test conditions
25 °C
100.0% of rated power
620 W
605 W
Cool, bright day
40 °C
95.8% of rated power
594 W
580 W
Typical summer roof
55 °C
91.6% of rated power
568 W
554 W
Hot roof
70 °C
87.4% of rated power
542 W
529 W
03
Full specification
Parameter
620M
605M
Difference
Power and efficiency
Rated power
620 Wp
605 Wp
+15 W for 620M
Module efficiency
23.10 %
22.60 %
+0.50 pp for 620M
Power density
231.3 Wp/m²
225.7 Wp/m²
+5.6 Wp/m² for 620M
Open-circuit voltage
53.11 V
52.66 V
Effectively the same
Voltage at max power
44.77 V
44.33 V
Effectively the same
Short-circuit current
14.82 A
14.62 A
Effectively the same
Current at max power
13.85 A
13.65 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
50.0 kg/kWp
51.2 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
-
-
Neither datasheet publishes this
Bifacial
No
No
Same
04
14,129 panels
Against the whole database
Efficiency
#1,617
vs
#3,716
620M leads by 2,099 places
Power density
#1,665
vs
#3,901
620M leads by 2,236 places
Heat behaviour
#1,347
vs
#1,347
Tied - the same position in the database
Weight
#3,329
vs
#4,655
620M leads by 1,326 places
Warranty
#9,912
vs
#9,912
Tied - the same position in the database
Overall
#1,436
vs
#2,015
620M leads by 579 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: Longi Solar 620M or Longi Solar 605M?
According to our database: Longi Solar 620M has higher module efficiency (23.10% 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 620M and Longi Solar 605M?
Longi Solar 620M has a module efficiency of 23.10%, while Longi Solar 605M is 22.60%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar 620M use vs Longi Solar 605M?
Longi Solar 620M uses Monocrystalline cells; Longi Solar 605M 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 620M and Longi Solar 605M?
Longi Solar 620M has a 25 years power warranty; Longi Solar 605M 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.