BYD Fronius-Primo-GEN24-208-240-Plus-xx.x-ESS-HVM-us

11–19.3 kWh · 3.8–10 kW · Lithium Iron Phosphate · direct PV input · 40 configurations

UL 9540UL 1741 SBCEC listed · Feb 11, 2025

Nameplate energy11–19.3 kWh
Continuous power3.8–10 kW
ChemistryLithium Iron Phosphate

Overview

CEC Energy Storage System List

Fronius-Primo-GEN24-208-240-Plus-xx.x-ESS-HVM-us: 11–19.3 kWh nameplate energy; 3.8–10 kW continuous; lithium iron phosphate; accepts solar panels directly (DC-coupled).

Models & configurations

CEC Energy Storage System List · 40 listings

Model	Energy	Power	Grid voltage	Round trip	CEC listed
Fronius-Primo-GEN24-208-240-Plus-3.8-ESS-HVM-us {208V, 11kWh}	11 kWh	3.8 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-3.8-ESS-HVM-us {240V, 11kWh}	11 kWh	3.8 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-5.0-ESS-HVM-us {208V, 11kWh}	11 kWh	5 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-5.0-ESS-HVM-us {240V, 11kWh}	11 kWh	5 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-6.0-ESS-HVM-us {208V, 11kWh}	11 kWh	6 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-6.0-ESS-HVM-us {240V, 11kWh}	11 kWh	6 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-7.7-ESS-HVM-us {208V, 11kWh}	11 kWh	7.7 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-7.7-ESS-HVM-us {240V, 11kWh}	11 kWh	7.7 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-10.0-ESS-HVM-us {208V, 11kWh}	11 kWh	10 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-10.0-ESS-HVM-us {240V, 11kWh}	11 kWh	10 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-3.8-ESS-HVM-us {208V, 13.8kWh}	13.8 kWh	3.8 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-3.8-ESS-HVM-us {240V, 13.8kWh}	13.8 kWh	3.8 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-5.0-ESS-HVM-us {208V, 13.8kWh}	13.8 kWh	5 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-5.0-ESS-HVM-us {240V, 13.8kWh}	13.8 kWh	5 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-6.0-ESS-HVM-us {208V, 13.8kWh}	13.8 kWh	6 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-6.0-ESS-HVM-us {240V, 13.8kWh}	13.8 kWh	6 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-7.7-ESS-HVM-us {208V, 13.8kWh}	13.8 kWh	7.7 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-7.7-ESS-HVM-us {240V, 13.8kWh}	13.8 kWh	7.7 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-10.0-ESS-HVM-us {208V, 13.8kWh}	13.8 kWh	10 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-10.0-ESS-HVM-us {240V, 13.8kWh}	13.8 kWh	10 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-3.8-ESS-HVM-us {208V, 16.6kWh}	16.6 kWh	3.8 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-3.8-ESS-HVM-us {240V, 16.6kWh}	16.6 kWh	3.8 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-5.0-ESS-HVM-us {208V, 16.6kWh}	16.6 kWh	5 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-5.0-ESS-HVM-us {240V, 16.6kWh}	16.6 kWh	5 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-6.0-ESS-HVM-us {208V, 16.6kWh}	16.6 kWh	6 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-6.0-ESS-HVM-us {240V, 16.6kWh}	16.6 kWh	6 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-7.7-ESS-HVM-us {208V, 16.6kWh}	16.6 kWh	7.7 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-7.7-ESS-HVM-us {240V, 16.6kWh}	16.6 kWh	7.7 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-10.0-ESS-HVM-us {208V, 16.6kWh}	16.6 kWh	10 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-10.0-ESS-HVM-us {240V, 16.6kWh}	16.6 kWh	10 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-3.8-ESS-HVM-us {208V, 19.3kWh}	19.3 kWh	3.8 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-3.8-ESS-HVM-us {240V, 19.3kWh}	19.3 kWh	3.8 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-5.0-ESS-HVM-us {208V, 19.3kWh}	19.3 kWh	5 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-5.0-ESS-HVM-us {240V, 19.3kWh}	19.3 kWh	5 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-6.0-ESS-HVM-us {208V, 19.3kWh}	19.3 kWh	6 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-6.0-ESS-HVM-us {240V, 19.3kWh}	19.3 kWh	6 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-7.7-ESS-HVM-us {208V, 19.3kWh}	19.3 kWh	7.7 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-7.7-ESS-HVM-us {240V, 19.3kWh}	19.3 kWh	7.7 kW	240 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-10.0-ESS-HVM-us {208V, 19.3kWh}	19.3 kWh	10 kW	208 V	—	Feb 11, 2025
Fronius-Primo-GEN24-208-240-Plus-10.0-ESS-HVM-us {240V, 19.3kWh}	19.3 kWh	10 kW	240 V	—	Feb 11, 2025

Capacity & power

CEC Energy Storage System List

Nameplate energy (CEC)11–19.3 kWh
Rated power (CEC)3.8–10 kW
Max continuous discharge (CEC)3.8–10 kW
Full-power discharge timeabout 1.9 h at full power
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	6 kW	3.6 kW
Palmdale	5.5 kW	3.2 kW
Chula Vista	5.1 kW	3.7 kW
Huntington Beach	5.7 kW	3.9 kW
Riverside	5.8 kW	3.4 kW
Santa Clarita	5.7 kW	3.4 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 of North America
Certificate date & editionDec 11, 2024 · 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)Yes
CSIP (IEEE 2030.5)Yes (with conditions)
JA12 declaration (Title 24)No
Monitor Key Data schedulingYes

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
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-16/280A1-18K1-AWLL	14.3 kWh	8.7–10 kW	Lithium Iron Phosphate	10 years	—

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

Questions & answers

How much energy does the BYD Fronius-Primo-GEN24-208-240-Plus-xx.x-ESS-HVM-us store?

11–19.3 kWh nameplate, per the California Energy Commission list.

Is the Fronius-Primo-GEN24-208-240-Plus-xx.x-ESS-HVM-us UL 9540 certified?

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

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).