Longi Solar LR8-66HVD-645M vs DAH Solar DHN-66Z20/DG(BW)-625W
VS
DAH Solar
DHN-66Z20/DG(BW)-625W
625 Wp
23.14 %
TOPCon
Bifacial
Incomplete
The verdict
LR8-66HVD-645M leads on the differences that matter
The largest is module efficiency: 0.74 pp more efficient. 9 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 9 differencesHow alike are they
9
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
9 of 18 parameters
What actually differs
Parameter
LR8-66HVD-645M
DHN-66Z20/DG(BW)-625W
Difference
Module efficiency
23.88 %
23.14 %
0.74 pp more efficient
Temperature coefficient
-0.260 %/°C
-0.290 %/°C
0.030 %/°C better in heat
Power density
238.8 Wp/m²
231.4 Wp/m²
7.4 Wp/m² higher
Rated power
645 Wp
625 Wp
20 W more power
Cell technology
Back Contact
TOPCon
Back Contact vs TOPCon
Weight
33.5 kg
32.5 kg
1.0 kg lighter
Open-circuit voltage
49.62 V
48.40 V
1.22 V apart
Short-circuit current
16.46 A
15.96 A
0.50 A apart
Current at max power
15.78 A
14.96 A
0.82 A apart
02
What it means on a roof
Thirty years of production
Declared first-year losses, with 0.40% a year afterwards assumed for both panels, at 1,200 kWh/kWp a year
LR8-66HVD-645M
21,641 kWh
DHN-66Z20/DG(BW)-625W
20,970 kWh
Lifetime gap
671 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
LR8-66HVD-645M
DHN-66Z20/DG(BW)-625W
Standard test conditions
25 °C
100.0% of rated power
645 W
625 W
Cool, bright day
40 °C
95.7% of rated power
620 W
598 W
Typical summer roof
55 °C
91.3% of rated power
595 W
571 W
Hot roof
70 °C
87.0% of rated power
570 W
543 W
03
Full specification
Parameter
LR8-66HVD-645M
DHN-66Z20/DG(BW)-625W
Difference
Power and efficiency
Rated power
645 Wp
625 Wp
+20 W for LR8-66HVD-645M
Module efficiency
23.88 %
23.14 %
+0.74 pp for LR8-66HVD-645M
Power density
238.8 Wp/m²
231.4 Wp/m²
+7.4 Wp/m² for LR8-66HVD-645M
Open-circuit voltage
49.62 V
48.40 V
1.22 V apart
Voltage at max power
40.88 V
41.10 V
Effectively the same
Short-circuit current
16.46 A
15.96 A
0.50 A apart
Current at max power
15.78 A
14.96 A
0.82 A apart
Temperature
Temperature coefficient
-0.260 %/°C
-0.290 %/°C
+0.030 %/°C for LR8-66HVD-645M
Mechanical
Dimensions
2382x1134x30 mm
2382x1134x30 mm
Same
Module area
2.701 m²
2.701 m²
Same
Weight
33.5 kg
32.5 kg
-1.0 kg for DHN-66Z20/DG(BW)-625W
Weight per kWp
51.9 kg/kWp
52.0 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
15 yrs
15 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.35 %/yr
-
Not published by DAH Solar
Technology
Cell technology
Back Contact
TOPCon
Back Contact vs TOPCon
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
132
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#394
vs
#1,509
LR8-66HVD-645M leads by 1,115 places
Power density
#356
vs
#1,513
LR8-66HVD-645M leads by 1,157 places
Heat behaviour
#511
vs
#2,165
LR8-66HVD-645M leads by 1,654 places
Weight
#5,361
vs
#5,417
LR8-66HVD-645M leads by 56 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,084
vs
#1,833
LR8-66HVD-645M leads by 749 places
05
Open the full database
More useful comparisons
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Longi Solar LR8-66HVD-645M vs Longi Solar LR8-66HVD-665M
3 differences, the largest is module efficiency
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Longi Solar LR8-66HVD-645M vs Longi Solar LR8-66HVD-660M
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Longi Solar LR8-66HVD-645M vs Longi Solar LR8-66HVD-655M
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Longi Solar LR8-66HVD-645M vs Longi Solar LR8-66HVD-650M
The same specification on paper
Same series, other bin
Longi Solar LR8-66HVD-645M vs Longi Solar LR8-66HVD-640M
The same specification on paper
Same series, other bin
DAH Solar
DAH Solar DHN-66Z20/DG(BW)-625W vs DAH Solar DHN-66Z20/DG(BW)-620W
The same specification on paper
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: Longi Solar LR8-66HVD-645M or DAH Solar DHN-66Z20/DG(BW)-625W?
According to our database: Longi Solar LR8-66HVD-645M has higher module efficiency (23.88% vs 23.14%); Longi Solar LR8-66HVD-645M tolerates heat better (temp coeff -0.260%/°C vs -0.290%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR8-66HVD-645M and DAH Solar DHN-66Z20/DG(BW)-625W?
Longi Solar LR8-66HVD-645M has a module efficiency of 23.88%, while DAH Solar DHN-66Z20/DG(BW)-625 W is 23.14%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR8-66HVD-645M use vs DAH Solar DHN-66Z20/DG(BW)-625W?
Longi Solar LR8-66HVD-645M uses Back Contact cells; DAH Solar DHN-66Z20/DG(BW)-625 W uses TOPCon. 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 LR8-66HVD-645M and DAH Solar DHN-66Z20/DG(BW)-625W?
Longi Solar LR8-66HVD-645M has a 30 years power warranty; DAH Solar DHN-66Z20/DG(BW)-625 W 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 LR8-66HVD-645M and DAH Solar DHN-66Z20/DG(BW)-625W bifacial panels?
Both Longi Solar LR8-66HVD-645M and DAH Solar DHN-66Z20/DG(BW)-625 W 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 181 Longi Solar offers · See 10 DAH 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.