Running SAM .lk script from Python

  • pgilman
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16 Dec 2020 22:49 #9124 by pgilman
Replied by pgilman on topic Running SAM .lk script from Python
Hi Joel,

The general definition is:

DC - AC Ratio = Array DC Nameplate Capacity (kWdc) / Inverter AC Nameplate Capacity (kWac)

To calculate the ratio, assuming you are using the Sandia Inverter model and CEC Module Model with Database Paramters model, you could write Python code based on this pseudocode:

pdc = get( cec_imp_ref ) * get( cec_v_mp_ref)
pac = get( inv_snl_paco )
dc_ac_ratio = pdc / pac

Where get() is whatever function you are using to read the values of SSC input variables. Those values should all be in kW,.

Thanks,
Paul.

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  • joel3003
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17 Dec 2020 00:21 #9127 by joel3003
Replied by joel3003 on topic Running SAM .lk script from Python
Hi Paul,

Thank you so much! This is very helpful to what I am doing. Just wondering, how would the pseudocode formulas you have written change if I am using CEC for both the inverter and the module? Specifically, I am using "CEC Performance Model with Module Database" and "Inverter CEC Database".

Thanks,
Joel

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  • pgilman
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17 Dec 2020 20:56 #9130 by pgilman
Replied by pgilman on topic Running SAM .lk script from Python
Hi Joel,

The "Inverter CEC Database" model is the same as the Sandia Inverter model, whose input variable names mostly start with "inv_snl_". Sorry these model names are so confusing.

Thanks,
Paul.

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  • joel3003
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28 Jan 2021 00:24 #9243 by joel3003
Replied by joel3003 on topic Running SAM .lk script from Python
Hi Paul,

Thanks for your help - I have managed to solve the issue!
A follow up question: How would I be able to tell if my simulation is using the '6par_' module parameters as opposed to the 'cec_' module parameters? Does it always default to cec? or is there a way to change the simulation between using 6par and cec for the modules?

Kind regards,
Joel

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  • pgilman
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28 Jan 2021 22:53 #9245 by pgilman
Replied by pgilman on topic Running SAM .lk script from Python
Hi Joel,

Use 'module_model' to set the model option. There is a description here:

nrel-pysam.readthedocs.io/en/master/modules/Pvsamv1.html#module-group

Best regards,
Paul.

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