--- title: "DAH Solar DHN-54Z20/DG(BW)-485 485W Solar Panel - Specs & Review | ComparePV" description: "DAH Solar DHN-54Z20/DG(BW)-485 485W solar panel. Specs: 21.80% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/dah-dhn-54z20-dg-bw-485" updated: 2026-09-11 --- # DAH Solar DHN-54Z20/DG(BW)-485 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(BW)-485 - **Series:** DHN-54Z20/DG(BW) - **Rated power:** 485 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) | 485 W | 465 W | Strong - top 20% | | | Module efficiency | 21.80% | 22.52% | Weak - bottom 12% | 7,022 | | Power density | 218.0 | 225.2 | Weak - bottom 12% | 7,014 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 26.6 kg | 24.0 kg | Weak - bottom 17% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.80% | 22.52% | Weak - bottom 12% | 7,022 | | Power density | 218.0 | 225.2 | Weak - bottom 12% | 7,014 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 54.8 | 52.2 | Weak - bottom 17% | 9,243 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **218.0 watts per square metre** - Bottom 12% of the TOPCon 450-500 W segment, against a median of 225.2. - **21.80% module efficiency** - Bottom 12% of the TOPCon 450-500 W segment, against a median of 22.52%. - **54.8 kg per kWp** - Bottom 17% of the TOPCon 450-500 W segment, against a median of 52.2. - **Best for:** Residential, commercial and hot-climate. - **Not ideal for:** Roofs where every square metre has to count, tight roof space and weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 485 W - **Efficiency:** 21.80 % - **Voltage at Pmax (Vmp):** 33.30 V - **Current at Pmax (Imp):** 14.56 A - **Open-circuit voltage (Voc):** 39.30 V - **Short-circuit current (Isc):** 15.52 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:** 218.0 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:** 424 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7022 of 14005 | | Power density | 7014 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 9243 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Linear power warranty: 87.4% output after 30 years** - DAH Solar guarantees a minimum of 87.4% of nominal power output after 30 years of operation, clearly outperforming JA Solar DeepBlue 4.0 (84.7% after 30 years) — a direct competitor in the same 510 Wp peak-power class. The 2.7 percentage-point difference over a thirty-year installation lifetime translates into measurably higher cumulative energy yield and a superior LCOE. - **Temperature coefficient Pmax: -0.29%/°C** - The -0.29%/°C temperature coefficient is significantly better than that of standard PERC modules (-0.35%/°C). At typical summer module operating temperatures in Poland of 55–65°C, this difference yields approximately 1.7–2.1% higher instantaneous power output compared to PERC technology, with a direct positive impact on annual summer energy yield. - **Glass-glass bifacial construction (~80% bifaciality factor) — no compromises** - The glass-glass design with a bifaciality factor of ~80% enables utilization of light reflected from the ground surface, realistically increasing energy yield by 5–25% over a monofacial equivalent. The greatest gains are achieved on high-albedo surfaces (white TPO/PVC membranes, gravel, snow), carports, and ground-mounted farms — all typical commercial and prosumer applications in the Polish climate. - **Confirmed Tier-1 BNEF status (Q1 and Q4 2025)** - DAH Solar is continuously listed on the BloombergNEF Tier-1 module manufacturer ranking, confirmed for at least Q1 2025 and Q4 2025. This status is a standard qualification requirement for project bankability reviews conducted by financial institutions and leasing providers in Poland, effectively reducing financing risk for the investor. - **Efficiency up to 22.92% — top tier of the segment** - The top variant of the series (510 Wp) achieves 22.92% module efficiency, placing it just below JA Solar JAM60S40 LR (23.0%) and Sunlike Solar SKT510 (22.93%), and 1.72 percentage points above Trina Solar Vertex (21.2%). The series competes directly with the highest-efficiency modules available in the 480–510 Wp power class. ## About this series The DAH DHN-54Z20/DG(BW) series is designed for high energy production on a limited surface area - without compromising durability and aesthetics. These double-sided, glass-glass modules can utilize reflected light from the ground, effectively increasing energy yield where other panels stop functioning at the front. In practice, this means more cost-effective installations on sunny roofs, carports, ground-mounted structures, or in modern commercial projects. The **N-type (TOPCon) cells** are particularly noteworthy, as they help maintain stable performance over time and perform well in challenging conditions. The series also features **technology to minimize the risk of microcracks**, which translates into greater reliability during transportation and installation on roofs. Another key feature is **low degradation and a long linear warranty**, which is important for investors who are planning