--- title: "DAH Solar DHN-54Z20/DG-490 490W Solar Panel - Specs & Review | ComparePV" description: "DAH Solar DHN-54Z20/DG-490 490W solar panel. Specs: 22.02% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/dah-dhn-54z20-dg-490" updated: 2026-09-11 --- # DAH Solar DHN-54Z20/DG-490 Middle of its segment, needs the roof space 1,089 panels in the segment TOPCon 450-500 W ## Identity - **Manufacturer:** DAH Solar - **Model:** DHN-54Z20/DG-490 - **Series:** DHN-54Z20/DG - **Rated power:** 490 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) | 490 W | 465 W | Strong - top 12% | | | Module efficiency | 22.02% | 22.52% | Weak - bottom 20% | 6,329 | | Power density | 220.2 | 225.2 | Weak - bottom 18% | 6,321 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 26.6 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 | 22.02% | 22.52% | Weak - bottom 20% | 6,329 | | Power density | 220.2 | 225.2 | Weak - bottom 18% | 6,321 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 54.3 | 52.2 | Typical | 8,524 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **220.2 watts per square metre** - Bottom 18% of the TOPCon 450-500 W segment, against a median of 225.2. - **22.02% module efficiency** - Bottom 20% of the TOPCon 450-500 W segment, against a median of 22.52%. - **Best for:** Residential and commercial. - **Not ideal for:** Roofs where every square metre has to count and tight roof space. ## Specification ### Electrical - **Rated power (Pmax):** 490 W - **Efficiency:** 22.02 % - **Voltage at Pmax (Vmp):** 33.50 V - **Current at Pmax (Imp):** 14.63 A - **Open-circuit voltage (Voc):** 39.50 V - **Short-circuit current (Isc):** 15.58 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:** 108 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 1962 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 26.6 kg - **Area:** 2.22 m2 - **Power density:** 220.2 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:** 428 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 6329 of 14005 | | Power density | 6321 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 8524 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Patented Full-Screen Design** - The absence of a frame protruding above the glass surface eliminates the accumulation of dust, deposits, and water at module edges — the primary cause of hot-spot formation in conventional panels. Rainwater naturally flushes away soiling, reducing yield losses especially in low-tilt installations (\<15°). DAH Solar is one of the few manufacturers to have patented this solution, and it entered the Top 10 of the TOP SOLAR MODULES ranking in September 2025. - **N-Type TOPCon: Low Temperature Coefficient** - The Pmax temperature coefficient is -0.29%/°C, compared to a typical -0.35%/°C for PERC technology. Under Polish climatic conditions — where modules can reach 60°C in summer — this translates to approximately 1.7% higher energy yield relative to a same-rated PERC module. N-type technology also eliminates the LID (Light-Induced Degradation) effect, keeping first-year degradation below 1%. - **30-Year Linear Power Warranty (>87.4% after 30 Years)** - The manufacturer guarantees >89.4% of rated power after 25 years and >87.4% after 30 years. In the 510W segment, competitor Trina Solar Vertex offers a standard 25-year warranty with a floor of 84.8%, making DAH's offer clearly more favorable over the financial horizon of a typical investment project (25–30 years). - **Bifacial Technology + Double Glass** - The double-glass (Double Glass) construction improves the module's fire safety rating and mechanical resistance to snow and wind loads. Bifaciality (~80% per DAH serial data) delivers an additional 5–20% energy yield depending on ground albedo — a tangible bonus particularly for ground-mounted systems and installations on white roofing membranes. - **BNEF Tier 1 — Bankable Manufacturer** - DAH Solar has been continuously listed on the BNEF Tier 1 index since 2025 (confirmed in Q1 and Q3 2025), confirming full eligibility for project bank financing. This is critical for commercial projects and utility-scale renewable energy farms that require credit accreditation — manufacturers outside Tier 1 are automatically disqualified by many lending institutions. ## Cons - **Specialized Mounting Requirements** - The frameless Double Glass module, weighing 26.6 kg, requires dedicated clamp systems compatible with glass-glass construction — standard rails and clamps designed for framed modules are not suitable. Installers must plan for the added cost of a compatible racking system and account for the risk of errors during hardware selection. - **Lower-Wattage Variants Trail Top Competitors in Efficiency** - Modules in the 480–490W range of this series achieve efficiencies of 21.57–22.05%, while the JA Solar JAM60S40 LR (up to 510W) claims 23% and the Sunlike SKT490~510M12-108D4 claims 22.93%. For rooftop installations where available area is constrained and maximum yield per m² is the priority, variants ≥500W within this series should be selected, or an alternative from JA Solar considered. ## About this series The DAH DHN-54Z20/DG solar panel series is revolutionizing the market thanks to the use of patented **Full-Screen** technology, which eliminates traditional frames protruding above the glass surface. This solution effectively solves the problem of dust, sediment, and water accumulation at the module edges, which in standard panels leads to the formation of hot-spots and efficiency drops. Thanks to the smooth surface, rainfall automatically removes contaminants, making this series an ideal choice for low-tilt installations where traditional cleaning is difficult. The use of advanced **N-Type TOPCon cells** guarantees excellent efficiency even in low-sunlight conditions and significantly lower linear degradation compared to older technologies. The **Double