5.8 kWh

Home battery systemVillara Energy Systems

Villara Energy Systems VillaGrid

5.8 kWh · 8 kW · Lithium Titanate Oxide

UL 9540CEC listed · Oct 1, 2021

Usable energy5.8 kWh
Continuous power8 kW
Round trip (AC)92.4%
Warranty20 years
ChemistryLithium Titanate Oxide

Overview

CEC Energy Storage System List

VillaGrid: 5.8 kWh usable energy; 8 kW continuous; lithium titanate oxide; 20 years warranty.

Capacity & power

CEC Energy Storage System List

Nameplate energy (CEC)5.8 kWh
Usable energy5.8 kWh
Rated power (CEC)8 kW
Max continuous discharge (CEC)8 kW
Peak power16 kW 10 s · 30 kW 10 s
Full-power discharge timeabout 0.7 h at full power
Round-trip efficiency (AC-AC)92.4%
Round-trip efficiency (datasheet)92.4% · 99.2% · 98.5%
ChemistryLithium Titanate Oxide
Grid connection240 V
Battery voltage (DC, nominal)53 V

How long can it power your home?

Cali-Graf calculation

Average home load	Runtime from full
0.5 kW	≈ 11.5 h
1 kW	≈ 5.8 h
2 kW	≈ 2.9 h
3 kW	≈ 1.9 h
8 kW (full continuous power)	≈ 0.7 h

Runtime = 5.8 kWh usable (datasheet) ÷ load. A typical home averages 1–2 kW; air conditioning and EV charging use much more. Inverter and wiring losses shorten it.

Charging from solar in Southern California

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

City	December	June
Los Angeles	1.8 kW	1.1 kW
Palmdale	1.7 kW	1 kW
Chula Vista	1.5 kW	1.1 kW
Huntington Beach	1.7 kW	1.2 kW
Riverside	1.7 kW	1 kW
Santa Clarita	1.7 kW	1 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

Installation & environment

CEC Energy Storage System List · Villara Energy Systems datasheet

Installation locationindoor
Operating temperature−30 to 55 °C
Weight per kWh1 kWh

Warranty

CEC Energy Storage System List · Villara Energy Systems datasheet

Warranty term20 years

Safety listings

CEC Energy Storage System List

UL 9540 (energy storage system)Certified by Intertek
Certificate date & editionJan 29, 2021 · Ed. 1 : 2016
Other standards on datasheetUL 9540, UL 1973, UL 1642

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)Yes
JA12 control strategiesBasic, TOU, Advanced Control
Last CEC updateOct 11, 2021
Monitor Key Data schedulingNo

Full specifications

CEC Energy Storage System List · Villara Energy Systems datasheet

Communicationcan
Manufacturer websitevillaraenergy.com

Compare with similar batteries

CEC Energy Storage System List

Battery	Energy	Continuous power	Chemistry	Warranty	SoCal permits
Enphase Energy IQ Battery 5P	5 kWh	3.33–3.84 kW	Lithium Iron Phosphate	15 years	788
Fortress Power eFlex	5.4 kWh	5 kW	Lithium Iron Phosphate	—	—
Villara Energy Systems VillaGrid	5.8 kWh	8 kW	Lithium Titanate Oxide	20 years	—
Shanghai PYTES Energy E-BOX-48100R	5.1 kWh	2.56 kW	Lithium Ion	10 years	1
APsystems (Altenergy Power System) APbattery	5.2 kWh	5 kW	Lithium Iron Phosphate	—	—
MANGO POWER TECH M Battery xkWh	5 kWh	5.12 kW	Lithium Ion	10 years	—

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

Questions & answers

How much energy does the Villara Energy Systems VillaGrid store?

5.8 kWh usable, per the manufacturer datasheet.

How long can the VillaGrid power a home?

About 5.8 hours at an average 1 kW load from a full charge (5.8 kWh usable); higher loads shorten it.

Can the VillaGrid be installed outdoors?

Installation location per the datasheet: indoor.

What warranty does the VillaGrid have?

20 years (datasheet).

Is the VillaGrid 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.
Villara Energy Systems — manufacturer datasheet “for an increasingly unreliable electric power grid.”.
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).