Cali-Graf in Southern California

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573 kWh

Commercial energy storage systemSungrow

Sungrow STxxxkWh-xxxkW-2h-US

573 kWh · 250 kW · Lithium Iron Phosphate

UL 9540UL 1741 SBCEC listed · Jan 2, 2025

Nameplate energy573 kWh
Continuous power250 kW
ChemistryLithium Iron Phosphate

Overview

CEC Energy Storage System List

STxxxkWh-xxxkW-2h-US: 573 kWh nameplate energy; 250 kW continuous; lithium iron phosphate.

Capacity & power

CEC Energy Storage System List

Nameplate energy (CEC)573 kWh
Rated power (CEC)250 kW
Max continuous discharge (CEC)250 kW
Full-power discharge timeabout 2.3 h at full power
ChemistryLithium Iron Phosphate
Grid connection480 V

Safety listings

CEC Energy Storage System List

UL 9540 (energy storage system)Certified by TUV Rheinland of North America
Certificate date & editionNov 16, 2022 · 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)Yes
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 Sungrow STxxxkWh-xxxkW-2h-US store?

573 kWh nameplate, per the California Energy Commission list.

Is the STxxxkWh-xxxkW-2h-US 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.