High direct current to alternating current ratios and short time intervals can lead to overestimations of photovoltaic system production. Modeling photovoltaic systems with a 1.4 DC:AC ratio in the southeastern United States using 60-minute intervals resulted in a 2.1% overestimation compared to using instantaneous inputs and outputs. Averaging inputs and outputs over time can miss short-term clipping losses, particularly for systems with high DC:AC ratios.