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Add FAQ entries for CEC vs Sandia module dbs and multi-inverter systems #1662

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Feb 17, 2023
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Add FAQ entries for CEC vs Sandia module dbs and multi-inverter systems #1662

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add CEC vs Sandia and multiple inverter FAQs
kandersolar Feb 13, 2023
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Update docs/sphinx/source/user_guide/faq.rst
kandersolar Feb 17, 2023
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incorporate reviewer feedback
kandersolar Feb 17, 2023
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fix whatsnew
kandersolar Feb 17, 2023
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21 changes: 21 additions & 0 deletions docs/sphinx/source/user_guide/faq.rst
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Expand Up @@ -138,3 +138,24 @@ so you can check the tables there for more up-to-date tables.
For modules, if even the SAM files don't include the module you're looking for
either, you can calculate CEC module model parameters from
datasheet information using :py:func:`pvlib.ivtools.sdm.fit_cec_sam`.


Which should I use, the CEC or the Sandia PV Module database?
-------------------------------------------------------------

The CEC PV module database contains parameters for significantly more
modules, and is more up to date, than the Sandia PV module database.
Therefore, the CEC PV module database is probably the more useful option
in most cases. However, finding parameters for the specific module
being used is more important than which database they came from.
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How do I model a system with multiple inverters?
------------------------------------------------

Currently, pvlib's :ref:`modelchaindoc` and :ref:`pvsystemdoc` only support
simulating one inverter at a time. To simulate a system with multiple
inverters, define one ``PVSystem`` and ``ModelChain`` per inverter and
run the simulation for each of them individually. From there you
can add up the inverter-level outputs to get the total system output.
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