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A paradigm shift in the evolution of heliostats

Stellio is sbp sonne’s innovative heliostat developed in collaboration with our partners Ingemetal and Masermic. This heliostat has a pentagonal shape which allows for dense heliostat field layouts with little shading and blocking and reduced atmospheric attenuation compared to rectangular heliostats. Its new axis arrangement allows the use of cost-efficient linear actuators for both axes, while the appropriate size and precise optics at low manufacturing costs result in a significantly improved cost/performance ratio.

Moreover, large structural deformations at the reflector corners do not happen with Stellio due to the equal-stiffness rotational symmetric structural concept. Standard float-glass mirrors are assembled in jigs using a smart technology to compensate steel-work inaccuracies. The result is a very precise concentrator.

Stellio does not require canting (alignment of mirror facets), since this is automatically achieved during assembly. Finally, cost for local controller and motor drivers are reduced by using a reliable design based on automotive technology, which ensures that spare electronic components will be available for a long time. While the flat mirror panes and linear actuators are commodity products, the steel structure almost completely consists of sub-assemblies that can be manufactured worldwide.
We offer the Stellio for any CSP tower plants and support in the coordination and quality assurance of the used components and the assembly!

Reflective area
48.5 m²

Mirror type
silvered glass, 4 mm

Mirror reflectivity
93.5 %

Structure materials
hot-dipped and pre-galvanised steel

sheet steel or pre-stressed spun concrete pipe

Drive system
bi-axial slope drive, 110° angle range

linear actuators, brushless DC motors

maintenance-free plain bearings

Control system
EUT15 local controller

Maximum power consumption incl. controller
< 180 W

Average power consumption while tracking per heliostat
< 15 W

Reflector assembly
high-precision jigs, glue-connected mirrors

Optical accuracy
1.5 mrad rms (2D)

Tracking accuracy
0.6 mrad (1D)