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630 vs 640 16 of 19 identical Swap Change panels

DAH Solar DHN-78X16/DG-630 vs DAH Solar DHN-78X16/DG-640

DAH Solar
DHN-78X16/DG-630
630 Wp 22.54 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
DAH Solar
DHN-78X16/DG-640
640 Wp 22.90 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

640 leads on the differences that matter

The largest is module efficiency: 0.36 pp more efficient. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter 630 640 Difference
Module efficiency 22.54 % 22.90 % 0.36 pp more efficient
Power density 225.4 Wp/m² 229.0 Wp/m² 3.6 Wp/m² higher
Rated power 630 Wp 640 Wp 10 W more power
02

What it means on a roof

Thirty years of production
Each panel's own declared degradation curve, 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.
630
21,138 kWh
640
21,473 kWh
Lifetime gap
335 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 630 640
Standard test conditions 25 °C 100.0% of rated power 630 W 640 W
Cool, bright day 40 °C 95.7% of rated power 603 W 612 W
Typical summer roof 55 °C 91.3% of rated power 575 W 584 W
Hot roof 70 °C 87.0% of rated power 548 W 556 W
03

Full specification

Parameter 630 640 Difference
Power and efficiency
Rated power 630 Wp 640 Wp +10 W for 640
Module efficiency 22.54 % 22.90 % +0.36 pp for 640
Power density 225.4 Wp/m² 229.0 Wp/m² +3.6 Wp/m² for 640
Open-circuit voltage 56.00 V 56.40 V Effectively the same
Voltage at max power 47.20 V 47.60 V Effectively the same
Short-circuit current 14.20 A 14.32 A Effectively the same
Current at max power 13.35 A 13.45 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2465x1134x30 mm 2465x1134x30 mm Same
Module area 2.795 m² 2.795 m² Same
Weight 34.2 kg 34.2 kg Same
Weight per kWp 54.3 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 0.40 %/yr 0.40 %/yr Same
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
#3,920 vs #2,359
640 leads by 1,561 places
Power density
#3,907 vs #2,389
640 leads by 1,518 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#8,524 vs #7,363
640 leads by 1,161 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,179 vs #1,704
640 leads by 475 places
05

More useful comparisons

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

Written summary

07

Questions about this pairing

Which panel is better: DAH Solar DHN-78X16/DG-630 or DAH Solar DHN-78X16/DG-640?
According to our database: DAH Solar DHN-78X16/DG-640 has higher module efficiency (22.90% vs 22.54%). 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-630 and DAH Solar DHN-78X16/DG-640?
DAH Solar DHN-78X16/DG-630 has a module efficiency of 22.54%, while DAH Solar DHN-78X16/DG-640 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-630 use vs DAH Solar DHN-78X16/DG-640?
DAH Solar DHN-78X16/DG-630 uses TOPCon cells; DAH Solar DHN-78X16/DG-640 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-630 and DAH Solar DHN-78X16/DG-640?
DAH Solar DHN-78X16/DG-630 has a 30 years power warranty; DAH Solar DHN-78X16/DG-640 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-630 and DAH Solar DHN-78X16/DG-640 bifacial panels?
Both DAH Solar DHN-78X16/DG-630 and DAH Solar DHN-78X16/DG-640 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.