8.6–17.1 kWh

Home battery systemGenerac

Generac PWRcell

8.6–17.1 kWh · 3.4–6.7 kW · Lithium Ion · 4 configurations

UL 9540CEC listed · Apr 21, 2020Installed in 8 SoCal permits

Nameplate energy8.6–17.1 kWh
Continuous power3.4–6.7 kW
ChemistryLithium Ion

Overview

CEC Energy Storage System List

PWRcell: 8.6–17.1 kWh nameplate energy; 3.4–6.7 kW continuous; lithium ion; named in 8 Southern California permits.

Models & configurations

CEC Energy Storage System List · 4 listings

Model	Energy	Power	Grid voltage	Round trip	CEC listed
PWRcell 9	8.6 kWh	5 kW	—	—	Apr 21, 2020
PWRcell 12	11.4 kWh	6.7 kW	—	—	Apr 21, 2020
PWRcell 15	14.3 kWh	8.4 kW	—	—	Apr 21, 2020
PWRcell 17	17.1 kWh	10 kW	—	—	Apr 21, 2020

Capacity & power

CEC Energy Storage System List

Nameplate energy (CEC)8.6–17.1 kWh
Rated power (CEC)5–10 kW
Max continuous discharge (CEC)3.4–6.7 kW
Full-power discharge timeabout 2.6 h at full power
ChemistryLithium Ion

Charging from solar in Southern California

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

City	December	June
Los Angeles	5.3 kW	3.1 kW
Palmdale	4.9 kW	2.9 kW
Chula Vista	4.6 kW	3.3 kW
Huntington Beach	5 kW	3.5 kW
Riverside	5.1 kW	3 kW
Santa Clarita	5 kW	3 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

Inverter & compatible equipment

CEC Energy Storage System List

Direct PV inputNo
Listed with invertersX11402, X7602, XVT076A03, XVT114G03

Safety listings

CEC Energy Storage System List

UL 9540 (energy storage system)Certified by Intertek
Certificate date & editionOct 29, 2019 · 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)No
CSIP (IEEE 2030.5)No
JA12 declaration (Title 24)No
Last CEC updateAug 11, 2022
Monitor Key Data schedulingNo

Installs in Southern California

building permits

Permits name it

Jun 2020 – Jan 2025

Jurisdictions so far

LA County (unincorp.) (8)

Units per install

median of 3 permits

Permits over time

Installed together with

Generac (model not specified)

Qcells Q.PEAK DUO

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.

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
Tesla Powerwall +	13.5 kWh	5 kW	Lithium Ion	10 years	264
Qcells Q.HOME CORE Ax.xBx.x	13.1 kWh	7.6 kW	Lithium Ion	—	13
Qcells Q.HOME CORE Ax.xBx.x US.1	13.1 kWh	7.84 kW	Lithium Ion	—	4
Lunar Energy LE-ESS-xxKWH	15–20 kWh	9.6 kW	Lithium Ion	—	3

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

Documents

Questions & answers

How much energy does the Generac PWRcell store?

8.6–17.1 kWh nameplate, per the California Energy Commission list.

Is the PWRcell UL 9540 certified?

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

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.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).