Efficiency leader, no clear weak spot
The DAH DHN-66Y18/DG photovoltaic panel series revolutionizes the approach to efficiency through the use of unique, patented Full Screen technology. The lack of a protruding frame at the edges allows water and sediment to flow off freely, which effectively eliminates the problem of dust and mud accumulation at the module boundaries. This innovative solution directly translates to higher energy yield, reducing power losses caused by dirt by up to 15 percent annually compared to traditional designs. The use of advanced N-type TOPCon cells ensures not only higher base efficiency but also significantly better performance in diffused light conditions and lower degradation over time. The robust Bifacial Dual Glass construction enables double-sided energy generation while maintaining the highest resistance to harsh weather conditions, making these modules an ideal choice for modern home installations and professional photovoltaic farms. Thanks to the minimalist front frameless design, the system requires significantly less frequent maintenance, which is a key advantage for investors who value time and money savings. Choosing this series is an investment in technology that realistically solves the problem of edge sediments, offering stable and high power production where standard solutions lose their efficiency.
Ranking
Signals from the data
Commercial, utility-scale and hot-climate.
Top 15% of the TOPCon 700-750 W segment, against a median of 23.00%.
Top 18% of the TOPCon 700-750 W segment, against a median of 230.2.
Top 19% of the TOPCon 700-750 W segment, against a median of 52.9.
The absence of a protruding front frame eliminates dust and debris accumulation along module edges. DAH Solar claims up to 15% reduction in soiling-related power losses per year compared to standard framed modules, which directly translates into higher annual energy yield without additional cleaning expenditure.
N-type TOPCon cells exhibit an annual degradation rate of ~0.43%/year (derived from the ≥87% power output warranty after 30 years), outperforming the typical ~0.55%/year of PERC cells. N-type technology also delivers a higher bifaciality factor and superior efficiency under diffuse irradiance conditions, which is particularly relevant in the Polish climate.
A bifaciality factor of ~80% (±5%) enables an additional 5–25% energy gain from ground-reflected irradiance, depending on the installation's albedo. The glass-glass construction eliminates PID risk, provides resistance to moisture and UV degradation, and offers mechanical load resistance of up to 5,400 Pa (snow) / 2,400 Pa (wind) per manufacturer datasheets.
DAH Solar offers a 30-year linear power warranty with a minimum threshold of ≥87% of nominal output after 30 years, alongside a 15-year product warranty. This is comparable to the best offerings in the bifacial dual glass Tier-1 segment (Tongwei, TCL Zhonghuan), providing a solid foundation for project bankability.
DAH Solar has maintained BNEF Tier 1 status throughout all quarters of 2025 (Q1–Q4 2025 confirmed). This status is required by the majority of project finance institutions and insurance underwriters, facilitating financing for commercial and utility-scale PV projects.
The dual glass construction results in a module weight of 39.5 kg, approximately 5–7 kg more than comparable monofacial modules in the same power class (~32–34 kg). This necessitates roof load-bearing verification and may increase installation labor costs; the frameless front also reduces compatibility with some racking systems designed for standard aluminum-framed modules.
- At 23.3% efficiency, this panel is on par with typical TOPCon 700-750W modules
- At 233.4 W/m² power density, this panel generates 3.2 W/m² more per unit area than TOPCon 700-750W median (230.2 W/m²)
- At -0.29%/°C, hot weather performance is typical for TOPCon 700-750W panels
- At 36.7 kg, this panel is 1.3 kg lighter than TOPCon 700-750W median (38.0 kg) - easier handling during installation
- Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof
Specifications
Datasheet charts
Measured curves published by DAH Solar in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 725 Wp appear here. The rest cover the whole series.
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.
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