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559 kWh
Commercial energy storage systemDelta Electronics

Delta Electronics AIOC279K125L ESS-1

559 kWh · 125 kW · Lithium Ion · direct PV input

UL 9540UL 1741 SBCEC listed · Oct 1, 2026
  • Nameplate energy559 kWh
  • Continuous power125 kW
  • ChemistryLithium Ion

Overview

CEC Energy Storage System List

AIOC279K125L ESS-1: 559 kWh nameplate energy; 125 kW continuous; lithium ion; accepts solar panels directly (DC-coupled).

Capacity & power

CEC Energy Storage System List

Safety listings

CEC Energy Storage System List
UL 9540 certifies the whole storage system; UL 9540A is the fire-propagation test that fire codes ask for indoors and near walls.

California grid & code compliance

CEC Energy Storage System List

Questions & answers

How much energy does the Delta Electronics AIOC279K125L ESS-1 store?

559 kWh nameplate, per the California Energy Commission list.

Is the AIOC279K125L ESS-1 UL 9540 certified?

Yes — the CEC list shows UL 9540 certification (certified by tuv rheinland of north america).

Sources

  1. California Energy Commission — Energy Storage System List, data as of Oct 7, 2026. Manufacturer-reported values confirmed by CEC against certificates.