Fortress Power MINI-40-xx-xx-208

Name: Fortress Power MINI-40-xx-xx-208
Brand: Fortress Power

92–133 kWh · 40 kW · Lithium Iron Phosphate · direct PV input · 2 configurations

UL 9540UL 1741 SBCEC listed · Feb 21, 2024

Overview

CEC Energy Storage System List

MINI-40-xx-xx-208: 92–133 kWh nameplate energy; 40 kW continuous; lithium iron phosphate; accepts solar panels directly (DC-coupled).

CEC Energy Storage System List · 2 listings

Model	Energy	Power	Grid voltage	Round trip	CEC listed
MINI-40-90-92-208	92 kWh	40 kW	208 V	80%	Feb 21, 2024
MINI-40-135-133-208	133 kWh	40 kW	208 V	80%	Feb 21, 2024

CEC Energy Storage System List

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 MINI-40-xx-xx-208 store?

92–133 kWh nameplate, per the California Energy Commission list.

Is the MINI-40-xx-xx-208 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.