--- title: "DAH Solar DHN-620Z16/DG(BW) vs DAH Solar DHN-66Z16/DG-610W - Solar Panel Comparison | ComparePV" description: "Compare DAH Solar DHN-620Z16/DG(BW) vs DAH Solar DHN-66Z16/DG-610W 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-620z16-dg-bw/dah-dhn-66z16-dg-610w" image: "https://comparepv.com/og/compare/panels/dah-dhn-620z16-dg-bw/dah-dhn-66z16-dg-610w.png" updated: 2026-09-11 --- # DAH Solar DHN-620Z16/DG(BW) vs DAH Solar DHN-66Z16/DG-610W 620Z16/DG(BW) leads on the differences that matter The largest is module efficiency: 0.38 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-620Z16/DG(BW)](https://comparepv.com/panel/dah-dhn-620z16-dg-bw) | [DAH Solar DHN-66Z16/DG-610W](https://comparepv.com/panel/dah-dhn-66z16-dg-610w) | | Manufacturer | DAH Solar | DAH Solar | | Power | 620 Wp | 610 Wp | | Efficiency | 22.96 % | 22.58 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 620Z16/DG(BW) | 66Z16/DG-610W | Difference | | --- | --- | --- | --- | | Module efficiency | 22.96 % | 22.58 % | +0.38 pp for 620Z16/DG(BW) | | Power density | 229.5 Wp/m² | 225.8 Wp/m² | +3.7 Wp/m² for 620Z16/DG(BW) | | Rated power | 620 Wp | 610 Wp | +10 W for 620Z16/DG(BW) | ## Every compared parameter | Parameter | 620Z16/DG(BW) | 66Z16/DG-610W | | --- | --- | --- | | Rated power | 620 Wp | 610 Wp | | Module efficiency | 22.96 % | 22.58 % | | Power density | 229.5 Wp/m² | 225.8 Wp/m² | | Open-circuit voltage | 48.40 V | 48.80 V | | Voltage at max power | 41.10 V | 40.90 V | | Short-circuit current | 15.94 A | 15.80 A | | Current at max power | 14.96 A | 14.90 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 | 52.4 kg/kWp | 53.3 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 A 1.0% first-year loss then 0.40% a year, 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, 620Z16/DG(BW):** 20,802 kWh - **Cumulative output, 66Z16/DG-610W:** 20,467 kWh - **Gap:** 335 kWh ## Output when hot | Condition | Cell temperature | 620Z16/DG(BW) | 66Z16/DG-610W | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 620 W | 610 W | 100.0% of rated power | | Cool, bright day | 40 °C | 593 W | 583 W | 95.7% of rated power | | Typical summer roof | 55 °C | 566 W | 557 W | 91.3% of rated power | | Hot roof | 70 °C | 539 W | 530 W | 87.0% of rated power | ## Against the whole database | Measure | 620Z16/DG(BW) | 66Z16/DG-610W | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #2,312 | #3,887 | 14,129 | 620Z16/DG(BW) leads by 1,575 places | | Power density | #2,243 | #3,788 | 14,129 | 620Z16/DG(BW) leads by 1,545 places | | Heat behaviour | #2,220 | #2,220 | 14,129 | Tied - the same position in the database | | Weight | #5,938 | #7,200 | 14,129 | 620Z16/DG(BW) leads by 1,262 places | | Warranty | #21 | #21 | 14,129 | Tied - the same position in the database | | Overall | #2,125 | #2,745 | 14,129 | 620Z16/DG(BW) leads by 620 places | ## Questions ### Which panel is better: DAH Solar DHN-620Z16/DG(BW) or DAH Solar DHN-66Z16/DG-610W? According to our database: **DAH Solar DHN-620Z16/DG(BW)** has higher module efficiency (**22.96%** vs **22.58%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of DAH Solar DHN-620Z16/DG(BW) and DAH Solar DHN-66Z16/DG-610W? **DAH Solar DHN-620Z16/DG(BW)** has a module efficiency of **22.96%**, while **DAH Solar DHN-66Z16/DG-**610 W**** is **22.58%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does DAH Solar DHN-620Z16/DG(BW) use vs DAH Solar DHN-66Z16/DG-610W? **DAH Solar DHN-620Z16/DG(BW)** uses **TOPCon** cells; **DAH Solar DHN-66Z16/DG-**610 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-620Z16/DG(BW) and DAH Solar DHN-66Z16/DG-610W? **DAH Solar DHN-620Z16/DG(BW)** has a **30 years** power warranty; **DAH Solar DHN-66Z16/DG-**610 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-620Z16/DG(BW) and DAH Solar DHN-66Z16/DG-610W bifacial panels? Both **DAH Solar DHN-620Z16/DG(BW)** and **DAH Solar DHN-66Z16/DG-**610 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-620Z16/DG(BW) vs DAH Solar DHN-625Z16/DG(BW)](https://comparepv.com/compare/dah-dhn-620z16-dg-bw/dah-dhn-625z16-dg-bw) - The same specification on paper - [DAH Solar DHN-620Z16/DG(BW) vs DAH Solar DHN-615Z16/DG(BW)](https://comparepv.com/compare/dah-dhn-620z16-dg-bw/dah-dhn-615z16-dg-bw) - The same specification on paper - [DAH Solar DHN-620Z16/DG(BW) vs DAH Solar DHN-610Z16/DG(BW)](https://comparepv.com/compare/dah-dhn-620z16-dg-bw/dah-dhn-610z16-dg-bw) - 3 differences, the largest is module efficiency - [DAH Solar DHN-620Z16/DG(BW) vs DAH Solar DHN-605Z16/DG(BW)](https://comparepv.com/compare/dah-dhn-620z16-dg-bw/dah-dhn-605z16-dg-bw) - 3 differences, the largest is module efficiency - [DAH Solar DHN-620Z16/DG(BW) vs DAH Solar DHN-600Z16/DG(BW)](https://comparepv.com/compare/dah-dhn-620z16-dg-bw/dah-dhn-600z16-dg-bw) - 4 differences, the largest is module efficiency - [DAH Solar DHN-620Z16/DG(BW) vs DAH Solar DHN-595Z16/DG(BW)](https://comparepv.com/compare/dah-dhn-620z16-dg-bw/dah-dhn-595z16-dg-bw) - 6 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/dah-dhn-620z16-dg-bw/dah-dhn-66z16-dg-610w 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.