PV Modules and Inverters not in Database

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Paul Gilman
PV Modules and Inverters not in Database

If you are using SAM's detailed photovoltaic model for a photovoltaic system that uses a module or inverter that is not included in SAM's libraries, you can use the CEC Performance Model with User Entered Specifications or Inverter Datasheet options on the Module and Inverter input pages, respectively. Those options allow you to enter data from a manufacturer's data sheet. Behind the scenes, SAM generates the coefficients it needs to model the equipment.

Once you enter the specifications, you can use the Save ane Load buttons at the bottom of the input page to save them to a text file to use with other SAM files or to share with your colleagues.

On the Module page, choose CEC Performance Model with User Entered Specifications:

Screenshot of detailed PV CEC Performance Model with User Entered Specifications option.

On the Inverter page, choose Inverter Datasheet:

Screenshot of inverter data sheet option on Inverter input page.

When you use these options, you are relying on data provided by the manufacturer. For equipment that is in SAM's libraries, you may find that the manufacturer data differs from the data in the library. That is because the libraries use data provided to the California Energy Commission that includes performance parameters provided by testing laboratories. For more information about how inverters and modules are added to the CEC databases, see the Go Solar California website.

Best regards,
Paul.

piphomer
piphomer's picture

Hi Paul. Can I save and name inverters created this way, or do I need to recreate them every time I start a new model?

Paul Gilman

Hello,

There is not a way to save "user entered" specifications. To avoid having to recreate the inverter, you could start your project by opening an existing file with the inverter you want to model, and then modifying the other inputs. (Note that you can choose "Change Model" on the case menu to change the financial model of a case without changing the performance model inputs.

Please let me know how much of an inconvenience this is to you -- we could consider making it possible to save custom parameters.

Best regards,
Paul.

Paul Gilman

As of SAM version 2016.3.14 the input pages for the inverter and module options with user-entered specifications have new Save and Load buttons that allow you to save parameters to a text file to use with different SAM files.

Best regards,
Paul.

airplaneturn

Thanks!

chetanagrawal
chetanagrawal's picture

We need to also undertand that the compatibiity of various Inverters, Modules, and battery are important. Hence, a functionality needs to be built into the softwre which would see this integrations. I have used the PVSOL, and I have seen this there.

Also, regular update of database is required.

Ali.Akhlaghi

Dear Mr. Gilman,

I have a question related to the CEC performance model with user-entered specifications. In this section, how does SAM calculate the series and shunt resistors? Due to the fact that there is no input for them and as I have seen in the CEC model of SAM documents, the model needs it at least to calculate voltage of DC array output.
With the best regards,

Ali

Paul Gilman

Dear Ali,

When you use the CEC performance model with user-entered specifications, SAM calculates the single-diode model parameters, and reports them in the results. You can find them on the Data Tables tab of the Result page -- the output variable names all begin with "CEC 6-parameter."

Best regards,
Paul.

Ali.Akhlaghi

Dear Paul,

Thank you for your reply. I have found it. It is super interesting and genius.

With the best regards,
Ali

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