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5 Operation SMA Solar Technology AG
54 SDesign-BA-BEN120432 User Manual
4. To change the displacement power factor cos φ for inverters with reactive power capability,
adjust the cos φ depending on the selected inverter. Here, the displacement power factor cos
φ has an impact on the nominal power ratio of the inverter with reactive power capability. The
minimum possible value for the displacement power factor cos φ is dependent on the selected
inverter with reactive power capability:
•Select [Project data] in the navigation bar.
•In the "Inverter grid connection" area, deactivate the "Specification for displacement power
factor cos φ" field.
•Select [PV plant] in the navigation bar.
In the "Number x inverter name" tab, select the desired sign in the "Displacement power
factor cos φ" field and enter the desired displacement power factor:
5. To adjust the string assignment for the selected inverter, select the "Strings" tab and change the
string assignment as desired.
6. Check the selected combination of PV array and inverter in the area for design evaluation and
adjust if incompatible. Take note of the information in the "Help" area when doing this.
Design part project automatically
1. To only take into account certain inverters in the automatic design, select [Select inverter
categories].
☑The "Inverter categories" window opens.
Activate or deactivate the desired selection fields and select [OK].
The selected filter is used for the inverter suggestions.
2. In the "Inverter" tab, select [Design automatically].
Sunny Design automatically adds suitable inverters to the project tree.
Message is displayed that no design suggestions could be determined.
The selected number of modules or the selected peak power is so low that no design
suggestions could be determined.
Check whether the selected number of modules or peak power is correct.
Check whether the filters for the inverter categories are closed.
Sign Explanation
+ overexcited in the generator reference-arrow system
underexcited in the generator reference-arrow system
Shorten calculation duration for automatic design
Depending on the size and number of the PV arrays and the suitable inverters, the calculation
duration can increase for design suggestions.
To shorten the calculation duration, you can change the specification for the calculation
(see Section 6.11"Change Specification for Calculation of Design
Suggestions",page64) or limit the inverter categories.
54


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