Fortress Power DuraRack Indoor/Outdoor Enclosure for eFlex 5.4kWh 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
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Off-grid homes and cabins
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Home backup power
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DIY solar setups
DuraRack Features
Expandable Storage for your eFlex Batteries
🌦️ 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.
DuraRack Technical Specs & Downloads
Get the details you need—spec sheets, manuals, and performance data all in one place. We link directly to the manufacturer's site, so you know you always have the most up-to-date information.
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DuraRack Specifications
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| 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 |
