RE: [EnergyPlus_Support] PhotovoltaicPerformance:EquivalentOne-Diode

(Re PS) That’s right, in Version 3.1 there is a known bug (now fixed for next release) where some indexes are messed up during input checks. When using more than one different Sandia or one-diode performances objects, you need to use a work around which is to include the same count of dummy simple PV performance objects in the file.

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Morgan Goff
Sent: Tuesday, September 01, 2009 5:20 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] PhotovoltaicPerformance:EquivalentOne-Diode

Yeah I figured it was something like that. I used the standard value of 1.12eV for the bandgap, much like the examples in the I/O Reference. I decided to use a similar PV panel by a different company and got it to work. Thanks for your help Brent

Morgan

P.S. (Possible Bug)

I noticed that when a performance one diode object is referenced by a generator:photovoltaic that performance obj must be the first one. I can't have another object (another performance), then the one referenced follow. If I run the simulation like this I will get an error of "Invalid Performance object name". Same thing happens with the Sandia performance object. It would seem that the program tries to read in the performance obj but only checks the first obj and not any that may follow. Doesn't really affect me, just something I noticed.

On Tue, Sep 1, 2009 at 12:29 PM, Griffith, Brent <brent.griffith@nrel.gov> wrote:

It sounds like the set of input data are not consistent or are not complete. Are you also changing the other fields like open circuit voltage? The bandgap and the number of cells in series have to be consistent with the overall array power and voltage. I have seen this happen before and it was bad input; we also see the same outcome in the TRNSYS implementation of the same model.

From: EnergyPlus_Support@yahoogroups.com [mailto:EnergyPlus_Support@yahoogroups.com] On Behalf Of goff.morgan
Sent: Tuesday, September 01, 2009 1:15 PM
To: EnergyPlus_Support@yahoogroups.com
Subject: [EnergyPlus_Support] PhotovoltaicPerformance:EquivalentOne-Diode

Hello,

I have a problem when running my simulation when I try to input my own parameters, which are from the PV manufacturer. I input the data and the simulation runs fine when I tell it there are the "default" number of cells in series (36). But the panel actually has 60, and when I use that value the simulation crashes, the full crash, no warnings or errors. I tried multiples of 36 (i.e. 72) but that didn't work.

I'm not sure if there is a mathematical problem during calculation.

Thanks,
Morgan

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