Description
The Fortress Power DuraRack is a heavy-duty, IP65-rated carbon steel battery enclosure engineered to house up to four eFlex or eFlex MAX 5.4kWh batteries in a single rack, delivering a clean, safe, and fully certified indoor or outdoor energy storage installation with integrated busbars and all battery cables included.
Key Features:
- Holds Up to 4 eFlex or eFlex MAX Units — 5.4kWh to 21.6kWh Per Rack: Accommodates up to four battery units in a single compact enclosure, maximizing storage density while keeping the installation clean, organized, and fully protected.
- Expandable Up to 7 Units in Parallel — Maximum 151.2kWh Total Capacity: Stack up to 7 DuraRack units in parallel for a massive 151.2kWh system, making it equally capable for residential solar storage and 48V UPS server rack applications.
- IP65 Carbon Steel Enclosure Rated for Indoor and Outdoor Installations: Built from heavy-duty carbon steel with IP65 water and dust protection, the DuraRack is engineered to perform reliably in the most demanding environments, indoors or fully exposed outdoors.
- Integrated Busbars and 4 Sets of Anderson Connector Battery Cables Included: Factory-installed busbars with M8 and M10 terminal rings and four complete sets of positive and negative #4 battery cables with Anderson connectors ship in the box for a fast, clean installation.
- DIN Rail Heater Mount and Passive Cooling Vent Ready: Built-in DIN rail mount accommodates optional DIN rail thermostats for cold climate installations, while a passive cooling vent keeps internal temperatures optimized in warm conditions.
The Fortress Power DuraRack is the definitive battery enclosure for any serious eFlex or eFlex MAX deployment. Its integrated busbar system, pre-installed battery cables with Anderson connectors, and free-standing or pad-mounted flexibility eliminate the need for external enclosures, additional hardware, or complex wiring runs — delivering a faster, cleaner, and more professional installation from start to finish.
Whether building a whole-home solar storage system, a 48V UPS server rack, or a scalable commercial energy storage solution, the DuraRack provides the structural integrity, electrical infrastructure, and environmental protection needed to support high-capacity battery installations with confidence. Its carbon steel construction and IP65 rating ensure the batteries inside remain safe, dry, and performing at their peak regardless of where the system is installed.
Certified to UL9540, UL9540A, and UL1973, and listed with CEC and SGIP, the DuraRack is one of the most comprehensively certified battery enclosures available for eFlex and eFlex MAX installations. Backed by a 3-year warranty, it is the trusted enclosure solution for installers and homeowners who demand certified, professional-grade battery housing that is built to last.
Technical Specifications
| Specification | DuraRack |
|---|---|
| GENERAL | |
| Enclosure Material | Carbon Steel |
| Enclosure Color | White with Black |
| Enclosure Protection | IP65 — Water and Dust Proof |
| Dimensions (W x H x D) | 29.88 x 41.97 x 17.83 in |
| Weight | 153.2 lbs |
| Maximum Batteries Per Unit | 4 eFlex or 4 eFlex MAX |
| Storage Capacity Per Unit | 5.4kWh – 21.6kWh |
| Max. Total Storage Capacity | 151.2kWh (7 Units in Parallel) |
| Mounting Options | Free-Standing, Pad-Mounted |
| Application | Indoor and Outdoor |
| Cooling | Passive Cooling Vent |
| DIN Rail Heater Mount | Included |
| Warranty | 3 Years |
| ELECTRICAL | |
| Positive and Negative Battery Busbars | 2 x 4 Points — M8 (5/16 in) Terminal Rings |
| Positive and Negative Busbars to Inverter | 2 Points — M10 (3/8 in) Terminal Rings |
| Battery Cables | 4 Sets of + and - #4 Battery Cables with Anderson Connectors |
| Terminal Torque | 7.0–7.7 Nm (5.1–5.7 ft-lb) |
| KNOCKOUTS | |
| Left Knockout | 2 in (x1) |
| Right Knockout | 2 in (x1) |
| CERTIFICATIONS | |
| Safety Standards | UL9540, UL9540A, UL1973 |
| Listings | CEC, SGIP |
Specs & Info