Longi Solar LR8-66HGD-615M vs Longi Solar LR8-66HGD-625M
VS
The verdict
625M leads on the differences that matter
The largest is module efficiency: 0.30 pp more efficient. 16 of 19 comparable parameters are identical.
See all 3 differencesHow alike are they
16
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
3 of 19 parameters
What actually differs
Parameter
615M
625M
Difference
Module efficiency
22.80 %
23.10 %
0.30 pp more efficient
Power density
227.7 Wp/m²
231.4 Wp/m²
3.7 Wp/m² higher
Rated power
615 Wp
625 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.
615M
20,634 kWh
625M
20,970 kWh
Lifetime gap
336 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
615M
625M
Standard test conditions
25 °C
100.0% of rated power
615 W
625 W
Cool, bright day
40 °C
95.8% of rated power
589 W
599 W
Typical summer roof
55 °C
91.6% of rated power
563 W
573 W
Hot roof
70 °C
87.4% of rated power
538 W
546 W
03
Full specification
Parameter
615M
625M
Difference
Power and efficiency
Rated power
615 Wp
625 Wp
+10 W for 625M
Module efficiency
22.80 %
23.10 %
+0.30 pp for 625M
Power density
227.7 Wp/m²
231.4 Wp/m²
+3.7 Wp/m² for 625M
Open-circuit voltage
48.58 V
48.98 V
Effectively the same
Voltage at max power
40.71 V
41.11 V
Effectively the same
Short-circuit current
16.00 A
16.10 A
Effectively the same
Current at max power
15.11 A
15.21 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
52.8 kg/kWp
52.0 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
14,129 panels
Against the whole database
Efficiency
#2,769
vs
#1,617
625M leads by 1,152 places
Power density
#3,132
vs
#1,558
625M leads by 1,574 places
Heat behaviour
#1,347
vs
#1,347
Tied - the same position in the database
Weight
#6,602
vs
#5,449
625M leads by 1,153 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#2,915
vs
#2,293
625M leads by 622 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 LR8-66HGD-615M or Longi Solar LR8-66HGD-625M?
According to our database: Longi Solar LR8-66HGD-625M has higher module efficiency (23.10% vs 22.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR8-66HGD-615M and Longi Solar LR8-66HGD-625M?
Longi Solar LR8-66HGD-615M has a module efficiency of 22.80%, while Longi Solar LR8-66HGD-625M is 23.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR8-66HGD-615M use vs Longi Solar LR8-66HGD-625M?
Longi Solar LR8-66HGD-615M uses Back Contact cells; Longi Solar LR8-66HGD-625M 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-615M and Longi Solar LR8-66HGD-625M?
Longi Solar LR8-66HGD-615M has a 30 years power warranty; Longi Solar LR8-66HGD-625M 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-615M and Longi Solar LR8-66HGD-625M bifacial panels?
Both Longi Solar LR8-66HGD-615M and Longi Solar LR8-66HGD-625M 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.