BESS
Acronym for: Battery Energy Storage System
System of batteries (typically LFP or NMC) storing solar electricity for use when the sun isn't shining.
Detailed Explanation
BESS (Battery Energy Storage System) pairs solar panels with batteries to shift generation to evening use, provide backup power, or participate in grid services (frequency regulation, peak shaving). In 2026, lithium iron phosphate (LFP) dominates due to safety, long cycle life (6000+ cycles), and cost ($90-130/kWh residential, $65-95/kWh utility). Major BESS manufacturers: BYD, CATL, EVE, Pylontech (residential); Sungrow, LiSolar, Trina (utility). Common sizes: 5-15 kWh residential, 50-200 kWh C&I, 600-3000 kWh utility containers.
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