Middle of its segment, modest efficiency
The DAH DHN-66Z16/DG(BW) 585-625W series is designed to maximize energy yield on large mounting areas - without compromising on durability. These are bifacial modules that can effectively utilize reflected light from the ground, making it easier to increase energy production in real-world conditions where every additional percentage of yield matters.
A key advantage of this series is the N-type TOPCon technology - which ensures stable performance over time, good efficiency in low-light conditions, and better performance at high temperatures. The dual glass construction enhances resistance to moisture, UV radiation, and corrosive agents, which is particularly important in installations exposed to harsh environments.
The use of LECO technology supports more efficient current flow in the module, leading to better efficiency without the need for "marketing hype." This is a good choice for PV farms, building roofs, and commercial projects where reliability, long-term performance, and predictable yield are important.
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.
The Pmax temperature coefficient of -0.29%/°C is significantly better than typical PERC cells (-0.35%/°C) and on par with key competitors (LONGi Hi-MO 7: -0.29%/°C). In Polish climatic conditions, where summer module temperatures routinely reach 65–70°C, this difference translates into measurably higher annual energy yield.
DAH guarantees at least 87.4% of nominal power output after 30 years of operation, with an annual degradation rate of approximately 0.4% following the first year. This represents one of the longest warranty horizons in the volume segment — a peer-comparable module, the Leapton LP182-M-78-NH, carries a standard 25-year warranty, not 30.
The top variant in the series achieves 23.14% module efficiency — identical to the Techwise Sun-Pursuit Plus TOPCon and higher than the Leapton LP182-M-78-NH (22.36%). This reduces the roof or ground area required to reach the target system capacity, which is a key advantage on constrained rooftops or sites.
The glass-glass design (2 mm/2 mm) eliminates backsheet cracking risk and minimizes moisture ingress — critical for installations exposed to condensation or freeze-thaw cycles. The bifacial configuration, with a bifaciality factor of ~80%, enables meaningful rear-side energy harvest from ground-reflected irradiance, particularly on light-colored industrial floors or snow-covered surfaces.
DAH Solar has maintained BloombergNEF Tier 1 status across consecutive quarters, including Q4 2025, under BNEF's tightened criteria requiring project financing of ≥10 MW. This directly supports access to project finance and lowers residual risk for both installers and investors.
At 32.5 kg, the module is above average for the 132-cell format. Older roof structures on industrial halls or commercial buildings may require an additional structural engineering assessment prior to installation, adding cost and lead time that lighter competing modules would not necessitate.
Despite its Tier 1 status, DAH Solar falls outside the top five global manufacturers by shipment volume, which is dominated by LONGi, JA Solar, Trina Solar, Jinko Solar, and Canadian Solar. In the Polish market, this may translate into longer warranty claim processing times and a more limited local service footprint compared to the market leaders.
- Module efficiency of 21.8% is 0.6pp below average for TOPCon 550-600W panels (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)
- At -0.29%/°C, hot weather performance is typical for TOPCon 550-600W panels
- At 32.5 kg (1.3 kg above TOPCon 550-600W median of 31.2 kg), requires checking roof load capacity
- 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