While DC microgrids are the most common source of energy for these systems, with photovoltaic (PV) panels, wind turbines and energy storage systems being the primary sources of energy, do not discount the more common AC systems. AC and DC power sources will be required to supplement our normal power grid, but new power systems under development may be totally separate from the grid and can be switched from utility to stand-alone power.To become more familiar with DC micro-grids, electricians, electrical contractors and electrical engineers must know Article 712, covering DC microgrids that are not designed to interface with the utility company power. Article 705 is also important because it deals with primary sources of power, including utility company power supplies, which are often called interconnected electrical power production sources.
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