--- title: "DAH Solar DHN-66Z20/DG(BW)-595W vs DAH Solar DHN-66Z20/DG(BW)-615W - Solar Panel Comparison | ComparePV" description: "Compare DAH Solar DHN-66Z20/DG(BW)-595W vs DAH Solar DHN-66Z20/DG(BW)-615W 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-595w/dah-dhn-66z20-dg-bw-615w" updated: 2026-09-11 --- # DAH Solar DHN-66Z20/DG(BW)-595W vs DAH Solar DHN-66Z20/DG(BW)-615W 615W leads on the differences that matter The largest is module efficiency: 0.74 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)-595W](https://comparepv.com/panel/dah-dhn-66z20-dg-bw-595w) | [DAH Solar DHN-66Z20/DG(BW)-615W](https://comparepv.com/panel/dah-dhn-66z20-dg-bw-615w) | | Manufacturer | DAH Solar | DAH Solar | | Power | 595 Wp | 615 Wp | | Efficiency | 22.03 % | 22.77 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 595W | 615W | Difference | | --- | --- | --- | --- | | Module efficiency | 22.03 % | 22.77 % | +0.74 pp for 615W | | Power density | 220.3 Wp/m² | 227.7 Wp/m² | +7.4 Wp/m² for 615W | | Rated power | 595 Wp | 615 Wp | +20 W for 615W | ## Every compared parameter | Parameter | 595W | 615W | | --- | --- | --- | | Rated power | 595 Wp | 615 Wp | | Module efficiency | 22.03 % | 22.77 % | | Power density | 220.3 Wp/m² | 227.7 Wp/m² | | Open-circuit voltage | 47.40 V | 48.00 V | | Voltage at max power | 40.10 V | 40.60 V | | Short-circuit current | 15.64 A | 15.72 A | | Current at max power | 14.77 A | 14.91 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 | 54.6 kg/kWp | 52.8 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, 595W:** 19,963 kWh - **Cumulative output, 615W:** 20,634 kWh - **Gap:** 671 kWh ## Output when hot | Condition | Cell temperature | 595W | 615W | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 595 W | 615 W | 100.0% of rated power | | Cool, bright day | 40 °C | 569 W | 588 W | 95.7% of rated power | | Typical summer roof | 55 °C | 543 W | 561 W | 91.3% of rated power | | Hot roof | 70 °C | 517 W | 535 W | 87.0% of rated power | ## Against the whole database | Measure | 595W | 615W | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #6,306 | #3,073 | 14,005 | 615W leads by 3,233 places | | Power density | #6,299 | #3,077 | 14,005 | 615W leads by 3,222 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #8,977 | #6,546 | 14,005 | 615W leads by 2,431 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #3,905 | #2,365 | 14,005 | 615W leads by 1,540 places | ## Questions ### Which panel is better: DAH Solar DHN-66Z20/DG(BW)-595W or DAH Solar DHN-66Z20/DG(BW)-615W? According to our database: **DAH Solar DHN-66Z20/DG(BW)-**615 W**** has higher module efficiency (**22.77%** vs **22.03%**). 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)-595W and DAH Solar DHN-66Z20/DG(BW)-615W? **DAH Solar DHN-66Z20/DG(BW)-**595 W**** has a module efficiency of **22.03%**, while **DAH Solar DHN-66Z20/DG(BW)-**615 W**** is **22.77%**. 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)-595W use vs DAH Solar DHN-66Z20/DG(BW)-615W? **DAH Solar DHN-66Z20/DG(BW)-**595 W**** uses **TOPCon** cells; **DAH Solar DHN-66Z20/DG(BW)-**615 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)-595W and DAH Solar DHN-66Z20/DG(BW)-615W? **DAH Solar DHN-66Z20/DG(BW)-**595 W**** has a **30 years** power warranty; **DAH Solar DHN-66Z20/DG(BW)-**615 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)-595W and DAH Solar DHN-66Z20/DG(BW)-615W bifacial panels? Both **DAH Solar DHN-66Z20/DG(BW)-**595 W**** and **DAH Solar DHN-66Z20/DG(BW)-**615 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)-595W vs DAH Solar DHN-66Z20/DG(BW)-625W](https://comparepv.com/compare/dah-dhn-66z20-dg-bw-595w/dah-dhn-66z20-dg-bw-625w) - 6 differences, the largest is module efficiency - [DAH Solar DHN-66Z20/DG(BW)-595W vs DAH Solar DHN-66Z20/DG(BW)-620W](https://comparepv.com/compare/dah-dhn-66z20-dg-bw-595w/dah-dhn-66z20-dg-bw-620w) - 4 differences, the largest is module efficiency - [DAH Solar DHN-66Z20/DG(BW)-595W vs DAH Solar DHN-66Z20/DG(BW)-610W](https://comparepv.com/compare/dah-dhn-66z20-dg-bw-595w/dah-dhn-66z20-dg-bw-610w) - 3 differences, the largest is module efficiency - [DAH Solar DHN-66Z20/DG(BW)-595W vs DAH Solar DHN-66Z20/DG(BW)-605W](https://comparepv.com/compare/dah-dhn-66z20-dg-bw-595w/dah-dhn-66z20-dg-bw-605w) - 3 differences, the largest is module efficiency - [DAH Solar DHN-66Z20/DG(BW)-595W vs DAH Solar DHN-66Z20/DG(BW)-600W](https://comparepv.com/compare/dah-dhn-66z20-dg-bw-595w/dah-dhn-66z20-dg-bw-600w) - The same specification on paper - [DAH Solar DHN-66Z20/DG(BW)-595W vs DAH Solar DHN-66Z20/DG(BW)-590W](https://comparepv.com/compare/dah-dhn-66z20-dg-bw-595w/dah-dhn-66z20-dg-bw-590w) - The same specification on paper --- Source: https://comparepv.com/compare/dah-dhn-66z20-dg-bw-595w/dah-dhn-66z20-dg-bw-615w 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.