Light for its output, no clear weak spot
The Dark PHENex Bifacial series is built for installers and investors looking for panels that combine sleek aesthetics with real energy performance. The modules use half-cut cell technology along with a dense busbar grid, reducing shading losses and improving resistance to microcracks. The distinctive, fully black frame and cell backing let the panel blend seamlessly with any roof type without sacrificing output - a solid fit for customers who care as much about the look of their installation as its efficiency. The defining feature of the series is dual-sided bifacial technology, which captures reflected light on the rear side of the module, boosting overall energy yield without increasing the footprint. The panels are PID-resistant, ensuring stable performance throughout their service life. The design works well on both pitched roofs and ground-mounted installations, supporting on-grid and off-grid systems, including commercial projects. The series comes with a 25-year product and performance warranty, making it a safe long-term choice for installers seeking a proven, aesthetic, and high-performing photovoltaic solution.
Ranking
Signals from the data
Residential and commercial.
Top 17% of the PERC 400-450 W segment, against a median of 53.0.
Top 18% of the PERC 400-450 W segment, against a median of 206.2.
Top 23% of the PERC 400-450 W segment, against a median of 20.60%.
Half-cut cells combined with a dense busbar grid reduce power loss under partial shading and improve resistance to microcracks compared to conventional full-size cells, resulting in more stable real-world energy yield.
The module captures reflected irradiance from the rear side with a bifaciality ratio of approximately 65±5% (manufacturer data), increasing total energy output without enlarging the installation footprint - particularly beneficial over bright ground surfaces (gravel, white roofing).
The fully black frame and cell backsheet preserve high power output (up to 410 Wp) and efficiency up to 21% while delivering a premium look, distinguishing this series from cheaper full-black panels that sacrifice several percentage points of efficiency for aesthetics.
Philadelphia Solar, founded in 2007 and recognized as Tier-1 bankable, offers a 25-year product and performance warranty (min. 86% power retention after 25 years) - matching the warranty terms of comparable series VDS-S144/FNH and Sunket SKT410~430M10-108D4, providing comparable investment security.
PID degradation resistance ensures stable operation throughout the module's lifetime, and the design suits both sloped roof and ground-mount installations, in on-grid, off-grid, and commercial-scale projects.
The series relies on the older PERC cell technology, while the comparable Luxor Solar Eco Line N-type TOPCon Bifacial series reaches a higher efficiency of 21.33% at the same maximum power of 410 Wp. N-type cells also typically show lower LID/LeTID degradation than PERC.
The bifaciality ratio is 65±5% per manufacturer data, a moderate figure compared to premium glass-glass bifacial modules reaching 70-85%, limiting the additional energy yield captured from ground-reflected irradiance.
- At 21.0% efficiency, this panel is on par with typical PERC 400-450W modules
- 210.3 W/m² power density - 4.1 W/m² more than PERC 400-450W median (206.2 W/m²), more power per roof area
- Temperature coefficient of -0.35%/°C matches the PERC 400-450W median
- Weight of 20.5 kg (1.5 kg below PERC 400-450W median of 22.0 kg) allows easier transport and roof mounting
- Bifacial design (65% factor) captures reflected light - adds 3-10% yield on ground-mount or white roof
Specifications
Datasheet charts
Measured curves published by Philadelphia Solar in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 410 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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About the DARk PHENex Bifacial series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.