Eternalplanet Energy ETERNAL PANET

5–40 kWh · 5–11.5 kW · Lithium Iron Phosphate · direct PV input · 56 configurations

UL 9540UL 1741 SBCEC listed · Nov 12, 2025

Nameplate energy5–40 kWh
Continuous power5–11.5 kW
Round trip (AC)81.9–89.1%
ChemistryLithium Iron Phosphate

Overview

CEC Energy Storage System List

ETERNAL PANET: 5–40 kWh nameplate energy; 5–11.5 kW continuous; lithium iron phosphate; accepts solar panels directly (DC-coupled).

Models & configurations

CEC Energy Storage System List · 56 listings

Model	Energy	Power	Grid voltage	Round trip	CEC listed
EP Cube2 UL-S-5G {208V, 5kW}	5 kWh	5 kW	208 V	82%	Jul 21, 2026
EP Cube2 UL-S-5G {240V, 5.8kW}	5 kWh	5.8 kW	240 V	82%	Jul 21, 2026
EP Cube2 UL-S-5G {208V, 6.6kW}	5 kWh	6.6 kW	208 V	82%	Jul 21, 2026
EP Cube2 UL-S-5G {240V, 7.6kW}	5 kWh	7.6 kW	240 V	82%	Jul 21, 2026
EP Cube2 UL-S-5G {240V, 9.6kW}	5 kWh	9.6 kW	240 V	82%	Jul 21, 2026
EP Cube2 UL-S-5G {208V, 9.9kW}	5 kWh	9.9 kW	208 V	82%	Jul 21, 2026
EP Cube2 UL-S-5G	5 kWh	11.5 kW	240 V	82%	Nov 12, 2025
EP Cube2 UL-S-10G {208V, 5kW}	10 kWh	5 kW	208 V	82%	Jul 21, 2026
EP Cube2 UL-S-10G {240V, 5.8kW}	10 kWh	5.8 kW	240 V	82%	Jul 21, 2026
EP Cube2 UL-S-10G {208V, 6.6kW}	10 kWh	6.6 kW	208 V	82%	Jul 21, 2026
EP Cube2 UL-S-10G {240V, 7.6kW}	10 kWh	7.6 kW	240 V	82%	Jul 21, 2026
EP Cube2 UL-S-10G {240V, 9.6kW}	10 kWh	9.6 kW	240 V	82%	Jul 21, 2026
EP Cube2 UL-S-10G {208V, 9.9kW}	10 kWh	9.9 kW	208 V	82%	Jul 21, 2026
EP Cube2 UL-S-10G	10 kWh	11.5 kW	240 V	82%	Nov 12, 2025
EP Cube2 UL-S-15G {208V, 5kW}	15 kWh	5 kW	208 V	84%	Jul 21, 2026
EP Cube2 UL-S-15G {240V, 5.8kW}	15 kWh	5.8 kW	240 V	84%	Jul 21, 2026
EP Cube2 UL-S-15G {208V, 6.6kW}	15 kWh	6.6 kW	208 V	84%	Jul 21, 2026
EP Cube2 UL-S-15G {240V, 7.6kW}	15 kWh	7.6 kW	240 V	84%	Jul 21, 2026
EP Cube2 UL-S-15G {240V, 9.6kW}	15 kWh	9.6 kW	240 V	84%	Jul 21, 2026
EP Cube2 UL-S-15G {208V, 9.9kW}	15 kWh	9.9 kW	208 V	84%	Jul 21, 2026
EP Cube2 UL-S-15G	15 kWh	11.5 kW	240 V	84%	Nov 12, 2025
EP Cube2 UL-S-20G {208V, 5kW}	20 kWh	5 kW	208 V	85%	Jul 21, 2026
EP Cube2 UL-S-20G {240V, 5.8kW}	20 kWh	5.8 kW	240 V	85%	Jul 21, 2026
EP Cube2 UL-S-20G {208V, 6.6kW}	20 kWh	6.6 kW	208 V	85%	Jul 21, 2026
EP Cube2 UL-S-20G {240V, 7.6kW}	20 kWh	7.6 kW	240 V	85%	Jul 21, 2026
EP Cube2 UL-S-20G {240V, 9.6kW}	20 kWh	9.6 kW	240 V	85%	Jul 21, 2026
EP Cube2 UL-S-20G {208V, 9.9kW}	20 kWh	9.9 kW	208 V	85%	Jul 21, 2026
EP Cube2 UL-S-20G	20 kWh	11.5 kW	240 V	85%	Nov 12, 2025
EP Cube2 UL-S-25G {208V, 5kW}	25 kWh	5 kW	208 V	86%	Jul 21, 2026
EP Cube2 UL-S-25G {240V, 5.8kW}	25 kWh	5.8 kW	240 V	86%	Jul 21, 2026
EP Cube2 UL-S-25G {208V, 6.6kW}	25 kWh	6.6 kW	208 V	86%	Jul 21, 2026
EP Cube2 UL-S-25G {240V, 7.6kW}	25 kWh	7.6 kW	240 V	86%	Jul 21, 2026
EP Cube2 UL-S-25G {240V, 9.6kW}	25 kWh	9.6 kW	240 V	86%	Jul 21, 2026
EP Cube2 UL-S-25G {208V, 9.9kW}	25 kWh	9.9 kW	208 V	86%	Jul 21, 2026
EP Cube2 UL-S-25G	25 kWh	11.5 kW	240 V	86%	Nov 12, 2025
EP Cube2 UL-S-30G {208V, 5kW}	30 kWh	5 kW	208 V	88%	Jul 21, 2026
EP Cube2 UL-S-30G {240V, 5.8kW}	30 kWh	5.8 kW	240 V	88%	Jul 21, 2026
EP Cube2 UL-S-30G {208V, 6.6kW}	30 kWh	6.6 kW	208 V	88%	Jul 21, 2026
EP Cube2 UL-S-30G {240V, 7.6kW}	30 kWh	7.6 kW	240 V	88%	Jul 21, 2026
EP Cube2 UL-S-30G {240V, 9.6kW}	30 kWh	9.6 kW	240 V	88%	Jul 21, 2026
EP Cube2 UL-S-30G {208V, 9.9kW}	30 kWh	9.9 kW	208 V	88%	Jul 21, 2026
EP Cube2 UL-S-30G	30 kWh	11.5 kW	240 V	88%	Nov 12, 2025
EP Cube2 UL-S-35G {208V, 5kW}	35 kWh	5 kW	208 V	89%	Jul 21, 2026
EP Cube2 UL-S-35G {240V, 5.8kW}	35 kWh	5.8 kW	240 V	89%	Jul 21, 2026
EP Cube2 UL-S-35G {208V, 6.6kW}	35 kWh	6.6 kW	208 V	89%	Jul 21, 2026
EP Cube2 UL-S-35G {240V, 7.6kW}	35 kWh	7.6 kW	240 V	89%	Jul 21, 2026
EP Cube2 UL-S-35G {240V, 9.6kW}	35 kWh	9.6 kW	240 V	89%	Jul 21, 2026
EP Cube2 UL-S-35G {208V, 9.9kW}	35 kWh	9.9 kW	208 V	89%	Jul 21, 2026
EP Cube2 UL-S-35G	35 kWh	11.5 kW	240 V	89%	Nov 12, 2025
EP Cube2 UL-S-40G {208V, 5kW}	40 kWh	5 kW	208 V	89%	Jul 21, 2026
EP Cube2 UL-S-40G {240V, 5.8kW}	40 kWh	5.8 kW	240 V	89%	Jul 21, 2026
EP Cube2 UL-S-40G {208V, 6.6kW}	40 kWh	6.6 kW	208 V	89%	Jul 21, 2026
EP Cube2 UL-S-40G {240V, 7.6kW}	40 kWh	7.6 kW	240 V	89%	Jul 21, 2026
EP Cube2 UL-S-40G {240V, 9.6kW}	40 kWh	9.6 kW	240 V	89%	Jul 21, 2026
EP Cube2 UL-S-40G {208V, 9.9kW}	40 kWh	9.9 kW	208 V	89%	Jul 21, 2026
EP Cube2 UL-S-40G	40 kWh	11.5 kW	240 V	89%	Nov 12, 2025

