Show sizing queries

[hoank]

Hi, I have some queries about inverter and array sizing. When I choose "Show sizing" button to see 2 diagram as below. In the Power sizing characteristics, there are 4 parameter:

- PV array, Pnom (STC): 47500kWp

- PV array, Pmax (50oC): 46476kWdc

- Inverter, Pnom (AC): 42000kWac

- Inverter, Pmax (25oC): 46200kWac

So how can the array Pmax at 50oC (46476kWdc) be calculated? I use the muPmpp -0.4%/oC but the result is 42750kWdc?

array sizing

[André Mermoud]

You are right: this is not really clear.

The PMax value shown here is not taken from the PNom (nameplate) value.

It is the maximum Array power attained ubnder the maximum possible GlobInc, as calculated from the Clear day model in this plane porientation.

[hoank]

So I got that Pmax(50oC) is the combination of Maximum Global Incident Irradiation (in clear day model) and temperature coefficient?

Then my concern is how can we got the Maximum GlobInc (in clear day model) from Maximum GlobInc value, is there any relation with Clearness index Kt or Best clear day Ktcs?

Maximum GlobInc value