--- title: "DAH Solar DHN-66Z20/DG/FS-620 620W Solar Panel - Specs & Review | ComparePV" description: "DAH Solar DHN-66Z20/DG/FS-620 620W solar panel. Specs: 22.95% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/dah-dhn-66z20-dg-fs-620" updated: 2026-09-11 --- # DAH Solar DHN-66Z20/DG/FS-620 Solid all-round for its segment 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** DAH Solar - **Model:** DHN-66Z20/DG/FS-620 - **Series:** DHN-66Z20/DG/FS - **Rated power:** 620 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 600-650 W (1086 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 620 W | 620 W | Typical | | | Module efficiency | 22.95% | 22.80% | Typical | 2,268 | | Power density | 229.5 | 227.7 | Typical | 2,191 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 32.3 kg | 32.7 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.95% | 22.80% | Typical | 2,268 | | Power density | 229.5 | 227.7 | Typical | 2,191 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 52.1 | 53.1 | Typical | 5,543 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Commercial and utility-scale. ## Specification ### Electrical - **Rated power (Pmax):** 620 W - **Efficiency:** 22.95 % - **Voltage at Pmax (Vmp):** 41.30 V - **Current at Pmax (Imp):** 15.01 A - **Open-circuit voltage (Voc):** 48.60 V - **Short-circuit current (Isc):** 16.00 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:** 28 mm - **Weight:** 32.3 kg - **Area:** 2.70 m2 - **Power density:** 229.5 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:** 542 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 2268 of 14005 | | Power density | 2191 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 5543 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Patented Full-Screen Technology** - The absence of a front-edge frame allows rainwater and dust to drain freely, eliminating sediment buildup along the bottom edge. DAH claims an energy yield improvement of 6–15% versus conventional modules, particularly at roof tilt angles below 15°, where soiling accumulation is a critical performance factor. - **Up to 23.14% Efficiency — Segment Leader** - Peak module efficiency of 23.14% places this series on par with the Longi Hi-MO 7 (23.1%) and Techwise TOPCon 132 (23.14%), and ahead of the Leapton LP182 (22.36%). The power range of 585–625 Wp across 9 variants provides flexibility to match available roof area while maintaining high power density. - **N-Type TOPCon — Low Thermal Degradation** - N-type TOPCon technology eliminates light-induced degradation (LID) characteristic of P-type PERC cells and delivers a superior temperature coefficient (typically −0.30%/°C vs. −0.35%/°C for PERC), resulting in measurably higher annual energy yield in high-irradiance locations. - **85% Bifaciality + Double Glass** - The double glass construction achieves 85% bifaciality, enabling additional energy harvest from ground albedo. Dual glazing also provides enhanced resistance to alkalis, salt corrosion, and moisture ingress, which is critical for agri-PV, coastal, and ground-mount installations. - **BNEF Tier 1 — Confirmed Q1–Q4 2025** - DAH Solar maintained BNEF Tier 1 status across all four quarters of 2025, confirming the manufacturer's bankability and eligibility for project financing by lending institutions. This designation is a standard requirement for commercial investments above 1 MWp. ## Cons - **Higher Module Weight (~32.5 kg)** - The Double Glass construction results in a module weight of ~32.5 kg, approximately 4–5 kg more than typical glass-foil modules of equivalent power class (~28 kg). Retrofit installations on older rooftops require a structural load-bearing assessment, adding engineering costs to the project budget. - **Frameless Design — Mounting Requirements** - The absence of a frame requires dedicated mounting hardware compatible with frameless modules. Not all standard racking systems carried by distributors support this format, which may extend project timelines or increase BoS costs compared to conventional aluminum-framed modules. ## About this series The DAH DHN-66Z20/DG/FS solar panel series is a breakthrough solution utilizing patented **Full-Screen** technology. The unique design without frame edges on the front side allows water and dust to flow freely from the module surface, which eliminates the problem of sediment accumulation on the bottom edge. As a result, these panels offer a real increase in energy yields of 6-15 percent compared to traditional models, especially at low roof pitch angles. The use of **N-type TOPCon** cells guarantees the highest efficiency and minimal degradation over time, which translates into stable power production for decades. The use of **Double Glass** technology, meaning double-sided glazing, provides the modules with exceptional mechanical resistance and durability in harsh environmental conditions. This bifacial series allows for **additional energy recovery** from the back of the module, making it ideal for large commercial installations and roofs where every watt of power counts. DHN-66Z20/DG/FS solves the problem of frequent panel cleaning and the risk of hot-spots caused by dirt. This solution is dedicated to investors focusing on **maximum