620W vs 590W 12 of 18 identical Swap Change panels

DAH Solar DHN-66Z20/DG(BW)-620W vs DAH Solar DHN-66Z20/DG(BW)-590W

Q: Which panel is better: DAH Solar DHN-66Z20/DG(BW)-620W or DAH Solar DHN-66Z20/DG(BW)-590W?

According to our database: DAH Solar DHN-66Z20/DG(BW)-620W has higher module efficiency (22.96% vs 21.84%). See the full spec comparison and 30-year energy simulation above for a complete picture.

Q: What is the efficiency of DAH Solar DHN-66Z20/DG(BW)-620W and DAH Solar DHN-66Z20/DG(BW)-590W?

DAH Solar DHN-66Z20/DG(BW)-620W has a module efficiency of 22.96%, while DAH Solar DHN-66Z20/DG(BW)-590W is 21.84%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does DAH Solar DHN-66Z20/DG(BW)-620W use vs DAH Solar DHN-66Z20/DG(BW)-590W?

DAH Solar DHN-66Z20/DG(BW)-620W uses TOPCon cells; DAH Solar DHN-66Z20/DG(BW)-590W uses TOPCon. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.

Q: What is the warranty on DAH Solar DHN-66Z20/DG(BW)-620W and DAH Solar DHN-66Z20/DG(BW)-590W?

DAH Solar DHN-66Z20/DG(BW)-620W has a 30 years power warranty; DAH Solar DHN-66Z20/DG(BW)-590W 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.

Q: Are DAH Solar DHN-66Z20/DG(BW)-620W and DAH Solar DHN-66Z20/DG(BW)-590W bifacial panels?

Both DAH Solar DHN-66Z20/DG(BW)-620W and DAH Solar DHN-66Z20/DG(BW)-590W 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.

DAH Solar

DHN-66Z20/DG(BW)-620W

620 Wp 22.96 % TOPCon Bifacial Incomplete

Open panel page Datasheet PDF

DAH Solar

DHN-66Z20/DG(BW)-590W

590 Wp 21.84 % TOPCon Bifacial Incomplete

Open panel page Datasheet PDF

The verdict

620W leads on the differences that matter

The largest is module efficiency: 1.12 pp more efficient. 12 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 6 differences

How alike are they

12 of 18 comparable
parameters are identical

identical differs not published

What actually differs

6 of 18 parameters

Parameter 620W 590W Difference

Module efficiency 22.96 % 21.84 % 1.12 pp more efficient

Power density 229.5 Wp/m² 218.4 Wp/m² 11.1 Wp/m² higher

Rated power 620 Wp 590 Wp 30 W more power

Weight per kWp 52.4 kg/kWp 55.1 kg/kWp 2.7 kg/kWp lighter

Open-circuit voltage 48.20 V 47.20 V 1.00 V apart

Voltage at max power 40.80 V 39.70 V 1.10 V apart

What it means on a roof

Thirty years of production

Declared first-year losses, with 0.40% a year afterwards assumed for both panels, at 1,200 kWh/kWp a year

Cell temperature

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.

620W

20,802 kWh

590W

19,796 kWh

Lifetime gap

1,006 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario 620W 590W

Standard test conditions 25 °C 100.0% of rated power 620 W 590 W

Cool, bright day 40 °C 95.7% of rated power 593 W 564 W

Typical summer roof 55 °C 91.3% of rated power 566 W 539 W

Hot roof 70 °C 87.0% of rated power 539 W 513 W

Full specification

Parameter 620W 590W Difference

Power and efficiency

Rated power 620 Wp 590 Wp +30 W for 620W

Module efficiency 22.96 % 21.84 % +1.12 pp for 620W

Power density 229.5 Wp/m² 218.4 Wp/m² +11.1 Wp/m² for 620W

Open-circuit voltage 48.20 V 47.20 V 1.00 V apart

Voltage at max power 40.80 V 39.70 V 1.10 V apart

Short-circuit current 15.74 A 15.62 A Effectively the same

Current at max power 14.93 A 14.71 A Effectively the same

Temperature

Temperature coefficient -0.290 %/°C -0.290 %/°C Same

Mechanical

Dimensions 2382x1134x30 mm 2382x1134x30 mm Same

Module area 2.701 m² 2.701 m² Same

Weight 32.5 kg 32.5 kg Same

Weight per kWp 52.4 kg/kWp 55.1 kg/kWp -2.7 kg/kWp for 620W

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 132 132 Same

Bifacial Yes Yes Same

Against the whole database

14,005 panels

Efficiency

#2,260 vs #6,985

620W leads by 4,725 places

Power density

#2,191 vs #6,954

620W leads by 4,763 places

Heat behaviour

#2,165 vs #2,165

Tied - the same position in the database

Weight

#5,893 vs #9,503

620W leads by 3,610 places

Warranty

#21 vs #21

Tied - the same position in the database

Overall

#2,098 vs #4,277

620W leads by 2,179 places

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Written summary

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Questions about this pairing

Which panel is better: DAH Solar DHN-66Z20/DG(BW)-620W or DAH Solar DHN-66Z20/DG(BW)-590W?

According to our database: DAH Solar DHN-66Z20/DG(BW)-620 W has higher module efficiency (22.96% vs 21.84%). See the full spec comparison and 30-year energy simulation above for a complete picture.

What is the efficiency of DAH Solar DHN-66Z20/DG(BW)-620W and DAH Solar DHN-66Z20/DG(BW)-590W?

DAH Solar DHN-66Z20/DG(BW)-620 W has a module efficiency of 22.96%, while DAH Solar DHN-66Z20/DG(BW)-590 W is 21.84%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

What cell technology does DAH Solar DHN-66Z20/DG(BW)-620W use vs DAH Solar DHN-66Z20/DG(BW)-590W?

DAH Solar DHN-66Z20/DG(BW)-620 W uses TOPCon cells; DAH Solar DHN-66Z20/DG(BW)-590 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-66Z20/DG(BW)-620W and DAH Solar DHN-66Z20/DG(BW)-590W?

DAH Solar DHN-66Z20/DG(BW)-620 W has a 30 years power warranty; DAH Solar DHN-66Z20/DG(BW)-590 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-66Z20/DG(BW)-620W and DAH Solar DHN-66Z20/DG(BW)-590W bifacial panels?

Both DAH Solar DHN-66Z20/DG(BW)-620 W and DAH Solar DHN-66Z20/DG(BW)-590 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.