Auxiliary Energy Losses – How is the calculation performed?

[Maynara Torres]

How is the calculation of auxiliary losses defined in the Detailed Losses section performed? I entered the plant load power value, and the system returns the percentage value of auxiliary losses based on the value I provided. But how exactly is this percentage calculated? What is the relationship between the load power, the total plant power, and the resulting kWh value?

[Linda Thoren]

Hello,

In the loss diagram, each loss is defined as percentage of the previous energy quantity. In general, if you have defined a continuous auxiliary loss and export an hourly output file, you will see that this value will remain constant, though the percentage it will represent will of course vary depending on the production (if you for instance look at the loss diagram for the different months). 

You can read more about the loss diagram and the auxiliary losses in the following help page:
https://www.pvsyst.com/help/project-design/results/loss-diagram.html
https://www.pvsyst.com/help/project-design/array-and-system-losses/auxiliaries-consumption.html

Please let me know if this answers your question.

Kind regards,