pv producing negative electric power

energyplus
photovoltaic
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After running building simulation with photovoltaic panels using Sandia model, I got this warning: Generator: photovoltaic named tiltedpv is producing negative electric power.I am using simple ideal inverter with the generator rated 20000 watts.I defined number of modules in series and series string in parallel to be 1.Does anyone know why this issue occurred?

Lucy

asked 2017-02-27 20:38:53 -0500

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__AmirRoth__

updated 2017-02-28 10:35:43 -0500

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That warning can happen when the Sandia model gets wacky. It seems this usually hits when the sun is near the horizon, and wouldn't be producing any significant power yet anyway. But often it appears that the model input coefficients are the culprit. The Sandia model has a vast number of input coefficients and getting a set that is internally consistent is a challenge.