Fortress Power Avalon-PRO-5P3-xx.xP2M3

Name: Fortress Power Avalon-PRO-5P3-xx.xP2M3
Brand: Fortress Power

88.2 kWh · 15 kW · Lithium Ion · direct PV input

UL 9540UL 1741 SBCEC listed · Mar 1, 2024

Overview

CEC Energy Storage System List

Avalon-PRO-5P3-xx.xP2M3: 88.2 kWh nameplate energy; 15 kW continuous; lithium ion; accepts solar panels directly (DC-coupled).

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

How much energy does the Fortress Power Avalon-PRO-5P3-xx.xP2M3 store?

88.2 kWh nameplate, per the California Energy Commission list.

Is the Avalon-PRO-5P3-xx.xP2M3 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).