Strong in heat, no clear weak spot
The Solarspace SS9-66HD 645-670M series are large-format modules designed to maximize energy yield from a limited surface area and ensure stable operation in demanding conditions. The use of bifacial construction allows for a real increase in energy production by utilizing reflected light from the ground - which works particularly well on roofs with light-colored membranes, carports, and ground-mounted installations.
The half-cut architecture also deserves attention, as it reduces losses at connections and improves the module's performance under partial shading - a common scenario, for example, along the edges of roofs, chimneys, or rows of structures. Another distinguishing feature is the anti-reflective glass coating, which supports efficient radiation collection in less favorable lighting conditions.
This is a good choice for investors who value not only high yield but also predictability - this is facilitated by the long linear power warranty and a robust, weather-resistant construction with a sealed connection box. The SS9-66HD series is aimed at C&I and PV farm projects, where performance from each module and ease of scalability are key.
Ranking
Signals from the data
Commercial, utility-scale and shaded-installations.
Top 6% of the PERC 650-700 W segment, against a median of -0.340. Ranked 8,545th in the whole database.
Top 18% of the PERC 650-700 W segment, against a median of 212.5.
Top 20% of the PERC 650-700 W segment, against a median of 21.25%.
- At 21.6% efficiency, this panel is on par with typical PERC 650-700W modules
- At 215.7 W/m² power density, this panel generates 3.2 W/m² more per unit area than PERC 650-700W median (212.5 W/m²)
- At -0.33%/°C, hot weather performance is typical for PERC 650-700W panels
- Weight of 37.5 kg is 3.0 kg above PERC 650-700W median (34.5 kg) - verify structural support
- Bifacial design (70% factor) captures reflected light - adds 4-10% yield on ground-mount or white roof
Specifications
Datasheet charts
Measured curves published by Solarspace in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 670 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 1390 panels of the same or similar size to this one, within ±10 mm. See them here Found 1400 panels of the same or similar size to this one, within ±25 mm. See them here Found 1400 panels of the same or similar size to this one, within ±50 mm. See them here Found 1432 panels of the same or similar size to this one, within ±100 mm. See them here