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BESS

500 kW commercial peak-shaving BESS

This commercial BESS single line diagram shows a 500 kW, 1 MWh lithium iron phosphate storage system connected to an office-campus main switchboard. The bidirectional power conversion system charges from the 480Y/277 V bus and discharges to reduce utility demand during selected peaks. A feeder breaker provides the AC connection, while the battery enclosure is shown on the DC side of the PCS.

UPDATED 2026-09-23
TYPESld
USE-CASEBess Storage
EXAMPLE500 kW commercial peak-shaving BESS
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CASE ANALYSIS

Scenario

An office campus is reducing monthly demand peaks by charging a containerized battery off-peak and discharging at its main switchboard.

Key decisions

  • The demand meter is upstream of the main switchboard so imported demand is visible.
  • A 500 kW PCS connects through an 800 A feeder breaker.
  • The battery enclosure is rated 1.0 MWh at 1000 Vdc.
  • The e-stop and fire interlock is shown as a dedicated safety input to the PCS.

When to reuse this

This is suitable for behind-the-meter demand management where export is not the main objective. Site fault duty, fire code, and utility control requirements must be checked.

FAQ

Frequently asked questions

What is peak shaving?01
The battery discharges during high demand intervals to reduce power imported from the utility.
Why use LFP cells?02
Lithium iron phosphate is commonly selected for stationary storage because of its thermal and cycle-life characteristics.
Can this system export power?03
It can if approved and configured for export, but this drawing focuses on behind-the-meter load reduction.
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