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<< Click to Display Table of Contents >> AC ohmic losses: reference power |
  
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<< Click to Display Table of Contents >> AC ohmic losses: reference power |
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See also AC ohmic loss from inverter to injection point and External transformer losses.
Basically, the AC wiring losses are calculated from the resistivity, i.e. the wire lenght, section and metal. During simulation, at each time step, the power loss is calculated as NWire * Rwire · I².
However in practice, as a first step of the design, people often use the relative ohmic loss. This relative loss should be referred to a specified Power.
Since the version 7.2, you have the opportunity of choosing as reference:
| - | either PNomPV(ac), the PV array nominal power at STC (PNomPV [kWp]), multiplied by the inverter's efficiency. This is the historical choice of PVsyst before the version 7.2. |
| - | or PNom(Inv), the nominal output power of the inverter(s), without temperature correction. |
This choice is done for each project, in the project's settings dialog.
In the main menu "Settings > Preferences > Physical models > AC Loss references", you may define the default initial value when creating a new project.