Middle of its segment, needs the roof space
The DAH DHN-66Z20/DG(BW) series redefines performance standards through the use of patented Full-Screen technology. Unlike traditional modules, these panels lack a protruding frame at the edges, which completely eliminates the problem of water accumulation and dust or dirt deposits. This solves the key problem of power drops caused by soiling, which is particularly important at low roof tilt angles where traditional solutions often fail. The use of advanced N-Type TOPCon cells ensures significantly higher efficiency and better performance in low-light conditions, translating into stable and high energy yields throughout the year. The durable Dual Glass construction combined with bifaciality makes the modules extremely resistant to extreme weather conditions and capable of generating additional energy from reflected light. This is an ideal solution for demanding investors seeking maximum self-consumption and minimal system maintenance costs. This series stands out from the competition due to the absence of losses resulting from edge soiling, making it unrivaled in residential installations and commercial projects. By choosing these modern modules, you gain a guarantee of longevity and higher investment profitability thanks to minimal annual degradation and high resistance to the PID effect.
Ranking
Signals from the data
Residential, commercial and utility-scale.
Roofs where every square metre has to count and tight roof space.
Bottom 24% of the TOPCon 550-600 W segment, against a median of 224.4.
Bottom 24% of the TOPCon 550-600 W segment, against a median of 22.44%.
Peak efficiency of 23.14% (625 Wp variant) places the series on par with the Techwise Solar Sun-Pursuit Plus TOPCon (23.14%) and ahead of the LONGi Hi-MO 7 (23.1%), with a clear margin over the Leapton LP182 (22.36%). The wide power range of 585–625 Wp across 9 variants enables precise system sizing without wasting usable roof area.
The frameless front surface prevents accumulation of dust, water, and moss at the module edge — a critical concern for installations at tilt angles below 15°. DAH Solar reports cumulative Full-Screen shipments exceeding 4.5 GW across global markets, confirming field-proven technology maturity.
N-Type TOPCon cells exhibit an annual degradation rate of ~0.4% (vs. ~0.55% for PERC) and are free from light-induced degradation (LID), translating into meaningfully higher cumulative energy yield over a 30-year service life. Bifacial gain (typically +5–15% rear-side energy contribution depending on ground albedo) further improves system economics on light-colored roofing surfaces or gravel ballast.
DAH Solar has maintained BNEF Tier 1 status continuously since 2024 (confirmed Q1–Q4 2025 and Q1 2026), a prerequisite imposed by financial institutions for bankable PV project financing. The 30-year linear power warranty represents the maximum offered in the dual-glass TOPCon segment.
TÜV testing confirms a front-side load rating of 5400 Pa and a rear-side rating of 2400 Pa — identical to the benchmark set by premium framed modules. The dual-glass construction additionally provides superior UV and moisture resistance compared to conventional polymer backsheets, a particularly relevant advantage in the Polish climate.
The frameless dual-glass construction weighs approximately 32.5 kg, compared to ~25–26 kg for framed modules of comparable power output (e.g., LONGi Hi-MO 7 625M). A per-panel weight difference of ~6–7 kg translates to roughly 130 kg of additional roof load for a 20-module array, and increases the complexity of rooftop installation logistics.
The Full-Screen frameless design is incompatible with standard mid- and end-clamps used for framed modules. Installation requires specialized dual-glass clamps (DG-clamps, e.g., Schletter or K2 Systems), which are not included in typical racking kits available through Polish distributors. This may increase BoS costs by 5–15% and necessitates compatibility verification with the mounting structure prior to project award.
- At 22.0% efficiency, this panel is on par with typical TOPCon 550-600W modules
- At 220.3 W/m², this panel generates 4.1 W/m² less per unit area than TOPCon 550-600W median (224.4 W/m²)
- At -0.29%/°C, hot weather performance is typical for TOPCon 550-600W panels
- Weight of 32.5 kg is 1.3 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 595 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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