Lithium-ion chemistry basics and the LFP vs. NMC trade-off, BESS system architecture (battery, BMS, PCS), kWh vs. kW and the C-rate, backup/self-consumption/demand-charge/grid-services use cases, and thermal-runaway safety fundamentals.
A battery energy storage system (BESS) is the piece of equipment that lets energy produced at one time — a solar array's midday peak, a wind turbine's overnight gust — be used at another. This module works through the lithium-ion chemistry landscape and the LFP-versus-NMC decision specifically, the battery-BMS-PCS architecture every BESS shares, the kWh-versus-kW-versus-C-rate distinction that governs sizing, and the major use cases — backup, self-consumption, demand charge management, and grid services — a BESS can be configured to serve.
By the end of this module you should be able to explain why kWh capacity and kW power rating answer two completely different sizing questions, and how the battery management system's continuous per-cell monitoring functions as a genuine safety system against thermal runaway — ideas Module 6's microgrid content and Module 16's commissioning content each return to from their own angle.