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Green Energy8 min read

Sizing battery storage for peak-shaving: a field guide

Lessons from three industrial battery retrofits - sizing, payback periods, and the mistakes we see most.

PublishedMay 14, 2026
Reading time8 min
CategoryGreen Energy

Peak-shaving only pays off if the battery is sized against your actual demand curve, not your nameplate capacity. We start every engagement by logging 30 days of interval data before recommending a single kWh of storage.

The most common mistake: oversizing for a rare demand spike that happens twice a year, which triples the payback period for marginal benefit. A right-sized system targeting the 90th-percentile peak usually pays back in 3-5 years.

Battery chemistry matters less than most vendors claim - degradation curves, warranty terms, and the quality of the energy management system controlling dispatch matter far more.

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