Change the Default Option of "AC losses power reference"

[kjs55]

I suggest changing the default option of "AC losses power reference" in Project Settings from "PNomPV(ac) at STC" to the more physics-correct "PNom (inverters)". Thanks.

I'm running PVsyst v7.3.

[jacob]

Thanks for the recommendation. Do you know how to chart or plot PNom(Inv)? It is not completely clear to me if this is a static variable or if the simulation varies the power used in the ohmic calculations based on AC generation at each hour in the simulation. Do you have any insight?

 

thanks,

[Ajay Deepak]

AC loss with Pnom is accurate as it is considered Inverter power for percentage loss calculation. 

Example case: Inverter Power is 200kW, and DC power connected to the inverter is 250kWp.

AC loss at STC level = 1.5% of 250kWp which is wrong and loss values will be lesser. 

AC loss at Pnorm (Inverter) = 1.5% of 200kW which is correct and loss values will be slightly higher than the previous case.

 

Regards,

Ajay.