--- title: "DAH Solar DHN-66Y18/DG-725 vs DAH Solar DHN-78X16/DG-630W - Solar Panel Comparison | ComparePV" description: "Compare DAH Solar DHN-66Y18/DG-725 vs DAH Solar DHN-78X16/DG-630W 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-66y18-dg-725/dah-dhn-78x16-dg-630w" updated: 2026-09-11 --- # DAH Solar DHN-66Y18/DG-725 vs DAH Solar DHN-78X16/DG-630W 66Y18/DG-725 leads on the differences that matter The largest is module efficiency: 0.80 pp more efficient. 6 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-66Y18/DG-725](https://comparepv.com/panel/dah-dhn-66y18-dg-725) | [DAH Solar DHN-78X16/DG-630W](https://comparepv.com/panel/dah-dhn-78x16-dg-630w) | | Manufacturer | DAH Solar | DAH Solar | | Power | 725 Wp | 630 Wp | | Efficiency | 23.34 % | 22.54 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 66Y18/DG-725 | 78X16/DG-630W | Difference | | --- | --- | --- | --- | | Module efficiency | 23.34 % | 22.54 % | +0.80 pp for 66Y18/DG-725 | | Rated power | 725 Wp | 630 Wp | +95 W for 66Y18/DG-725 | | Power density | 233.4 Wp/m² | 225.4 Wp/m² | +8.0 Wp/m² for 66Y18/DG-725 | | Open-circuit voltage | 48.60 V | 56.00 V | 7.40 V apart | | Short-circuit current | 18.79 A | 14.20 A | 4.59 A apart | | Module area | 3.106 m² | 2.795 m² | 0.311 m² apart | | Weight | 36.7 kg | 34.2 kg | -2.5 kg for 78X16/DG-630W | | Weight per kWp | 50.6 kg/kWp | 54.3 kg/kWp | -3.7 kg/kWp for 66Y18/DG-725 | | Voltage at max power | 41.00 V | 47.20 V | 6.20 V apart | | Current at max power | 17.68 A | 13.35 A | 4.33 A apart | | Cell count | 132 | 156 | 24 cells apart | | Dimensions | 2384x1303x33 mm | 2465x1134x34 mm | 2384x1303x33 mm vs 2465x1134x34 mm | ## Every compared parameter | Parameter | 66Y18/DG-725 | 78X16/DG-630W | | --- | --- | --- | | Rated power | 725 Wp | 630 Wp | | Module efficiency | 23.34 % | 22.54 % | | Power density | 233.4 Wp/m² | 225.4 Wp/m² | | Open-circuit voltage | 48.60 V | 56.00 V | | Voltage at max power | 41.00 V | 47.20 V | | Short-circuit current | 18.79 A | 14.20 A | | Current at max power | 17.68 A | 13.35 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2384x1303x33 mm | 2465x1134x34 mm | | Module area | 3.106 m² | 2.795 m² | | Weight | 36.7 kg | 34.2 kg | | Weight per kWp | 50.6 kg/kWp | 54.3 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | - | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 156 | | 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, 66Y18/DG-725:** 24,325 kWh - **Cumulative output, 78X16/DG-630W:** 21,138 kWh - **Gap:** 3,187 kWh ## Output when hot | Condition | Cell temperature | 66Y18/DG-725 | 78X16/DG-630W | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 725 W | 630 W | 100.0% of rated power | | Cool, bright day | 40 °C | 693 W | 603 W | 95.7% of rated power | | Typical summer roof | 55 °C | 662 W | 575 W | 91.3% of rated power | | Hot roof | 70 °C | 630 W | 548 W | 87.0% of rated power | ## Against the whole database | Measure | 66Y18/DG-725 | 78X16/DG-630W | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #943 | #3,920 | 14,005 | 66Y18/DG-725 leads by 2,977 places | | Power density | #936 | #3,907 | 14,005 | 66Y18/DG-725 leads by 2,971 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #4,067 | #8,524 | 14,005 | 66Y18/DG-725 leads by 4,457 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #251 | #2,179 | 14,005 | 66Y18/DG-725 leads by 1,928 places | ## Questions ### Which panel is better: DAH Solar DHN-66Y18/DG-725 or DAH Solar DHN-78X16/DG-630W? According to our database: **DAH Solar DHN-66Y18/DG-725** has higher module efficiency (**23.34%** vs **22.54%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of DAH Solar DHN-66Y18/DG-725 and DAH Solar DHN-78X16/DG-630W? **DAH Solar DHN-66Y18/DG-725** has a module efficiency of **23.34%**, while **DAH Solar DHN-78X16/DG-**630 W**** is **22.54%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does DAH Solar DHN-66Y18/DG-725 use vs DAH Solar DHN-78X16/DG-630W? **DAH Solar DHN-66Y18/DG-725** uses **TOPCon** cells; **DAH Solar DHN-78X16/DG-**630 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-66Y18/DG-725 and DAH Solar DHN-78X16/DG-630W? **DAH Solar DHN-66Y18/DG-725** has a **30 years** power warranty; **DAH Solar DHN-78X16/DG-**630 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-66Y18/DG-725 and DAH Solar DHN-78X16/DG-630W bifacial panels? Both **DAH Solar DHN-66Y18/DG-725** and **DAH Solar DHN-78X16/DG-**630 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-66Y18/DG-725 vs DAH Solar DHN-66Y18/DG-720](https://comparepv.com/compare/dah-dhn-66y18-dg-725/dah-dhn-66y18-dg-720) - The same specification on paper - [DAH Solar DHN-66Y18/DG-725 vs DAH Solar DHN-66Y18/DG-715](https://comparepv.com/compare/dah-dhn-66y18-dg-725/dah-dhn-66y18-dg-715) - 3 differences, the largest is module efficiency - [DAH Solar DHN-66Y18/DG-725 vs DAH Solar DHN-66Y18/DG-710](https://comparepv.com/compare/dah-dhn-66y18-dg-725/dah-dhn-66y18-dg-710) - 3 differences, the largest is module efficiency - [DAH Solar DHN-66Y18/DG-725 vs DAH Solar DHN-66Y18/DG-705](https://comparepv.com/compare/dah-dhn-66y18-dg-725/dah-dhn-66y18-dg-705) - 3 differences, the largest is module efficiency - [DAH Solar DHN-66Y18/DG-725 vs DAH Solar DHN-66Y18/DG-700](https://comparepv.com/compare/dah-dhn-66y18-dg-725/dah-dhn-66y18-dg-700) - 5 differences, the largest is module efficiency - [DAH Solar DHN-78X16/DG-630W vs DAH Solar DHN-78X16/DG-640W](https://comparepv.com/compare/dah-dhn-78x16-dg-630w/dah-dhn-78x16-dg-640w) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/dah-dhn-66y18-dg-725/dah-dhn-78x16-dg-630w 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.