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DHN-66Z20/DG(BW)-625W vs LR8-66HVD-645M 9 of 18 identical Swap Change panels

DAH Solar DHN-66Z20/DG(BW)-625W vs Longi Solar LR8-66HVD-645M

DAH Solar
DHN-66Z20/DG(BW)-625W
625 Wp 23.14 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
VS
Longi Solar LR8-66HVD-645M
LR8-66HVD-645M
645 Wp 23.88 % Back Contact Bifacial
Open panel page Datasheet PDF
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 differences
How alike are they
9 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

9 of 18 parameters
Parameter DHN-66Z20/DG(BW)-625W LR8-66HVD-645M Difference
Module efficiency 23.14 % 23.88 % 0.74 pp more efficient
Temperature coefficient -0.290 %/°C -0.260 %/°C 0.030 %/°C better in heat
Power density 231.4 Wp/m² 238.8 Wp/m² 7.4 Wp/m² higher
Rated power 625 Wp 645 Wp 20 W more power
Cell technology TOPCon Back Contact TOPCon vs Back Contact
Weight 32.5 kg 33.5 kg 1.0 kg lighter
Open-circuit voltage 48.40 V 49.62 V 1.22 V apart
Short-circuit current 15.96 A 16.46 A 0.50 A apart
Current at max power 14.96 A 15.78 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
DHN-66Z20/DG(BW)-625W
20,970 kWh
LR8-66HVD-645M
21,641 kWh
Lifetime gap
671 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario DHN-66Z20/DG(BW)-625W LR8-66HVD-645M
Standard test conditions 25 °C 100.0% of rated power 625 W 645 W
Cool, bright day 40 °C 95.7% of rated power 598 W 620 W
Typical summer roof 55 °C 91.3% of rated power 571 W 595 W
Hot roof 70 °C 87.0% of rated power 543 W 570 W
03

Full specification

Parameter DHN-66Z20/DG(BW)-625W LR8-66HVD-645M Difference
Power and efficiency
Rated power 625 Wp 645 Wp +20 W for LR8-66HVD-645M
Module efficiency 23.14 % 23.88 % +0.74 pp for LR8-66HVD-645M
Power density 231.4 Wp/m² 238.8 Wp/m² +7.4 Wp/m² for LR8-66HVD-645M
Open-circuit voltage 48.40 V 49.62 V 1.22 V apart
Voltage at max power 41.10 V 40.88 V Effectively the same
Short-circuit current 15.96 A 16.46 A 0.50 A apart
Current at max power 14.96 A 15.78 A 0.82 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.260 %/°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 32.5 kg 33.5 kg -1.0 kg for DHN-66Z20/DG(BW)-625W
Weight per kWp 52.0 kg/kWp 51.9 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 TOPCon Back Contact TOPCon vs Back Contact
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#1,509 vs #394
LR8-66HVD-645M leads by 1,115 places
Power density
#1,513 vs #356
LR8-66HVD-645M leads by 1,157 places
Heat behaviour
#2,165 vs #511
LR8-66HVD-645M leads by 1,654 places
Weight
#5,417 vs #5,361
LR8-66HVD-645M leads by 56 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,833 vs #1,084
LR8-66HVD-645M leads by 749 places
05

More useful comparisons

Open the full database
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DAH Solar
DAH Solar DHN-66Z20/DG(BW)-625W vs DAH Solar DHN-66Z20/DG(BW)-620W
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DAH Solar DHN-66Z20/DG(BW)-625W vs DAH Solar DHN-66Z20/DG(BW)-615W
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DAH Solar DHN-66Z20/DG(BW)-625W vs DAH Solar DHN-66Z20/DG(BW)-610W
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DAH Solar DHN-66Z20/DG(BW)-625W vs DAH Solar DHN-66Z20/DG(BW)-605W
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DAH Solar
DAH Solar DHN-66Z20/DG(BW)-625W vs DAH Solar DHN-66Z20/DG(BW)-600W
5 differences, the largest is module efficiency
Same series, other bin
DAH Solar
DAH Solar DHN-66Z20/DG(BW)-625W vs DAH Solar DHN-66Z20/DG(BW)-595W
6 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: DAH Solar DHN-66Z20/DG(BW)-625W or Longi Solar LR8-66HVD-645M?
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 DAH Solar DHN-66Z20/DG(BW)-625W and Longi Solar LR8-66HVD-645M?
DAH Solar DHN-66Z20/DG(BW)-625 W has a module efficiency of 23.14%, while Longi Solar LR8-66HVD-645M is 23.88%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does DAH Solar DHN-66Z20/DG(BW)-625W use vs Longi Solar LR8-66HVD-645M?
DAH Solar DHN-66Z20/DG(BW)-625 W uses TOPCon cells; Longi Solar LR8-66HVD-645M 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 DAH Solar DHN-66Z20/DG(BW)-625W and Longi Solar LR8-66HVD-645M?
DAH Solar DHN-66Z20/DG(BW)-625 W has a 30 years power warranty; Longi Solar LR8-66HVD-645M 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 DAH Solar DHN-66Z20/DG(BW)-625W and Longi Solar LR8-66HVD-645M bifacial panels?
Both DAH Solar DHN-66Z20/DG(BW)-625 W and Longi Solar LR8-66HVD-645M 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.
Compare DAH Solar and Longi Solar as manufacturers Portfolio, efficiency, cell technologies and warranty terms

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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.