Integrated inverter algorithms for optimal performance
Steca inverters are equipped with various sophisticated functions that can be used to optimize the performance of solar installations. Two of these are ModuleScan and ShadingScan.
- The ShadingScan automatically optimizes solar power in case of shading.
- ModuleScan can be used for troubleshooting, diagnostics, or feed-in improvements
ShadingScan: Optimal solar power even in shaded areas
If solar power systems are to deliver optimal yields, they need direct sunlight. But even with carefully planned and constructed systems, temporary shading is often unavoidable - for example, due to dormers or other structures on the roof. In such cases, the ShadingScan function of Steca inverters avoids unnecessary yield losses by quickly tracking to the current, actual maximum power point (MPP).
In order for a photovoltaic system to deliver maximum yields, the inverter must continuously detect the maximum power of the connected modules. In technical jargon, this value is called the maximum power point (MPP). This depends on the current solar irradiation and therefore changes depending on the time of day and cell temperature.
The MPP is usually not determined for individual solar modules, but for a certain number of modules connected together, also called string. As long as the sun shines evenly on all modules in a string, there is only one unique power maximum for it. Every modern inverter can recognize this.
However, the situation is different if parts of a string are in the shade, which often happens in practice: Then there is not only one, but several MPPs. In this case, conventional inverters are no longer able to select the optimal MPP. The result: noticeably less solar power is generated than possible.