AC or DC coupling: Which to use for your next storage project?

By Kathie Zipp Storage can be incorporated into new or existing solar projects through AC or DC coupling, but the guidelines for when to use each architecture are not black and white.
A DC-coupled system at the Duke Energy Mt. Holly microgrid in North Carolina. Source: Duke Energy
When adding storage to a new or existing solar project, there are two main ways to integrate the two sources—either through AC or DC coupling. Each is representative of where the battery is connected—the AC or DC bus.
Unfortunately, choosing the right method for a project isn’t straightforward. Each has its own pros and cons, but by using

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