October 9, 2019

Go Big, Go DC: An In-Depth Look at DC-Coupled Solar-Plus-Storage

As the costs of solar PV modules continue to reduce, and those of batteries follow a similar downward trajectory, solar-plus-storage is in growing demand among utilities and solar developers. To further push down the levelized cost of energy of solar-plus-storage and maximize the amount of MWh of solar-generated electricity that can be fed into the grid, energy suppliers and developers are turning to direct current (DC) coupling these installations. Compared with alternating current (AC) coupling, DC coupling the PV array and the battery storage system in front-of-meter installations, such as utility-scale plants, is a much newer, less standardised approach.

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