Cali-Graf in Southern California

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9–18 kWh

Battery modulePanasonic

Panasonic EV-Xxx

10–20 kWh · 5.5–11.1 kW · Lithium Iron Phosphate · 3 configurations

UL 1973CEC listed · Oct 23, 2023

Usable energy9–18 kWh
Continuous power5.5–11.1 kW
Warranty12 years
ChemistryLithium Iron Phosphate

Overview

CEC Battery List

EV-Xxx: 9–18 kWh usable energy; 5.5–11.1 kW continuous; lithium iron phosphate; 12 years warranty.

Models & configurations

CEC Battery List · 3 listings

Model	Energy	Power	Grid voltage	Round trip	CEC listed
EV-X10	10 kWh	—	—	—	Oct 23, 2023
EV-X15	15 kWh	—	—	—	Oct 23, 2023
EV-X20	20 kWh	—	—	—	Oct 23, 2023

Capacity & power

CEC Battery List

Nameplate energy (CEC)10–20 kWh
Total energy (datasheet)10–20 kWh
Usable energy9–18 kWh
Depth of discharge90%
Max continuous discharge (CEC)5.5–11.1 kW
Continuous power (datasheet)7.6 kW
Peak power6.2 kW 10 s · 9.2 kW 10 s
Full-power discharge timeabout 1.2 h at full power
ChemistryLithium Iron Phosphate
Battery voltage range (DC)75–450 V

How long can it power your home?

Cali-Graf calculation · CEC Battery List

Average home load	Runtime from full
0.5 kW	≈ 18 h
1 kW	≈ 9 h
2 kW	≈ 4.5 h
3 kW	≈ 3 h
7.6 kW (full continuous power)	≈ 1.2 h

Runtime = 9 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.

Whole-home backupWhole-home backup

Charging from solar in Southern California

NLR PVWatts v8 · Cali-Graf calculation

City	December	June
Los Angeles	2.8 kW	1.7 kW
Palmdale	2.6 kW	1.5 kW
Chula Vista	2.4 kW	1.7 kW
Huntington Beach	2.6 kW	1.8 kW
Riverside	2.7 kW	1.6 kW
Santa Clarita	2.7 kW	1.6 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).

Installation & environment

CEC Battery List · Panasonic datasheet

Installation locationindoor/outdoor
Enclosure typeNEMA 4X, NEMA 3R
Operating temperature−25 to 60 °C

Warranty

CEC Battery List · Panasonic datasheet

Warranty term12 years
Rated cycle life (spec, not warranty)6,000 cycles

Safety listings

CEC Battery List

UL 1973 (stationary battery)Certified by CSA Group
Certificate date & editionMar 17, 2023 · Ed. 2 : 2018
UL 9540A (fire propagation test)Yes
Other standards on datasheetUL 1741, IEEE 1547, UL 1699B, UL 9540A, UL 9540, UL 1973, 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.

Full specifications

CEC Battery List · Panasonic datasheet

Communicationrs485, can, wifi, wi-fi
Manufacturer websitepanasonic.com

Compare with similar batteries

CEC Energy Storage System List

Battery	Energy	Continuous power	Chemistry	Warranty	SoCal permits
LG Energy Solution RESU 10H Prime	9.6–16 kWh	5 kW	Lithium Ion	—	127
Qcells Q.SAVE	9–18 kWh	5.5–11.1 kW	Lithium Iron	10 years	30
EG4 Electronics WP-16/280-1AWLL	14.3 kWh	10.2 kW	Lithium Iron Phosphate	10 years	5
Tigo Energy TSB	9 kWh	3.5–5.2 kW	Lithium Iron Phosphate	11 years	2
FOXESS ECS4000-H5	25 kWh	14.4 kW	Lithium Iron Phosphate	—	1
RNG International Renogy X	20 kWh	10 kW	Lithium Iron Phosphate	10 years	1

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

Questions & answers

How much energy does the Panasonic EV-Xxx store?

9–18 kWh usable, per the manufacturer datasheet.

How long can the EV-Xxx power a home?

About 9 hours at an average 1 kW load from a full charge (9 kWh usable); higher loads shorten it.

Can the EV-Xxx be installed outdoors?

Installation location per the datasheet: indoor/outdoor; enclosure NEMA 4X, NEMA 3R.

What warranty does the EV-Xxx have?

12 years (datasheet).

Sources

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