my inversor has 5 MPPTs but I only wanna use 4

[Estagiario]

im only using 4 out of 5 mppt, and in "number of inversor" is just 0.8, not even a full inversor, does it make diference on the simulation??

[André Mermoud]

I don't understand well. Your system defines indeed 5 MPPT inputs  (1+1+2+1).

Are you sure that your inverter  is defined with 5 MPPT inputs (this is not in the PVsyst database) ?

It probably defines 6 MPPT, so that the number of inverters is 0.83 (with one only decimal).

The simulation will work correctly. The only effect would be the possible overload losses, as it is not possible to use the Power sharing option with incomplete inverters.