DuraRack – Indoor / Outdoor Enclosure

DuraRack | Rugged Protection for Fortress Power Batteries

An all-weather, NEMA 3R-rated enclosure designed for safe, organized indoor or outdoor installations — compatible with Fortress Power’s eFlex batteries.

DuraRack Indoor/Outdoor Enclosure

Expandable Storage for your eFlex Batteries

Expand your energy storage with the Fortress Power DuraRack. This iron enclosure stores up to 4 eFlex 5.4kWh batteries, and is expandable up to 4 units (15 eFlex batteries, 81KWh). The DuraRack includes integrated busbars and a DIN rail heater mount. This enclosure can be free-standing or pad mounted and is safe for indoor and outdoor installations.

Applications

Residential

Commercial + Industrial

FEATURES

Indoor/Outdoor Rated Protection

Built to handle the elements, the DuraRack enclosure is IP65-rated for water and dust resistance — perfect for both indoor utility rooms and exposed outdoor environments.
Integrated Busbars & Cables

Pre-wired with built-in busbars and battery cables, the DuraRack simplifies installation and makes stacking multiple batteries faster and more organized.
Thermostat-Ready for Cold Climates

Easily add a DIN rail-mounted thermostat to activate heating in low temperatures — ideal for cold-weather installations that demand year-round reliability.

Passive Cooling for Hot Climates

Designed with vented airflow to promote natural passive cooling, helping maintain optimal battery performance in warm environments.
Scalable Storage Capacity

Each DuraRack stores up to 4 eFlex 5.4kWh batteries, and is expandable up to 4 units (15 eFlex batteries, 81KWh)
Secure, Professional Appearance

The DuraRack combines durability with a clean, tamper-resistant design — providing a secure, polished solution for residential and commercial projects alike.

PRODUCT INFORMATION

Specifications
Downloads

DuraRack Specifications
Enclosure Material	Carbon Steel
Enclosure Protection	IP65 water and dust proven (outdoor)
Enclosure Color	White
Dimensions [W x H x D]	29.29 x 41.34 x 18.03 in (744 x 1050 x 458 mm)
Enclosure Weight	59.6 kg / 153.2 lbs
Maximum Battery Units	4 eFlex 5.4
Storage Capacity Range	5.4kWh – 21.6 kWh per unit
Max. Storage Capacity	81 kWh (4 unites in parallel)
Knockout Size	1 inch & 2 inch
Positive and Negative Battery Busbars	2 x 4 points; M8 (5/16) Terminal Rings
Positive and Negative Busbars to Inveter	2 points; m10 (3/8) Terminal Rings
Battery Cables	4 sets of
Terminal Torque	7.0 – 7.7 Nm (5.1 – 5.7 ft-lb)
Enclosure Warranty	3 Years
Certifications	UL9540, UL9540A, UL1973, CEC, SGIP

DuraRack | Rugged Protection for Fortress Power Batteries