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What information are you trying to get from modeling the solar panels? If you are just trying to get the kWh produced for the array in a year you can use NREL's PV Watts calculator. Then you can post-process the kWh produced by the panels separately from your OS model. If you want to have it in the model, E+ has a object called "Generator:Photovoltaic". See the E+ InputOutputReference for more information on this object. You can put this object in your OS model with a script.