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640 vs 635W 17 of 18 identical Swap Change panels

DAH Solar DHN-78X16/DG-640 vs DAH Solar DHN-78X16/DG-635W

DAH Solar
DHN-78X16/DG-640
640 Wp 22.90 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
DAH Solar
DHN-78X16/DG-635W
635 Wp 22.72 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

One difference, none of them an advantage

The largest is dimensions: 2465x1134x30 mm vs 2465x1134x34 mm. 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 640 635W Difference
Dimensions 2465x1134x30 mm 2465x1134x34 mm 2465x1134x30 mm vs 2465x1134x34 mm
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.
640
21,473 kWh
635W
21,306 kWh
Lifetime gap
167 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 640 635W
Standard test conditions 25 °C 100.0% of rated power 640 W 635 W
Cool, bright day 40 °C 95.7% of rated power 612 W 607 W
Typical summer roof 55 °C 91.3% of rated power 584 W 580 W
Hot roof 70 °C 87.0% of rated power 556 W 552 W
03

Full specification

Parameter 640 635W Difference
Power and efficiency
Rated power 640 Wp 635 Wp Effectively the same
Module efficiency 22.90 % 22.72 % Effectively the same
Power density 229.0 Wp/m² 227.2 Wp/m² Effectively the same
Open-circuit voltage 56.40 V 56.20 V Effectively the same
Voltage at max power 47.60 V 47.40 V Effectively the same
Short-circuit current 14.32 A 14.26 A Effectively the same
Current at max power 13.45 A 13.40 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2465x1134x30 mm 2465x1134x34 mm 2465x1134x30 mm vs 2465x1134x34 mm
Module area 2.795 m² 2.795 m² Same
Weight 34.2 kg 34.2 kg Same
Weight per kWp 53.4 kg/kWp 53.9 kg/kWp Effectively the same
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr - Not published by DAH Solar
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
#2,359 vs #3,245
640 leads by 886 places
Power density
#2,389 vs #3,252
640 leads by 863 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#7,363 vs #8,005
640 leads by 642 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,704 vs #1,909
640 leads by 205 places
05

More useful comparisons

Open the full database
Same series, other bin
DAH Solar
DAH Solar DHN-78X16/DG-640 vs DAH Solar DHN-78X16/DG-640W
One difference: dimensions
Same series, other bin
DAH Solar
DAH Solar DHN-78X16/DG-640 vs DAH Solar DHN-78X16/DG-635
The same specification on paper
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DAH Solar DHN-78X16/DG-640 vs DAH Solar DHN-78X16/DG-630W
4 differences, the largest is module efficiency
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DAH Solar DHN-78X16/DG-640 vs DAH Solar DHN-78X16/DG-630
3 differences, the largest is module efficiency
Same series, other bin
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DAH Solar DHN-78X16/DG-640 vs DAH Solar DHN-78X16/DG-625W
4 differences, the largest is module efficiency
Same series, other bin
DAH Solar
DAH Solar DHN-78X16/DG-640 vs DAH Solar DHN-78X16/DG-625
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: DAH Solar DHN-78X16/DG-640 or DAH Solar DHN-78X16/DG-635W?
According to our database: DAH Solar DHN-78X16/DG-640 has higher module efficiency (22.90% vs 22.72%). 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-640 and DAH Solar DHN-78X16/DG-635W?
DAH Solar DHN-78X16/DG-640 has a module efficiency of 22.90%, while DAH Solar DHN-78X16/DG-635 W is 22.72%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does DAH Solar DHN-78X16/DG-640 use vs DAH Solar DHN-78X16/DG-635W?
DAH Solar DHN-78X16/DG-640 uses TOPCon cells; DAH Solar DHN-78X16/DG-635 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-640 and DAH Solar DHN-78X16/DG-635W?
DAH Solar DHN-78X16/DG-640 has a 30 years power warranty; DAH Solar DHN-78X16/DG-635 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-640 and DAH Solar DHN-78X16/DG-635W bifacial panels?
Both DAH Solar DHN-78X16/DG-640 and DAH Solar DHN-78X16/DG-635 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 12 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.