13.5 kWh

Home battery systemTesla

Tesla Powerwall +

13.5 kWh · 5 kW · Lithium Ion · direct PV input

UL 9540UL 1741 SBCEC listed · May 3, 2021Installed in 264 SoCal permits

Nameplate energy13.5 kWh
Continuous power5 kW
Round trip (AC)90%
Warranty10 years
ChemistryLithium Ion

Overview

CEC Energy Storage System List

Powerwall +: 13.5 kWh nameplate energy; 5 kW continuous; lithium ion; accepts solar panels directly (DC-coupled); 10 years warranty; named in 264 Southern California permits.

Capacity & power

CEC Energy Storage System List

Nameplate energy (CEC)13.5 kWh
Total energy (datasheet)13.5 kWh
Rated power (CEC)7.6 kW
Max continuous discharge (CEC)5 kW
Off-grid continuous power9.6 kW
Full-power discharge timeabout 2.7 h at full power
Round-trip efficiency (AC-AC)90%
Round-trip efficiency (datasheet)90%
ChemistryLithium Ion
Grid connection240 V
Phasesplit phase

Charging from solar in Southern California

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

City	December	June
Los Angeles	4.2 kW	2.5 kW
Palmdale	3.9 kW	2.3 kW
Chula Vista	3.6 kW	2.6 kW
Huntington Beach	4 kW	2.7 kW
Riverside	4 kW	2.4 kW
Santa Clarita	4 kW	2.4 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

Installation & environment

CEC Energy Storage System List · Tesla datasheet

Installation locationindoor/outdoor
Ingress protectionIP65
Enclosure typeNEMA 4X, NEMA 4
Operating temperature−20 to 50 °C
Mountingfloor
Weight per kWh1 kWh

Warranty

CEC Energy Storage System List · Tesla datasheet

Warranty term10 years

Safety listings

CEC Energy Storage System List

UL 9540 (energy storage system)Certified by TUV Rheinland of North America
Certificate date & editionApr 6, 2023 · Ed. 2 : 2020
Other standards on datasheetUL 1741, IEEE 1547, UL 1699B, UL 9540, UL 1973, UL 1642, UL 3741, UN 38.3, FCC

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)Yes
JA12 control strategiesBasic Control, Time of Use
Last CEC updateMay 1, 2026
Monitor Key Data schedulingYes

Full specifications

CEC Energy Storage System List · Tesla datasheet

Communicationwi-fi, ethernet, cellular, lte, 4g
Manufacturer websitetesla.com

Installs in Southern California

building permits

264

Permits name it

Jul 2020 – Aug 2026

Jurisdictions so far

LA County (unincorp.) (232), Anaheim (11), Los Angeles (10), Palmdale

Units per install

median of 100 permits

Permits over time

Installed together with

Tesla Solar Roof

Tesla Tesla Solar Inverter

Qcells Q.TRON

Silfab Solar SIL-xxxHC+

Top ZIP codes

ZIP 9005624
ZIP 9100122
ZIP 9174514
ZIP 9060412
ZIP 9025010
ZIP 9138410
ZIP 900439
ZIP 917488
Other ZIP codes32

Only installer and ZIP level is shown — no homeowner names, street addresses or permit numbers. Permits from LA County (unincorp.) come without a contractor license, so they count toward totals but not toward installers. Counts grow as more permit portals are loaded.

Who installs Powerwall +

building permits · CSLB License Master

Tesla Energy Operations Inc

Fremont · CSLB #888104

20 installsOct 2021 – Jun 2024Anaheim, Los Angeles

A P Electrical

Sun Valley · CSLB #974115

2 installsOct 2022 – Mar 2024Huntington Beach, Los AngelesLicense: Judgement Susp

Semper Solaris

El Cajon · CSLB #978152

2 installsAug 2023 – Mar 2024Palmdale

Solar Shoppers Construction

Palmdale · CSLB #1019939

2 installsApr 2024 – May 2024Palmdale

Option One Solar

Apple Valley · CSLB #985340

1 installMar 2023Los Angeles

Power Now Electric Inc

Carlsbad · CSLB #1098407

1 installJan 2024Anaheim

Compare with similar batteries

CEC Energy Storage System List

Battery	Energy	Continuous power	Chemistry	Warranty	SoCal permits
Tesla Powerwall 3	13.5 kWh	5–11.5 kW	Lithium Ion, Lithium Iron Phosphate	10 years	2,115
Tesla AC Powerwall	13.5 kWh	5 kW	Lithium Ion	—	394
Enphase Energy ENCHARGE-10	10.1 kWh	3.84 kW	Lithium Iron Phosphate	10 years	197
Enphase Energy IQ Battery 10C	10 kWh	7.08 kW	Lithium Iron Phosphate	—	118
Enphase Energy ENCHARGE-10T	10.1 kWh	3.84 kW	Lithium Iron Phosphate	15 years	105
Qcells Q.HOME CORE Ax.xBx.x	13.1 kWh	7.6 kW	Lithium Ion	—	13

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

Documents

manufacturer documents

PDF
Powerwall+ Datasheet
Datasheet · Jul 2026

Questions & answers

How much energy does the Tesla Powerwall + store?

13.5 kWh nameplate, per the California Energy Commission list.

Can the Powerwall + be installed outdoors?

Installation location per the datasheet: indoor/outdoor; enclosure NEMA 4X, NEMA 4.

What warranty does the Powerwall + have?

10 years (datasheet).

Is the Powerwall + UL 9540 certified?

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

Who installs the Powerwall + in Southern California?

Building permits name it 264 times. The most active licensed installers are Tesla Energy Operations Inc, A P Electrical, Semper Solaris.

Sources

California Energy Commission — Energy Storage System List, data as of Oct 7, 2026. Manufacturer-reported values confirmed by CEC against certificates.
Tesla — datasheet Powerwall+ Datasheet.
Tesla — document library on the manufacturer’s website (links above).
NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Riverside, Santa Clarita, Chula Vista, Huntington Beach.
Building permits — Southern California permit portals. Equipment matched from permit descriptions.
Contractors State License Board — License Master (contractor names and license status), as of Oct 5, 2026.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).