Stephen Pisklak

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To estimate shade impact to a PV array, standard practice is to measure solar access at the corners of an array and interpolate the shade impact to the modules in between. 3D modeling techniques, however, show that structural shade impact is highly localized. Diffuse light conditions can further reduce the impact of shading. In regions with many overcast(More)
The commonly-used photovoltaic system performance estimators allow for only a single inverter input. New products, however, have multiple inverter inputs. To use these estimators with the newer products, a “Straight-Sum” method is typically employed: each string is treated as an independent array and the results are mathematically summed. The(More)
Studies have shown how to combine snow depth measurements with commonly available meteorological data to estimate the contribution of snow cover to PV power loss. A key input to these methods is daily representative snow depth data, which exist within the NSRDB's TMY2 dataset. NREL's System Advisor Model pairs a snow impact algorithm with TMY2 data. This(More)
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