15–20 kWh

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Lunar Energy LE-ESS-xxKWH

15–20 kWh · 9.6 kW · Lithium Ion · direct PV input · 2 configurations

UL 9540UL 1741 SBCEC listed · Nov 21, 2024Installed in 3 SoCal permits

Nameplate energy15–20 kWh
Continuous power9.6 kW
Round trip (AC)81%
ChemistryLithium Ion

Overview

CEC Energy Storage System List

LE-ESS-xxKWH: 15–20 kWh nameplate energy; 9.6 kW continuous; lithium ion; accepts solar panels directly (DC-coupled); named in 3 Southern California permits.

Models & configurations

CEC Energy Storage System List · 2 listings

Model	Energy	Power	Grid voltage	Round trip	CEC listed
LE-ESS-15KWH	15 kWh	9.6 kW	240 V	81%	Jun 2, 2025
LE-ESS-20KWH	20 kWh	9.6 kW	240 V	81%	Nov 21, 2024

Capacity & power

CEC Energy Storage System List

Nameplate energy (CEC)15–20 kWh
Rated power (CEC)9.6 kW
Max continuous discharge (CEC)9.6 kW
Full-power discharge timeabout 2.1 h at full power
Round-trip efficiency (AC-AC)81%
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	6.2 kW	3.7 kW
Palmdale	5.7 kW	3.4 kW
Chula Vista	5.3 kW	3.8 kW
Huntington Beach	5.9 kW	4.1 kW
Riverside	6 kW	3.5 kW
Santa Clarita	5.9 kW	3.5 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

Safety listings

CEC Energy Storage System List

UL 9540 (energy storage system)Certified by CSA Group
Certificate date & editionApr 14, 2025 · Ed. 3 : 2023

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)No
CSIP (IEEE 2030.5)Yes (with conditions)
JA12 declaration (Title 24)Yes
JA12 control strategiesBasic, TOU
Last CEC updateDec 11, 2025
Monitor Key Data schedulingNo

Installs in Southern California

building permits

Permits name it

Jun 2025 – Oct 2025

Jurisdictions so far

LA County (unincorp.) (3)

Units per install

median of 3 permits

Permits over time

Installed together with

Elin Energy (Sirius PV) ELNSM54M-HC

Lunar Energy (model not specified)

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
Generac PWRcell	8.6–17.1 kWh	3.4–6.7 kW	Lithium Ion	—	8
Panasonic EVHB-I7-Xxx	9–18 kWh	7.6 kW	Lithium Iron	12 years	2
sonnen SCORE-Pxx	10–20 kWh	4.8 kW	Lithium Iron Phosphate	10 years	2
Qcells Q.HOME+ ESS HYB-G1	13.5 kWh	6–8.6 kW	Lithium Ion	10 years	1
EG4 Electronics PP-16/280A1-18K1-AWLL	14.3 kWh	8.7–10 kW	Lithium Iron Phosphate	10 years	—
EG4 Electronics PP-100A14-18K1-LP	20.5 kWh	10.4–12 kW	Lithium Iron Phosphate	10 years	—

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

Questions & answers

How much energy does the Lunar Energy LE-ESS-xxKWH store?

15–20 kWh nameplate, per the California Energy Commission list.

Is the LE-ESS-xxKWH UL 9540 certified?

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

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).