30.7 kWh

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StackRack Battery Systems SR5K-UL Battery Module

30.7 kWh · 9 kW · Lithium Ion · direct PV input · 2 configurations

UL 9540CEC listed · Feb 1, 2023

Nameplate energy30.7 kWh
Continuous power9 kW
Warranty10 years
ChemistryLithium Ion

Overview

CEC Energy Storage System List

SR5K-UL Battery Module: 30.7 kWh nameplate energy; 9 kW continuous; lithium ion; accepts solar panels directly (DC-coupled); 10 years warranty.

Models & configurations

CEC Energy Storage System List · 2 listings

Model	Energy	Power	Grid voltage	Round trip	CEC listed
SR5K-UL Battery Module / Sol-Ark 12K {208V}	30.7 kWh	9 kW	208 V	—	Mar 21, 2023
SR5K-UL Battery Module / Sol-Ark 12K {240V}	30.7 kWh	9 kW	240 V	—	Feb 1, 2023

Capacity & power

CEC Energy Storage System List

Nameplate energy (CEC)30.7 kWh
Total energy (datasheet)30.7 kWh
Rated power (CEC)9 kW
Max continuous discharge (CEC)9 kW
Full-power discharge timeabout 3.4 h at full power
ChemistryLithium Ion
Grid connection208 / 240 V
Battery voltage (DC, nominal)51.2 V
Battery voltage range (DC)48–58 V

Charging from solar in Southern California

NLR PVWatts v8 · Cali-Graf calculation · CEC Energy Storage System List

City	December	June
Los Angeles	9.6 kW	5.7 kW
Palmdale	8.8 kW	5.2 kW
Chula Vista	8.2 kW	5.9 kW
Huntington Beach	9 kW	6.2 kW
Riverside	9.2 kW	5.4 kW
Santa Clarita	9.1 kW	5.4 kW

Solar array size that refills the battery from empty in one average day, before the home uses any of it (NLR PVWatts v8, 20° south roof).

Direct PV inputYes

Inverter & compatible equipment

CEC Energy Storage System List

Direct PV inputYes
Battery modules in this systemF5507

Installation & environment

CEC Energy Storage System List · StackRack Battery Systems datasheet

Installation locationoutdoor
Ingress protectionIP55
Enclosure typeNEMA 3R
Operating temperature−25 to 55 °C
Weight per kWh1 kWh

Warranty

CEC Energy Storage System List · StackRack Battery Systems datasheet

Warranty term10 years
Rated cycle life (spec, not warranty)6,000 cycles

Safety listings

CEC Energy Storage System List

UL 9540 (energy storage system)Certified by SGS
Certificate date & editionNov 25, 2022 · Ed. 2 : 2020
Other standards on datasheetUL 1741, IEEE 1547, UL 9540

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)No
CSIP (IEEE 2030.5)No
JA12 declaration (Title 24)No
Last CEC updateMar 21, 2023
Monitor Key Data schedulingNo

Full specifications

CEC Energy Storage System List · StackRack Battery Systems datasheet

Communicationwi-fi, ethernet, rs485
Manufacturer websitestackrackbattery.com

Compare with similar batteries

CEC Energy Storage System List

Battery	Energy	Continuous power	Chemistry	Warranty	SoCal permits
EG4 Electronics PP-100A15-18K1-LL	25.6 kWh	10.4–12 kW	Lithium Iron Phosphate	10 years	—
EG4 Electronics PP-100A15-18K1-LP	25.6 kWh	10.4–12 kW	Lithium Iron Phosphate	10 years	—
EG4 Electronics PP-16/280A2-18K1-AWLL	28.6 kWh	10.4–12 kW	Lithium Iron Phosphate	10 years	—
EG4 Electronics PP-16/280A2-18K2-AWLL	28.7 kWh	20.8–24 kW	Lithium Iron Phosphate	10 years	—
EG4 Electronics PP-100A16-18K1-LP	30.7 kWh	10.4–12 kW	Lithium Iron Phosphate	10 years	—
EG4 Electronics PP-100A16-18K1-LL	30.7 kWh	10.4–12 kW	Lithium Iron Phosphate	10 years	—

Same segment, similar capacity; each row from the same sources.

Questions & answers

How much energy does the StackRack Battery Systems SR5K-UL Battery Module store?

30.7 kWh nameplate, per the California Energy Commission list.

Can the SR5K-UL Battery Module be installed outdoors?

Installation location per the datasheet: outdoor; enclosure NEMA 3R.

What warranty does the SR5K-UL Battery Module have?

10 years (datasheet).

Is the SR5K-UL Battery Module UL 9540 certified?

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

Sources

California Energy Commission — Energy Storage System List, data as of Oct 7, 2026. Manufacturer-reported values confirmed by CEC against certificates.
StackRack Battery Systems — manufacturer datasheet “SR5K-UL Battery Module Sol-Ark 12K Data Sheet The SR5K-UL Battery Module / Sol-Ark 12K is a”.
NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Riverside, Santa Clarita, Chula Vista, Huntington Beach.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).