Are DualSun panels compatible with the K2 SingleRail and SolidRail mounting systems?

YES, and this compatibility has been attested by an independent Control Office which has issued a New Technology Investigation (NTI) to confirm it. 

The DualSun FLASH and SPRING panels are therefore compatible with the SingleRail - SolidRail system from K2 Systems : 

• Roof types: Tiles, slates, fiber cement, trapezoidal sheet, sandwich panel, standing seam, corrugated sheet.
• Certification for tile, slate and fiber cement roofs: DualSun SPRING and FLASH panels are integrated in ETN L18.03577
• Possible layouts: Portrait and Landscape

For more details about the installation of DualSun panels on the roof :

What mounting systems can be used to install DualSun Spring panels on roofs? 

To consult the compatibility of DualSun Spring and Flash panels with over-imposition installation systems: Compatible mounting systems – Super-imposition