Fortress Power DuraRack Indoor/Outdoor Enclosure for eFlex 5.4kWh Batteries
Expand your solar battery system with the Fortress Power DuraRack — a durable iron enclosure designed to keep your eFlex batteries safe and organized. The DuraRack holds up to 4 eFlex 5.4kWh batteries per unit and can be expanded to fit up to 15 eFlex batteries (81 kWh total) for larger energy storage needs.
It comes with integrated busbars and a DIN rail heater mount for easy setup, and can be installed as a free-standing unit or pad-mounted system. Built for both indoor and outdoor use, the DuraRack is a reliable solution to protect and scale your energy storage.
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
IP65-rated enclosure keeps your batteries safe from water, dust, and weather — perfect for both indoor and outdoor use.
🛜 Integrated Busbars & Cables
Comes with integrated busbars and pre-wired cables, making it easy to connect and expand your battery system.
❄️ Cold-Climate Ready
Supports a DIN rail-mounted thermostat for
optional heating, so your batteries stay reliable even in freezing temperatures.
☀️ Passive Cooling for Hot Climates
Vented airflow provides natural passive cooling, protecting battery performance in hot environments.
⬆️ Scalable Storage Capacity
Holds up to 4 eFlex 5.4kWh batteries per unit and scales up to 15 batteries (81kWh total) for larger energy needs.
🛡️ Secure, Professional Look
Durable, tamper-resistant design ensures a clean, safe, and polished installation for
homes and businesses.
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 |
