Middle of its segment, modest efficiency
The DAH DHN-66Z16/DG 585-625W series is a range of modules designed to maximize energy yields on large roof areas and in PV farms, where every square meter counts, and stable operation under variable conditions is crucial. These modules utilize N-type TOPCon cells, which are known for their lower degradation over time and better performance at high temperatures and in low-light conditions - making energy production more predictable in the Polish climate.
The bifacial design combined with double glass allows for the utilization of reflected light from the ground, while also increasing resistance to environmental factors. This is a significant advantage in areas where competing modules degrade more quickly due to moisture, UV radiation, or PID. Furthermore, manufacturing processes, such as LECO (laser-assisted sintering), support high efficiency without compromising durability.
This is a good choice for installers, investors, and designers seeking modules for industrial, commercial, and utility applications, with a focus on long-term reliability and high energy yields.
Ranking
Signals from the data
Commercial, utility-scale and hot-climate.
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.
A peak efficiency of 23.14% places this series at the top of its peer group — on par with Techwise Solar (23.14%) and Longi Hi-MO 7 (23.1%), and well above the Leapton LP182 (22.36%). In practical terms, this translates to a meaningfully smaller roof or ground footprint required to achieve the same installed capacity.
A Pmax temperature coefficient of –0.29%/°C outperforms the PERC baseline (typically –0.35%/°C). Under Central European summer conditions — with module temperatures reaching approximately 70°C — this results in roughly 2–3% higher energy yield compared to PERC modules of equivalent STC power rating.
The manufacturer guarantees a minimum of 87.4% of rated power after 30 years of operation. Many competing Tier-1 modules — including older Leapton series and Longi Hi-MO 5/6 — offer warranties of up to 25 years at ~84.8–86%. The extended warranty horizon improves project IRR in financial models for utility-scale plants exceeding 10 MW.
DAH Solar has maintained BNEF Tier 1 status continuously across all quarters of 2025 (confirmed for Q1 and Q4 2025). This enables utility-scale project financing through banks and investment funds without additional manufacturer credit enhancement requirements.
The combination of N-type TOPCon cells — with inherently low LID/LeTID — and a glass-glass construction eliminates moisture- and UV-induced degradation while reducing PID to virtually zero. Bifacial gain is estimated at 5–15% depending on ground albedo, providing a tangible energy bonus particularly in ground-mounted installations with light-colored gravel or white geomembrane surfaces.
The glass-glass construction results in a module weight of 32.5 kg at dimensions of 2,382×1,134×30 mm. Comparable glass-backsheet modules — such as the Longi Hi-MO 7 in its single-glass configuration — typically weigh approximately 22–25 kg. On rooftops with limited structural capacity (older industrial buildings, lightweight steel structures), an additional structural engineering assessment is required, increasing overall project cost.
- Efficiency of 21.8% is 0.6pp below the TOPCon 550-600W median (22.4%)
- At 218.4 W/m², this panel generates 6.0 W/m² less per unit area than TOPCon 550-600W median (224.4 W/m²)
- Temperature coefficient of -0.29%/°C matches the TOPCon 550-600W median
- At 32.5 kg, this panel is 1.3 kg heavier than the TOPCon 550-600W median (31.2 kg) - more demanding for installation crews
- Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface
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.
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