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

www.solarSEAN.com

www.HeatSpring.com/SEAN