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548 kWh

Commercial energy storage systemSungrow

Sungrow STxxxKWH-250A

548 kWh · 250 kW · Lithium Ion

UL 9540CEC listed · Sep 27, 2019

Nameplate energy548 kWh
Continuous power250 kW
ChemistryLithium Ion

Overview

CEC Energy Storage System List

STxxxKWH-250A: 548 kWh nameplate energy; 250 kW continuous; lithium ion.

Capacity & power

CEC Energy Storage System List

Nameplate energy (CEC)548 kWh
Rated power (CEC)250 kW
Max continuous discharge (CEC)250 kW
Full-power discharge timeabout 2.2 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 of North America
Certificate date & editionAug 30, 2018 · Ed. 1 : 2016

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)No
JA12 declaration (Title 24)No
Monitor Key Data schedulingNo

Questions & answers

How much energy does the Sungrow STxxxKWH-250A store?

548 kWh nameplate, per the California Energy Commission list.

Is the STxxxKWH-250A UL 9540 certified?

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

Sources

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