Data Communication Solutions for PV Module Rapid Shutdown Requirements

California's law requiring solar PV

on every new residential structure, rooftop solar PV, often paired with energy storage, will soon be ubiquitous in the United States. Recognizing this trend and its potential impact on human safety, the National Fire Protection Association introduced new requirements for rooftop solar PV systems in the 2017 edition of “NFPA 70: National Electrical Code®” (a.k.a. NEC 2017). Section 690.12 of NEC 2017, “Rapid Shutdown of PV Systems on Buildings,” requires conductors inside-the-array boundary to be de-energized to 80 volts or less within 30 seconds of initiating a rapid shutdown event. This requirement came into force on January 1, 2020 and is now in effect in 34 states.

While it is possible for solar PV product manufacturers and integrators to fulfill NEC 2017 Rapid Shutdown requirements without a supporting communication system to detect faults and re-energize PV modules, it is more common that a communication system—using Power Line Communications (PLC) or wireless technology—is used for this purpose.

This course is an examination of data communication technologies, deployment techniques, and regulatory considerations associated with PV module rapid shutdown solutions. The course is intended for students interested in exploring technical (e.g. engineering, component design, system design), professional (e.g. solar project development, regulatory compliance, energy policy, supply chain management) and vocational (e.g. system installation, operations & maintenance, site monitoring) careers in the rapidly growing solar energy industry. Students will acquire a foundation in the basic data communication concepts associated with PV module communication solutions and the regulated operating environments these solutions exist within.

Course Highlights:

• Theory of operation of PV module rapid shutdown solutions
• PLC over Direct Current (DC) electrical wiring
• Wireless communication technologies used in PV module rapid shutdown solutions
• Open standard technologies used in PV module rapid shutdown solutions
• NFPA 70: National Electrical Code®, with a focus on Section 690.12
• UL 1741 Certification Requirements Decision (CRD) pertaining to rapid shutdown
• Federal Communication Commission (FCC) regulations pertaining to PLC and wireless networking
• SunSpec Communication Signal for Rapid Shutdown standard and ecosystem
• Educating firefighters, first-responder, and consumers about PV module rapid shutdown solutions
• Multi-PV-module applications of rapid shutdown technologies
• System design, commissioning and troubleshooting considerations of PV module rapid shutdown solutions
• Long-term operational- and supply chain consideration of PV module rapid shutdown solution

Course Benefits:

By the end of this course, students will understand:

• How PV module rapid shutdown regulations came into being and are evolving over time
• Comparative advantages of proprietary and standards-based PV module communication technologies
• Comparative advantages of PLC and wireless protocols in the solar PV environment
• Single-PV module and multi-PV module rapid shutdown system configurations
• The definition of Module Level Power Electronics (MLPE) and the functions MLPE solutions provide
• Regulatory bodies relevant to PV module rapid shutdown and data communication
• End user, first responder, and Authority Having Jurisdiction (AHJ) considerations
• Testing, certification and marking considerations
• Rapid shutdown solutions in the market today

Course Typically Offered: TBD

Prerequisite: N/A. While there are no prerequisites for this course, those with knowledge of PLC and wireless communication solutions for embedded computing devices will benefit the most.

Contact: For more information about this course, please email unexengr@ucsd.edu.

Course Number: ECE-40303
Credit: 1.00 unit(s)