--- title: "DAH Solar DHN-48Z20/DG(BB)-425 425W Solar Panel - Specs & Review | ComparePV" description: "DAH Solar DHN-48Z20/DG(BB)-425 425W solar panel. Specs: 21.27% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/dah-dhn-48z20-dg-bb-425" updated: 2026-09-11 --- # DAH Solar DHN-48Z20/DG(BB)-425 Middle of its segment, modest efficiency 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** DAH Solar - **Model:** DHN-48Z20/DG(BB)-425 - **Series:** DHN-48Z20/DG(BB) - **Rated power:** 425 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 400-450 W (1218 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 425 W | 435 W | Typical | | | Module efficiency | 21.27% | 22.00% | Weak - bottom 10% | 8,849 | | Power density | 212.7 | 220.2 | Weak - bottom 13% | 8,733 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 23.9 kg | 22.0 kg | Weak - bottom 21% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.27% | 22.00% | Weak - bottom 10% | 8,849 | | Power density | 212.7 | 220.2 | Weak - bottom 13% | 8,733 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 56.2 | 51.4 | Weak - bottom 21% | 10,505 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **21.27% module efficiency** - Bottom 10% of the TOPCon 400-450 W segment, against a median of 22.00%. - **212.7 watts per square metre** - Bottom 13% of the TOPCon 400-450 W segment, against a median of 220.2. - **56.2 kg per kWp** - Bottom 21% of the TOPCon 400-450 W segment, against a median of 51.4. - **Best for:** Residential, commercial, shaded-installations and hot-climate. - **Not ideal for:** Tight roof space, roofs where every square metre has to count and weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 425 W - **Efficiency:** 21.27 % - **Voltage at Pmax (Vmp):** 29.60 V - **Current at Pmax (Imp):** 14.36 A - **Open-circuit voltage (Voc):** 35.00 V - **Short-circuit current (Isc):** 15.34 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 - **Bifacial gain:** 25.00 ### Physical - **Length:** 1762 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 23.9 kg - **Area:** 2.00 m2 - **Power density:** 212.7 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 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:** 371 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 8849 of 14005 | | Power density | 8733 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 10505 of 14005 | | Warranty | 21 of 14005 | ## Pros - **N-type TOPCon: Low Annual Degradation** - The manufacturer declares degradation of ≤1% in year 1 and ≤0.4%/year in years 2–30 — approximately 25–30% lower than the typical ~0.55%/year for PERC modules. N-type technology also provides resistance to LID (light-induced degradation) and better performance under diffuse irradiance, which is particularly relevant in the Polish climate with its high proportion of overcast days. - **Full-Screen: Self-Cleaning Frame Profile** - The patented Full-Screen design eliminates the step between the frame and the glass, allowing rainwater to carry away dust and particulates freely. DAH Solar claims up to 15% higher energy yield compared to standard framed modules of the same rated power, directly reducing O&M costs through less frequent array cleaning. - **30-Year Linear Power Warranty** - The series carries a 30-year linear power warranty — 5 years longer than the peer-comparable Waaree ARKA Series (25 years). Assuming degradation of ≤0.4%/year, the module retains >87% of nominal power after 30 years, materially improving project NPV in bankability assessments and LCOE calculations. - **Bifacial Double Glass: Additional Yield from Reflected Irradiance** - The dual-glass bifacial construction enables energy generation from irradiance reflected off the ground surface (typically +5–15% yield gain depending on albedo). The double-glass architecture also eliminates backsheets susceptible to delamination and moisture-induced degradation, resulting in superior mechanical durability in open-rack installations. - **BNEF Tier 1 — Confirmed Bankability** - DAH Solar has appeared continuously on the BloombergNEF Tier 1 list from at least Q1 2025 through Q3 2025, confirming the manufacturer's bankability as required by institutions financing PV projects. For commercial installations and debt-financed projects, Tier 1 status is a prerequisite for insurance underwriting and due diligence approval. ## Cons - **UVID Risk in TOPCon Modules** - Independent testing by Kiwa PVEL (Scorecard 2025) recorded an 83% failure rate for N-type modules in UV stress testing (up from 66% the prior year), and NREL has flagged 'severe' levels of UV-induced degradation (UVID) in commercial N-type modules. For TOPCon modules specifically, UVID ranges from 0.6% to 16.6% depending on the manufacturer's BOM (median 3.1%). DAH Solar has not published independently verifiable UVID data specific to the DHN-48Z20/DG(BB) series, which represents a material risk factor for contracts with performance guarantees (PPA, EPC). ## About this series The DAH DHN-48Z20/DG(BB) panel series redefines performance standards thanks to patented **Full-Screen** technology, which effectively eliminates the problem of dirt accumulation on the module edges. The lack of a traditional step between the frame and the glass allows for the free drainage of rainwater along with dust and debris, which directly translates into a real increase in energy yields without the need for frequent cleaning of the installation. The use of innovative **N-type TOPCon** cells ensures exceptionally low annual degradation and excellent efficiency in diffused light conditions, which is crucial in the Polish climate. The **Bifacial Double Glass** construction allows for energy generation from reflected rays as well, significantly increasing system efficiency on various types of surfaces. The aesthetic finish in the **Black Border** standard makes these panels blend perfectly with modern architecture, meeting the expectations of the most demanding investors. This model effectively solves the problem of spot shading