Fortress Power MINI-40-90-xx-208

Name: Fortress Power MINI-40-90-xx-208
Brand: Fortress Power

81–266 kWh · 40 kW · Lithium Iron Phosphate · direct PV input · 11 configurations

UL 9540UL 1741 SBCEC listed · Feb 21, 2024

Overview

CEC Energy Storage System List

MINI-40-90-xx-208: 81–266 kWh nameplate energy; 40 kW continuous; lithium iron phosphate; accepts solar panels directly (DC-coupled).

CEC Energy Storage System List · 11 listings

Model	Energy	Power	Grid voltage	Round trip	CEC listed
MINI-40-90-81-208	81 kWh	40 kW	208 V	80%	Feb 21, 2024
MINI-40-90-102-208	102 kWh	40 kW	208 V	80%	Feb 21, 2024
MINI-40-90-112-208	112 kWh	40 kW	208 V	80%	Feb 21, 2024
MINI-40-90-122-208	122 kWh	40 kW	208 V	80%	Feb 21, 2024
MINI-40-90-133-208	133 kWh	40 kW	208 V	80%	Feb 21, 2024
MINI-40-90-163-208	163 kWh	40 kW	208 V	80%	Feb 21, 2024
MINI-40-90-184-208	184 kWh	40 kW	208 V	80%	Feb 21, 2024
MINI-40-90-204-208	204 kWh	40 kW	208 V	80%	Feb 21, 2024
MINI-40-90-225-208	225 kWh	40 kW	208 V	80%	Feb 21, 2024
MINI-40-90-245-208	245 kWh	40 kW	208 V	80%	Feb 21, 2024
MINI-40-90-266-208	266 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-40-90-xx-208 store?

81–266 kWh nameplate, per the California Energy Commission list.

Is the MINI-40-90-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.