Components and Specification of Rapid Shutdown for Roof PV Systems

Solar PV and Energy storage systems are being adapted worldwide, recognized as an environmentally friendly, clean, and resilient solution compared to traditional energy sources such as Fossil-Fuel. However, with the increase of installation on rooftop, risk of potential fire and safety threats, in which fire-fighters and emergency response teams are unable to respond due to risk of shock hazard. Therefore, NEC 2017 introduced Section 690.12, "Rapid Shutdown for PV Systems on Buildings", requires inside the array boundary solar panels to be de-energized to 30 volts or less of initiation of a rapid shutdown event. This paper will be covering the specification objectives, test protocols, approved manufacturers, and previous attempts.