--- title: "DAH Solar DHN-66Z20/DG(BW)-590W vs DAH Solar DHN-66Z20/DG(BW)-605W - Solar Panel Comparison | ComparePV" description: "Compare DAH Solar DHN-66Z20/DG(BW)-590W vs DAH Solar DHN-66Z20/DG(BW)-605W side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/dah-dhn-66z20-dg-bw-590w/dah-dhn-66z20-dg-bw-605w" updated: 2026-09-11 --- # DAH Solar DHN-66Z20/DG(BW)-590W vs DAH Solar DHN-66Z20/DG(BW)-605W 605W leads on the differences that matter The largest is module efficiency: 0.56 pp more efficient. 15 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [DAH Solar DHN-66Z20/DG(BW)-590W](https://comparepv.com/panel/dah-dhn-66z20-dg-bw-590w) | [DAH Solar DHN-66Z20/DG(BW)-605W](https://comparepv.com/panel/dah-dhn-66z20-dg-bw-605w) | | Manufacturer | DAH Solar | DAH Solar | | Power | 590 Wp | 605 Wp | | Efficiency | 21.84 % | 22.40 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 590W | 605W | Difference | | --- | --- | --- | --- | | Module efficiency | 21.84 % | 22.40 % | +0.56 pp for 605W | | Power density | 218.4 Wp/m² | 224.0 Wp/m² | +5.6 Wp/m² for 605W | | Rated power | 590 Wp | 605 Wp | +15 W for 605W | ## Every compared parameter | Parameter | 590W | 605W | | --- | --- | --- | | Rated power | 590 Wp | 605 Wp | | Module efficiency | 21.84 % | 22.40 % | | Power density | 218.4 Wp/m² | 224.0 Wp/m² | | Open-circuit voltage | 47.20 V | 47.60 V | | Voltage at max power | 39.70 V | 40.30 V | | Short-circuit current | 15.62 A | 15.67 A | | Current at max power | 14.71 A | 14.81 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2382x1134x30 mm | 2382x1134x30 mm | | Module area | 2.701 m² | 2.701 m² | | Weight | 32.5 kg | 32.5 kg | | Weight per kWp | 55.1 kg/kWp | 53.7 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | - | - | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | Bifacial | Yes | Yes | ## Thirty-year yield Declared first-year losses, with 0.40% a year afterwards 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. - **Cumulative output, 590W:** 19,796 kWh - **Cumulative output, 605W:** 20,299 kWh - **Gap:** 503 kWh ## Output when hot | Condition | Cell temperature | 590W | 605W | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 590 W | 605 W | 100.0% of rated power | | Cool, bright day | 40 °C | 564 W | 579 W | 95.7% of rated power | | Typical summer roof | 55 °C | 539 W | 552 W | 91.3% of rated power | | Hot roof | 70 °C | 513 W | 526 W | 87.0% of rated power | ## Against the whole database | Measure | 590W | 605W | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #6,985 | #4,774 | 14,005 | 605W leads by 2,211 places | | Power density | #6,954 | #4,780 | 14,005 | 605W leads by 2,174 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #9,503 | #7,739 | 14,005 | 605W leads by 1,764 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #4,277 | #3,064 | 14,005 | 605W leads by 1,213 places | ## Questions ### Which panel is better: DAH Solar DHN-66Z20/DG(BW)-590W or DAH Solar DHN-66Z20/DG(BW)-605W? According to our database: **DAH Solar DHN-66Z20/DG(BW)-**605 W**** has higher module efficiency (**22.40%** 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)-590W and DAH Solar DHN-66Z20/DG(BW)-605W? **DAH Solar DHN-66Z20/DG(BW)-**590 W**** has a module efficiency of **21.84%**, while **DAH Solar DHN-66Z20/DG(BW)-**605 W**** is **22.40%**. 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)-590W use vs DAH Solar DHN-66Z20/DG(BW)-605W? **DAH Solar DHN-66Z20/DG(BW)-**590 W**** uses **TOPCon** cells; **DAH Solar DHN-66Z20/DG(BW)-**605 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)-590W and DAH Solar DHN-66Z20/DG(BW)-605W? **DAH Solar DHN-66Z20/DG(BW)-**590 W**** has a **30 years** power warranty; **DAH Solar DHN-66Z20/DG(BW)-**605 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)-590W and DAH Solar DHN-66Z20/DG(BW)-605W bifacial panels? Both **DAH Solar DHN-66Z20/DG(BW)-**590 W**** and **DAH Solar DHN-66Z20/DG(BW)-**605 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. ## Related comparisons - [DAH Solar DHN-66Z20/DG(BW)-590W vs DAH Solar DHN-66Z20/DG(BW)-625W](https://comparepv.com/compare/dah-dhn-66z20-dg-bw-590w/dah-dhn-66z20-dg-bw-625w) - 6 differences, the largest is module efficiency - [DAH Solar DHN-66Z20/DG(BW)-590W vs DAH Solar DHN-66Z20/DG(BW)-620W](https://comparepv.com/compare/dah-dhn-66z20-dg-bw-590w/dah-dhn-66z20-dg-bw-620w) - 6 differences, the largest is module efficiency - [DAH Solar DHN-66Z20/DG(BW)-590W vs DAH Solar DHN-66Z20/DG(BW)-615W](https://comparepv.com/compare/dah-dhn-66z20-dg-bw-590w/dah-dhn-66z20-dg-bw-615w) - 4 differences, the largest is module efficiency - [DAH Solar DHN-66Z20/DG(BW)-590W vs DAH Solar DHN-66Z20/DG(BW)-610W](https://comparepv.com/compare/dah-dhn-66z20-dg-bw-590w/dah-dhn-66z20-dg-bw-610w) - 3 differences, the largest is module efficiency - [DAH Solar DHN-66Z20/DG(BW)-590W vs DAH Solar DHN-66Z20/DG(BW)-600W](https://comparepv.com/compare/dah-dhn-66z20-dg-bw-590w/dah-dhn-66z20-dg-bw-600w) - 3 differences, the largest is module efficiency - [DAH Solar DHN-66Z20/DG(BW)-590W vs DAH Solar DHN-66Z20/DG(BW)-595W](https://comparepv.com/compare/dah-dhn-66z20-dg-bw-590w/dah-dhn-66z20-dg-bw-595w) - The same specification on paper --- Source: https://comparepv.com/compare/dah-dhn-66z20-dg-bw-590w/dah-dhn-66z20-dg-bw-605w Not in this file, on the page: the thirty-year yield curve year by year at a cell temperature you pick and a written summary generated on request.