Capacity & power

CEC Energy Storage System List

Nameplate energy (CEC)5–40 kWh
Rated power (CEC)5–11.5 kW
Max continuous discharge (CEC)5–11.5 kW
Full-power discharge timeabout 3.4 h at full power
Round-trip efficiency (AC-AC)81.9–89.1%
ChemistryLithium Iron Phosphate
Grid connection208 / 240 V

Charging from solar in Southern California

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

City	December	June
Los Angeles	12.4 kW	7.4 kW
Palmdale	11.5 kW	6.7 kW
Chula Vista	10.6 kW	7.6 kW
Huntington Beach	11.7 kW	8.1 kW
Riverside	11.9 kW	7.1 kW
Santa Clarita	11.8 kW	7 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 TUV Rheinland
Certificate date & editionSep 30, 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)
Anti-islanding method groupsGroup 1 Anti-Island8
JA12 declaration (Title 24)Yes
JA12 control strategiesBasic, TOU
CEC noteMax discharge power of the battery component is 3 kW
Last CEC updateOct 1, 2026

Compare with similar batteries

CEC Energy Storage System List

Battery	Energy	Continuous power	Chemistry	Warranty	SoCal permits
EG4 Electronics PP-16/280A2-18K1-AWLL	28.6 kWh	10.4–12 kW	Lithium Iron Phosphate	10 years	—
EG4 Electronics PP-16/280A2-18K2-AWLL	28.7 kWh	20.8–24 kW	Lithium Iron Phosphate	10 years	—
EG4 Electronics PP-100A16-18K1-LP	30.7 kWh	10.4–12 kW	Lithium Iron Phosphate	10 years	—
EG4 Electronics PP-100A16-18K1-LL	30.7 kWh	10.4–12 kW	Lithium Iron Phosphate	10 years	—
EG4 Electronics PP-16/280A3-18K1-AWLL	43 kWh	10.4–12 kW	Lithium Iron Phosphate	10 years	—
EG4 Electronics PP-16/280A3-18K2-AWLL	43 kWh	20.8–24 kW	Lithium Iron Phosphate	10 years	—

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

Questions & answers

How much energy does the Eternalplanet Energy ETERNAL PANET store?

5–40 kWh nameplate, per the California Energy Commission list.

Is the ETERNAL PANET UL 9540 certified?

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

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