--- title: "DAH Solar DHN-78X16/DG-625 vs DAH Solar DHN-78X16/DG-640 - Solar Panel Comparison | ComparePV" description: "Compare DAH Solar DHN-78X16/DG-625 vs DAH Solar DHN-78X16/DG-640 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-78x16-dg-625/dah-dhn-78x16-dg-640" updated: 2026-09-11 --- # DAH Solar DHN-78X16/DG-625 vs DAH Solar DHN-78X16/DG-640 640 leads on the differences that matter The largest is module efficiency: 0.54 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [DAH Solar DHN-78X16/DG-625](https://comparepv.com/panel/dah-dhn-78x16-dg-625) | [DAH Solar DHN-78X16/DG-640](https://comparepv.com/panel/dah-dhn-78x16-dg-640) | | Manufacturer | DAH Solar | DAH Solar | | Power | 625 Wp | 640 Wp | | Efficiency | 22.36 % | 22.90 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 625 | 640 | Difference | | --- | --- | --- | --- | | Module efficiency | 22.36 % | 22.90 % | +0.54 pp for 640 | | Power density | 223.6 Wp/m² | 229.0 Wp/m² | +5.4 Wp/m² for 640 | | Rated power | 625 Wp | 640 Wp | +15 W for 640 | ## Every compared parameter | Parameter | 625 | 640 | | --- | --- | --- | | Rated power | 625 Wp | 640 Wp | | Module efficiency | 22.36 % | 22.90 % | | Power density | 223.6 Wp/m² | 229.0 Wp/m² | | Open-circuit voltage | 55.80 V | 56.40 V | | Voltage at max power | 47.00 V | 47.60 V | | Short-circuit current | 14.14 A | 14.32 A | | Current at max power | 13.30 A | 13.45 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2465x1134x30 mm | 2465x1134x30 mm | | Module area | 2.795 m² | 2.795 m² | | Weight | 34.2 kg | 34.2 kg | | Weight per kWp | 54.7 kg/kWp | 53.4 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 156 | 156 | | Bifacial | Yes | Yes | ## Thirty-year yield Each panel's own declared degradation curve, 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, 625:** 20,970 kWh - **Cumulative output, 640:** 21,473 kWh - **Gap:** 503 kWh ## Output when hot | Condition | Cell temperature | 625 | 640 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 625 W | 640 W | 100.0% of rated power | | Cool, bright day | 40 °C | 598 W | 612 W | 95.7% of rated power | | Typical summer roof | 55 °C | 571 W | 584 W | 91.3% of rated power | | Hot roof | 70 °C | 543 W | 556 W | 87.0% of rated power | ## Against the whole database | Measure | 625 | 640 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #5,007 | #2,359 | 14,005 | 640 leads by 2,648 places | | Power density | #4,955 | #2,389 | 14,005 | 640 leads by 2,566 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #9,127 | #7,363 | 14,005 | 640 leads by 1,764 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #2,522 | #1,704 | 14,005 | 640 leads by 818 places | ## Questions ### Which panel is better: DAH Solar DHN-78X16/DG-625 or DAH Solar DHN-78X16/DG-640? According to our database: **DAH Solar DHN-78X16/DG-640** has higher module efficiency (**22.90%** vs **22.36%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of DAH Solar DHN-78X16/DG-625 and DAH Solar DHN-78X16/DG-640? **DAH Solar DHN-78X16/DG-625** has a module efficiency of **22.36%**, while **DAH Solar DHN-78X16/DG-640** is **22.90%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does DAH Solar DHN-78X16/DG-625 use vs DAH Solar DHN-78X16/DG-640? **DAH Solar DHN-78X16/DG-625** uses **TOPCon** cells; **DAH Solar DHN-78X16/DG-640** 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-78X16/DG-625 and DAH Solar DHN-78X16/DG-640? **DAH Solar DHN-78X16/DG-625** has a **30 years** power warranty; **DAH Solar DHN-78X16/DG-640** 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-78X16/DG-625 and DAH Solar DHN-78X16/DG-640 bifacial panels? Both **DAH Solar DHN-78X16/DG-625** and **DAH Solar DHN-78X16/DG-640** 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-78X16/DG-625 vs DAH Solar DHN-78X16/DG-640W](https://comparepv.com/compare/dah-dhn-78x16-dg-625/dah-dhn-78x16-dg-640w) - 4 differences, the largest is module efficiency - [DAH Solar DHN-78X16/DG-625 vs DAH Solar DHN-78X16/DG-635W](https://comparepv.com/compare/dah-dhn-78x16-dg-625/dah-dhn-78x16-dg-635w) - 4 differences, the largest is module efficiency - [DAH Solar DHN-78X16/DG-625 vs DAH Solar DHN-78X16/DG-635](https://comparepv.com/compare/dah-dhn-78x16-dg-625/dah-dhn-78x16-dg-635) - 3 differences, the largest is module efficiency - [DAH Solar DHN-78X16/DG-625 vs DAH Solar DHN-78X16/DG-630W](https://comparepv.com/compare/dah-dhn-78x16-dg-625/dah-dhn-78x16-dg-630w) - One difference: dimensions - [DAH Solar DHN-78X16/DG-625 vs DAH Solar DHN-78X16/DG-630](https://comparepv.com/compare/dah-dhn-78x16-dg-625/dah-dhn-78x16-dg-630) - The same specification on paper - [DAH Solar DHN-78X16/DG-625 vs DAH Solar DHN-78X16/DG-625W](https://comparepv.com/compare/dah-dhn-78x16-dg-625/dah-dhn-78x16-dg-625w) - One difference: dimensions --- Source: https://comparepv.com/compare/dah-dhn-78x16-dg-625/dah-dhn-78x16-dg-640 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.