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635W vs 620W 15 of 18 identical Swap Change panels

DAH Solar DHN-78X16/DG-635W vs DAH Solar DHN-78X16/DG-620W

DAH Solar
DHN-78X16/DG-635W
635 Wp 22.72 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
VS
DAH Solar
DHN-78X16/DG-620W
620 Wp 22.18 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

635W leads on the differences that matter

The largest is module efficiency: 0.54 pp more efficient. 15 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 3 differences
How alike are they
15 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

3 of 18 parameters
Parameter 635W 620W Difference
Module efficiency 22.72 % 22.18 % 0.54 pp more efficient
Power density 227.2 Wp/m² 221.8 Wp/m² 5.4 Wp/m² higher
Rated power 635 Wp 620 Wp 15 W more power
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.
635W
21,306 kWh
620W
20,802 kWh
Lifetime gap
504 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 635W 620W
Standard test conditions 25 °C 100.0% of rated power 635 W 620 W
Cool, bright day 40 °C 95.7% of rated power 607 W 593 W
Typical summer roof 55 °C 91.3% of rated power 580 W 566 W
Hot roof 70 °C 87.0% of rated power 552 W 539 W
03

Full specification

Parameter 635W 620W Difference
Power and efficiency
Rated power 635 Wp 620 Wp +15 W for 635W
Module efficiency 22.72 % 22.18 % +0.54 pp for 635W
Power density 227.2 Wp/m² 221.8 Wp/m² +5.4 Wp/m² for 635W
Open-circuit voltage 56.20 V 55.60 V Effectively the same
Voltage at max power 47.40 V 46.80 V Effectively the same
Short-circuit current 14.26 A 14.08 A Effectively the same
Current at max power 13.40 A 13.25 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2465x1134x34 mm 2465x1134x34 mm Same
Module area 2.795 m² 2.795 m² Same
Weight 34.2 kg 34.2 kg Same
Weight per kWp 53.9 kg/kWp 55.2 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 156 156 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#3,245 vs #5,930
635W leads by 2,685 places
Power density
#3,252 vs #5,869
635W leads by 2,617 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#8,005 vs #9,586
635W leads by 1,581 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,909 vs #2,865
635W leads by 956 places
05

More useful comparisons

Open the full database
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DAH Solar DHN-78X16/DG-635W vs DAH Solar DHN-78X16/DG-640W
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DAH Solar DHN-78X16/DG-635W vs DAH Solar DHN-78X16/DG-630W
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DAH Solar DHN-78X16/DG-635W vs DAH Solar DHN-78X16/DG-625W
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DAH Solar DHN-78X16/DG-635W vs DAH Solar DHN-66Y18/DG-725
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DAH Solar DHN-78X16/DG-635W vs DAH Solar DHN-66Y18/DG-720
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DAH Solar DHN-78X16/DG-635W vs DAH Solar DHN-66Y18/DG-715
12 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: DAH Solar DHN-78X16/DG-635W or DAH Solar DHN-78X16/DG-620W?
According to our database: DAH Solar DHN-78X16/DG-635 W has higher module efficiency (22.72% vs 22.18%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of DAH Solar DHN-78X16/DG-635W and DAH Solar DHN-78X16/DG-620W?
DAH Solar DHN-78X16/DG-635 W has a module efficiency of 22.72%, while DAH Solar DHN-78X16/DG-620 W is 22.18%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does DAH Solar DHN-78X16/DG-635W use vs DAH Solar DHN-78X16/DG-620W?
DAH Solar DHN-78X16/DG-635 W uses TOPCon cells; DAH Solar DHN-78X16/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-78X16/DG-635W and DAH Solar DHN-78X16/DG-620W?
DAH Solar DHN-78X16/DG-635 W has a 30 years power warranty; DAH Solar DHN-78X16/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-78X16/DG-635W and DAH Solar DHN-78X16/DG-620W bifacial panels?
Both DAH Solar DHN-78X16/DG-635 W and DAH Solar DHN-78X16/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.