13.5 kWh

Home battery systemTesla

Tesla AC Powerwall

13.5 kWh · 5 kW · Lithium Ion · 3 configurations

UL 9540CEC listed · Jul 13, 2020Installed in 394 SoCal permits

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

Overview

CEC Energy Storage System List

AC Powerwall: 13.5 kWh nameplate energy; 5 kW continuous; lithium ion; named in 394 Southern California permits.

Capacity & power

CEC Energy Storage System List

Nameplate energy (CEC)13.5 kWh
Rated power (CEC)5 kW
Max continuous discharge (CEC)5 kW
Full-power discharge timeabout 2.7 h at full power
Round-trip efficiency (AC-AC)90%
ChemistryLithium Ion
Grid connection240 V

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 inputNo

Safety listings

CEC Energy Storage System List

UL 9540 (energy storage system)Certified by Intertek
Certificate date & editionJul 17, 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)Yes (with conditions)
JA12 declaration (Title 24)No
JA12 control strategiesBasic Control, Time of Use
Last CEC updateJun 22, 2026
Monitor Key Data schedulingYes

Installs in Southern California

building permits

394

Permits name it

Feb 2018 – Jul 2026

Jurisdictions so far

LA County (unincorp.) (339), Los Angeles (40), Palmdale (10), Huntingt

Units per install

median of 334 permits

Permits over time

Installed together with

Enphase IQ8M

Qcells Q.PEAK DUO

SolarEdge SE…H (HD-Wave)

Enphase IQ8A

REC Alpha Pure

REC Alpha

Top ZIP codes

ZIP 9351033
ZIP 9029028
ZIP 9026525
ZIP 9139024
ZIP 9100116
ZIP 9138115
ZIP 9174612
ZIP 9174511
Other ZIP codes39

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

Who installs AC Powerwall

building permits · CSLB License Master

Semper Solaris

El Cajon · CSLB #978152

9 installsJun 2020 – May 2025Los Angeles, Huntington Beach

Tesla Energy Operations Inc

Fremont · CSLB #888104

9 installsMay 2019 – Jul 2020Los Angeles

A P Electrical

Sun Valley · CSLB #974115

5 installsApr 2020 – Apr 2024Los Angeles, PalmdaleLicense: Judgement Susp

Bright Ops

Worcester · CSLB #1020761

5 installsSep 2023 – Sep 2024Palmdale

Green Convergence

Valencia · CSLB #927678

4 installsJun 2020 – Dec 2021Los Angeles

Sea Bright Solar Inc

San Bernardino · CSLB #900399

2 installsNov 2019Los Angeles

Solar Optimum Design & Electrical

Glendale · CSLB #972228

2 installsJul 2019 – Apr 2022Anaheim, Los Angeles

Solar Shoppers Construction

Palmdale · CSLB #1019939

2 installsApr 2024 – Aug 2024Palmdale

Sunlux

Corona · CSLB #1008374

2 installsNov 2022 – Aug 2023Los Angeles, Palmdale

Infinity Solar

Orange · CSLB #824287

1 installMay 2020Los Angeles

Los Angeles Solar Pros

Los Angeles · CSLB #1033488

1 installJun 2020Los Angeles

Plug It In Solar

Van Nuys · CSLB #986882

1 installJul 2022Los Angeles

Powur Home Construction

Albuquerque · CSLB #1060243

1 installJul 2026Chula Vista

Treepublic Solar

Hawthorne · CSLB #996593

1 installJun 2020Los Angeles

Urban Energy Solar Inc

Huntington Beach · CSLB #944115

1 installMar 2024Huntington Beach

and 1 more licensed installers

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 Powerwall +	13.5 kWh	5 kW	Lithium Ion	10 years	264
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.

Questions & answers

How much energy does the Tesla AC Powerwall store?

13.5 kWh nameplate, per the California Energy Commission list.

Is the AC Powerwall UL 9540 certified?

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

Who installs the AC Powerwall in Southern California?

Building permits name it 394 times. The most active licensed installers are Semper Solaris, Tesla Energy Operations Inc, A P Electrical.

Sources

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