DAH Solar DHN-78X16/DG-635W vs DAH Solar DHN-78X16/DG-640W
VS
The verdict
Identical on every published parameter
All 18 comparable parameters agree, with 1 more left out because at least one datasheet does not publish it. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from.
How alike are they
18
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
0 of 18 parameters
What actually differs
Every comparable parameter agrees. The full specification is below.
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
640W
21,473 kWh
Lifetime gap
167 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
635W
640W
Standard test conditions
25 °C
100.0% of rated power
635 W
640 W
Cool, bright day
40 °C
95.7% of rated power
607 W
612 W
Typical summer roof
55 °C
91.3% of rated power
580 W
584 W
Hot roof
70 °C
87.0% of rated power
552 W
556 W
03
Full specification
Parameter
635W
640W
Difference
Power and efficiency
Rated power
635 Wp
640 Wp
Effectively the same
Module efficiency
22.72 %
22.90 %
Effectively the same
Power density
227.2 Wp/m²
229.0 Wp/m²
Effectively the same
Open-circuit voltage
56.20 V
56.40 V
Effectively the same
Voltage at max power
47.40 V
47.60 V
Effectively the same
Short-circuit current
14.26 A
14.32 A
Effectively the same
Current at max power
13.40 A
13.45 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
53.4 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
156
156
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#3,245
vs
#2,359
640W leads by 886 places
Power density
#3,252
vs
#2,389
640W leads by 863 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#8,005
vs
#7,363
640W leads by 642 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,909
vs
#1,704
640W leads by 205 places
05
Open the full database
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06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: DAH Solar DHN-78X16/DG-635W or DAH Solar DHN-78X16/DG-640W?
According to our database: DAH Solar DHN-78X16/DG-640 W 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-635W and DAH Solar DHN-78X16/DG-640W?
DAH Solar DHN-78X16/DG-635 W has a module efficiency of 22.72%, while DAH Solar DHN-78X16/DG-640 W is 22.90%. 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-640W?
DAH Solar DHN-78X16/DG-635 W uses TOPCon cells; DAH Solar DHN-78X16/DG-640 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-640W?
DAH Solar DHN-78X16/DG-635 W has a 30 years power warranty; DAH Solar DHN-78X16/DG-640 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-640W bifacial panels?
Both DAH Solar DHN-78X16/DG-635 W and DAH Solar DHN-78X16/DG-640 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 11 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.