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The decrease in solar photovoltaic (PV) system costs and regulatory barriers coupled with increased financial incentives and climate awareness has led to rapid deployment in both commercial and residential sectors. As solar is an intermittent resource, PV systems can negatively impact electricity grid stability due to increased power ramp-rates and temporal misalignment between energy production and load. Distributed systems, especially rooftop mounted residential, present a range of geometric alignments and spatial separation that when aggregated introduce temporal diversity. If these features reduce barriers to integration with the electricity grid, then they should be weighed against increased costs per rated power compared to larger commercial systems. To aid in such assessments, we compare power production data from 44 diverse residential PV systems spread across a large municipality (1200 km), and one large rooftop commercial installation (660 kW) within the same area. These production data were used to calculate 5 and 15-minute ramp rates and were contrasted against provincial load. The aggregated residential PV systems ramp rates never exceeded 10% per 5 minutes, while a large central installation experienced this nearly 2000 times in a one-year period. Additionally, the centralized system experienced ramp rates exceeding 50% per 5 minutes 17 times and had a peak ramp rate of 65% per 5 minutes once in the year. These results are consistent with a previous study conducted in the region using pyranometers, supporting the use of measured irradiance data for planning

Comparison of Centralized and Distributed Photovoltaic System Power Intermittency Based on Measured Data at the Municipal Scale