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529 kWh

Commercial energy storage systemDelta Electronics

Delta Electronics EIS-UExxxK3H1

529 kWh · 125 kW · Lithium Ion

UL 9540CEC listed · Apr 1, 2022

Nameplate energy529 kWh
Continuous power125 kW
ChemistryLithium Ion

Overview

CEC Energy Storage System List

EIS-UExxxK3H1: 529 kWh nameplate energy; 125 kW continuous; lithium ion.

Capacity & power

CEC Energy Storage System List

Nameplate energy (CEC)529 kWh
Rated power (CEC)125 kW
Max continuous discharge (CEC)125 kW
Full-power discharge timeabout 4.2 h at full power
ChemistryLithium Ion
Grid connection480 V

Safety listings

CEC Energy Storage System List

UL 9540 (energy storage system)Certified by TUV Rheinland
Certificate date & editionSep 29, 2021 · Ed. 2 : 2020

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

UL 1741 SB (IEEE 1547-2018)No
UL 1741 SA (Rule 21)Yes
CSIP (IEEE 2030.5)Yes (with conditions)
JA12 declaration (Title 24)No
Monitor Key Data schedulingYes

Questions & answers

How much energy does the Delta Electronics EIS-UExxxK3H1 store?

529 kWh nameplate, per the California Energy Commission list.

Is the EIS-UExxxK3H1 UL 9540 certified?

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

Sources

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