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640W vs 645W 17 of 18 identical Swap Change panels

DAS Solar DAS-DH156NA-640W vs DAS Solar DAS-DH156NA-645W

DAS Solar DAS-DH156NA-640W
DAS Solar
DAS-DH156NA-640W
640 Wp 22.90 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
DAS Solar DAS-DH156NA-645W
DAS Solar
DAS-DH156NA-645W
645 Wp 23.10 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

645W leads on the differences that matter

The largest is module efficiency: 0.20 pp more efficient. 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 640W 645W Difference
Module efficiency 22.90 % 23.10 % 0.20 pp more efficient
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 (-0.300 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
640W
21,473 kWh
645W
21,641 kWh
Lifetime gap
168 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 640W 645W
Standard test conditions 25 °C 100.0% of rated power 640 W 645 W
Cool, bright day 40 °C 95.5% of rated power 611 W 616 W
Typical summer roof 55 °C 91.0% of rated power 582 W 587 W
Hot roof 70 °C 86.5% of rated power 554 W 558 W
03

Full specification

Parameter 640W 645W Difference
Power and efficiency
Rated power 640 Wp 645 Wp Effectively the same
Module efficiency 22.90 % 23.10 % +0.20 pp for 645W
Power density 229.0 Wp/m² 230.7 Wp/m² Effectively the same
Open-circuit voltage 56.18 V 56.36 V Effectively the same
Voltage at max power 46.59 V 46.78 V Effectively the same
Short-circuit current 14.48 A 14.53 A Effectively the same
Current at max power 13.74 A 13.79 A Effectively the same
Temperature
Temperature coefficient -0.300 %/°C -0.300 %/°C Same
Mechanical
Dimensions 2465x1134x30 mm 2465x1134x30 mm Same
Module area 2.795 m² 2.795 m² Same
Weight 34.3 kg 34.3 kg Same
Weight per kWp 53.6 kg/kWp 53.2 kg/kWp Effectively the same
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count - - Neither datasheet publishes this
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#2,359 vs #1,570
645W leads by 789 places
Power density
#2,389 vs #1,654
645W leads by 735 places
Heat behaviour
#6,093 vs #6,093
Tied - the same position in the database
Weight
#7,600 vs #7,008
645W leads by 592 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,704 vs #1,496
645W leads by 208 places
05

More useful comparisons

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DAS Solar DAS-DH156NA-640W vs DAS Solar DAS-DH156NA-630W
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DAS Solar DAS-DH156NA-640W vs DAS Solar DAS-DH132NC-715
9 differences, the largest is rated power
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9 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: DAS Solar DAS-DH156NA-640W or DAS Solar DAS-DH156NA-645W?
According to our database: DAS Solar DAS-DH156NA-645 W has higher module efficiency (23.10% vs 22.90%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of DAS Solar DAS-DH156NA-640W and DAS Solar DAS-DH156NA-645W?
DAS Solar DAS-DH156NA-640 W has a module efficiency of 22.90%, while DAS Solar DAS-DH156NA-645 W is 23.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does DAS Solar DAS-DH156NA-640W use vs DAS Solar DAS-DH156NA-645W?
DAS Solar DAS-DH156NA-640 W uses TOPCon cells; DAS Solar DAS-DH156NA-645 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 DAS Solar DAS-DH156NA-640W and DAS Solar DAS-DH156NA-645W?
DAS Solar DAS-DH156NA-640 W has a 30 years power warranty; DAS Solar DAS-DH156NA-645 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 DAS Solar DAS-DH156NA-640W and DAS Solar DAS-DH156NA-645W bifacial panels?
Both DAS Solar DAS-DH156NA-640 W and DAS Solar DAS-DH156NA-645 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 4 DAS 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.