Sean White‘s Solar and Energy Storage Podcast

Energy Storage Systems (ESS) and the NEC with Bill Brooks and Sean White Part 4

Feb 1, 2024

Bill Brooks and Sean White discuss energy storage system (ESS) Codes, supply-side connections, power control systems, conductor sizing, bonding, tap rules, and the importance of power source capacity alignment. They also touch on PV system installations, cable limiters, dual grounding points, and smart energy management systems for panel overload prevention.

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Introduction

00:00 • 2min

Detailed Analysis of PV System Installation Codes and Power Control Systems

02:18 • 2min

Detailed Discussion on Conductor Sizing and Installation Regulations in Electrical Systems

04:16 • 3min

Understanding Changes in Bonding and Grounding Regulations

07:03 • 22min

Power Control Systems in Energy Storage

28:34 • 5min

Smart Energy Management Systems for Panel Overload Prevention

33:10 • 2min

In this podcast we have Bill Brooks and Sean talking energy storage system (ESS) Codes, with emphasis on interconnections, including supply-side and load side connections.

Be sure to get Sean and Bill’s latest book, which is the 3rd edition of PV and the NEC, based on the 2023 NEC.

To find where to get different versions of the NEC including the 2023 NEC for free check out the NEC tab at solarSEAN.com.

Disclaimer: This podcast was recorded in 2021.

Supply-side connections (source connections to a service), 705.13 Power Control Systems (Energy Management Systems), ampacity of service conductors are allowed to have ampacity less than the main breaker in chapter III of the NEC, 200A PV system on 100A service with power control system, conductor sizing for supply-side connection,

Article 230 Services, houses not smaller than 100A or old services less than 100A, supply-side overcurrent protection locations, cable limiter distances, cable currents just handle fault currents (not overloads), 250.25, 250.24, bonding supply-side connection like a service required, two single points of system grounding, load-side connections, dedicated overcurrent protection device and disconnect, backfeeding a Tesla at 70W, busbars, 120% rule, suitable for backfeed, feeders, Hawaiian tie-in, tap rules, 10-foot tap rule, 25-foot tap rule, synchronous generators, busbars, 705.12(B)(3)(1) 100% rule, 705.12(B)(3)(2) 120% rule, 705.12(B)(3)(3) sum rule or sum of the branch circuit breakers, two single pole breakers with sum rule, 705.12(B)(3)(4) center fed 120% rule, 705.12(B)(3)(5) engineering supervision/multiampacity busbars and the 200% rule, 705.12(B)(3)(6) feed-through connectors, switchgear, 705.13 Power Control Systems with CTs, power control system certifications, allows more power than 120% rule (705.13 was re-named in 2023 NEC as Energy Management Systems), Article 625 sequencer for EVs, no-export is a power control system, export set at certain kW, physical protection of a Powerwall, residential code vehicle impact protection for ESS in garage, wheel stops, bollards, preventing overloading panel, smart panels, smart load centers.

Note: for visuals, download the NEC presentation at www.solarSEAN.com and look for the pdf downloads.

Links:

Bill Brooks, P.E.: www.brooksolar.com