--- title: "DAH Solar DHN-48Z20/DG(BB)-455W 455W Solar Panel - Specs & Review | ComparePV" description: "DAH Solar DHN-48Z20/DG(BB)-455W 455W solar panel. Specs: 22.77% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/dah-dhn-48z20-dg-bb-455w" updated: 2026-09-11 --- # DAH Solar DHN-48Z20/DG(BB)-455W Solid all-round for its segment 1,089 panels in the segment TOPCon 450-500 W ## Identity - **Manufacturer:** DAH Solar - **Model:** DHN-48Z20/DG(BB)-455W - **Series:** DHN-48Z20/DG(BB) 425–455W - **Rated power:** 455 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 450-500 W (1089 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 455 W | 465 W | Typical | | | Module efficiency | 22.77% | 22.52% | Typical | 3,073 | | Power density | 227.7 | 225.2 | Typical | 2,888 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 23.9 kg | 24.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.77% | 22.52% | Typical | 3,073 | | Power density | 227.7 | 225.2 | Typical | 2,888 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 52.5 | 52.2 | Typical | 6,129 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Residential, commercial and BIPV. ## Specification ### Electrical - **Rated power (Pmax):** 455 W - **Efficiency:** 22.77 % - **Voltage at Pmax (Vmp):** 30.80 V - **Current at Pmax (Imp):** 14.77 A - **Open-circuit voltage (Voc):** 36.20 V - **Short-circuit current (Isc):** 15.70 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:** 96 - **Bifacial:** yes ### Physical - **Length:** 1762 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 23.9 kg - **Area:** 2.00 m2 - **Power density:** 227.7 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 years - **Performance warranty:** 30 years ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 3073 of 14005 | | Power density | 2888 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 6129 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Favorable Temperature Coefficient** - The temperature coefficient of -0.29%/°C (Pmax) is notably better than that of typical PERC modules (-0.34–0.37%/°C), translating into meaningfully higher energy yield on warm, sunny days. For rooftop installations in Poland, this difference can represent up to 2–3% higher annual yield during peak summer production months. - **30-Year Linear Power Warranty ≥87.4%** - DAH guarantees ≥89.4% of nominal power after 25 years and ≥87.4% after 30 years. Peer comparable Waaree ARKA Series offers only a 25-year power warranty, and the 30-year retention level places this series above the market norm for the residential segment. - **Glass-Glass Durability: Snow Load 5400 Pa** - The dual-glass construction (2+2 mm glass) withstands snow loads of up to 5400 Pa and wind loads of up to 2400 Pa — above-standard values compared to the typical 2400/2400 Pa ratings of glass-backsheet modules. Particularly relevant for installations in mountainous and sub-alpine locations in Poland. - **BNEF Tier 1 Confirmed Q1 2026** - DAH Solar maintains uninterrupted BNEF Tier 1 status, confirmed in both Q4 2025 and Q1 2026. Bankable status translates into access to installation insurance and bank financing — a key consideration for commercial projects and leasing arrangements. - **Efficiency at the Top of the Segment** - Peak efficiency of 22.77% (455W variant) is on par with the highest-rated peer comparables — Sunlike Solar SKT420~455M10-108D6 (22.8%) and IBC Solar LS-TA2 (22.8%) — while clearly outperforming the Waaree ARKA Series (20.93%). The series ranks within the top 10% of the 48-cell TOPCon module segment. ## Cons - **Weight 23.9 kg — Structural Load Consideration** - The glass-glass construction results in a weight of 23.9 kg, approximately 20–25% heavier than typical glass-backsheet modules in a comparable power range (~18–20 kg). On older roofs (rafter structures predating the 1990s), a structural load assessment is required prior to installation, increasing both project cost and preparation time. ## About this series The DAH DHN-48Z20/DG(BB) 425-455W series is a range of modules designed for maximum aesthetics and stable energy production in real rooftop conditions. They are characterized by a **full black appearance** and a design that seamlessly integrates with the roof, ensuring a consistent look, even on modern buildings. The use of **N-type cells in TOPCon technology** helps minimize losses over time and maintain high efficiency over a longer period, which will be appreciated by those planning long-term installations. These modules are also **bifacial** - they can utilize reflected light, which is important on bright roofs, terraces, and ground-based structures. Another advantage is the **glass-glass construction**, which improves resistance to loads and environmental conditions, reducing the risk of degradation. This series is suitable for investors who want to combine premium aesthetics with predictable energy yield, whether in single-family homes or smaller commercial