--- title: "DAH Solar DHN-66Z16/DG-590 590W Solar Panel - Specs & Review | ComparePV" description: "DAH Solar DHN-66Z16/DG-590 590W solar panel. Specs: 21.84% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/dah-dhn-66z16-dg-590" updated: 2026-09-11 --- # DAH Solar DHN-66Z16/DG-590 Middle of its segment, modest efficiency 1,018 panels in the segment TOPCon 550-600 W ## Identity - **Manufacturer:** DAH Solar - **Model:** DHN-66Z16/DG-590 - **Series:** DHN-66Z16/DG - **Rated power:** 590 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 550-600 W (1018 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 590 W | 580 W | Strong - top 18% | | | Module efficiency | 21.84% | 22.44% | Weak - bottom 15% | 6,985 | | Power density | 218.4 | 224.4 | Weak - bottom 15% | 6,954 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 32.5 kg | 31.2 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.84% | 22.44% | Weak - bottom 15% | 6,985 | | Power density | 218.4 | 224.4 | Weak - bottom 15% | 6,954 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 55.1 | 53.8 | Typical | 9,503 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **21.84% module efficiency** - Bottom 15% of the TOPCon 550-600 W segment, against a median of 22.44%. - **218.4 watts per square metre** - Bottom 15% of the TOPCon 550-600 W segment, against a median of 224.4. - **Best for:** Residential, commercial, utility-scale, shaded-installations and hot-climate. - **Not ideal for:** Tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 590 W - **Efficiency:** 21.84 % - **Voltage at Pmax (Vmp):** 40.10 V - **Current at Pmax (Imp):** 14.71 A - **Open-circuit voltage (Voc):** 47.40 V - **Short-circuit current (Isc):** 15.64 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.046 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 132 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2382 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 32.5 kg - **Area:** 2.70 m2 - **Power density:** 218.4 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 516 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 6985 of 14005 | | Power density | 6954 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 9503 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Up to 23.14% efficiency – top of the segment** - The peak efficiency of 23.14% matches the Techwise Sun-Pursuit Plus (23.14%) and exceeds the Leapton LP182 (22.36%). Achieving the same result as the LONGi Hi-MO 7 (23.1%) at an identical peak power of 625 Wp places this series at the very front of the competitive field among comparable products. - **Low temperature coefficient: -0.29%/°C** - The Pmax temperature coefficient of -0.29%/°C is approximately 15–20% better than that of typical PERC modules (-0.34 to -0.36%/°C). At a module temperature of 65°C — common during Polish summers — power loss is approximately 11.6% versus roughly 13.6–14.4% for PERC modules, resulting in a measurable improvement in summertime energy yield. - **N-type TOPCon + bifacial double-glass with no LID degradation** - N-type cells exhibit Light-Induced Degradation (LID) below 1%, compared to 2–3% for PERC cells. The double-glass construction eliminates moisture ingress and the risk of Potential-Induced Degradation (PID), ensuring more stable power output throughout the module's entire service life. According to the ENF datasheet, guaranteed power output after 30 years is ≥87.4%. - **BNEF Tier 1 continuously throughout 2025** - DAH Solar maintains bankable Tier 1 status according to BloombergNEF for Q1, Q3, and Q4 2025 — a key acceptance criterion for project financing by banks, PV funds, and insurers, applicable to both subsidized residential installations and utility-scale commercial projects. - **30-year power warranty (≥87.4%) and 15-year product warranty** - The 15-year product warranty is 3 years longer than that offered by LONGi Solar for the Hi-MO 7 series (12 years), while the guaranteed power output level after 30 years is identical at 87.4%. This represents a favorable relationship for investors comparing TCO (Total Cost of Ownership). ## Cons - **Weight of 32.5 kg – a limitation on low load-bearing roofs** - The double-glass construction increases module weight to 32.5 kg (ENF datasheet dimensions: 2382×1134×30 mm), compared to approximately 22–25 kg for typical single-glass framed modules. On older roofs with limited load-bearing capacity (\<15 kg/m²), a structural engineering assessment is required, which adds cost and extends project timelines. - **Smaller service network in Poland than market leaders** - Despite its BNEF Tier 1 status, DAH Solar has a significantly narrower network of authorized distributors and service points in Poland compared to LONGi, Trina Solar, or JA Solar. For warranty claims outside major metropolitan areas, response times and logistical availability may be longer. ## About this series The DAH DHN-66Z16/DG solar panel series introduces a new level of quality to commercial and residential installations thanks to the use of advanced N-type TOPCon cells. This solution effectively eliminates the problem of light- and temperature-induced degradation, which translates into significantly higher efficiency in the long-term perspective. The **bifacial double glass** construction allows for active energy harvesting from both sides of the module, which is crucial for installations on high-albedo surfaces, such as bright roofs or the ground. The use of **half-cut cell technology** minimizes energy losses resulting from shading, ensuring stable operation even in difficult weather conditions. Exceptional mechanical strength and a double glass coating make these