for long-term energy costs. This is the choice for those who expect **maximum yield** and predictable performance of the installation in the Polish climate. ## Notable figures - Efficiency of 21.8% is 0.7pp below the \*\*TOPCon 450-500W\*\* median (22.5%) - 218.0 W/m² power density is 7.2 W/m² below \*\*TOPCon 450-500W\*\* median (225.2 W/m²) - requires larger installation area - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 450-500W\*\* panels - 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 warranty is offered on the DAH Solar DHN-54Z20/DG(BW) panels? The DHN-54Z20/DG(BW) series comes with a 25-year product warranty and a 30-year linear power output warranty. This means the manufacturer guarantees a specified minimum energy yield for three decades. Thanks to the N-type TOPCon cell technology, the annual degradation rate is lower than that of conventional P-type modules. This is one of the longest warranty packages currently available on the market. ### What does it mean that the DAH Solar DHN-54Z20/DG(BW) panel is bifacial, and does it make sense on a Polish rooftop? Bifacial means the module generates power from both the front glass and the rear glass by capturing diffuse and reflected light from the surrounding surface. With the glass-glass construction used in this series, the bifacial gain is tangible on light-colored rooftops, carports, and ground-mounted arrays. In the Polish climate, where snow reflects significant irradiance during winter months, the bifacial design provides an additional boost to energy yield. ### What is the highest wattage available in the DAH DHN-54Z20/DG(BW) series? The highest peak power available in the DHN-54Z20/DG(BW) series is 510 Wp. This corresponds to a module efficiency of approximately 23%, placing this series among the top-tier N-type TOPCon panels available in Poland. The high per-module power output allows a more powerful system to be built within the same roof area. ### Do the DAH Solar DHN-54Z20/DG(BW) panels perform well on overcast days and at high temperatures? Yes. TOPCon cells exhibit a low temperature coefficient, which means reduced power losses during heat waves compared to PERC modules. They also perform well under the diffuse irradiance typical of Polish autumn and winter conditions. The glass-glass construction enhances resistance to moisture ingress and UV radiation, resulting in more stable performance throughout the entire service life. ### Are the DAH Solar DHN-54Z20/DG(BW) modules suitable for ground-mounted installations and carports? Yes. The glass-glass construction and bifacial design of this series make the modules well suited for ground-mounted arrays and carports, where mechanical durability and the ability to capture reflected light from the ground are particularly important. The modules withstand snow loads up to 5,400 Pa and wind loads up to 2,400 Pa, meeting the structural requirements of Polish climatic zones. ### Is DAH Solar a reliable manufacturer, and is the DHN-54Z20/DG(BW) series still available? DAH Solar (Anhui Daheng Energy Technology Co., Ltd.) is a Chinese manufacturer listed on Bloomberg's Tier 1 module ranking, operating since 2009 and exporting panels to more than 100 countries. The DHN-54Z20/DG(BW) series is active and available through distribution channels in Poland. Tier 1 status implies bankability — meaning the modules are accepted as collateral by financial institutions funding PV projects. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/en-dhn-54z20-dg-bw-480-510w-084128fe67e5.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, lighter, +3.2 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, lighter, +3.0 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, lighter, +2.9 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Cooler, lighter, +2.7 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Cooler, lighter, +2.7 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | Cooler, lighter, +2.7 pp | | [DAH Solar DHN-54Z20/DG(BW)-480](https://comparepv.com/panel/dah-dhn-54z20-dg-bw-480) | 480 W | -0.2 pp | | [DAH Solar DHN-54Z20/DG(BW)-490](https://comparepv.com/panel/dah-dhn-54z20-dg-bw-490) | 490 W | +0.2 pp | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | +75 W, cooler, +3.0 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | +70 W, cooler, +2.8 pp | | [Longi Solar LR7-60HVHL-550M](https://comparepv.com/panel/longi-lr7-60hvhl-550m) | 550 W | +65 W, lighter, +2.6 pp | | [JA Solar JAT60S40-540/LR](https://comparepv.com/panel/ja-solar-jat60s40-540-lr) | 540 W | +55 W, lighter, +2.6 pp | | [Gokin GK-5-60HG-540M](https://comparepv.com/panel/gokin-gk-5-60hg-540m) | 540 W | +55 W, lighter, +2.6 pp | | [Jinko Solar JKM545-54QL6-DV-F1-EU](https://comparepv.com/panel/jinko-solar-jkm545-54ql6-dv-f1-eu) | 545 W | +60 W, cooler, +2.5 pp | | [Longi Solar LR7-60HVH-545M](https://comparepv.com/panel/longi-lr7-60hvh-545m) | 545 W | +60 W, cooler, +2.4 pp | --- Source: https://comparepv.com/panel/dah-dhn-54z20-dg-bw-485 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.