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 Post subject: multiple orientations, single mpptPostPosted: Thu Mar 17, 2016 2:49 am

Joined: Thu Mar 17, 2016 2:33 am
Posts: 1
Hi all,

I am trying to run a simulation of a 100kW system.

The system contains 1 central inverter with 1 MPPT.

However the panels have 3 orientations that are slightly different to each other.

I understand with 2 orientations, i can use the mixed #1 and #2 option, however what if there were 3 orientations connected to one tracker, is there a way to run an successful simulation?

Thank you.

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 Post subject: Re: multiple orientations, single mpptPostPosted: Sun Mar 20, 2016 1:44 pm

Joined: Mon Apr 16, 2012 7:29 pm
Posts: 1680
PVsyst only treats the mix of 2 orientations on a given MPPT input.
If you have 3 orientations, you should define an average between two of them. The results will not be very different.

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 Post subject: Re: multiple orientations, single mpptPostPosted: Mon Feb 24, 2020 11:49 am

Joined: Fri Feb 21, 2020 11:45 am
Posts: 1
Quote:
PVsyst only treats the mix of 2 orientations on a given MPPT input.
If you have 3 orientations, you should define an average between two of them. The results will not be very different.
When do you mean with average between them? Lets consider an extreme case where we have 2 orientations: -90S and +90S. The average would be 0S (??) but the result couldn´t be more misleading.
I am trying to compare mismatch losses of central inverters and string inverters for minor differences in orientation.

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 Post subject: Re: multiple orientations, single mpptPostPosted: Wed Mar 04, 2020 11:07 pm

Joined: Mon Apr 16, 2012 7:29 pm
Posts: 1680
The simpler way is to redefine your inverter with 3 MPPT inputs, and attribute one sub-array to each input.

The mismatch between orientations (i.e. between strings in different orientations) is usually very low (a fraction of %). You can check this by defining one sub-array with a "mixed" orientation. Here the calculation is correct, as it uses the mix of both I/V curves.

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