Glass** construction, meaning the use of dual glass, significantly increases mechanical resistance to extreme weather conditions and enhances the fire safety of the entire system. These products stand out from the competition with their excellent aesthetics and **bifaciality**, allowing for additional energy yield from reflected radiation. The DHN-54Z20/DG series is dedicated to demanding private investors and companies looking for maximum reliability and maintenance-free operation while maintaining the highest energy yields for decades. It is the optimal combination of technical innovation and practical benefit in the form of reduced servicing needs. ## Notable figures - Efficiency of 22.0% matches the \*\*TOPCon 450-500W\*\* median - 220.2 W/m² power density is 5.0 W/m² below \*\*TOPCon 450-500W\*\* median (225.2 W/m²) - requires larger installation area - Temperature coefficient of -0.29%/°C matches the \*\*TOPCon 450-500W\*\* median - At 26.6 kg, this panel is 2.6 kg heavier than the \*\*TOPCon 450-500W\*\* median (24.0 kg) - more demanding for installation crews - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface ## Questions ### What is the Full-Screen technology in DAH Solar DHN-54Z20/DG panels and why does it matter? Full-Screen is a patented DAH Solar design in which the frame does not protrude above the glass surface. As a result, dust, leaves, bird droppings, and rainwater cannot accumulate along the module edges as they do with conventional framed panels. This reduces the risk of hot-spots, enables self-cleaning by rainfall, and maintains higher efficiency without regular maintenance — a particularly important advantage for installations mounted at low tilt angles. ### What warranty does the DAH Solar DHN-54Z20/DG series carry? The DHN-54Z20/DG series is backed by a 25-year product warranty covering material and workmanship defects, as well as a 30-year linear power output warranty under which the manufacturer guarantees at least 87.4% of nominal power after 30 years of operation. This is one of the longest power warranties available on the market, reflecting the Tier 1 quality standard that DAH Solar modules meet. ### Are the DAH Solar DHN-54Z20/DG panels suitable for a rooftop installation with a low tilt angle? Yes, the DHN-54Z20/DG series is exceptionally well suited for low-pitch roof installations. The frameless Full-Screen construction allows rainwater to flow freely across the entire module surface, flushing away contaminants that would otherwise collect along the frame edges of conventional panels. This minimizes the efficiency losses typically associated with shallow-mounted modules and reduces the need for manual cleaning. ### What does the bifacial design of the DHN-54Z20/DG mean in practice, and how much additional energy can it generate? Bifacial design means the module generates power from both sides — capturing direct irradiance on the front face and reflected irradiance from the ground on the rear face. Combined with the Double Glass construction (dual glass replacing a conventional backsheet), the DHN-54Z20/DG can yield an additional 5–20% of energy depending on the albedo of the surrounding surface (e.g., light-colored façades, gravel, or snow). The rated front-side power output is 510 Wp. ### How does the DHN-54Z20/DG series perform under overcast conditions and low irradiance? The N-Type TOPCon cells used in the DHN-54Z20/DG series feature an exceptionally low temperature coefficient for Pmax of −0.29%/°C and excellent response to diffuse low-level irradiance. This translates into higher energy yields on cloudy days compared with older P-Type PERC cells. N-Type technology also exhibits significantly lower linear degradation, resulting in greater cumulative energy production over the full 30-year service life. ### How much does a DAH Solar DHN-54Z20/DG panel weigh, and is it difficult to install? The DHN-54Z20/DG module weighs approximately 26.6 kg and measures 1962 × 1134 × 30 mm. The Double Glass construction adds slightly more weight than backsheet-based modules, so a two-person installation team is recommended. The frameless design requires dedicated clamps engineered for frameless modules — this must be taken into account when selecting the mounting system. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/en-dhn-54z20-dg-480-510w-66a0c3efeea4.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, lighter, +3.0 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, lighter, +2.8 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, lighter, +2.7 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Cooler, lighter, +2.5 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Cooler, lighter, +2.5 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | Cooler, lighter, +2.5 pp | | [DAH Solar DHN-54Z20/DG(BW)-480](https://comparepv.com/panel/dah-dhn-54z20-dg-bw-480) | 480 W | -10 W, -0.4 pp | | [DAH Solar DHN-54Z20/DG(BW)-485](https://comparepv.com/panel/dah-dhn-54z20-dg-bw-485) | 485 W | -0.2 pp | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | +70 W, cooler, +2.8 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | +65 W, cooler, +2.6 pp | | [Longi Solar LR7-60HVHL-550M](https://comparepv.com/panel/longi-lr7-60hvhl-550m) | 550 W | +60 W, lighter, +2.4 pp | | [JA Solar JAT60S40-540/LR](https://comparepv.com/panel/ja-solar-jat60s40-540-lr) | 540 W | +50 W, lighter, +2.4 pp | | [Gokin GK-5-60HG-540M](https://comparepv.com/panel/gokin-gk-5-60hg-540m) | 540 W | +50 W, lighter, +2.4 pp | | [Jinko Solar JKM545-54QL6-DV-F1-EU](https://comparepv.com/panel/jinko-solar-jkm545-54ql6-dv-f1-eu) | 545 W | +55 W, cooler, +2.2 pp | | [Longi Solar LR7-60HVH-545M](https://comparepv.com/panel/longi-lr7-60hvh-545m) | 545 W | +55 W, cooler, +2.2 pp | --- Source: https://comparepv.com/panel/dah-dhn-54z20-dg-490 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.