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PostPosted: Fri Feb 02, 2018 2:25 pm 

Joined: Thu Mar 17, 2016 7:49 pm
Posts: 8
Dear Andre,

Why the designing criteria, on the "System" window, does not consider the inverter maximum input current as a restriction, warning when the total array short circuit current is higher then the inverter DC current? Isn´t that should be consider a problem in the design?

Thank you in advance


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PostPosted: Fri Mar 02, 2018 7:06 pm 
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Joined: Mon Apr 16, 2012 7:29 pm
Posts: 1566
There are 2 input current limitations in PVsyst:

- At the sizing time: some manufacturers specify a maximum ISC current (or sometimes a maximum PV power) for the array to be connected on the inverter. To my understanding, this doesn't make much sense as the inverter is normally able to limit the input current (or power) by itself.
The only cases where this should be respected are when this is a contractual condition, which affects the warranty. This will provide an error message, and the prohect cannot be created as such.

- During operation, up to now there was a input parameter of the inverter "Minimum Voltage for getting Pnom". This corresponds indeed to an input current limiting, managed by the inverter.
Since recent versions of PVsyst, this current limit may also be explicitly defined, alternatively to VminPnom. These 2 varialbes are closely related: Imax * VminPnom = Pnom !


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PostPosted: Tue Feb 19, 2019 9:01 am 

Joined: Fri Feb 15, 2019 1:21 pm
Posts: 5
- At the estimating time: a few makers determine a most extreme ISC current (or in some cases a greatest PV control) for the cluster to be associated on the inverter. To my understanding, this doesn't bode well as the inverter is ordinarily ready to restrict the info current (or power) independent from anyone else.

The main situations where this ought to be regarded are the point at which this is an authoritative condition, which influences the guarantee. This will give a mistake message, and the project can't be made in that capacity.

- Amid activity, up to now, there was an information parameter of the inverter "Least Voltage for getting Phnom". This relates to being sure to an information current constraining, overseen by the inverter.

Since ongoing variants of PVsyst, this present farthest point may likewise be expressly characterized, on the other hand to VminPnom. These 2 variables are firmly related: Imax * VminPnom = Phnom!

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