U.S. Department of Energy Energy Efficiency and Renewable Energy

Utility-Interconnected Photovoltaic Systems: Evaluating the Rationale for the Utility-Accessible External Disconnect Switch

This report examines the utility-accessible external disconnect switch debate in the context of utility-interactive PV systems for residential and small commercial PV installations. It focuses on safety, reliability, and cost implications of requiring an external disconnect switch.

January, 2008
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M.H. Coddington, R.M. Margolis, and J. Aabakken (NREL)