DC vs AC Coupled Battery Storage Systems

  • Minimum Conversion Points = Reduced Electricity Waste

  • Single inverter reduces system complexity

  • PV and Battery system are "behind-the-meter" simplifying utility interconnection

  • Faster battery re-charging compared to AC system during extended outages 

DC-Coupled System

Stores DC current electricity in Battery converts DC to AC to serve home load

Generates DC current electricity

DC-Coupled System

  • Multiple conversion points = Wasted Electricity

  • Multiple inverters require more system equipment and communication points, creates increased system failure rate

  • PV system size constrained by utility regulations

  • The charge rate is slower compared to DC system when grid outage occurs

AC-Coupled System

Generates DC current electricity

Converts DC current to AC current

Converts AC to DC and Stores DC current electricity converts back to AC to use stored electricity

Holu Hou Energy LLC 1003 Bishop St. Pauahi Tower Suite 1840, Honolulu, HI 96813 United States

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