Cali-Graf in Southern California

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7.2–9.6 kWh

Battery moduleDarfon Electronics

Darfon Electronics BxxULF-xxx

7.2–9.6 kWh · 5.7 kW · Lithium Iron Phosphate · 2 configurations

UL 1973CEC listed · Jan 21, 2020

Nameplate energy7.2–9.6 kWh
Continuous power5.7 kW
ChemistryLithium Iron Phosphate

Overview

CEC Battery List

BxxULF-xxx: 7.2–9.6 kWh nameplate energy; 5.7 kW continuous; lithium iron phosphate.

Models & configurations

CEC Battery List · 2 listings

Model	Energy	Power	Grid voltage	Round trip	CEC listed
B07ULF-xxx	7.2 kWh	—	—	—	Jan 21, 2020
B09ULF-xxx	9.6 kWh	—	—	—	Jan 21, 2020

Capacity & power

CEC Battery List

Nameplate energy (CEC)7.2–9.6 kWh
Max continuous discharge (CEC)5.7 kW
Full-power discharge timeabout 1.7 h at full power
ChemistryLithium Iron Phosphate

Charging from solar in Southern California

NLR PVWatts v8 · Cali-Graf calculation

City	December	June
Los Angeles	3 kW	1.8 kW
Palmdale	2.8 kW	1.6 kW
Chula Vista	2.6 kW	1.8 kW
Huntington Beach	2.8 kW	1.9 kW
Riverside	2.9 kW	1.7 kW
Santa Clarita	2.8 kW	1.7 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).

Safety listings

CEC Battery List

UL 1973 (stationary battery)Certified by CSA Group
Certificate date & editionDec 18, 2019 · Ed. 2 : 2018

Compare with similar batteries

CEC Energy Storage System List

Battery	Energy	Continuous power	Chemistry	Warranty	SoCal permits
SolarEdge Home Battery	9.7 kWh	5 kW	Lithium Ion	10 years	677
Schneider Electric Schneider Boost	10 kWh	8.1 kW	Lithium Iron Phosphate	10 years	—
Schneider Electric Schneider Boost	10 kWh	8.1 kW	Lithium Iron Phosphate	10 years	—
FOXESS ECS4000-H2	10.7 kWh	5.76 kW	Lithium Iron Phosphate	—	—
FOXESS ECS4000-H3	14.3 kWh	8.64 kW	Lithium Iron Phosphate	—	—
RNG International Renogy X	10 kWh	9 kW	Lithium Iron Phosphate	10 years	—

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

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.
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).