Quick Answer
AC disconnects are typically used in solar systems for safety and ease of use, while DC disconnects are preferred for direct current systems and can be smaller and more cost-effective.
AC Disconnects in Solar Systems
AC disconnects are the preferred choice for many solar systems due to their ease of use and compliance with electrical codes. They are designed to handle the alternating current (AC) flow from the inverter and are typically installed before the main electrical panel. AC disconnects usually require a minimum of 1000VA of power handling and can be 2-pole or 3-pole. For example, an Eaton 2-pole AC disconnect can handle up to 800A of current.
DC Disconnects for Solar Systems
DC disconnects, on the other hand, are used for direct current (DC) systems and are typically installed in the DC circuit between the solar array and the charge controller or inverter. DC disconnects are usually required by local electrical codes for safety reasons and can be smaller and more cost-effective than AC disconnects. A DC disconnect with a 200A rating and a 2-pole configuration is sufficient for many residential solar systems, such as the Square D by Schneider Electric DC disconnect.
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