installations. ## Notable figures - At 22.8% efficiency, this panel is on par with typical \*\*TOPCon 450-500W\*\* modules - At 227.7 W/m² power density, roof space requirements are typical for \*\*TOPCon 450-500W\*\* panels - Temperature coefficient of -0.29%/°C matches the \*\*TOPCon 450-500W\*\* median - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface - #3073 for efficiency, #2165 for temperature performance out of 14005 panels ## Questions ### What warranty is provided for the DAH Solar DHN-48Z20/DG(BB) 425–455W series? The DHN-48Z20/DG(BB) series comes with a 25-year product warranty covering manufacturing defects and a 30-year linear power output warranty. This is one of the most comprehensive warranty packages available on the market — most competing modules offer a power warranty of up to 25 years. DAH Solar is a Bloomberg NEF Tier 1 manufacturer, providing genuine confidence that these commitments will be honored over a three-decade horizon. ### What does the BB designation in the DHN-48Z20/DG(BB) series name mean, and how do these panels look on a rooftop? BB stands for Black Back, indicating a fully black module — black cells, black frame, and black backsheet. The result is a uniform, aesthetically refined appearance that blends seamlessly with dark roof tiles or standing-seam metal roofing. On modern buildings and flat-roof installations, these modules deliver a clean, discreet look with no contrasting silver elements. ### Do the DAH Solar DHN-48Z20/DG(BB) panels perform well on hot days or at elevated temperatures? Yes. The N-type TOPCon cells used in this series feature a lower Pmax temperature coefficient of approximately -0.29%/°C, which outperforms typical PERC modules at -0.35%/°C. This translates to reduced power losses during hot weather — at 70°C, the cells lose roughly 15% less energy than standard polycrystalline modules. This is a meaningful advantage during hot summer conditions. ### How much does a single panel from the DHN-48Z20/DG(BB) series weigh, and can it be installed on a typical pitched roof? The module weighs approximately 23.9 kg with dimensions of 1762×1134×30 mm. This is slightly heavier than conventional aluminum-framed modules because the glass-glass construction — two glass panes instead of a polymer backsheet — adds mass. Installation on typical residential pitched roofs is feasible, but it is important to verify that the roof structure can bear the calculated load. An installer should assess load-bearing capacity before ordering. ### Does the bifacial design of the DHN-48Z20/DG(BB) panels make sense on a standard pitched roof in Poland? On dark roof tiles, the bifacial gain is minimal due to low rear-surface albedo. Dual-side energy harvesting is most beneficial on high-reflectivity surfaces — light-colored facades, white TPO/PVC membranes on flat roofs, gravel, or grass in ground-mounted systems. If the roof surface is dark, the primary benefit of bifaciality shifts from additional power output to enhanced mechanical durability inherent in the glass-glass construction. ### How does TOPCon technology in the DHN-48Z20/DG(BB) series differ from mainstream PERC cells? TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell architecture featuring an additional passivation layer that suppresses charge carrier recombination. In practice, this results in higher efficiency (above 22%) and a slower degradation rate compared to PERC modules. The DHN-48Z20/DG(BB) series achieves up to 455W in a 48-cell format — an output level that is difficult to reach with legacy PERC technology at the same physical dimensions. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/en-dhn-48z20-dg-bb-425-455w-1-3a28740e0bec.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +40 W, cooler, +2.0 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +50 W, cooler, +1.9 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +35 W, cooler, +1.7 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +45 W, cooler, +1.7 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +45 W, cooler, +1.7 pp | | [Gokin GK-3-54HGb-500M](https://comparepv.com/panel/gokin-gk-3-54hgb-500m) | 500 W | +45 W, cooler, +1.7 pp | | [DAH Solar DHN-48Z16/DG(RR)-380W](https://comparepv.com/panel/dah-dhn-48z16-dg-rr-380w) | 380 W | -75 W, -3.8 pp | | [DAH Solar DHN-48Z16/DG(RR)-385W](https://comparepv.com/panel/dah-dhn-48z16-dg-rr-385w) | 385 W | -70 W, -3.5 pp | | [DAH Solar DHN-48Z16/DG(RR)-390W](https://comparepv.com/panel/dah-dhn-48z16-dg-rr-390w) | 390 W | -65 W, -3.2 pp | | [DAH Solar DHN-48Z16/DG(RR)-395W](https://comparepv.com/panel/dah-dhn-48z16-dg-rr-395w) | 395 W | -60 W, -3.0 pp | | [DAH Solar DHN-48Z16/DG(RR)-400W](https://comparepv.com/panel/dah-dhn-48z16-dg-rr-400w) | 400 W | -55 W, -2.8 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +55 W, cooler, +2.2 pp | --- Source: https://comparepv.com/panel/dah-dhn-48z20-dg-bb-455w 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.