modules handle extreme snow loads and strong winds perfectly, offering **maximum resistance to external factors**. This series is dedicated to investors seeking uncompromising performance and investment security for years. Compared to standard P-type modules, these units are characterized by a **lower temperature coefficient**, which means smaller power drops on hot days. It is an ideal choice for large-scale projects and modern micro-installations where every kilowatt-hour obtained per square meter counts. The innovative **sealed edge design** further protects the panels against moisture, putting them a step ahead of traditional competition. ## Notable figures - Module efficiency of 21.8% is 0.6pp below average for \*\*TOPCon 550-600W\*\* panels (median: 22.4%) - Power density of 218.4 W/m² is 6.0 W/m² below \*\*TOPCon 550-600W\*\* median (224.4 W/m²) - needs more roof space - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 550-600W\*\* panels - Weight of 32.5 kg is 1.3 kg above \*\*TOPCon 550-600W\*\* median (31.2 kg) - verify structural support - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces ## Questions ### What warranty is provided for the DAH Solar DHN-66Z16/DG panels? The DHN-66Z16/DG series comes with a 15-year product warranty and a 30-year linear power output warranty. After 25 years, the manufacturer guarantees at least 89.4% of nominal power output, and after 30 years at least 87.4%. This is one of the longest power warranties available on the market, making it an exceptionally secure investment for both commercial and residential installations. ### Do DAH Solar DHN-66Z16/DG panels perform well on hot days? Yes, the DHN-66Z16/DG series significantly outperforms standard polycrystalline silicon panels at elevated temperatures. The temperature coefficient of Pmax is only -0.29%/°C, meaning the module loses that minimal amount of output for every degree of temperature rise. Thanks to N-type TOPCon cell technology, power losses on hot days are noticeably lower than those seen in widely used P-type modules. ### What does bifacial mean in the DAH DHN-66Z16/DG panels, and does it make sense on a conventional pitched roof? Bifacial means the panel generates energy from both its front side and its rear side by capturing irradiance reflected from the surface beneath it. On a light-colored roof, concrete, or high-albedo ground, the rear-side gain can contribute an additional 5–15% of energy yield per year. On darker surfaces the effect is reduced; however, the double glass construction still provides superior durability compared to modules with a conventional polymer backsheet. ### How much does the DAH Solar DHN-66Z16/DG panel weigh, and is it suitable for a typical pitched roof? The module weighs approximately 32.5–33.5 kg and has dimensions of 2382×1134×30 mm. This large format is aimed primarily at commercial installations or extensive roof surfaces. Before mounting on a pitched roof, the load-bearing capacity of the roof structure must be assessed and the mounting system sized accordingly, as the double glass construction makes these panels heavier than standard single-glass modules of comparable power output. ### How do the DHN-66Z16/DG panels differ from conventional P-type panels available on the market? The key difference is the use of N-type TOPCon cell technology in place of the older PERC (P-type) architecture. N-type cells achieve higher efficiency (up to 23.14%), a lower temperature coefficient, and virtually eliminate light-induced degradation (LID), which affects the majority of P-type modules. This means that throughout the entire service life of the DHN-66Z16/DG, the module retains more of its nominal 625 Wp output than a lower-cost P-type equivalent would. ### Who is the DAH Solar DHN-66Z16/DG series intended for — residential or commercial use? The DHN-66Z16/DG series is well suited for both residential micro-installations on large roof surfaces and commercial projects, ground-mounted solar farms, and industrial installations. The large module format and power output of up to 625 Wp allow a high total system capacity to be achieved with fewer modules. DAH Solar is a Bloomberg NEF Tier 1 manufacturer, providing confidence in the long-term financial stability of the warranty provider. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/en-dhn-66z16-dg-585-625w-28acb879c87e.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | -30 W, lighter, +3.0 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | +50 W, lighter, +3.0 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | -35 W, lighter, +2.8 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | +45 W, lighter, +2.8 pp | | [AIKO AIKO-A630-MAH72Dw](https://comparepv.com/panel/aiko-aiko-a630-mah72dw) | 630 W | +40 W, cooler, +2.6 pp | | [Longi Solar LR7-60HVHL-550M](https://comparepv.com/panel/longi-lr7-60hvhl-550m) | 550 W | -40 W, 16 kg lighter, +2.6 pp | | [DAH Solar DHN-66Z20/DG(BW)-585W](https://comparepv.com/panel/dah-dhn-66z20-dg-bw-585w) | 585 W | Very close match | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +90 W, lighter, +3.4 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +85 W, lighter, +3.2 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +110 W, cooler, +3.2 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +105 W, cooler, +3.1 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +80 W, lighter, +3.0 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +80 W, lighter, +3.0 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +80 W, cooler, +3.0 pp | --- Source: https://comparepv.com/panel/dah-dhn-66z16-dg-590 Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.