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  5. Sunto - STO (Solar Tracker Optimizer) ...

Sunto - STO (Solar Tracker Optimizer) System

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The STO System is engineered to enhance the tracking precision of single-axis solar trackers. Utilizing a meticulous approach, it continuously monitors the tilt of photovoltaic modules, analyses deviation from optimal positions, and computes parameters for tilt correction, ensuring optimal alignment and increased energy output. At its core, the STO System incorporates three primary algorithms: the ephemeris algorithm for tracking the sun's position based on time and geographic coordinates, the shadowing algorithm to address inter-tracker shading effects, and the ground tilt algorithm to adjust for east-west ground tilt variations. These features are vital for improving the performance ratio of PV installations and preventing financial drawbacks from inefficiencies. Tested in large-scale plants like those managed by Enel Green Power, the STO System has consistently raised energy production by 2-5% annually. The system is delivered as a portable unit comprising multiple STO components, an industrial-grade tablet, and essential accessories, all securely housed in a robust, waterproof enclosure.
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STO is a system that tests and optimizes the tracking accuracy of single-axis solar trackers.

It accurately monitors second by second the inclination of PV modules, analytically calculates the deviation from the optimal tilt, and generates the tilt-correction parameters delivering optimized alignment and maximized energy production.

  • Suitable for all types of single-axis solar trackers
  • Battery-powered
  • Optimal tilt curve calculated also in uneven ground conditions
  • Easy clamp-on installation
  • Automatic calculation of the production loss (Kw/h) generated by the error detected with respect to the optimal tilt curve implementable
 

The optimal angle is calculated by STO itself through a combined set of algorithms:

  • the ephemeris algorithm, which calculates the position of the sun on the basis of time and local GPS coordinates
  • the shadowing algorithm, which calculates the mutual shadowing generated by adjacent trackers
  • the ground tilt algorithm, which calculates the mutual mismatch due to the East-West tilt of ground in any possible ground configuration.

Very often the tracking accuracy of mono-axial systems is lower than expected. Minor undetected mismatches between the actual and the optimal tilt curve can easily cause the Performance Ratio to drop below the contracted value, resulting in financial penalties and in lost annual revenues ranging from tens of thousands of Euro for a 5 MW installation, up to several million Euro for a GW plant.
STO has been conceived for delivering accurate insight on the tracking accuracy of such systems, and for optimizing their operating parameters during the phases of field test and of plant operation.