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615Z16/DG(BW) vs 66Z16/DG-620W 17 of 18 identical Swap Change panels

DAH Solar DHN-615Z16/DG(BW) vs DAH Solar DHN-66Z16/DG-620W

DAH Solar
DHN-615Z16/DG(BW)
615 Wp 22.77 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
VS
DAH Solar DHN-66Z16/DG-620W
DAH Solar
DHN-66Z16/DG-620W
620 Wp 22.96 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

One difference, none of them an advantage

The largest is open-circuit voltage: 1.40 V apart. 17 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See the one difference
How alike are they
17 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

1 of 18 parameters
Parameter 615Z16/DG(BW) 66Z16/DG-620W Difference
Open-circuit voltage 48.20 V 49.60 V 1.40 V apart
02

What it means on a roof

Thirty years of production
A 1.0% first-year loss then 0.40% a year, assumed for both panels, at 1,200 kWh/kWp a year
Same temp coeff. for both panels (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
615Z16/DG(BW)
20,634 kWh
66Z16/DG-620W
20,802 kWh
Lifetime gap
168 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 615Z16/DG(BW) 66Z16/DG-620W
Standard test conditions 25 °C 100.0% of rated power 615 W 620 W
Cool, bright day 40 °C 95.7% of rated power 588 W 593 W
Typical summer roof 55 °C 91.3% of rated power 561 W 566 W
Hot roof 70 °C 87.0% of rated power 535 W 539 W
03

Full specification

Parameter 615Z16/DG(BW) 66Z16/DG-620W Difference
Power and efficiency
Rated power 615 Wp 620 Wp Effectively the same
Module efficiency 22.77 % 22.96 % Effectively the same
Power density 227.7 Wp/m² 229.5 Wp/m² Effectively the same
Open-circuit voltage 48.20 V 49.60 V 1.40 V apart
Voltage at max power 40.90 V 41.30 V Effectively the same
Short-circuit current 15.88 A 16.00 A Effectively the same
Current at max power 14.91 A 14.92 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°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 52.4 kg/kWp Effectively the same
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation - - Neither datasheet publishes this
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#3,129 vs #2,312
66Z16/DG-620W leads by 817 places
Power density
#3,132 vs #2,243
66Z16/DG-620W leads by 889 places
Heat behaviour
#2,220 vs #2,220
Tied - the same position in the database
Weight
#6,602 vs #5,938
66Z16/DG-620W leads by 664 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,394 vs #2,125
66Z16/DG-620W leads by 269 places
05

More useful comparisons

Open the full database
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DAH Solar DHN-615Z16/DG(BW) vs DAH Solar DHN-625Z16/DG(BW)
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DAH Solar DHN-615Z16/DG(BW) vs DAH Solar DHN-620Z16/DG(BW)
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DAH Solar DHN-615Z16/DG(BW) vs DAH Solar DHN-605Z16/DG(BW)
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DAH Solar DHN-615Z16/DG(BW) vs DAH Solar DHN-600Z16/DG(BW)
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DAH Solar DHN-615Z16/DG(BW) vs DAH Solar DHN-595Z16/DG(BW)
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: DAH Solar DHN-615Z16/DG(BW) or DAH Solar DHN-66Z16/DG-620W?
According to our database: DAH Solar DHN-66Z16/DG-620 W has higher module efficiency (22.96% vs 22.77%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of DAH Solar DHN-615Z16/DG(BW) and DAH Solar DHN-66Z16/DG-620W?
DAH Solar DHN-615Z16/DG(BW) has a module efficiency of 22.77%, while DAH Solar DHN-66Z16/DG-620 W is 22.96%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does DAH Solar DHN-615Z16/DG(BW) use vs DAH Solar DHN-66Z16/DG-620W?
DAH Solar DHN-615Z16/DG(BW) uses TOPCon cells; DAH Solar DHN-66Z16/DG-620 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 DAH Solar DHN-615Z16/DG(BW) and DAH Solar DHN-66Z16/DG-620W?
DAH Solar DHN-615Z16/DG(BW) has a 30 years power warranty; DAH Solar DHN-66Z16/DG-620 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 DAH Solar DHN-615Z16/DG(BW) and DAH Solar DHN-66Z16/DG-620W bifacial panels?
Both DAH Solar DHN-615Z16/DG(BW) and DAH Solar DHN-66Z16/DG-620 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.

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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.