Solid all-round for its segment
The DAH DHN-66Z16/DG(BW) panel series is a breakthrough solution utilizing patented Full-Screen technology, which effectively eliminates the accumulation of water and dust on the module edges. Thanks to a unique design without traditional frames on the edges, these panels solve the common problem of energy losses resulting from accumulated dirt, which translates into a real increase in efficiency by up to several percent per year. The use of high-efficiency N-Type TOPCon cells ensures higher efficiency and significantly lower material degradation over time, guaranteeing stable profits for the investor for decades. The use of a bifacial Double Glass structure significantly increases mechanical resistance and ensures the modules perform excellently in harsh weather conditions while maintaining an aesthetic appearance. It is an ideal choice for installations on low-tilt roofs, where traditional panels require frequent cleaning and maintenance. Standing out from the competition, this model offers a unique combination of innovative engineering and functionality, providing zero risk of the so-called edge shading effect. It is a professional tool for investors focused on maximizing yields with minimal involvement in the maintenance of the photovoltaic system.
Ranking
Signals from the data
Commercial, utility-scale and hot-climate.
The frameless front surface effectively eliminates dust and water accumulation at module edges. DAH Solar reports a 6–15% generation increase under dusty conditions versus standard aluminum-framed panels. With approximately 4.5 GW of cumulative global shipments, the technology has been validated in real-world conditions, not just in the laboratory.
A peak efficiency of 23.14% places this series on par with direct peer comparables such as Longi Hi-MO 7 (23.1%) and Techwise Solar TOPCon (23.14%). Leapton LP182 reaches only 22.36%, giving DAH a tangible ~0.78 percentage-point advantage at an identical 182 mm cell format.
N-type TOPCon cells are free from the LID (Light-Induced Degradation) effect characteristic of P-type PERC cells and exhibit a lower temperature coefficient (−0.29%/°C), translating into better performance during summer months. The bifacial Double Glass structure captures additional energy from reflected irradiance (bifacial factor up to 85%), realistically increasing annual yield by 5–15% depending on ground albedo.
The manufacturer guarantees retention of more than 87.4% of nominal power output after 30 years of operation. This is among the longest warranty standards in the segment — the Double Glass construction (glass–glass instead of glass–backsheet) directly underpins this warranty by eliminating the rear-laminate degradation of PVF/EVA typical of conventional modules.
DAH Solar maintains an uninterrupted Tier-1 ranking according to BloombergNEF, confirmed in both Q1 and Q4 2025 under tightened criteria (project threshold raised from 5 MW to 10 MW). The manufacturer's bankability reduces financing risk for installations funded by banks and investment funds.
The Double Glass construction (2 mm + 2 mm) results in a module weight of approximately 32.5 kg, compared to the ~22–25 kg typical of glass-backsheet panels in the same format. At high roof-coverage densities, this may necessitate a structural engineering assessment or rafter reinforcement, adding to installation costs — particularly in older buildings.
- Efficiency of 22.9% matches the TOPCon 600-650W median
- At 229.5 W/m² power density, roof space requirements are typical for TOPCon 600-650W panels
- Temperature coefficient of -0.29%/°C matches the TOPCon 600-650W median
- Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface
- #2268 for efficiency, #2165 for temperature performance out of 14005 panels
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 620 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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