maintenance-free operation** and innovations that realistically increase the profitability of the PV system by eliminating losses caused by contamination. ## Notable figures - At 22.9% efficiency, this panel is on par with typical \*\*TOPCon 600-650W\*\* modules - Power density of 229.5 W/m² matches the \*\*TOPCon 600-650W\*\* median - Temperature coefficient of -0.29%/°C matches the \*\*TOPCon 600-650W\*\* median - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces - Ranked #2268 out of 14005 panels for efficiency in the database ## Questions ### What is Full-Screen technology in the DAH Solar DHN-66Z20/DG/FS panels, and what practical benefits does it offer? Full-Screen technology means the panel has no horizontal frame rail on its front face. As a result, rainwater and dust flow freely across the entire module surface instead of accumulating at the bottom as they do with conventional framed panels. In practice, this translates into a measurable energy yield increase of 6–15%, which is especially significant on low-tilt roofs (below 15°) where standard panels tend to soil rapidly and suffer noticeable performance losses. ### Are the DAH Solar DHN-66Z20/DG/FS panels suitable for flat or low-pitch roofs? Yes, and that is precisely where they perform best. The DHN-66Z20/DG/FS series was designed with low-tilt installations in mind, including roof pitches as shallow as 10°, where conventional panels lose output due to dirt accumulation. The Full-Screen construction effectively eliminates this issue. The module's large footprint (2382 × 1134 mm) combined with its bifacial design makes it particularly cost-effective on roof surfaces covered with light-colored membranes or white gravel ballast. ### What warranty does DAH Solar provide for the DHN-66Z20/DG/FS panels? DAH Solar offers a 15-year product warranty covering material defects and workmanship, along with a 30-year linear power output warranty. The linear power warranty guarantees that the module will maintain a specified minimum power output level throughout the entire 30-year period. N-type TOPCon cells exhibit extremely low annual degradation rates, meaning the panel will still operate at high efficiency after three decades of service. ### How much does the DAH Solar DHN-66Z20/DG/FS panel weigh, and can a standard roof structure support it? The module weighs approximately 32.5 kg with dimensions of 2382 × 1134 × 30 mm. This is heavier than typical single-glass panels because the DHN-66Z20/DG/FS series uses a double glass (bifacial glass-glass) construction. A structural load assessment is advisable before installation, particularly on older timber-framed roofs. On standard reinforced-concrete rooftops and trapezoidal steel sheet structures, the double glass configuration does not pose a load concern. ### What does the bifacial design of the DHN-66Z20/DG/FS panels actually deliver — do they genuinely generate power from both sides? Yes. The rear glass allows light reflected from the underlying surface — rooftop, ground, or gravel — to reach the cells and be converted into additional electricity. The real-world bifacial gain ranges from a few percent up to roughly 15%, depending on the albedo of the surface beneath the array. Light-colored membranes or white gravel deliver a greater boost than dark roofing felt. Combined with N-type TOPCon cell technology and module efficiency approaching approximately 23%, this makes the DHN-66Z20/DG/FS one of the highest-performing modules available in its power class. ### Is DAH Solar a reliable manufacturer, and is the DHN-66Z20/DG/FS series still available? DAH Solar is listed on the Bloomberg NEF Tier 1 module manufacturer ranking, which confirms the company's financial stability and manufacturing quality. The company holds IEC 61215, IEC 61730, ISO 9001, and ISO 14001 certifications. The DHN-66Z20/DG/FS series is currently in active production and available for purchase. The module is offered in power variants ranging from approximately 585 Wp to 625 Wp, with higher power variants (up to 650 Wp) available in the latest datasheet revisions. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/en-dhn-66z20-dg-fs-585-625w-0951a0033909.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +30 W, lighter, +2.2 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +2.1 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +50 W, lighter, +1.9 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +50 W, lighter, +1.9 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +1.9 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +50 W, cooler, +1.9 pp | | [DAH Solar DHN-66Z20/DG(BW)-585W](https://comparepv.com/panel/dah-dhn-66z20-dg-bw-585w) | 585 W | -35 W, -1.3 pp | | [DAH Solar DHN-590Z16/DG(BW)](https://comparepv.com/panel/dah-dhn-590z16-dg-bw) | 590 W | -30 W, -1.1 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +60 W, lighter, +2.2 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +55 W, lighter, +2.1 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +80 W, cooler, +2.1 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +75 W, cooler, +1.9 pp | --- Source: https://comparepv.com/panel/dah-dhn-66z20-dg-fs-620 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.