Middle of its segment, modest efficiency
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.
Ranking
Signals from the data
Commercial and utility-scale.
Tight roof space and roofs where every square metre has to count.
Bottom 15% of the TOPCon 550-600 W segment, against a median of 22.44%.
Bottom 15% of the TOPCon 550-600 W segment, against a median of 224.4.
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.
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 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.
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.
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.
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.
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.
- At 21.8% efficiency, this panel is 0.6pp below the TOPCon 550-600W median of 22.4%
- 218.4 W/m² power density is 6.0 W/m² below TOPCon 550-600W median (224.4 W/m²) - requires larger installation area
- At -0.29%/°C, hot weather performance is typical for TOPCon 550-600W panels
- Weight of 32.3 kg is 1.1 kg above TOPCon 550-600W median (31.2 kg) - verify structural support
- 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 590 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.
Found 1119 panels of the same or similar size to this one, within ±10 mm. See them here Found 1125 panels of the same or similar size to this one, within ±25 mm. See them here Found 1236 panels of the same or similar size to this one, within ±50 mm. See them here Found 1917 panels of the same or similar size to this one, within ±100 mm. See them here