ENSIM Energy Technology (Zhejiang) HESS-x.x-x.xK-HV-US

Name: ENSIM Energy Technology (Zhejiang) HESS-x.x-x.xK-HV-US
Brand: ENSIM Energy Technology (Zhejiang)

7.3–21.9 kWh · 4.3–12 kW · Lithium Ion · direct PV input · 20 configurations

UL 9540UL 1741 SBCEC listed · May 1, 2024

Overview

CEC Energy Storage System List

HESS-x.x-x.xK-HV-US: 7.3–21.9 kWh nameplate energy; 4.3–12 kW continuous; lithium ion; accepts solar panels directly (DC-coupled).

CEC Energy Storage System List · 20 listings

Model	Energy	Power	Grid voltage	Round trip	CEC listed
HESS-7.3-5K-HV-US {208V}	7.3 kWh	4.33 kW	208 V	—	May 1, 2024
HESS-7.3-5K-HV-US {240V}	7.3 kWh	5 kW	240 V	—	May 1, 2024
HESS-14.6-5K-HV-US {208V}	14.6 kWh	4.33 kW	208 V	—	May 1, 2024
HESS-14.6-5K-HV-US {240V}	14.6 kWh	5 kW	240 V	—	May 1, 2024
HESS-14.6-7.6K-HV-US {208V}	14.6 kWh	6.58 kW	208 V	—	May 1, 2024
HESS-14.6-8.6K-HV-US {208V}	14.6 kWh	7.45 kW	208 V	—	May 1, 2024
HESS-14.6-7.6K-HV-US {240V}	14.6 kWh	7.6 kW	240 V	—	May 1, 2024
HESS-14.6-8.6K-HV-US {240V}	14.6 kWh	8.6 kW	240 V	—	May 1, 2024
HESS-14.6-10K-HV-US {208V}	14.6 kWh	8.66 kW	208 V	—	May 1, 2024
HESS-14.6-10K-HV-US {240V}	14.6 kWh	10 kW	240 V	—	May 1, 2024
HESS-21.9-5K-HV-US {208V}	21.9 kWh	4.33 kW	208 V	—	May 1, 2024
HESS-21.9-5K-HV-US {240V}	21.9 kWh	5 kW	240 V	—	May 1, 2024
HESS-21.9-7.6K-HV-US {208V}	21.9 kWh	6.58 kW	208 V	—	May 1, 2024
HESS-21.9-8.6K-HV-US {208V}	21.9 kWh	7.45 kW	208 V	—	May 1, 2024
HESS-21.9-7.6K-HV-US {240V}	21.9 kWh	7.6 kW	240 V	—	May 1, 2024
HESS-21.9-8.6K-HV-US {240V}	21.9 kWh	8.6 kW	240 V	—	May 1, 2024
HESS-21.9-10K-HV-US {208V}	21.9 kWh	8.66 kW	208 V	—	May 1, 2024
HESS-21.9-10K-HV-US {240V}	21.9 kWh	10 kW	240 V	—	May 1, 2024
HESS-21.9-12K-HV-US {208V}	21.9 kWh	10.4 kW	208 V	—	May 1, 2024
HESS-21.9-12K-HV-US {240V}	21.9 kWh	12 kW	240 V	—	May 1, 2024

CEC Energy Storage System List

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

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).

CEC Energy Storage System List

UL 9540 certifies the whole storage system; UL 9540A is the fire-propagation test that fire codes ask for indoors and near walls.

CEC Energy Storage System List

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
Lunar Energy LE-ESS-xxKWH	15–20 kWh	9.6 kW	Lithium Ion	—	3
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-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.

How much energy does the ENSIM Energy Technology (Zhejiang) HESS-x.x-x.xK-HV-US store?

7.3–21.9 kWh nameplate, per the California Energy Commission list.

Is the HESS-x.x-x.xK-HV-US UL 9540 certified?

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

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).