caused by lingering mud, clearly distinguishing it from standard competitive solutions. It is a product dedicated to homeowners and commercial property owners who value maintenance-free operation and maximum durability for decades. ## Notable figures - Efficiency of 21.3% is 0.7pp below the \*\*TOPCon 400-450W\*\* median (22.0%) - 212.7 W/m² power density is 7.5 W/m² below \*\*TOPCon 400-450W\*\* median (220.2 W/m²) - requires larger installation area - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 400-450W\*\* panels - Weight of 23.9 kg is 1.9 kg above \*\*TOPCon 400-450W\*\* median (22.0 kg) - verify structural support - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces ## Questions ### What does the Full-Screen technology in DAH Solar DHN-48Z20/DG(BB) panels offer, and is it genuinely worth the premium? Full-Screen technology eliminates the traditional step between the frame and the glass, allowing rain to effectively flush dust and mud from the module edges. According to manufacturer data, soiling accumulation in that recessed area can cause 6–15% losses in energy output. In the Polish climate, where rooftops are frequently coated with road dust and smog particulates, this effect is noticeable and meaningfully reduces the need for manual cleaning of the system. ### What warranty coverage applies to the DAH Solar DHN-48Z20/DG(BB) panels? The DHN-48Z20/DG(BB) series carries a 25-year product warranty covering material and workmanship defects, as well as a 30-year linear power output warranty. This means the manufacturer commits to maintaining a specified performance level for three decades. DAH Solar holds Tier 1 manufacturer status, which significantly increases the likelihood that warranty claims will actually be honored. ### What is the annual degradation rate of the DAH DHN-48Z20/DG(BB) panels compared to older polycrystalline cells? The N-type TOPCon cells used in the DHN-48Z20/DG(BB) series exhibit an annual degradation rate of approximately 0.4%, whereas older polycrystalline cells degrade at 0.7–0.8% per year. Over 25 years of operation, the difference in total energy generated can amount to several percentage points in favor of TOPCon technology, which translates into measurable savings as energy prices continue to rise. ### Do the bifacial DAH Solar DHN-48Z20/DG(BB) panels deliver a real increase in energy production on a pitched roof in Poland? Yes, although the bifacial gain on a pitched roof is smaller than on ground-mounted systems or flat roofs with a light-colored surface. On a typical ceramic or concrete tile roof, an additional 3–8% of energy from the rear side of the module can be expected, particularly with light-colored mounting components and an adequate air gap above the roof surface. The Bifacial Double Glass dual-glass construction also improves moisture resistance and extends the service life of the module. ### Do the 455 Wp DAH Solar DHN-48Z20/DG(BB) panels perform well under the overcast conditions typical of Poland? Yes. N-type TOPCon cells exhibit better efficiency under diffuse light conditions than older P-type technologies. This means that on the cloudy days characteristic of the Polish climate, the DHN-48Z20/DG(BB) series produces relatively more energy than modules based on PERC cells. This is one of the key advantages of this technology when selecting a PV system at our latitude. ### Does the Black Border aesthetic finish on the DAH DHN-48Z20/DG(BB) series affect performance, or is it purely cosmetic? The Black Border finish is primarily an aesthetic feature that allows the panel to blend more harmoniously with dark roof tiles or metal roofing. The black frame absorbs marginally more heat than a silver one, which can result in a very slight efficiency reduction on extremely hot days; however, this difference is negligible under Polish climate conditions. In return, you gain a uniform appearance for the installation, which matters in modern architecture and for projects with strict aesthetic requirements. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/en-dhn-48z20-dg-bb-425-455w-1-3a28740e0bec.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Maxeon SPR-MAX7-475](https://comparepv.com/panel/maxeon-spr-max7-475) | 475 W | +50 W, +2.7 pp, +10 yr warranty | | [Just Solar JST-EDMH-(445-465)W-TD (465W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-465w-class) | 465 W | +40 W, lighter, +2.5 pp | | [JA Solar JAT54S40-475/LR](https://comparepv.com/panel/ja-solar-jat54s40-475-lr) | 475 W | +50 W, lighter, +2.5 pp | | [Tongwei TWMNH-48HW475](https://comparepv.com/panel/tongwei-solar-twmnh-48hw475) | 475 W | +50 W, +2.5 pp | | [Astronergy CHSM48RN(DG)/F-BH-475](https://comparepv.com/panel/astronergy-chint-new-energy-technology-co-ltd-chsm48rn-dg-f-bh-475) | 475 W | +50 W, +2.5 pp | | [AIKO AIKO-A475-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a475-mce54mw) | 475 W | +50 W, cooler, +2.5 pp | | [AIKO AIKO-A475-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a475-mah54mw) | 475 W | +50 W, cooler, +2.5 pp | | [DAH Solar DHN-48Z16/DG(RR)-380W](https://comparepv.com/panel/dah-dhn-48z16-dg-rr-380w) | 380 W | -45 W, -2.2 pp | | [DAH Solar DHN-48Z16/DG(RR)-385W](https://comparepv.com/panel/dah-dhn-48z16-dg-rr-385w) | 385 W | -40 W, -2.0 pp | | [DAH Solar DHN-48Z16/DG(RR)-390W](https://comparepv.com/panel/dah-dhn-48z16-dg-rr-390w) | 390 W | -35 W, -1.8 pp | | [DAH Solar DHN-48Z16/DG(RR)-395W](https://comparepv.com/panel/dah-dhn-48z16-dg-rr-395w) | 395 W | -30 W, -1.5 pp | | [DAH Solar DHN-48Z16/DG(RR)-400W](https://comparepv.com/panel/dah-dhn-48z16-dg-rr-400w) | 400 W | -25 W, -1.2 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +85 W, cooler, +3.7 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +70 W, cooler, +3.5 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +80 W, cooler, +3.4 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +65 W, cooler, +3.2 pp | --- Source: https://comparepv.com/panel/dah-dhn-48z20-dg-bb-425 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.