FranklinWH aPower Xyyy

Name: FranklinWH aPower Xyyy
Brand: FranklinWH

15 kWh · 5–11.5 kW · Lithium Iron Phosphate · 10 configurations

UL 9540UL 1741 SBCEC listed · Nov 21, 2024

Overview

CEC Energy Storage System List

aPower Xyyy: 15 kWh nameplate energy; 5–11.5 kW continuous; lithium iron phosphate.

CEC Energy Storage System List · 10 listings

Model	Energy	Power	Grid voltage	Round trip	CEC listed
aPower Xyyy {208V, 5 kW}	15 kWh	5 kW	208 V	90%	Oct 13, 2025
aPower Xyyy {240V, 5 kW}	15 kWh	5 kW	240 V	90%	Oct 13, 2025
aPower Xyyy {208V, 7.6 kW}	15 kWh	7.6 kW	208 V	90%	Oct 13, 2025
aPower Xyyy {240V, 7.6 kW}	15 kWh	7.6 kW	240 V	90%	Oct 13, 2025
aPower Xyyy {208V, 9.6 kW}	15 kWh	9.6 kW	208 V	90%	Oct 13, 2025
aPower Xyyy {240V, 9.6 kW}	15 kWh	9.6 kW	240 V	90%	Oct 13, 2025
aPower Xyyy {208V, 10kW}	15 kWh	10 kW	208 V	90%	Nov 21, 2024
aPower Xyyy {240V, 10kW}	15 kWh	10 kW	240 V	90%	Nov 21, 2024
aPower Xyyy {208V, 11.5 kW}	15 kWh	11.5 kW	208 V	90%	Dec 22, 2025
aPower Xyyy {240V, 11.5 kW}	15 kWh	11.5 kW	240 V	90%	Dec 22, 2025

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
Tesla Powerwall 3	13.5 kWh	5–11.5 kW	Lithium Ion, Lithium Iron Phosphate	10 years	2,115
Tesla AC Powerwall	13.5 kWh	5 kW	Lithium Ion	—	394
Tesla Powerwall +	13.5 kWh	5 kW	Lithium Ion	10 years	264
Qcells Q.HOME CORE Ax.xBx.x	13.1 kWh	7.6 kW	Lithium Ion	—	13
Generac PWRcell	8.6–17.1 kWh	3.4–6.7 kW	Lithium Ion	—	8
Qcells Q.HOME CORE Ax.xBx.x US.1	13.1 kWh	7.84 kW	Lithium Ion	—	4

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

How much energy does the FranklinWH aPower Xyyy store?

15 kWh nameplate, per the California Energy Commission list.

Is the aPower Xyyy UL 9540 certified?

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

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).