How can I calculate the PR of different plants?

[RobertoSIM]

Hi!!

I am designing a PV system in 4 warehouses. Each building has its own tilt and azimut, and due to the limitation of PVsyst on the creation of sub-arrays (8 maximum) I cannot calculate the generation of the 4 warehouses together. So I did 4 different PVsyst, one for each building.

But now I have to provide the PR of the whole project. The PR is calculated as follow:

PR = E_Grid / (GlobInc * PnomPV)

For E_Grid and PnomPV I can sum all the energy and the total power peak installed, but for GlobInc is not possible

I thought to do the weighted sum of each PR using the E_Grid of each building. Do you think this can be the solution?

Thanks for your help!

[André Mermoud]

The right way is to sum all the values of the numerator, and all the values of the denominator.

I.e. divide the sum of all E_Grid by the sum of all (GlobInc * PnomPV) products.